Razor Syntax and Javascript

Question

As a test I'm converting a proof-of-concept app we've written from Web Forms to Razor, simply so we can evaluate it.

I've run into one problem so far that's making my head hurt..generating client-side Javascript...

Web-Forms

<script type="text/javascript">     var jqGridIdList = "<%: Url.Action ("getidlist", "office", new { area = "reports" }) %>";      var availableIds = [];     <% for (var i = 0; i < Model.Data.Count (); i++) { %>     availableIds.push({ value : "<%: Model.Data.ElementAt (i).Text %>", label : "<%: Model.Data.ElementAt (i).Text %>" });     <% } %> </script> 

Razor Syntax

<script type="text/javascript">     var jqGridIdList = "@Url.Action("getidlist", "office", new { area = "reports" })";      var availableIds = [];     @for(var i = 0; i < Model.Data.Count (); i++) {     availableIds.push({ value : "@Model.Data.ElementAt(i).Text", label : "@Model.Data.ElementAt(i).Text" });     } </script> 

The compiler gives me the following error on the 'availableIds.push' line:

Compiler Error Message: CS1525: Invalid expression term '{'

It's obviously trying to compile it as C#...but how do I stop it?

Thanks,
Kieron

Answer 1

You need to wrap it in the pseudo element <text>. This will switch the parser back to html mode and it will then parse the javascript as part of the html and not c#. The reason it happens is the @for() is a c# block and anything treated within is also considered c# until it's escaped by an html tag. Since you probably don't want an html tag razor provides the <text> tag to switch modes.

If you notice the difference in your asp.net webforms you end the <% for line with a %> which takes it out of c# mode. If you download the razor highlighter extension for visual studio 2010 it will help you see when code is treated as code and html is treated as html.

<script type="text/javascript">     var jqGridIdList = "@Url.Action("getidlist", "office", new { area = "reports" })";      var availableIds = [];     @for(var i = 0; i < Model.Data.Count (); i++) {         <text>availableIds.push({ value : "@Model.Data.ElementAt(i).Text", label : "@Model.Data.ElementAt(i).Text" });</text>     } </script> 

Update for latest version

You can now use the @: syntax for even more readability

<script type="text/javascript">     var jqGridIdList = "@Url.Action("getidlist", "office", new { area = "reports" })";      var availableIds = [];     @for(var i = 0; i < Model.Data.Count (); i++) {         @:availableIds.push({ value : "@Model.Data.ElementAt(i).Text", label : "@Model.Data.ElementAt(i).Text" });     } </script>