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OnClientResizing

The OnClientResizing client-side event handler is called when a control is about to be resized. The resize can occur because of a user action (such as dragging a split bar or resizing the window that contains a splitter), or as the result of a a call to a client-side method.

note

The OnClientResizing event is supported by RadSplitter , RadPane , and RadSlidingPane . It takes the place of the deprecated OnClientBeforeResize event.

On RadPane and RadSlidingPane, the following two parameters are passed to the event handler:

  • sender is the pane that is about to be resized.
  • eventArgs has the following methods:

    • set_cancel() lets you prevent the pane from being resized.
    • get_cancel() returns whether the resize operation was cancelled.
    • get_delta() returns the number of pixels by which the pane's size is changing. Negative values mean the pane is getting smaller; positive values mean the pane is getting larger.
    • get_resizeDirection() returns a value indicating which side of the pane is being resized:
      1. The side on the top or left of the pane (depending on the splitter orientation).
      2. The side on the bottom or right of the pane (depending on the splitter orientation).
    note

    Because sliding panes have only a single resizable border, for RadSlidingPane , get_resizeDirection() returns null.

On RadSplitter the following two parameters are passed to the event handler:

  • sender is the splitter control that is being resized.
  • eventArgs has the following methods:
    • set_cancel() lets you prevent the splitter from being resized.
    • get_cancel() returns whether the resize operation was cancelled.
    • get_newHeight() returns the new height of the splitter, or null if the height is not changing.
    • get_newWidth() returns the new width of the splitter, or null if the width is not changing.

The following example uses the OnClientResizing event to prevent resizes that decrease the size of a pane:

<script type="text/javascript">
    function preventDecrease(sender, eventArgs) {
        if (eventArgs.get_delta() < 0)
            eventArgs.set_cancel(true);
    }
</script>
<telerik:RadSplitter RenderMode="Lightweight" runat="server" id="RadSplitter1" >
 <telerik:RadPane runat="server" id="RadPane1" Height="80px"  >
 </telerik:RadPane>
 <telerik:RadSplitBar runat="server" id="RadSplitBar1" CollapseMode="Both"  />
 <telerik:RadPane runat="server"
     id="RadPane2"
     Height="20px"
     OnClientResizing="preventDecrease">
   This Pane can only grow.
 </telerik:RadPane>
  <telerik:RadSplitBar runat="server" id="RadSplitBar2" CollapseMode="Both"  />
 <telerik:RadPane runat="server" id="RadPane3" Height="90px" >
 </telerik:RadPane>
</telerik:RadSplitter>          

OnClientResizing

<script type="text/javascript">
    function testHandler(sender, eventArgs) {
        var hChange = "";
        var wChange = "";
        if (eventArgs.get_newHeight()) {
            if (sender.get_height() != eventArgs.get_newHeight())
                hChange = "height from " + sender.get_height() +
                 " to " + eventArgs.get_newHeight();
        }
        if (eventArgs.get_newWidth()) {
            if (sender.get_width() != eventArgs.get_newWidth())
                wChange = "width from " + sender.get_width() +
                 " to " + eventArgs.get_newWidth();
        }
        if (hChange.length > 0) {
            if (wChange.length > 0)
                eventArgs.set_cancel(
            !confirm("Do you want to allow the change of " +
                     hChange + " and " + wChange + "?"));
            else
                eventArgs.set_cancel(
            !confirm("Do you want to allow the change of " +
                     hChange + "?"));
        }
        else if (wChange.length > 0)
            eventArgs.set_cancel(
            !confirm("Do you want to allow the change of " +
                     wChange + "?"));
    }
</script>
<telerik:RadSplitter
  runat="server"
  id="RadSplitter1"
  Width="90%"
  Height="90%"
  OnClientResizing="testHandler">
 <telerik:RadPane runat="server" id="RadPane1" Height="80px"   >
 </telerik:RadPane>
 <telerik:RadSplitBar runat="server" id="RadSplitBar1" CollapseMode="Both"  />
 <telerik:RadPane runat="server" id="RadPane2" Height="90px">
 </telerik:RadPane>
 <telerik:RadSplitBar runat="server" id="RadSplitBar2" CollapseMode="Both"  />
 <telerik:RadPane runat="server" id="RadPane3" >
 </telerik:RadPane>
</telerik:RadSplitter>              

See Also