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POGet ASP.NET control which fired a postback within a AJAX UpdatePanel
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  1. POGet ASP.NET control which fired a postback within a AJAX UpdatePanel
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    copied!<p>Related to this question: <a href="https://stackoverflow.com/questions/3175513/on-postback-how-can-i-check-which-control-cause-postback-in-page-init-event">On postback, how can I check which control cause postback in Page_Init event</a></p> <p>If the control is wrapped in an ASP.NET AJAX UpdatePanel, the variable "control" is empty because it has a different ID after the AJAX PostBack. Is there a solution to get the control which fired a postback within an ASP.NET Ajax UpdatePanel?</p> <pre><code>public static string GetPostBackControlName( Page page ) { Control control = null; /** * First we will check the "__EVENTTARGET" because if the postback is made * by controls which used the _doPostBack function, it will be available in the Request.Form collection. */ string ctrlname = page.Request.Params["__EVENTTARGET"]; if ( !String.IsNullOrEmpty( ctrlname ) ) { control = page.FindControl( ctrlname ); } else { /** * If __EVENTTARGER is null, the control is a button-type and * need to iterate over the form collection to find it. */ Control c = null; string ctrlStr = null; foreach ( string ctl in page.Request.Form ) { if ( ctl.EndsWith( ".x" ) || ctl.EndsWith( ".y" ) ) { /** * ImageButtons have an additional "quasi-property" in their ID which identifies * the mouse-coordinates (X and Y). */ ctrlStr = ctl.Substring( 0, ctl.Length - 2 ); c = page.FindControl( ctrlStr ); } else { c = page.FindControl( ctl ); } if ( c is Button || c is ImageButton ) { control = c; break; } } } if ( control != null ) { return control.ID; } return string.Empty; } </code></pre>
 

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