CODEWITHSUNDEEP
javascriptasp.netajaxpostback
Mahesh
Mahesh

Reputation: 1689

How to get postback element in updatepanel using javascript?

Is there a way to find out postback element in updatepanel using javascript?

I tried code below but args.get_postBackElement().id is undefined.

script>
     Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
     Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

     function BeginRequestHandler(sender, args) {
        try {
            args.get_request().set_userContext(args.get_postBackElement().id);
        }
        catch (e) {
        }
    }

    function EndRequestHandler(sender, args) {
        try {
            if (args.get_error() == undefined) {
                var sName = args.get_response().get_webRequest().get_userContext();
                if (sName == "btnDetails") {
                    //DoSomething();
                }
                else {
                    //DoSomethingelse();
                }
            }
        }
        catch (e) {
        }
    }

Upvotes: 0

Views: 2133

Answers (2)

Mahesh
Mahesh

Reputation: 1689

args.get_postBackElement() returns null if control is inside update panel.

Try following properties to find out the element:

sender._postBackSettings.async - Detect whether the request is async.

sender._postBackSettings.asyncTarget - Gets the async postback control name

$("*[name='sender._postBackSettings.asyncTarget']").attr('id') - Gets the id of the async postback control name. sender._postBackSettings.asyncTarget should be replaced by the value

Upvotes: 1

haraman
haraman

Reputation: 2742

Try this 

<script type="text/javascript">
    Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
    var postBackElementID;
    function BeginRequestHandler(sender, args) {
        try {
            postBackElementID = args.get_postBackElement().id.substring(args.get_postBackElement().id.lastIndexOf("_") + 1);
        }
        catch (e) {
        }
    }
</script>

Upvotes: 0

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