How to render a string into an ASP.NET MVC view Javascript wrapped in quotes

Question

In the JQuery Validate plugin, you can validate file extensions like this:

 $("#my-form").validate({
        rules: {
            file: {
                required: true,
                extension: "xls|csv"
            }
        });

I have a list of valid extensions in my MVC application that I use server side, and I thought it'd be neat to only maintain it in one place. So I tried to do this:

 $("#my-form").validate({
        rules: {
            file: {
                required: true,
                extension: @string.Join("|", new FileHelper().ValidFileExtensions))
            }
        });

But that fails because it's not wrapped in quotes. However, this:

extension: @string.Format("\"{0}\"", string.Join("|", new FileHelper().ValidFileExtensions)))

Results in the MVC engine rendering the quotes as " markup.

Can I get my file extensions wrapped in quotes?

What your currently doing will only ever give you client side validation which can be easily overridden and you would need to repeat your logic again in the controller. Suggest you consider a validation attribute to give you both client and server side validation - refer this answer for an example — user3559349
– user3559349, Commented May 13, 2016 at 0:49
@StephenMuecke I'd already put in server-side validation with a simple check for Request.Files[].FileName > error page. I wanted to keep all my client-side validation together in jQuery validate rather than use the built in mvc stuff for some of it. — Bob Tway
– Bob Tway, Commented May 13, 2016 at 8:12

David · Accepted Answer · 2016-05-12 16:37:53Z

1

The quotes are client-side, not server-side. Just put them directly in the client-side code like you would for any other string literal:

extension: '@string.Join("|", new FileHelper().ValidFileExtensions))'

answered May 12, 2016 at 16:37

David

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1 Comment

Bob Tway Over a year ago

Ah, I had assumed the right-hand comma would be interpreted as part of the compiled command. Thanks.

komeil shahmoradi · Accepted Answer · 2016-05-12 18:58:11Z

0

Declare variable in Your view like this:

@{
   string validation = string.Format("\"{0}\"", string.Join("|", new FileHelper().ValidFileExtensions)));
 }

And use like this:

extension: @validation

answered May 12, 2016 at 18:58

komeil shahmoradi

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