RestCollectionView OData (Angular)

This sample shows how you can extend the RestCollectionView class to create a custom RestCollectionViewOData class that talks to OData sources.

The RestCollectionViewOData class is similar to the wijmo.odata.ODataCollectionView class that ships with Wijmo. It supports CRUD operations as well as server-based sorting, filtering, and pagination.

This sample uses a read-only data source, so the grid is not editable.

Learn about FlexGrid | Loading Data Documentation | CollectionView API Reference

This example uses Angular.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; // import '@angular/compiler'; import { Component, Inject, enableProdMode, NgModule } from '@angular/core'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { BrowserModule } from '@angular/platform-browser'; import { WjGridModule } from '@mescius/wijmo.angular2.grid'; import { WjGridFilterModule } from '@mescius/wijmo.angular2.grid.filter'; import { WjInputModule } from '@mescius/wijmo.angular2.input'; import { RestCollectionViewOData } from './rest-collection-view-odata'; // // Northwind OData service const urlOData = 'https://services.odata.org/V4/Northwind/Northwind.svc'; // fields to show on the grid const fields = 'CustomerID,CompanyName,ContactName,ContactTitle,Address,City,Region,PostalCode,Country,Phone,Fax'.split(','); @Component({ selector: 'app-component', templateUrl: 'src/app.component.html' }) export class AppComponent { view = new RestCollectionViewOData(urlOData, 'Customers', { fields: fields, pageSize: 8, sortDescriptions: ['CustomerID'] }); // // apply auto-numbering cell template initGrid(theGrid: any) { theGrid.topLeftCells.columns[0].cellTemplate = ($: any) => $.text || ($.row.index + 1).toString() } } // @NgModule({ imports: [WjGridModule, WjGridFilterModule, WjInputModule, BrowserModule], declarations: [AppComponent], bootstrap: [AppComponent] }) export class AppModule { } // enableProdMode(); // Bootstrap application with hash style navigation and global services. platformBrowserDynamic().bootstrapModule(AppModule);
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo RestCollectionView OData</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Polyfills --> <script src="node_modules/core-js/client/shim.min.js"></script> <script src="node_modules/zone.js/fesm2015/zone.min.js"></script> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.21.5/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> // workaround to load 'rxjs/operators' from the rxjs bundle System.import('rxjs').then(function (m) { System.set(SystemJS.resolveSync('rxjs/operators'), System.newModule(m.operators)); System.import('./src/app.component'); }); </script> </head> <body> <app-component></app-component> </body> </html>
<div class="container-fluid"> <label> Paging <input id="paging" type="checkbox" [checked]="view.pageSize > 0" (change)="view.pageSize = view.pageSize == 0 ? 8 : 0"> </label> <br /> <wj-collection-view-navigator [cv]="view" [byPage]="true"> </wj-collection-view-navigator> <wj-flex-grid #theGrid [isReadOnly]="true" [showMarquee]="true" [deferResizing]="true" [alternatingRowStep]="0" selectionMode="MultiRange" [itemsSource]="view" (initialized)="initGrid(theGrid)"> <wj-flex-grid-filter></wj-flex-grid-filter> </wj-flex-grid> </div>
body { margin-bottom: 36pt; } .wj-flexgrid { max-height: 400px; }
import { RestCollectionView } from '@mescius/wijmo.rest'; import { DataType, DateTime, httpRequest, copy, changeType, isString, isDate, asString, asNumber, isNumber, asArray, assert } from '@mescius/wijmo'; // regex used to parse dates const _rxDate = /^\d{4}\-\d{2}\-\d{2}T\d{2}\:\d{2}\:\d{2}|\/Date\([\d\-]*?\)/; /** * Class that extends {@link ServerCollectionViewBase} to support OData sources. */ export class RestCollectionViewOData extends RestCollectionView { _url: string; _tbl: string; _odv = 4; // OData Version _pendingRequest: XMLHttpRequest; /** * Initializes a new instance of the {@link RestCollectionViewOData} class. * * @param url Url of the OData service (for example * 'https://services.odata.org/Northwind/Northwind.svc/'). * @param tableName Name of the table (entity) to retrieve from the service. * If not provided, a list of the tables (entities) available is retrieved. * @param options JavaScript object containing initialization data (property * values and event handlers) for the {@link ODataCollectionView}. */ constructor(url: string, tableName: string, options?: any) { super(); this._url = asString(url, false); this._tbl = asString(tableName); copy(this, options); } /** * Gets or sets an array containing the names of the key fields. * * Key fields are required for update operations (add/remove/delete). */ get