Using string variable as a json object name

Question

I have a dynamic string variable created by UI (valkey in below code) and I want to use that variable as a JSON key to get a value from TestObj which is a JSON object. But an attempt with the following code has returned an error.

 var valkey=$('#cityfrm').val()+"_TO_"+$('#cityto').val();

 if($('#cityfrm').val()!="NIL" || $('#cityto').val()!="NIL")   
   {

    $.each(TestObj.valkey, function() { 
        var durn=this.duration;
        var prc=this.price;
        var curlegs=this.legs;
        // updating ui
     });
   }

I appreciate any help.

While the answer below technically answers this question specifically I'd like to point out that this is really very basic javascript. I strongly suggest that you actually learn javascript before trying to tackle something like this. This question is like someone writing code in C and asking how to get the value form a pointer — slebetman
– slebetman, Commented Mar 14, 2013 at 6:57

Arun P Johny · Accepted Answer · 2013-03-14 06:10:13Z

2

TestObj.valkey will look for the key valkey in TestObj, which is undefined in your case that is why you are getting the error.

If you want to look for a key from a variable you need to use the syntax TestObj[valkey].

Ex:

var valkey=$('#cityfrm').val()+"_TO_"+$('#cityto').val();

if($('#cityfrm').val()!="NIL" || $('#cityto').val()!="NIL") {
    $.each(TestObj[valkey], function() { 
        var durn=this.duration;
        var prc=this.price;
        var curlegs=this.legs;
        // updating ui
    });
}

edited Mar 14, 2013 at 6:10

answered Mar 14, 2013 at 6:03

Arun P Johny

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