CODEWITHSUNDEEP
asp.netjavascriptjqueryupdatepanel
Hcabnettek
Hcabnettek

Reputation: 12928

How can I run some javascript after an update panel refreshes?

I have a pageLoad function that sets some CSS on a .ascx control that I cannot change. On page load everything is fine, but when an update panel updates the control, my CSS is no longer applied. How can I rerun my function after the page updates?

 $(function() {
        $("textarea").attr("cols", "30");
        $("input.tbMarker").css({ "width": "100px" }).attr("cols","25");
    });

This obviously only runs on the initial page load. How can I run it after an update?

Upvotes: 65

Views: 86932

Answers (5)

brianng
brianng

Reputation: 5820

Adding an add_pageLoaded handler can also work.

Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(PageLoadedHandler);

Note: the handler will fire for any callback, but you can use sender._postBackSettings.panelID to filter when you want your function called.

More samples:

Upvotes: 49

Kartikay Tripathi
Kartikay Tripathi

Reputation: 1253

Most simple way is to use MSAjax pageLoad Event in your javascript code :

<script> 
   ///<summary>
   ///  This will fire on initial page load, 
   ///  and all subsequent partial page updates made 
   ///  by any update panel on the page
   ///</summary>
   function pageLoad(){ alert('page loaded!') }  
</script>

I have used it many times, it works like charm. Most important thing is don't confuse it with document.ready function (which will be executed only once after the page Document Object Model (DOM) is ready for JavaScript code to execute),yet pageLoad Event will get executed every time the update panel refreshes.

Source: Running script after Update panel AJAX asp.net

Upvotes: 108

Marco Ramires
Marco Ramires

Reputation: 1116

Add the code in the same form you placed your Script Manager.

Code Behind:

protected void Page_Load(object sender, EventArgs e)
{
    if (ScriptManager1.IsInAsyncPostBack)
    {
        StringBuilder sb = new StringBuilder();
        sb.Append("<script language='javascript' type='text/javascript'>");
        sb.Append("Sys.Application.add_load(func);");
        sb.Append("function func() {");
        sb.Append("Sys.Application.remove_load(func);");
        sb.Append("alert('I am Batman!');");
        sb.Append("}");
        sb.Append("</script>");
        ScriptManager.RegisterStartupScript(this, GetType(), "script", sb.ToString(), false);
    }
}

Upvotes: 16

Peter Eysermans
Peter Eysermans

Reputation: 489

You can also bind to an event in client side code (JavaScript) every time an UpdatePanel has finished like this:

        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function(){myFunction();});

So in this case myFunction(); will be called every time an UpdatePanel postback has occurred. If you execute this code when the page is loaded the function will be called on the correct time.

Upvotes: 13

womp
womp

Reputation: 116977

During your postback for the update panel, in the server code, use ClientScriptManager to add some new script to the page, something like this:

ClientScriptManager.RegisterStartupScript(
       typeof(page1), 
       "CssFix", 
       "javascriptFunctionName()", 
        true);

Encapsulate your javascript in a named function that matches the third argument there, and it should execute when the postback returns.

Upvotes: 15

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