keys(): string[] { return this._keys; } set keys(value: string[]) { this._keys = asArray(value); } /** * Gets or sets the OData version to use. */ get odataVersion(): number { return this._odv; } set odataVersion(value: number) { this._odv = asNumber(value); } // ** implementation // URL handling _getServiceUrl() { let url = this._url; if (url[url.length - 1] != '/') { url += '/'; } return url; } _getReadUrl(link?: string) { let url = this._getServiceUrl(); if (link) { url = link.indexOf('http') == 0 ? link : url + link; } else if (this._tbl) { url += this._tbl; } return url; } private _getWriteUrl(item?: any): string { let url = this._getServiceUrl() + this._tbl; if (item) { assert(this.keys && this.keys.length > 0, 'write operations require keys.'); let keys: string[] = []; this.keys.forEach(key => { let itemKey = item[key]; if (itemKey == null) { itemKey = ''; } if (isString(itemKey)) { // enclose string keys in quotes itemKey = '\'' + itemKey + '\''; } keys.push(this.keys.length == 1 // add key name only if we have multiple keys ? itemKey : key + '=' + itemKey); }); if (keys.length) { url += '(' + keys.join(',') + ')'; } } return url; } // read parameters apply fields, sort, paging, and filter _getReadParams(nextLink?: string): any { let settings: any = {}; // we only do json if (!nextLink || (nextLink.indexOf('$format') < 0 && nextLink.indexOf('%24format') < 0)) { settings.$format = 'json'; } // no parameters needed if they are already on the nextLink argument if (!nextLink) { // more setting if we have a table if (this._tbl) { // get filtered (but not paged) item count (OData4 uses $count, earlier versions use $inlinecount) if (this._odv < 4) { settings.$inlinecount = 'allpages'; } else { settings.$count = true; } // specify fields to retrieve if (this.fields) { settings.$select = this.fields.join(','); } // apply sort if (this.sortOnServer && this.sortDescriptions.length) { let sort = ''; this.sortDescriptions.forEach(sd => { if (sort) sort += ','; sort += sd.property; if (!sd.ascending) sort += ' desc'; }); settings.$orderby = sort; } // apply paging if (this.pageOnServer && this.pageSize > 0) { settings.$skip = this.pageIndex * this.pageSize; settings.$top = this.pageSize; } // apply filter if (this.filterOnServer && this._filterProvider) { settings.$filter = this._asODataFilter(this._filterProvider); } } } return settings; } // parse data _jsonReviver(key: string, value: any): any { if (typeof value === 'string' && _rxDate.test(value)) { value = value.indexOf('/Date(') == 0 // verbosejson ? new Date(parseInt(value.substr(6))) : new Date(value); } return value; } // gets the OData filter definition from a wijmo.grid.filter.FlexGridFilter object. // https://www.odata.org/documentation/odata-version-2-0/uri-conventions/ _asODataFilter(filter: any): string { let def = ''; for (let c = 0; c < filter.grid.columns.length; c++) { let col = filter.grid.columns[c], cf = filter.getColumnFilter(col, false); if (cf && cf.isActive) { if (def) { def += ' and '; } if (cf.conditionFilter && cf.conditionFilter.isActive) { def += this._asODataConditionFilter(cf.conditionFilter); } else if (cf.valueFilter && cf.valueFilter.isActive) { def += this._asODataValueFilter(cf.valueFilter); } } } return def; } _asODataValueFilter(vf: any): string { let col = vf.column, fld = col.binding, map = col.dataMap, def = ''; // build condition with 'eq/or' for (let key in vf.showValues) { let value = changeType(key, col.dataType, col.format); if (map && isString(value)) { // TFS 239356 value = map.getKeyValue(value); } if (def) def += ' or '; def += this._asEquals(fld, value, col.dataType); } // enclose in parenthesis if not empty if (def.length) { def = '(' + def + ')'; } // all done return def; } _asEquals(fld: string, value: any, type: DataType): string { let def = '', DT = DataType; if (value === '' || value == null) { // null or empty def += fld + ' eq null'; if (type == DT.String) { // empty OK for strings only def += ' or ' + fld + ' eq \'\''; } } else if (type == DT.Date) { // non-null/empty dates (TFS 458080) def += fld + ' ge ' + this._asODataValue(value, type) + ' and ' + fld + ' lt ' + this._asODataValue(DateTime.addDays(value, 1), type); } else { // other types def += fld + ' eq ' + this._asODataValue(value, type); } return '(' + def + ')'; } _asODataConditionFilter(cf: any): string { let c1 = this._asODataCondition(cf, cf.condition1), c2 = this._asODataCondition(cf, cf.condition2); if (c1 && c2) return '(' + c1 + (cf.and ? ' and ' : ' or ') + c2 + ')'; if (c1) return '(' + c1 + ')'; if (c2) return '(' + c2 + ')'; return null; } _asODataCondition(cf: any, cnd: any): string { let col = cf.column, fld = col.binding, map = col.dataMap, value = cnd.value; if (map && isString(value)) { // TFS 440901 value = map.getKeyValue(value); } value = this._asODataValue(value, cf.column.dataType); switch (cnd.operator) { case 0: // EQ = 0, return fld + ' eq ' + value; case 1: // NE = 1, return fld + ' ne ' + value; case 2: // GT = 2, return fld + ' gt ' + value; case 3: // GE = 3, return fld + ' ge ' + value; case 4: // LT = 4, return fld + ' lt ' + value; case 5: // LE = 5, return fld + ' le ' + value; case 6: // BW = 6, return 'startswith(' + fld + ',' + value + ')'; case 7: // EW = 7, return 'endswith(' + fld + ',' + value + ')'; case 8: // CT = 8, return this._odv >= 4 ? 