Question

190

How to get a JSON value from a variable

rated 0 times [ 196] [ 6] / answers: 1 / hits: 19351 / 13 Years ago, fri, may 13, 2011, 12:00:00

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.

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parker

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answered 13 Years ago irvinjovannix · Accepted Answer

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