The FlexGrid control provides a powerful and flexible way to display and edit data in a tabular format.
The FlexGrid control is a full-featured grid, providing all the features you are used to including several selection modes, sorting, column reordering, grouping, filtering, editing, custom cells, XAML-style star-sizing columns, row and column virtualization, etc.
The FlexGrid control supports the following keyboard commands:
| Key Combination | Action |
|---|---|
| Shift + Space | Select row |
| Control + Space | Select column |
| F2 | Start editing the current cell |
| F4 | Open or close the current cell's editor (if available) |
| Space | Start editing or toggle checkbox |
| Control + A | Select the entire grid contents |
| Left/Right | Select the cell to the left/right of the selection, collapse/expand group rows |
| Shift + Left/Right | Extend the selection to include the next cell to the left/right of the selection |
| Up/Down | Select the next cell above or below the selection |
| Shift + Up/Down | Extend the selection to include the cell above or below the selection |
| Alt + Up/Down | Open or close the current cell's editor (if available) |
| PageUp/Down | Select the cell one page above or below the selection |
| Shift + PageUp/Down | Extend the selection to include the cell one page above or below the selection |
| Alt + PageUp/Down | Move the selection to the first or last row |
| Shift + Alt + PageUp/Down | Extend the selection to include the first or last row |
| Home/End | Move the selection to the first or last column |
| Shift + Home/End | Extend the selection to include the first or last column |
| Ctrl + Home/End | Move the selection to the first/last row and column |
| Shift + Ctrl + Home/End | Extend the selection to include the first/last row and column |
| Escape | Cancel current cell or row editing operation |
| Tab | Move the selection to the next focusable element on the page (by default, can be overridden using the keyActionTab property) |
| Enter | Exit editing mode and move the selection to the cell below the current one (by default, can be overridden using the keyActionEnter property) |
| Delete, Backspace | Delete the currently selected rows (if the allowDelete property is set to true), or clear the content of the selected cells (if the values are not required). |
| Control + C or Control + Insert | Copy the selection to the clipboard (if the autoClipboard property is set to true) |
| Control + V or Shift + Insert | Paste the content of the clipboard into the selected area (if the autoClipboard property is set to true) |
{@sample Grid/Overview/purejs Example}
constructor(element: any, options?: any): FlexGrid
Initializes a new instance of the FlexGrid class.
The DOM element that hosts the control, or a CSS selector for the host element (e.g. '#theCtrl').
JavaScript object containing initialization data for the control.
Gets the **HTMLElement** that represents the currently active cell element.
If no cell is currently selected, or if the selected cell is not currently within view, this property returns null.
Gets the **HTMLInputElement** that represents the currently active cell editor.
If no cell is currently being edited, this property returns null.
Gets or sets a value that indicates whether the grid should provide a new row template so users can add items to the source collection.
The new row template will not be displayed if the isReadOnly property is set to true.
The default value for this property is **false**.
Gets or sets a value that indicates whether the grid should delete selected rows when the user presses the Delete key.
Selected rows will not be deleted if the isReadOnly property is set to true.
The default value for this property is **false**.
Gets or sets a value that determines whether users are allowed to drag rows and/or columns with the mouse.
If the autoScroll property is set to true, the grid will automatically scroll its contents while the user drags rows or columns into new positions.
The grid allows dragging columns by default.
Dragging rows requires special considerations in bound scenarios.
When you drag rows on bound grids, the rows will get out of sync with the data source (row 4 may refer to item 6 for example). To avoid this, you should handle the draggedRow event and synchronize the data with the new row positions.
Also, remember to set the allowSorting property to false or you the row order will be determined by the data, and dragging rows will be pointless.
This fiddle demonstrates row dragging with a bound grid: Bound Row Dragging.
The default value for this property is **AllowDragging.Columns** for the FlexGrid control and **AllowDragging.None** for the **PivotGrid** control.
This property does not apply to the **MultiRow** control.
Gets or sets which parts of the grid provide cell merging.
The default value for this property is **AllowMerging.None** for the FlexGrid control and **AllowMerging.All** for the **PivotGrid** control.
This property does not apply to the **MultiRow** control.
Gets or sets a value that determines whether the grid should add pin buttons to the column headers and how the pin buttons behave.
The pin buttons allow users to pin (freeze) columns so they remain in view as the user scrolls the grid horizontally.
The default value for this property is **AllowPinning.None**.
Gets or sets a value that determines whether users may resize rows and/or columns with the mouse.
If resizing is enabled, users can resize columns by dragging the right edge of column header cells, or rows by dragging the bottom edge of row header cells.
Users may also double-click the edge of the header cells to automatically resize rows and columns to fit their content. The auto-size behavior can be customized using the autoSizeMode property.
The default value for this property is **AllowResizing.Columns**.
Gets or sets a value that determines whether users are allowed to sort columns by clicking the column header cells.
The default value for this property is **AllowSorting.SingleColumn**.
Gets or sets a value that determines the number of regular rows between 'alternating' rows.
The default value for this property is **1** for the FlexGrid. Set it to zero to disable alternating rows, or to a number greater than one to insert multiple regular rows between alternating rows.
The default value for this property is **1** for the FlexGrid control and **0** for the **PivotGrid** control.
Gets or sets a value that determines whether extending selections with the mouse or keyboard should change the start (cursor) or the end of the current selection.
The default value for this property is **false**, which causes the grid to move the cursor and keep the selection end anchored.
Setting this property to **true** causes the grid to move the selection end and keep the cursor anchored. This is Excel's behavior.
Gets or sets a value that determines whether the grid should handle clipboard shortcuts.
The clipboard shortcuts are as follows:
Only visible rows and columns are included in clipboard operations.
Read-only cells are not affected by paste operations.
The default value for this property is **true**.
Gets or sets a value that determines whether the grid should generate columns automatically based on the itemsSource.
The column generation depends on the itemsSource property containing at least one item. This data item is inspected and a column is created and bound to each property that contains a primitive value (number, string, Boolean, or Date).
Properties set to null do not generate columns, because the grid would have no way of guessing the appropriate type. In this type of scenario, you should set the autoGenerateColumns property to false and create the columns explicitly. For example:
import { FlexGrid } from '@mescius/wijmo.grid';
let grid = new FlexGrid('#theGrid', {
autoGenerateColumns: false, // data items may contain null values
columns: [ // so define columns explicitly
{ binding: 'name', header: 'Name', dataType: 'String' },
{ binding: 'amount', header: 'Amount', dataType: 'Number' },
{ binding: 'date', header: 'Date', dataType: 'Date' },
{ binding: 'active', header: 'Active', dataType: 'Boolean' }
],
itemsSource: customers
});
The default value for this property is **true** for the FlexGrid control and **false** for the **PivotGrid** control.
Gets or sets a value that determines whether the grid should automatically resize the rows when the data or grid layout change.