'contains(' + fld + ',' + value + ')' // OData4 : 'substringof(' + value.toLowerCase() + ', tolower(' + fld + '))'; // OData2 case 9: // NC = 9 return this._odv >= 4 ? 'not contains(' + fld + ',' + value + ')' // OData4 : 'not substringof(' + value.toLowerCase() + ', tolower(' + fld + '))'; // OData2 } } _asODataValue(value: any, dataType: DataType): string { if (isDate(value)) { value = value.toJSON(); if (this._odv < 4) { // TFS 323961 value = "datetime'" + value.substr(0, 10) + "'"; } return value; } else if (isString(value)) { return "'" + value.replace(/'/g, "''") + "'"; } else if (value != null) { return value.toString(); } return dataType == DataType.String ? "''" : null; } // convert objects before posting to OData services private _convertToDbFormat(item: any): any { if (this._odv >= 4) { return item; } let obj = {}; for (let key in item) { let value = item[key]; if (isNumber(value)) { // convert numbers to strings in versions prior to 4.0. // failing to do this may cause the service to throw an error: // 'Cannot convert a primitive value to the expected type' // which can in turn causes an HTTP 400 (Bad Request) error value = value.toString(); } obj[key] = value; } return obj; } // ** overrides protected async getItems(link?: string): Promise<any[]> { // cancel any pending requests if (this._pendingRequest) { //console.log('aborting pending request'); this._pendingRequest.abort(); } return new Promise<any[]>(resolve => { this._pendingRequest = httpRequest(this._getReadUrl(link), { requestHeaders: this.requestHeaders, data: this._getReadParams(link), success: async xhr => { // parse response (handles OData4 and earlier) let resp = JSON.parse(xhr.responseText, this._jsonReviver), arr: any[] = resp.d ? resp.d.results : resp.value, count: number | string = resp.d ? resp.d.__count : (resp['odata.count'] || resp['@odata.count']), nextLink: string = resp.d ? resp.d.__next : (resp['odata.nextLink'] || resp['@odata.nextLink']); // update total item count if (count != null) { this._totalItemCount = isString(count) ? parseInt(count) : count; } // get data from next link if (nextLink) { let nextPage = await this.getItems(nextLink); arr = arr.concat(nextPage); } // done resolve(arr); }, error: xhr => this._raiseError(xhr.responseText, false), complete: xhr => this._pendingRequest = null // no pending requests }); }); } protected addItem(item: any): Promise<any> { // write operations require keys if (!this.keys || !this.keys.length) { return null; } return new Promise<any[]>(resolve => { let url = this._getWriteUrl(); let requestHeaders = { 'Accept': 'application/json' }; if (this.requestHeaders) { for (let k in this.requestHeaders) { requestHeaders[k] = this.requestHeaders[k]; } } httpRequest(url, { method: 'POST', requestHeaders: requestHeaders, data: this._convertToDbFormat(item), success: xhr => { // update keys in the new item, refresh the view let newItem = JSON.parse(xhr.responseText, this._jsonReviver); this.keys.forEach(key => { item[key] = newItem[key]; }); this.refresh(); }, error: xhr => this._raiseError(xhr.responseText, true) }); }); } protected patchItem(item: any): Promise<any> { // write operations require keys if (!this.keys || !this.keys.length) { return null; } return new Promise<any[]>((resolve) => { let url = this._getWriteUrl(this._edtClone); httpRequest(url, { method: 'PATCH', //'PUT', requestHeaders: this.requestHeaders, data: this._convertToDbFormat(item), success: xhr => resolve(item), error: xhr => this._raiseError(xhr.responseText, true) }); }); } protected deleteItem(item: any): Promise<any> { // write operations require keys if (!this.keys || !this.keys.length) { return null; } return new Promise<any[]>(resolve => { let url = this._getWriteUrl(item); httpRequest(url, { method: 'DELETE', requestHeaders: this.requestHeaders, success: xhr => { resolve(item); }, error: xhr => this._raiseError(xhr.responseText, true) }); }); } }
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packages: { "./src": { defaultExtension: 'ts' }, "node_modules": { defaultExtension: 'js' }, wijmo: { defaultExtension: 'js', } } }); })(this);