How to call a javascript function when RadGrid Hierachy Expanding

[Deja vu]

Hi, 
I want to call a javascript function when user clicks hierarchy expand button. my hierarchyloadmode = serverondemand and i don't want to change to  hierarchyloadmode = client because i takes very long time to load radgrid. in addition my telerik version doesn't support HierarchyLoadMode.Conditional

is there any solution? 

[Kostadin]

Hi,

You could use the RegisterStartupScript() method to call a JavaScript function from the code behind. All you have to do is to execute it when ExpandCollapseCommandName has being fired.

protected void RadGrid1_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)
{
    if (e.CommandName == RadGrid.ExpandCollapseCommandName)
    {
        Page.ClientScript.RegisterStartupScript(GetType(), "Key", "AlertMessage();", true);
    }
}

Regards,
Kostadin
Telerik

[Deja vu]

Hi, 
I tried this method before but script runs after the page rendered. I want to  show a loading image on page while the server side method running. 
last week i solved this problem by using telerik:RadAjaxLoadingPanel 

Thanks.

[Kostadin]

Hello,

In this case you could ajaxified you grid and the loading panel will be displayed during the data loading. Please check out the following live example which demonstrates an ajaxified hierarchical grid.

Regards,
Kostadin
Telerik