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How to Call Javascript function from code behind after button click event;

 string popupScript = "<script language='javascript'>" +
                         "alert('hai');" +
                       "</script>";

                ClientScript.RegisterStartupScript(Page.GetType(), "script", popupScript, true);

I tried above script but not working

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4 Answers

up vote 5 down vote

You already added the script tags, so pass false as last argument:

string popupScript = 
    "<script type=\"text/javascript\">" +
    "alert('hai');" +
    "</script>";
ClientScript.RegisterStartupScript(Page.GetType(), "script", popupScript, false);

or leave it to the framework:

string popupScript = "alert('hai');";
ClientScript.RegisterStartupScript(Page.GetType(), "script", popupScript, true);
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up vote 0 down vote

Remove the language attribute. Change it to type='text/javascript'

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up vote 0 down vote

In addition to all of the advice of the others, if the element firing this event is in an update panel you will need a full post-back trigger.

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up vote 1 down vote

Since ClientScript.RegisterStartupScript is an overloaded function you can also leave it without the last 'addScriptTags' boolean when you want to put in the script tags yourself. It defaults to false.

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