This property is especially useful when the grid has columns configured to word-wrap their content (see wordWrap), and when the grid has a relatively small number of rows (auto-sizing is an expensive operation).
The default value for this property is **false**.
Gets or sets a value that determines whether the grid should automatically scroll its contents while users drag rows or columns into new positions.
Row and column dragging are controlled by the allowDragging property.
The default value for this property is **true**.
Gets or sets a value that determines whether the grid should search for cells as the users types into read-only cells.
The search happens on the column that is currently selected, if it is not editable. The search starts at the currently selected row and is case-insensitive.
See also the caseSensitiveSearch property.
The default value for this property is **false**.
Gets or sets which cells should be taken into account when auto-sizing a row or column.
This property controls what happens when users double-click the edge of a column header.
By default, the grid will automatically set the column width based on the content of the header and data cells in the column. This property allows you to change that to include only the headers or only the data.
The default value for this property is **AutoSizeMode.Both**.
Gets or sets a value that determines whether the checkboxes used to edit boolean columns should extend to cover the whole cell width.
Big checkboxes are easier to toggle with the mouse, since the user may click anywhere in the cell to toggle them.
The default value for this property is **false**.
Gets the GridPanel that contains the bottom left cells.
The bottomLeftCells panel appears below the row headers, to the left of the columnFooters panel.
Gets or sets a value that determines whether searches performed while the user types should case-sensitive.
The searches include searching for regular text (see the autoSearch property) as well as searching for items while editing data-mapped cells (see the dataMap property).
The default value for this property is **false** (searches are not case-sensitive by default).
Gets or sets the CellFactory that creates and updates cells for this grid.
Gets or sets the name of the property (or properties) used to generate child rows in hierarchical grids.
Set this property to a string to specify the name of the property that contains an item's child items (e.g. childItemsPath = 'items';).
If items at different levels have child items with different names, set this property to an array containing the names of the properties that contain child items et each level (e.g. childItemsPath = ['checks','earnings'];).
{@sample Grid/TreeGrid/ChildItems/purejs Example}
The default value for this property is **null**.
This property does not apply to the **MultiRow** control.
Gets the client size of the control (control size minus headers and scrollbars).
Gets or sets a value that determines whether the FlexGrid should clone frozen cells and show then in a separate element to reduce flicker while scrolling.
The default value for this property is **null**, which causes the grid to select the best setting depending on the browser.
Gets the ICollectionView that contains the grid data.
If the itemsSource property was set to an ICollectionView, this property returns that value.
If the itemsSource property was set to an array of data items, this property returns the internal CollectionView created by the grid to support currency, editing, and sorting.
Gets or sets an array used to define hierarchical column groups.
The items in the array should be JSON objects with properties of Column objects, plus three optional members:
* 'columns' array containing an array of child columns, * 'collapseTo' string containing the binding(s) of the child column(s) that should remain visible when the group is collapsed. * 'isCollapsed' boolean that determines if the group should be initially collapsed.
For example, the code below generates a grid with two column groups, both initially collapsed:
new FlexGrid('#theGrid', {
autoGenerateColumns: false,
columnGroups: [
{ header: 'Group 1', align: 'center', collapseTo: ['id', 'country'], isCollapsed: true, columns: [
{ binding: 'id', header: 'ID' },
{ binding: 'date', header: 'Date', dataType: 'Date' },
{ binding: 'country', header: 'Country', dataType: 'String' },
{ binding: 'active', header: 'Active', dataType: 'Boolean' },
]},
{ header: 'Group 2', align: 'center', collapseTo: 'sales', isCollapsed: true, columns: [
{ binding: 'sales', header: 'Sales', dataType: 'Number' },
{ binding: 'expenses', header: 'Expenses', dataType: 'Number' },
]}
],
itemsSource: getData(20)
});
Gets or sets a JSON string that defines the current column layout.
The column layout string represents an array with the columns and their properties. It can be used to persist column layouts defined by users so they are preserved across sessions, and can also be used to implement undo/redo functionality in applications that allow users to modify the column layout.
The column layout string does not include properties that cannot be converted to JSON, such as dataMap and editor.
If you want to save and restore column layouts and don't require the layouts to be serializable, you can clone the content of the columns property and restore it later using array methods. This is not as convenient as using the columnLayout property, but it does allow you to save and restore data maps and editors.
Gets or sets a value that indicates how the grid commit empty edits to cell values.
The default value for this property is **true**.
If you choose to ignore commit empty edits, the Grid will not commit empty edits to cell values if the original value is null.
Gets or sets the template used to instantiate FlexGrid controls.
Gets or sets a value that determines whether the grid should include the content of header cells when copying data to the clipboard.
This property is especially useful in read-only grids, because the header information typically should not be included when pasting data into the grid.
The default value for this property is **HeadersVisibility.None** for the FlexGrid control and **HeadersVisibility.All** for the **PivotGrid** control.
Gets a reference to a static object that defines the default width for auto-generated grid columns based on their types.
The object keys are DataType values. The object values are either numbers (widths in pixels) or star-size strings (multiples of the default width defined by the columns defaultSize property).
For example:
import { FlexGrid } from '@mescius/wijmo.grid';
import { DataType } from '@mescius/wijmo';
// make boolean columns on all grids 100px wide by default
FlexGrid.defaultTypeWidth[DataType.Boolean] = 100;
// make numeric columns on all grids 75% as wide as the columns defaultSize
FlexGrid.defaultTypeWidth[DataType.Number] = '0.75*';
Gets or sets a value that determines whether row and column resizing should be deferred until the user releases the mouse button.
By default, deferResizing is set to false, causing rows and columns to be resized as the user drags the mouse. Setting this property to true causes the grid to show a resizing marker and to resize the row or column only when the user releases the mouse button.
The default value for this property is **false** for the FlexGrid control and **true** for the **PivotGrid** control.
Gets the IEditableCollectionView that contains the grid data.
Gets or sets the index of column in the row header panel that shows whether items are being edited.
The default value for this property is **null**, which causes the grid to show the edit glyph on the last column of the rowHeaders panel.
Gets or sets the Tooltip object used to show validation errors detected by the grid when the showErrors property is set to true.
By default, this property is set to a tooltip with zero show delay (so it appears immediately when hovering over invalid cells), no HTML content, and a "wj-error-tip" class which can be used to customize the tooltip's appearance.
Setting this property to **null** causes the control to use the cell's "title" attribute to show validation errors.
Gets or sets a value that determines whether the grid should automatically expand the selection to include cells in merged ranges when copying or pasting content to/from the clipboard.
The default value for this property is **true**.
Gets or sets the number of frozen columns.
Frozen columns do not scroll horizontally, but the cells they contain may be selected and edited.
The default value for this property is **0**.
Gets or sets the number of frozen rows.
