c# - How to call javascript function in code behind .cs file in Asp.net - Stack Overflow

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I tried to call the function ApplyCSS() which is in my SearchPage.ascx page inside the Script tag and in .CS file I am trying to call that function using the below code:

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "Script", "ApplyCSS();", true);

but I am getting javascript runtime error object expected.

I tried to call the function ApplyCSS() which is in my SearchPage.ascx page inside the Script tag and in .CS file I am trying to call that function using the below code:

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "Script", "ApplyCSS();", true);

but I am getting javascript runtime error object expected.

• c#
• javascript
• asp

Share Improve this question Follow edited May 8, 2014 at 12:02 Moha Dehghan 18.5k33 gold badges5959 silver badges7474 bronze badges asked May 8, 2014 at 12:02 user3395635user3395635 1711 gold badge11 silver badge77 bronze badges 1

• Closely look at the call-stack of the error to find out what causes the error. If you are using Google Chrome, press F12 and use the Developer Tools. – Moha Dehghan Commented May 8, 2014 at 12:12

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3 Answers 3

Sorted by: Reset to default 2

The likely cause of this error is that ApplyCSS(); isn't defined at the time when the function is called.

So, is the ApplyCSS(); function defined in a .js file? If so, you have to go with this kind of approach:

$(document).ready(function () { ApplyCSS(); } );

You'll need jQuery to do this

   <script type="text/javascript">
        function MyFunc(){
};
</script>


 ScriptManager.RegisterStartupScript(this, Page.GetType(), "key", "MyFunc()", true);

Semicolon is not required after MyFunc() Call. You can refer this link

Have your script line is should be

<script type='text/javascript' language="javascript">
//ApplyCSS();
</script>

and please check your function is does not threw any error.

and try with this

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "Script", "javascript:ApplyCSS();", true);

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