JavaScript Syntax Error with ASP.NET Variable

Question

I have a JavaScript Variable that is set in my ASP.NET page as follows

<script type="text/javascript>
var MyVarable = <%=ASPNETVarable%>;
$(document).ready(function () {
  alert(MyVarable);
}
</script>

Now this is simplified and on the back end code ASPNETVarable is set as

protected string ASPNETVarable="My Backend Value";

The page loads & runs correctly, but in Visual Studio the line

 var MyVarable = <%=ASPNETVarable%>;

Shows that it's a "Syntax error", while it works, how do I remove this "syntax error" ?

I'm facing the same problem when I build a JavaScript function in a user control. Because the control can be used several times, I use function myFunction_<%= this.ClientID %>() { [...] } to make the function name unique for the control itself. Basically, this error appears on all cases where you do not wrap your variable between ' or ". However everything compiles and runs fine as desired. Annoying error. — Martin Braun
– Martin Braun, Commented Aug 14, 2014 at 6:14

TGH · Accepted Answer · 2014-05-14 18:16:00Z

2

Try the following

var MyVarable = '<%=ASPNETVarable%>';

answered May 14, 2014 at 18:16

TGH

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2 Comments

PGP_Protector Over a year ago

Yes that Removes the Syntax Error, but also changes the value, causing issues with the rest of the code (Jason Data)

Martin Braun Over a year ago

While this is good for string values it will not work for number variables, or other cases. For instance I want to perform specific javascript, only when a boolean is set in my code-behind. So I do if(<%= Convert.ToInt32(this.IsRequired) %>) [...] that causes the same "Syntax Error" problem.

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