Frozen rows do not scroll vertically, but the cells they contain may be selected and edited.
The default value for this property is **0**.
Gets or sets the format string used to create the group header content.
The string may contain any text, plus the following replacement strings:
If a column is bound to the grouping property, the column header is used to replace the {name} parameter, and the column's format and data maps are used to calculate the {value} parameter. If no column is available, the group information is used instead.
You may add invisible columns bound to the group properties in order to customize the formatting of the group header cells.
The default value for this property is **null**, which causes the grid to use a culture-specific version of the string
'{name}: <b>{value}</b>({count:n0} items)'
This default format string creates group headers similar to
'Country: <b>UK</b> (12 items)' 'Country: <b>Japan</b> (8 items)'
Gets or sets a value that determines the position of group summary row in the group. This property does not work if childItemsPath property is set
The default value for this property is **GroupSummaryPosition.Top**.
Gets or sets a value that determines whether the row and column headers are focusable.
The default value for this property is **HeadersFocusability.None**.
Gets or sets a value that determines whether the row and column headers are visible.
The default value for this property is **HeadersVisibility.All**.
Gets the DOM element that is hosting the control.
Gets or sets a value that determines whether the grid should support Input Method Editors (IME) while not in edit mode.
This property is relevant only for sites/applications in Japanese, Chinese, Korean, and other languages that require IME support.
The default value for this property is **false**.
Gets or sets a value that determines whether the control is disabled.
Disabled controls cannot get mouse or keyboard events.
Gets or sets a value that determines whether the user can modify cell values using the mouse and keyboard.
The default value for this property is **false** for the FlexGrid control and **true** for the **PivotGrid** control.
Gets a value that indicates whether the control is currently handling a touch event.
Gets a value that indicates whether the control is currently being updated.
Gets or sets a formatter function used to customize cells on this grid.
The formatter function can add any content to any cell. It provides complete flexibility over the appearance and behavior of grid cells.
If specified, the function should take four parameters: the GridPanel that contains the cell, the row and column indices of the cell, and the HTML element that represents the cell. The function will typically change the **innerHTML** property of the cell element.
For example:
flex.itemFormatter = (panel, r, c, cell) => {
if (panel.cellType == CellType.Cell) {
// draw sparklines in the cell
let col = panel.columns[c];
if (col.name == 'sparklines') {
cell.innerHTML = getSparkline(panel, r, c);
}
}
}
Note that the FlexGrid recycles cells, so if your itemFormatter modifies the cell's style attributes, you must make sure that it resets these attributes for cells that should not have them. For example:
flex.itemFormatter = (panel, r, c, cell) => {
// reset attributes we are about to customize
let s = cell.style;
s.color = '';
s.backgroundColor = '';
// customize color and backgroundColor attributes for this cell
...
}
If you have a scenario where multiple clients may want to customize the grid rendering (for example when creating directives or re-usable libraries), consider using the formatItem event instead. The event allows multiple clients to attach their own handlers.
Gets or sets the array or ICollectionView that contains items shown on the grid.
Gets or sets a validator function to determine whether cells contain valid data.
If specified, the validator function should take parameters containing the cell's row and column indices and a parsing parameter that describes whether the data has already been parsed and applied to the data item (parsing == false), or whether the user was trying to edit the value and entered a value that could not be parsed into the data type expected (parsing == true).
The method returns a string containing an error message, or null if no errors were detected.
For example,
grid.itemValidator = (row: number, col: number, parsing: boolean) => {
let item = grid.rows[row].dataItem,
prop = grid.columns[col].binding;
// parsing failed, show message
if (parsing) {
if (prop == 'date') {
return 'Please enter a valid date in the format "MM/dd/yyyy"';
} else if (prop == 'id') {
return 'Please enter a positive number';
}
}
// check that stored (parsed) data is valid
if (prop == 'date' && item.date < minDate) {
return 'Please enter a date after ' + Globalize.formatDate(minDate, 'd');
} else if (prop == 'id' && item.id < 0) {
return 'Please enter a positive number';
}
});
See also the getError method.
Gets or sets the action to perform when the ENTER key is pressed.
The default setting for this property is MoveDown, which causes the control to move the selection to the next row. This is the standard Excel behavior.
Gets or sets the action to perform when the TAB key is pressed.
The default setting for this property is None, which causes the browser to select the next or previous controls on the page when the TAB key is pressed. This is the recommended setting to improve page accessibility.
Note that the default setting for the inherited FlexSheet control is CycleOut (see below).
In previous versions, the default was set to Cycle, which caused the control to move the selection across and down the grid. This is the standard Excel behavior, but is not good for accessibility.
There is also a CycleOut setting that causes the selection to move through the cells (as Cycle), and then on to the next/previous control on the page when the last or first cells are selected.
Gets or sets a value that determines whether the grid should skip rendering cells that were updated in the last render cycle.
The default value for this property is **true**.
Gets or sets a value that determines whether the grid should adjust its size to fit the maximum content width and available height.
The default value for this property is **false**.
Gets or sets the MergeManager object responsible for determining how cells should be merged.
Gets or sets a value that indicates whether the new row template should be located at the top of the grid or at the bottom.
If you set the newRowAtTop property to true, and you want the new row template to remain visible at all times, set the frozenRows property to one. This will freeze the new row template at the top so it won't scroll off the view.
The new row template will be displayed only if the allowAddNew property is set to true and if the itemsSource object supports adding new items.
The default value for this property is **false**.
Gets or sets a value that determines whether when pasting, paste all cells or only not empty cells The default value for this property is **true**.
Gets or sets a value that determines whether the grid should preserve the expanded/collapsed state of nodes when the data is refreshed.
The preserveOutlineState property implementation is based on JavaScript's Map object, which is not available in IE 9 or 10.
The default value for this property is **true**.
Gets or sets a value that determines whether the grid should preserve the selected state of rows when the data is refreshed.
The default value for this property is **true**.
Gets or sets a value that determines whether the grid should keep whitespace in cells as they appear in the data (white-space: pre) or whether it should collapse the whitespace into a single space character (white-space: normal).
This property allows you to specify how the grid should handle white space without changing any CSS rules. You choose to use CSS rules instead, however, since they provide better control over scope.
For example, you could create CSS rules that apply to all grids in the application, to specific grids, or to specific columns.
Be aware that setting this property to **true** may have undesired effects in applications that use interop cell templates (Vue templates especially).
The default value for this property is **false**.
Gets or sets a value that determines whether the grid should optimize performance over precision when auto-sizing columns.
Setting this property to **false** disables quick auto-sizing. Setting it to **true** enables the feature, subject to the value of each column's quickAutoSize property.
The default value for this property is **null**, which enables quick auto-sizing for grids that don't have a custom itemFormatter or handlers attached to the formatItem event.
Quick auto-sizing uses different strategies when auto-sizing rows or columns.
