# ColWidthChanged

Learn the syntax and arguments for the ColWidthChanged event available in Spread for ASP.NET.

## Content

Occurs when the column width has changed.

## Syntax

[Inline HTML]

```html
<ELEMENT ColWidthChanged = "handler" ...>
```

[JavaScript]

```javascript
FpSpread1.addEventListener("ColWidthChanged", handler, ...)
```

or

```javascript
FpSpread1.onColWidthChanged = handler
```

## Arguments

***event.sizeHeader***
Whether the row indexes are column header rows
***event.col***
Column that changed
***event.width***
New column width
***event.spread***
Spread control that raises the event

## Return Type

None

## Remarks

This event is triggered when the component has finished resizing the column. The sizeHeader argument returns an undefined value in Mozilla Firefox.

## Example

This example JavaScript code maps the event for the Spread on the client side.

```javascript
<script lang="javascript" type="text/javascript">
    window.onload = function () {
      var spread1 = document.getElementById("<%=FpSpread1.ClientID %>");
      if (document.all) {
      // IE
      if (spread1.addEventListener) {
      // IE9
      spread1.addEventListener("ColWidthChanged", changeCompleted, false);
      } else {
      // Other versions of IE and IE9 quirks mode (no doctype set)
      spread1.onColWidthChanged = changeCompleted;
      }
}
      else {
      // Firefox
      spread1.addEventListener("ColWidthChanged", changeCompleted, false);
      }
    }
    
    function changeCompleted(event) {
      alert("The column has been resized.");
    }
    
</script>
```

## See Also

[RowHeightChanged](/spreadnet/docs/latest/online-asp/overview/spweb-clientscriptref/clientscript-members/clientscript-allevents/CSSR-onRowHeightChanged)
[SelectionChanged](/spreadnet/docs/latest/online-asp/overview/spweb-clientscriptref/clientscript-members/clientscript-allevents/CSSR-onSelectionChanged)
[Scripting Members](/spreadnet/docs/latest/online-asp/overview/spweb-clientscriptref/clientscript-members)