|
r.a.d.controls version
|
Q4 2006
|
| .NET version |
ASP.NET 2.0 + ASP.NET AJAX
|
| Visual Studio version |
2005
|
| programming language |
C# + JavaScript
|
| browser support |
all browsers supported by r.a.d.controls
|
PROJECT DESCRIPTION Sometimes we need to trigger an
UpdatePanel update from custom JavaScript, most often in a DOM event handler. For example we may want to refresh a RadGrid control, so that new data gets displayed to the user.
We can use a regular
__doPostBack() function call to that while passing the grid unique ID.
ASP.NET AJAX's
PageRequestManager object will detect that and turn it
into an Ajax request coming from the grid inside the
UpdatePanel. This
will update the panel if we have the
ChildrenAsTriggers property set
to true (this is the default).
| <script type="text/javascript"> |
| function pageLoad() |
| { |
| $addHandler($get("postBackButton"), "click", Function.createDelegate(null, GridPostBack)); |
| } |
| |
| function GridPostBack() |
| { |
| __doPostBack('<%=RadGrid1.UniqueID %>', "customPostback"); |
| } |
| |
| </script> |
We will have to override the
RaisePostBackEvent page method on the server
to intercept our custom postback and do something of value:
| protected override void RaisePostBackEvent(IPostBackEventHandler sourceControl, string eventArgument) |
| { |
| //is this our own custom postback? if not, let the base implementation handle it |
| if (eventArgument == "customPostback") |
| { |
| ScriptManager.RegisterStartupScript(Page, Page.GetType(), "customPostBack", "Sys.Debug.trace('customPostBack')", true); |
| } |
| else |
| { |
| base.RaisePostBackEvent(sourceControl, eventArgument); |
| } |
| } |