When auto-sizing columns, it uses a temporary canvas element to locate the row with the widest entry for a column. When the row is located, its contents are measured precisely. The limitation with this approach is that the canvas only renders plain text, so if cells contain HTML the auto-sizing may miss the widest column.
When auto-sizing rows, it uses a cache to store the row heights based on the cell content, and skips measuring numeric cells. The limitation with this approach is that it only improves performance if many cells have the same content, or if many columns are numeric.
If you find that auto-sizing is slowing down your application, it is probably worth setting quickAutoSize to true and checking the results to see if it works correctly and improves performance for your app.
Gets or sets a value that determines whether the grid should refresh all cells after a cell is edited.
The default value for this property is **true**.
Gets a value indicating whether the control is hosted in an element with right-to-left layout.
Gets or sets the name of the property used to create row header cells.
Row header cells are not visible or selectable. They are meant for use with accessibility tools.
Gets or sets an array containing the data items that are currently selected.
Note: this property can be read in all selection modes, but it can be set only when selectionMode is set to **SelectionMode.ListBox**.
Gets or sets an array with CellRange objects that represent the current selection.
The first element in the array is the current selection. If the grid's selectionMode property is set to MultiRange, the array may contain additional ranges that represent the extended selection.
Note that ranges in the selectedRanges array may contain overlapping areas, which may be important when performing actions like aggregating over the extended selection.
Gets or sets an array containing the rows that are currently selected.
Note: this property can be read in all selection modes, but it can be set only when selectionMode is set to **SelectionMode.ListBox**.
Gets or sets a value that indicates whether the grid should add drop-down buttons to data-mapped cells.
The drop-down buttons are shown on columns that have a dataMap and are editable.
Clicking on the drop-down buttons causes the grid to show a drop-down list from which users can select the cell value.
This setting may be overridden on specific columns using the column's dataMapEditor property.
Cell drop-downs require the **wijmo.input module** to be loaded.
Gets or sets a value that determines whether the grid should add the 'wj-state-invalid' class to cells that contain validation errors and tooltips with error descriptions.
The grid detects validation errors using the itemValidator property and the getError property on the grid's itemsSource.
The default value for this property is **true**.
Gets or sets a value that determines whether the FlexGrid should insert group rows to delimit data groups.
Data groups are created by modifying the groupDescriptions property of the ICollectionView object used as an itemsSource.
The default value for this property is **true**.
Gets or sets a value that indicates whether the grid should display an Excel-style marquee around the current selection.
The default value for this property is **false**.
If you choose to show the marquee, you may want to improve accessibility by using some simple CSS to make the marquee fully opaque only when the grid has the focus:
```css .wj-flexgrid:not(.wj-state-focused) .wj-marquee { opacity: 0.2; } ```
Gets or sets a value that determines whether the grid should use the column headers as placeholders when editing cells.
The default value for this property is **false**.
This property is especially useful in grids that have multiple rows per data item (like the MultiRow grid) and in grids that allow adding new items (see the allowAddNew property).
This property only works with the grid's built-in editor. If you are using custom editors (see the editor property), then you are responsible for setting the placeholder property on those.
The Internet Explorer browser does not show input placeholders on focused input elements, so this property is not useful in IE.
Gets or sets a value that indicates whether the grid should add class names to indicate selected header cells.
The default value for this property is **HeadersVisibility.None**.
Gets or sets a value that determines whether the grid should display sort indicators in the column headers.
Sorting is controlled by the sortDescriptions property of the ICollectionView object used as a the grid's itemsSource.
The default value for this property is **true**.
Gets or sets a value that determines whether when copying, skip cells that have been merged The default value for this property is **false**.
Gets or sets the index of row in the column header panel that shows and changes the current sort.
The default value for this property is **null**, which causes the bottom row in the columnHeaders panel to act as the sort row.
Gets or sets a value that determines whether column headers should remain visible when the user scrolls the document.
The default value for this property is **false**.
Gets or sets a value of the **tabindex** attribute associated with the control.
**tabindex** attribute value can be defined statically for a Wijmo control by specifying it on the control's host HTML element. But this value can't be changed later during application lifecycle, because Wijmo controls have complex structure, and the control may need to propagate this attribute value to its internal element to work properly.
Because of this, to read or change control's **tabindex** dynamically, you should do it using this property.
Gets the GridPanel that contains the top left cells (to the left of the column headers).
Gets or sets the indent used to offset row groups of different levels.
The default value for this property is **14** pixels for the FlexGrid control, and **32** pixels for the **PivotGrid**.
Gets or sets a value that determines whether the grid should remain in edit mode when the user tries to commit edits that fail validation.
The grid detects validation errors by calling the getError method on the grid's itemsSource.
The default value for this property is **true**.
Gets or sets the minimum number of rows and/or columns required to enable virtualization.
This property is set to zero by default, meaning virtualization is always enabled. This improves binding performance and memory requirements, at the expense of a small performance decrease while scrolling.
If your grid has a small number of rows (about 50 to 100), you may be able to improve scrolling performance by setting this property to a slightly higher value (like 150). This will disable virtualization and will slow down binding, but may improve perceived scroll performance. For example, the code below sets causes the grid to virtualize cells when the data source has more than 150 items:
// virtualize grid when there are more than 150 items theGrid.virtualizationThreshold = 150;
Setting this property to values higher than 200 is not recommended. Loading times will become too long; the grid will freeze for a few seconds while creating cells for all rows, and the browser will become slow because of the large number of elements on the page.
If you want to set separate virtualization thresholds for rows and columns, you may set the virtualizationThreshold property to an array with two numbers. In this case, the first number will be used as the row threshold and the second as the column threshold. For example, the code below sets causes the grid to virtualize rows but not columns:
// virtualize rows (threshold 0) but not columns (threshold 10,000) theGrid.virtualizationThreshold = [0, 10000];
The default value for this property is **0**, which causes the grid to virtualize all rows and columns.
addEventListener(target: EventTarget, type: string, fn: any, capture?: boolean, passive?: boolean): void
Adds an event listener to an element owned by this Control.
The control keeps a list of attached listeners and their handlers, making it easier to remove them when the control is disposed (see the dispose and removeEventListener methods).
Failing to remove event listeners may cause memory leaks.
The passive parameter is set to false by default, which means the event handler may call event.preventDefault(). If you are adding passive handlers to touch or wheel events, setting this parameter to true will improve application performance.
For details on passive event listeners, please see Improving scrolling performance with passive listeners.
Target element for the event.
String that specifies the event.
Function to execute when the event occurs.
Whether the listener should be handled by the control before it is handled by the target element.
