Convert List<string> to Json Array on client ASP.NET MVC

Question

I have a string List on server that Im sending to a partial view.

List<string> list = new List<string>(); list.Add("1"); list.Add("2");

On Client Side I'm converting the list to json like this:

var stringList = @(Html.Raw(Json.Encode(this.Model.StringList))); alert(stringList );

The alert reply is: 1,2 and I should get ["1","2"].

Any clue on how to deal with this?

Thanks a lot.

Go to your web browser's console, and enter alert(["1", "2"]). Hit Enter. It will alert 1,2 because ["1", "2"].toString() === "1,2". You should try to console.log(stringList) and see what it really is -- perhaps you already have what you seek. — Linus Thiel, CommentedAug 14, 2012 at 20:03

Nick Bork · Accepted Answer · 2012-08-14 20:06:27Z

What your asking for is a plain and simple array, not json.

That aside, just append brackets around it:

var stringList = [@(Html.Raw(Json.Encode(this.Model.StringList)))]; alert(stringList );

This works for numbers but if you intend to use it with real string values (like words or such) you'll need a different approach. It isn't clear if you intent to use this with numbers treated as strings as your example or not.

I don't see why you're telling him to manually add square brackets. Json.Encode already adds square brackets. — Andrew Shepherd, CommentedFeb 5, 2014 at 22:06
No, in this case Json.Encode outputs a comma separated list of values without the brackets. The brackets would only be output if the object being encoded was something that had a property that was a list of objects. This is an older answer that was created over a year and a half ago, newer versions of MVC may have changes this behavior. — Nick Bork, CommentedFeb 5, 2014 at 22:24

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