Add javascript from code behind page c#

Posted on 2014-11-21
Last Modified: 2014-11-21
Hello ,
  How do I include some js code in mt ascx page?

In my ascx page I have a tag
<asp:Literal ID="ltrlTop" runat="server"></asp:Literal>

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In my code behind (ascs,cs) file

 private string generatePreScript()
            StringBuilder sb = new StringBuilder();
            sb.Append("<script type='text/javascript'>");
            sb.Append("dataLayer.push({'event': 'pageview', 'pageview':'/vp/apply.html'}); ");
            return sb.ToString();

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I want set the ltrlTop  to the js value

tried  ltrlTop.Text = generateSuccesScript(); but I get dataLayer is undefine

Thanks for your help
Question by:SiemensSEN
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40457745
Have you looked at ScriptManager.RegisterClientScriptBlock yet?
LVL 40

Accepted Solution

Kyle Abrahams earned 500 total points
ID: 40457890
Just put this line of code where you want it to be called.  After the page is rendered the JS will fire.  

ScriptManager.RegisterStartupScript (this, this.GetType(), "MyTopCodeBlock", "dataLayer.push({'event': 'pageview', 'pageview':'/vp/apply.html'}); ", true);

Author Comment

ID: 40457910
Thanks .. so I don't need to add <asp:Literal ID="ltrlTop" runat="server"></asp:Literal> to my ascx page?
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LVL 40

Expert Comment

by:Kyle Abrahams
ID: 40457923
nope.  The registerStartupScript will inject (and fire) the javascript code.

Author Comment

ID: 40457987
Thanks,  but i still get the error  dataLayer is undefined
LVL 40

Expert Comment

by:Kyle Abrahams
ID: 40458072
that's a javascript error.  where is your dataLayer var declared?

Author Closing Comment

ID: 40458247

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