Indicates that the handler will never call preventDefault().
adjustFrozenRowColSize(index: number, type: FrozenRowCol, delta?: number): void
Adjusts the size of a column/row ensuring the total size of frozen elements does not exceed the grid size.
applyTemplate(classNames: string, template: string, parts: Object, namePart?: string): HTMLElement
Applies the template to a new instance of a control, and returns the root element.
This method should be called by constructors of templated controls. Therefore, this method is not available. It is responsible for binding the template parts to the corresponding control members.
For example, the code below applies a template to an instance of an InputNumber control. The template must contain elements with the 'wj-part' attribute set to 'input', 'btn-inc', and 'btn-dec'. The control members '_tbx', '_btnUp', and '_btnDn' will be assigned references to these elements.
this.applyTemplate('wj-control wj-inputnumber', templateString, {
_tbx: 'input',
_btnUp: 'btn-inc',
_btnDn: 'btn-dec'
}, 'input');
```
Names of classes to add to the control's host element.
An HTML string that defines the control template.
A dictionary of part variables and their names.
Name of the part to be named after the host element. This determines how the control submits data when used in forms.
autoSizeColumn(c: number, header?: boolean, extra?: number): void
Resizes a column to fit its content.
This method only works if the grid is visible. If its host element has not been added to the DOM, or if any of the grid's ancestor elements is hidden, the grid will not be able to measure the cells and therefore will not be able to auto-size the columns.
Index of the column to resize.
Whether the column index refers to a regular or a header row.
Extra spacing, in pixels.
autoSizeColumns(firstColumn?: number, lastColumn?: number, header?: boolean, extra?: number): void
Resizes a range of columns to fit their content.
The grid will always measure all rows in the current view range, plus up to 2,000 rows not currently in view. If the grid contains a large amount of data (say 50,000 rows), then not all rows will be measured since that could take a long time.
This method only works if the grid is visible. If its host element has not been added to the DOM, or if any of the grid's ancestor elements is hidden, the grid will not be able to measure the cells and therefore will not be able to auto-size the columns.
Index of the first column to resize (defaults to the first column).
Index of the last column to resize (defaults to the last column).
Whether the column indices refer to regular or header columns.
Extra spacing, in pixels.
autoSizeRow(r: number, header?: boolean, extra?: number): void
Resizes a row to fit its content.
This method only works if the grid is visible. If its host element has not been added to the DOM, or if any of the grid's ancestor elements are hidden, the grid will not be able to measure the cells and therefore will not be able to auto-size the rows.
Index of the row to resize.
True to indicate the row index refers to a header row, false to indicate it refers to a regular data row, or null to indicate it refers to a footer row.
Extra spacing, in pixels.
autoSizeRows(firstRow?: number, lastRow?: number, header?: boolean, extra?: number): void
Resizes a range of rows to fit their content.
This method only works if the grid is visible. If its host element has not been added to the DOM, or if any of the grid's ancestor elements is hidden, the grid will not be able to measure the cells and therefore will not be able to auto-size the rows.
Index of the first row to resize.
Index of the last row to resize.
Whether the row indices refer to regular or header rows.
Extra spacing, in pixels.
beginUpdate(): void
Suspends notifications until the next call to endUpdate.
canEditCell(r: number, c: number): boolean
Gets a value that indicates whether a given cell can be edited.
Index of the row that contains the cell.
Index of the column that contains the cell.
collapseGroupsToLevel(level: number): void
Collapses all the group rows to a given level.
Maximum group level to show.
deferUpdate(fn: Function): void
Executes a function within a beginUpdate/endUpdate block.
The control will not be updated until the function has been executed. This method ensures endUpdate is called even if the function throws an exception.
Function to be executed.
dispose(): void
Disposes of the control by removing its association with the host element.
disposeAll(e?: HTMLElement): void
Disposes of all Wijmo controls contained in an HTML element.
Container element.
endUpdate(): void
Resumes notifications suspended by calls to beginUpdate.
finishEditing(cancel?: boolean): boolean
Commits any pending edits and exits edit mode.
Whether pending edits should be canceled or committed.
focus(force?: boolean): void
Overridden to set the focus to the grid without scrolling the whole grid into view.
Whether to perform the focus operation even if the grid already contains the focus.
getCellBoundingRect(r: number, c: number | string, raw?: boolean): Rect
Gets a the bounds of a cell element in viewport coordinates.
This method returns the bounds of cells in the cells panel (scrollable data cells). To get the bounds of cells in other panels, use the getCellBoundingRect method in the appropriate GridPanel object.
The returned value is a Rect object which contains the position and dimensions of the cell in viewport coordinates. The viewport coordinates are the same used by the getBoundingClientRect method.
Index of the row that contains the cell.
Index, name, or binding of the column that contains the cell.
Whether to return the rectangle in raw panel coordinates as opposed to viewport coordinates.
getCellData(r: number, c: number | string, formatted: boolean): any
Gets the value stored in a cell in the scrollable area of the grid.
Index of the row that contains the cell.
Index, name, or binding of the column that contains the cell.
Whether to format the value for display.
getClipString(rng?: CellRange | null, options?: boolean | ClipStringOptions, colHeaders?: boolean, rowHeaders?: boolean): string
Gets the content of a CellRange as a string suitable for copying to the clipboard or exporting to CSV (comma-separated values) files.
Hidden rows and columns are not included in the clip string.
Invalid (with negative indexes) row or column ranges can be specified in CellRange, which indicates that data rows or columns are not included in the result. In conjunction with **colHeaders** or **rowHeaders** parameters set to true, this makes it possible to export colum or row headers only, without the corresponding data cells.
CellRange to copy. If omitted, the current selection is used.
A boolean value that specifies the clip string should be a CSV string or a ClipStringOptions value that specifies options for the clip string.
Whether to include the column headers.
Whether to include the row headers.
To export the current selection, set the **rng** parameter to null. This will include not only the primary selection but also extended selections such as selected rows (in ListBox mode) and multiple selected ranges (in MultiRange mode).
Note that multiple selected ranges are included only if all selected ranges refer to the same column range or row range.
getColumn(name: string | number, header?: boolean): Column
Gets a column by name or by binding.
The method searches the column by name. If a column with the given name is not found, it searches by binding. The searches are case-sensitive.
The column name, binding, or index.
Whether to include column groups in search.
getColumnGroups(): ColumnGroupCollection
Get the collection of column groups.
getControl(element: any): Control
Gets the control that is hosted in a given DOM element.
The DOM element that hosts the control, or a CSS selector for the host element (e.g. '#theCtrl').
getMergedRange(p: GridPanel, r: number, c: number, clip?: boolean): CellRange
The GridPanel that contains the range.
Index of the row that contains the cell.
Index of the column that contains the cell.
Whether to clip the merged range to the grid's current view range.
getSelectedState(r: number, c: number): SelectedState
Gets a SelectedState value that indicates the selected state of a cell.
getTemplate(): string
Gets the HTML template used to create instances of the control.
