asp.net - __doPostback - calling code behind events from JavaScript? - Stack Overflow

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I wish to call a method in my code behind from JavaScript, I sort of know how to do it.. I must call __DoPostBack passing name of control and parameters..

But what if an event doesn't exist i.e. NO CONTROL. Really what i am trying to do is call an event.. but the event doesn't exist as there is no control associated with it..

I sort of could do this:

If IsPostBack Then
       If Request(”__EVENTTARGET”).Trim() = “CleanMe” Then
           CleanMe()
       End If
.....

But this means I must do it manually. Can I not wire up an event.... otherwise I will have loads of different IFs (i.e. If this passed then call this .. etc..).

Any ideas?

Thanks

I wish to call a method in my code behind from JavaScript, I sort of know how to do it.. I must call __DoPostBack passing name of control and parameters..

But what if an event doesn't exist i.e. NO CONTROL. Really what i am trying to do is call an event.. but the event doesn't exist as there is no control associated with it..

I sort of could do this:

If IsPostBack Then
       If Request(”__EVENTTARGET”).Trim() = “CleanMe” Then
           CleanMe()
       End If
.....

But this means I must do it manually. Can I not wire up an event.... otherwise I will have loads of different IFs (i.e. If this passed then call this .. etc..).

Any ideas?

Thanks

• asp
• javascript
• events
• postback

Share Improve this question Follow edited Apr 15, 2009 at 13:57 Dan Lew 87.4k3333 gold badges184184 silver badges176176 bronze badges asked Apr 15, 2009 at 13:54 mark smithmark smith 20.9k4747 gold badges136136 silver badges190190 bronze badges

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3 Answers 3

Sorted by: Reset to default 2

You may be able to use a PageMethod to call your codebehind function, here is a link to an example: http://blogs.microsoft.co.il/blogs/gilf/archive/2008/10/04/asp-net-ajax-pagemethods.aspx

If you want to use __doPostBack(), you must have a control to receive the mand. However, you don't have to explicitly wire up an event to handle it. If you want the __doPostBack() to invoke, say, Foo(), do the following:

MyControl : IPostBackEventHandler
{
    void RaisePostBackEvent(string eventArgument)
    {
        Foo();
    }
}

Calling __doPostBack() will invoke the RaisePostBackEvent method on the targeted control.

If you realy want to wire up to an event, the option that will give you less trouble is to create a hidden asp button and click it via javascript

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