MVC4 read a AppKey value from web.config via javascript

Question

I've looked at some post concerning the argument but I'm still missing something

because I can't read the key (in the appSettings tag of Web.config)

 <add key="ROOT_URL_SERVER" value="hello" />

with this javascript in this view (MVC4)

<input type="text" value="@ViewBag.prova" />

<script type="text/javascript">

        var t = '<%=ConfigurationManager.AppSettings["ROOT_URL_SERVER"].ToString()%>';
        var type = '<%= ConfigurationManager.AppSettings["ROOT_URL_SERVER"] %>';
        var appSettingValue = '<%=System.Configuration.ConfigurationManager.AppSettings["ROOT_URL_SERVER"]%>';

        alert(t);
        alert(type);
        alert(appSettingValue);

    </script>

even if it works when i pass the value by the viewbag with the code

{
            string test = ConfigurationManager.AppSettings["ROOT_URL_SERVER"].ToString();
            ViewBag.prova = test;

            return View();
        }

Can you help me fix this problem? Thank you!

Niang Moore · Accepted Answer · 2018-06-26 17:25:50Z

7

You can use this

<script>
    var varName= '@System.Configuration.ConfigurationManager.AppSettings["KeyName"]';
</script>

answered Jun 26, 2018 at 17:25

Niang Moore

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2 Comments

JonSnow Over a year ago

This should have been the accepted answer.... anyway, thank you, it helped me a lot

Rodney Ellis Over a year ago

Yep. And for a connection string: var varName = '@System.Configuration.ConfigurationManager.ConnectionStrings["KeyName"]';

Roy Dictus · Accepted Answer · 2013-09-16 14:54:33Z

0

Client-side JavaScript can NOT read your config files. The only thing you can do is generate JavaScript code on the server that contains the value embedded, as you do in the example above (second code block).

answered Sep 16, 2013 at 14:54

Roy Dictus

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