Convert Javascript to Code Behind in ASP.NET

Question

I am trying to convert the following JavaScript into the code behind (C#) of an ASP.NET page. This is the JavaScript:

 function DisableButton() {
        document.getElementById("<%=Submit.ClientID %>").disabled = true;
    }
   window.onbeforeunload = DisableButton;

I am trying to build a Client Script as follows (but get error message, see after the code):

StringBuilder cstext = new StringBuilder();

cstext.Append("<script type=\"text/javascript\"> function DisableButton() {");
// I get error on the following line that semi-colon is missing
cstext.Append("document.getElementById("<%=Submit.ClientID %>").disabled = true; }";
cstext.Append("window.onbeforeunload = DisableButton;");
cstext.Append("</script>");

I get error that the semi-colon is missing. What do I need to change in my code?

Donatas Bacius · Accepted Answer · 2014-11-09 17:37:52Z

1

The line

cstext.Append("document.getElementById("<%=Submit.ClientID %>").disabled = true; }";

should be

cstext.Append("document.getElementById('" + Submit.ClientID + "').disabled = true; }");

answered Nov 9, 2014 at 17:37

Donatas Bacius

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2 Comments

Hidalgo Over a year ago

It would be nice to understand why changing the syntax from ClientID inside the percent sign and brackets to a sting works. I just don't get it; but it works.

Julien Jacobs Over a year ago

Percent sign is used when writing in the page code to indicate that some C# code should be executed when rendering the page. See msdn.microsoft.com/en-us/library/vstudio/…

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