This method traverses up the class hierarchy to find the nearest ancestor that specifies a control template. For example, if you specify a prototype for the ComboBox control, which does not specify a template, it will override the template defined by the DropDown base class (the nearest ancestor that does specify a template).
hitTest(pt: Point | MouseEvent | HTMLElement, y?: number | boolean): HitTestInfo
Gets a HitTestInfo object with information about a given point.
For example:
// hit test a point when the user clicks on the grid
flex.hostElement.addEventListener('click', (e) => {
let ht = flex.hitTest(e.pageX, e.pageY);
console.log('you clicked a cell of type "' +
wijmo.grid.CellType[ht.cellType] + '".');
});
Point to investigate, in page coordinates, or a MouseEvent object, or x coordinate of the point.
Y coordinate of the point in page coordinates (if the first parameter is a number).
initialize(options: any): void
Initializes the control by copying the properties from a given object.
This method allows you to initialize controls using plain data objects instead of setting the value of each property in code.
For example:
grid.initialize({
itemsSource: myList,
autoGenerateColumns: false,
columns: [
{ binding: 'id', header: 'Code', width: 130 },
{ binding: 'name', header: 'Name', width: 60 }
]
});
// is equivalent to
grid.itemsSource = myList;
grid.autoGenerateColumns = false;
// etc.
The initialization data is type-checked as it is applied. If the initialization object contains unknown property names or invalid data types, this method will throw.
Object that contains the initialization data.
invalidate(fullUpdate?: boolean): void
Invalidates the control causing an asynchronous refresh.
Whether to update the control layout as well as the content.
invalidateAll(e?: HTMLElement): void
Invalidates all Wijmo controls contained in an HTML element.
Use this method when your application has dynamic panels that change the control's visibility or dimensions. For example, splitters, accordions, and tab controls usually change the visibility of its content elements. In this case, failing to notify the controls contained in the element may cause them to stop working properly.
If this happens, you must handle the appropriate event in the dynamic container and call the invalidateAll method so the contained Wijmo controls will update their layout information properly.
Container element. If set to null, all Wijmo controls on the page will be invalidated.
isRangeValid(rng: CellRange): boolean
Checks whether a given CellRange is valid for this grid's row and column collections.
Range to check.
onAutoSizedColumn(e: CellRangeEventArgs): void
Raises the autoSizedColumn event.
CellRangeEventArgs that contains the event data.
onAutoSizedRow(e: CellRangeEventArgs): void
Raises the autoSizedRow event.
CellRangeEventArgs that contains the event data.
onAutoSizingColumn(e: CellRangeEventArgs): boolean
Raises the autoSizingColumn event.
CellRangeEventArgs that contains the event data.
onAutoSizingRow(e: CellRangeEventArgs): boolean
Raises the autoSizingRow event.
CellRangeEventArgs that contains the event data.
onBeginningEdit(e: CellRangeEventArgs): boolean
Raises the beginningEdit event.
CellRangeEventArgs that contains the event data.
onCellEditEnded(e: CellRangeEventArgs): void
Raises the cellEditEnded event.
CellRangeEventArgs that contains the event data.
onCellEditEnding(e: CellEditEndingEventArgs): boolean
Raises the cellEditEnding event.
CellEditEndingEventArgs that contains the event data.
onColumnGroupCollapsedChanged(e: CellRangeEventArgs): void
Raises the columnGroupCollapsedChanged event.
CellRangeEventArgs that contains the event data.
onColumnGroupCollapsedChanging(e: CellRangeEventArgs): boolean
Raises the columnGroupCollapsedChanging event.
CellRangeEventArgs that contains the event data.
onCopied(e: CellRangeEventArgs): void
Raises the copied event.
CellRangeEventArgs that contains the event data.
onCopying(e: CellRangeEventArgs): boolean
Raises the copying event.
CellRangeEventArgs that contains the event data.
onDeletedRow(e: CellRangeEventArgs): void
Raises the deletedRow event.
CellRangeEventArgs that contains the event data.
onDeletingRow(e: CellRangeEventArgs): boolean
Raises the deletingRow event.
CellRangeEventArgs that contains the event data.
onDraggedColumn(e: CellRangeEventArgs): void
Raises the draggedColumn event.
CellRangeEventArgs that contains the event data.
onDraggedRow(e: CellRangeEventArgs): void
Raises the draggedRow event.
CellRangeEventArgs that contains the event data.
onDraggingColumn(e: CellRangeEventArgs): boolean
Raises the draggingColumn event.
CellRangeEventArgs that contains the event data.
onDraggingColumnOver(e: CellRangeEventArgs): boolean
Raises the draggingColumnOver event.
CellRangeEventArgs that contains the event data.
onDraggingRow(e: CellRangeEventArgs): boolean
Raises the draggingRow event.
CellRangeEventArgs that contains the event data.
onDraggingRowOver(e: CellRangeEventArgs): boolean
Raises the draggingRowOver event.
CellRangeEventArgs that contains the event data.
onFormatItem(e: FormatItemEventArgs): void
Raises the formatItem event.
FormatItemEventArgs that contains the event data.
onGotFocus(e?: EventArgs): void
Raises the gotFocus event.
onGroupCollapsedChanged(e: CellRangeEventArgs): void
Raises the groupCollapsedChanged event.
CellRangeEventArgs that contains the event data.
onGroupCollapsedChanging(e: CellRangeEventArgs): boolean
Raises the groupCollapsedChanging event.
CellRangeEventArgs that contains the event data.
onInvalidInput(e: CancelEventArgs): void
Raises the invalidInput event.
If the event handler cancels the event, the control will keep the invalid input and the focus.
onItemsSourceChanged(e?: EventArgs): void
Raises the itemsSourceChanged event.
onItemsSourceChanging(e: CancelEventArgs): boolean
Raises the itemsSourceChanging event.
CancelEventArgs that contains the event data.
onLoadedRows(e?: EventArgs): void
Raises the loadedRows event.
onLoadingRows(e: CancelEventArgs): boolean
Raises the loadingRows event.
CancelEventArgs that contains the event data.
onLostFocus(e?: EventArgs): void
Raises the lostFocus event.
onPasted(e: CellRangeEventArgs): void
Raises the pasted event.
CellRangeEventArgs that contains the event data.
onPastedCell(e: CellRangeEventArgs): void
Raises the pastedCell event.
CellRangeEventArgs that contains the event data.
onPasting(e: CellRangeEventArgs): boolean
Raises the pasting event.
CellRangeEventArgs that contains the event data.
onPastingCell(e: CellRangeEventArgs): boolean
Raises the pastingCell event.
CellRangeEventArgs that contains the event data.
onPinnedColumn(e: CellRangeEventArgs): void
Raises the pinnedColumn event.
CellRangeEventArgs that contains the event data.
onPinningColumn(e: CellRangeEventArgs): boolean
Raises the pinningColumn event.
