Question

suppose I have {"data": {"243232": {"id": "testid","name": "test" } }}

so when I do

var a = data.243232.id;
alert(a); // it gives me testid.

but when I do like

    var c = 243232; 
    var d = data.c.id;
    alert(d) //it gives as undefined.

so how to get correct value when i alert d in above case thanks.

Answer 1

Use the other notation var a = data['243232'].id

Remember all objects in JS are really just associative arrays.

Object keys just a variable in js and thus require proper naming

the variable naming rules are.

• The first character must be a letter
  (either uppercase or lowercase) or an
  underscore (_), or a dollar sign ($).
• Subsequent characters can be letters,
  numbers, underscores, or dollar signs
  in JavaScript Variables.
• The JavaScript Variable name can’t be
  a reserved word of JavaScript, see
  details of JavaScript Reserved
  Characters

JSON normally uses an eval() function to turn the string into a data-structure. This allows for incorrect keys. If you want to reference an improper key, you need to use the associative array method.

As for you addition

var c = 243232; 
var d = data[c].id;
alert(d) //it gives as undefined.

Will work