Question

I have a a CollapsiblePanelExtender with the usual extend and collapse buttons….I would like to have a click event fire off when the extender is extended and a different click event fire off when the extender is collapsed. But the most important event is when it is extended. I could live without a click even on collapse.

Most of the examples I’ve found online searching using: “CollapsiblePanelExtender” “click event” is having the extender react based on a click even else where…

I want the extender to fire off a JS when clicked.

How should I go about accomplishing this?
Am I asking the wrong question/using the wrong search strings?

            CollapsiblePanelExtender extendatron = new CollapsiblePanelExtender();
            extendatron.ID = "cpe" + MenuId;
            extendatron.TargetControlID = "pnlContent" + strMenuId;
            extendatron.ExpandControlID = "pnlMenu" + strMenuId;
            extendatron.CollapseControlID = "pnlMenu" + strMenuId;
            extendatron.Collapsed = bCollapsed;
            extendatron.TextLabelID = strMenuName;
            extendatron.ExpandedText = m_strButtonLabelHide;
            extendatron.CollapsedText = m_strButtonLabelShow;
            extendatron.ImageControlID = "imglnk" + strMenuId;
            extendatron.CollapsedImage = "~/App_Themes/default/nbExpand.gif";
            extendatron.ExpandedImage = "~/App_Themes/default/nbCollapse.gif";
            extendatron.SuppressPostBack = true;
            extendatron.ScrollContents = false;

            var extender = $find('extendatron'); //this would be <%=myExtender.ClientID%>
            extender.add_collapsed( function() { alert('collapsed'); });
            extender.add_expanded( function() { alert('expanded'); });

Answer 1

I assume you’re talking about the ASP.Net AJAX Control Toolkit. You can add handlers to the collapsed and expanded events as follows:

//this would be <%=myExtender.ClientID%> when using a master page
var extender = $find('myExtender_ClientId'); 
extender.add_collapsed( function() { alert('collapsed'); });
extender.add_expanded( function() { alert('expanded'); });

Let me know if you have any questions…I’ve done a fair bit of customizing some of these objects in various solutions.