CellRangeEventArgs that contains the event data.
onPrepareCellForEdit(e: CellRangeEventArgs): void
Raises the prepareCellForEdit event.
CellRangeEventArgs that contains the event data.
onRefreshed(e?: EventArgs): void
Raises the refreshed event.
onRefreshing(e?: EventArgs): void
Raises the refreshing event.
onResizedColumn(e: CellRangeEventArgs): void
Raises the resizedColumn event.
CellRangeEventArgs that contains the event data.
onResizedRow(e: CellRangeEventArgs): void
Raises the resizedRow event.
CellRangeEventArgs that contains the event data.
onResizingColumn(e: CellRangeEventArgs): boolean
Raises the resizingColumn event.
CellRangeEventArgs that contains the event data.
onResizingRow(e: CellRangeEventArgs): boolean
Raises the resizingRow event.
CellRangeEventArgs that contains the event data.
onRowAdded(e: CellRangeEventArgs): boolean
Raises the rowAdded event.
CellRangeEventArgs that contains the event data.
onRowEditEnded(e: CellRangeEventArgs): void
Raises the rowEditEnded event.
CellRangeEventArgs that contains the event data.
onRowEditEnding(e: CellRangeEventArgs): void
Raises the rowEditEnding event.
CellRangeEventArgs that contains the event data.
onRowEditStarted(e: CellRangeEventArgs): void
Raises the rowEditStarted event.
CellRangeEventArgs that contains the event data.
onRowEditStarting(e: CellRangeEventArgs): void
Raises the rowEditStarting event.
CellRangeEventArgs that contains the event data.
onScrollPositionChanged(e?: EventArgs): void
Raises the scrollPositionChanged event.
onSelectionChanged(e: CellRangeEventArgs): void
Raises the selectionChanged event.
CellRangeEventArgs that contains the event data.
onSelectionChanging(e: CellRangeEventArgs): boolean
Raises the selectionChanging event.
CellRangeEventArgs that contains the event data.
onSortedColumn(e: CellRangeEventArgs): void
Raises the sortedColumn event.
CellRangeEventArgs that contains the event data.
onSortingColumn(e: CellRangeEventArgs): boolean
Raises the sortingColumn event.
CellRangeEventArgs that contains the event data.
onStarSizedColumns(e?: EventArgs): void
Raises the starSizedColumns event.
onUpdatedLayout(e?: EventArgs): void
Raises the updatedLayout event.
onUpdatedView(e?: EventArgs): void
Raises the updatedView event.
onUpdatingLayout(e: CancelEventArgs): boolean
Raises the updatingLayout event.
CancelEventArgs that contains the event data.
onUpdatingView(e: CancelEventArgs): boolean
Raises the updatingView event.
CancelEventArgs that contains the event data.
refresh(fullUpdate?: boolean): void
Refreshes the grid display.
Whether to update the grid layout and content, or just the content.
refreshAll(e?: HTMLElement): void
Refreshes all Wijmo controls contained in an HTML element.
This method is similar to invalidateAll, except the controls are updated immediately rather than after an interval.
Container element. If set to null, all Wijmo controls on the page will be invalidated.
refreshCells(fullUpdate: boolean, recycle?: boolean, state?: boolean): void
Refreshes the grid display.
Whether to update the grid layout and content, or just the content.
Whether to recycle existing elements.
Whether to keep existing elements and update their state.
refreshRange(rng: CellRange): void
Refreshes the cells in a range, updating their content and styles.
Unlike the refreshCells method, which updates all the cells, refreshRange allows you to specify which cells should be refreshed, which in some cases can improve performance.
removeEventListener(target?: EventTarget, type?: string, fn?: any, capture?: boolean): number
Removes one or more event listeners attached to elements owned by this Control.
Target element for the event. If null, removes listeners attached to all targets.
String that specifies the event. If null, removes listeners attached to all events.
Handler to remove. If null, removes all handlers.
Whether the listener is capturing. If null, removes capturing and non-capturing listeners.
scrollIntoView(r: number, c: number | string, refresh?: boolean): boolean
Scrolls the grid to bring a specific cell into view.
Negative row and column indices are ignored, so if you call
grid.scrollIntoView(200, -1);
The grid will scroll vertically to show row 200, and will not scroll horizontally.
Index of the row to scroll into view.
Index, name, or binding of the column to scroll into view.
Optional parameter that determines whether the grid should refresh to show the new scroll position immediately.
select(rng: (CellRange | number), show?: (boolean | number | string), panel?: GridPanel): boolean
Selects a cell range and optionally scrolls it into view.
The select method can be called by passing a CellRange and an optional boolean parameter that indicates whether the new selection should be scrolled into view. For example:
// select cell 1,1 and scroll it into view
grid.select(new CellRange(1, 1), true);
// select range (1,1)-(2,4) and do not scroll it into view
grid.select(new CellRange(1, 1, 2, 4), false);
You can also call the select method passing the index or the row and column you want to select. In this case, the new selection always scrolls into view. For example:
// select cell 1,1 and scroll it into view
grid.select(1, 1);
Range to select (or index of the row to select).
Whether to scroll the new selection into view (or index, name, or binding of the column to select).
The GridPanel to the selected range belongs GridPanel
selectAll(): void
Selects all the cells on the grid.
setCellData(r: number, c: string | number, value: any, coerce?: boolean, invalidate?: boolean): boolean
Sets the value of a cell in the scrollable area of the grid.
Index of the row that contains the cell.
Index, name, or binding of the column that contains the cell.
Value to store in the cell.
Whether to change the value automatically to match the column's data type.
Whether to invalidate the grid to show the change.
setClipString(text: string, rng?: CellRange): void
Parses a string into rows and columns and applies the content to a given range.
Hidden rows and columns are skipped.
Tab and newline delimited text to parse into the grid.
CellRange to copy. If omitted, the current selection is used.
startEditing(fullEdit?: boolean, r?: number, c?: number | string, focus?: boolean, evt?: any): boolean
Starts editing a given cell.
Editing in the FlexGrid is similar to editing in Excel: Pressing F2 or double-clicking a cell puts the grid in **full-edit** mode. In this mode, the cell editor remains active until the user presses Enter, Tab, or Escape, or until he moves the selection with the mouse. In full-edit mode, pressing the cursor keys does not cause the grid to exit edit mode.
Typing text directly into a cell puts the grid in **quick-edit mode**. In this mode, the cell editor remains active until the user presses Enter, Tab, or Escape, or any arrow keys.
Full-edit mode is normally used to make changes to existing values. Quick-edit mode is normally used for entering new data quickly.
While editing, the user can toggle between full and quick modes by pressing the F2 key.
Whether to stay in edit mode when the user presses the cursor keys. Defaults to true.
Index of the row to be edited. Defaults to the currently selected row.
Index, name, or binding of the column to be edited. Defaults to the currently selected column.
Whether to give the editor the focus when editing starts. Defaults to true.
Event that triggered this action (usually a keypress or keydown).
toggleDropDownList(): boolean
Toggles the visibility of the drop-down list box associated with the currently selected cell.
The drop-down list is created automatically based on the column's Column.dataMap property.
This method can be used to show the drop-down list automatically when the cell enters edit mode, or when the user presses certain keys.
For example, this code causes the grid to show the drop-down list whenever the grid enters edit mode:
// show the drop-down list when the grid enters edit mode
theGrid.beginningEdit.addHandler(() => {
theGrid.toggleDropDownList();
});
This code causes the grid to show the drop-down list when the grid enters edit mode after the user presses the space bar:
// show the drop-down list when the user presses the space bar
theGrid.hostElement.addEventListener('keydown', (e) => {
if (e.keyCode == 32) {
e.preventDefault();
theGrid.toggleDropDownList();
}
}, true);
Occurs after the user auto-sizes a column by double-clicking the right edge of a column header cell.
Occurs after the user auto-sizes a row by double-clicking the bottom edge of a row header cell.
Occurs before the user auto-sizes a column by double-clicking the right edge of a column header cell.
Occurs before the user auto-sizes a row by double-clicking the bottom edge of a row header cell.
Occurs before a cell enters edit mode.
The 'data' property of the handler parameters contains a reference to the DOM event that caused the grid to enter edit mode.
The event handler may cancel the edit operation.
Occurs when a cell edit is ending.
You can use this event to perform validation and prevent invalid edits. For example, the code below prevents users from entering values that do not contain the letter 'a'. The code demonstrates how you can obtain the old and new values before the edits are applied.
function cellEditEnding(flex, e) {
// get old and new values
let oldVal = flex.getCellData(e.row, e.col),
newVal = flex.activeEditor.value;
// cancel edits if newVal doesn't contain 'a'
e.cancel = newVal.indexOf('a') < 0;
}
Setting the cancel parameter to true causes the grid to discard the edited value and keep the cell's original value.
If you also set the stayInEditMode parameter to true, the grid will remain in edit mode so the user can correct invalid entries before committing the edits.
Occurs after a column group has been expanded or collapsed.
The 'data' property of the handler parameters contains a reference to the ColumnGroup that is about to change.
Occurs when a column group is about to be expanded or collapsed.
The 'data' property of the handler parameters contains a reference to the ColumnGroup that is about to change.
Occurs after the user has copied the selection content to the clipboard by pressing one of the clipboard shortcut keys (see the autoClipboard property).
Occurs when the user is copying the selection content to the clipboard by pressing one of the clipboard shortcut keys (see the autoClipboard property).
The event handler may cancel the copy operation.
Occurs after the user has deleted a row by pressing the Delete key (see the allowDelete property).
Occurs when the user is deleting a selected row by pressing the Delete key (see the allowDelete property).
The event handler may cancel the row deletion.
Occurs as the user drags a column to a new position.
The handler may cancel the event to prevent users from dropping columns at certain positions. For example:
// remember column being dragged
flex.draggingColumn.addHandler((s, e) => {
theColumn = s.columns[e.col].binding;
});
// prevent 'sales' column from being dragged to index 0
s.draggingColumnOver.addHandler((s, e) => {
if (theColumn == 'sales' && e.col == 0) {
e.cancel = true;
}
});
Occurs when an element representing a cell has been created.
This event can be used to format cells for display. It is similar in purpose to the itemFormatter property, but has the advantage of allowing multiple independent handlers.
For example, this code removes the 'wj-wrap' class from cells in group rows:
flex.formatItem.addHandler((flex, e) => {
if (flex.rows[e.row] instanceof GroupRow) {
wijmo.removeClass(e.cell, 'wj-wrap');
}
});
Occurs after a group has been expanded or collapsed.
Occurs when a group is about to be expanded or collapsed.
Occurs when invalid input is detected.
Invalid input may occur when the user types or pastes a value that cannot be converted to the proper type, or a value that is outside the valid range.
If the event handler cancels the event, the control will retain the invalid content and the focus, so users can correct the error.
If the event is not canceled, the control will ignore the invalid input and will retain the original content.
Occurs before the grid is bound to a new items source.
Occurs after the grid rows have been bound to items in the data source.
Occurs before the grid rows are bound to items in the data source.
Occurs after the user has pasted content from the clipboard by pressing one of the clipboard shortcut keys (see the autoClipboard property).
Occurs after the user has pasted content from the clipboard into a cell (see the autoClipboard property).
The 'data' property of the handler parameters contains the cell's original value (before the new value was pasted).
Occurs when the user is pasting content from the clipboard by pressing one of the clipboard shortcut keys (see the autoClipboard property).
The 'data' property of the handler parameters contains a copy of the text being pasted into the grid.
The event handler may cancel the paste operation.
Occurs when the user is pasting content from the clipboard into a cell (see the autoClipboard property).
The 'data' property of the handler parameters contains the text being pasted into the cell.
The event handler may cancel the paste operation.
Occurs after one or more columns are pinned (or unpinned).
Occurs before one or more columns are pinned (or unpinned).
Occurs when an editor cell is created and before it becomes active.
The event handler can access the editor element using the grid's activeEditor property.
Occurs after the control has refreshed its contents.
Occurs when the control is about to refresh its contents.
Occurs when the user creates a new item by editing the new row template (see the allowAddNew property).
The event handler may customize the content of the new item or cancel the new item creation.
Occurs when a row edit is ending, before the changes are committed or canceled.
This event can be used in conjunction with the rowEditStarted event to implement deep-binding edit undos. For example:
// save deep bound values when editing starts
let itemData = {};
s.rowEditStarted.addHandler((s, e) => {
let item = s.collectionView.currentEditItem;
itemData = {};
s.columns.forEach(function (col) {
if (col.binding.indexOf('.') > -1) { // deep binding
let binding = new wijmo.Binding(col.binding);
itemData[col.binding] = binding.getValue(item);
}
})
});
// restore deep bound values when edits are canceled
s.rowEditEnded.addHandler((s, e) => {
if (e.cancel) { // edits were canceled by the user
let item = s.collectionView.currentEditItem;
for (let k in itemData) {
let binding = new wijmo.Binding(k);
binding.setValue(item, itemData[k]);
}
}
itemData = {};
});
Occurs after the user applies a sort by clicking on a column header.
Occurs before the user applies a sort by clicking on a column header.
The 'data' property of the handler parameters contains a reference to the DOM event that caused the sort.
The event handler may cancel the sort action.
Occurs when the grid finishes creating/updating the elements that make up the current view.
The grid updates the view in response to several actions, including:
Occurs when the grid starts creating/updating the elements that make up the current view.