Pushing data to JSON object javascript

Question

I want to push this object to a JSON array

var obj =  {'x':21,'y':32,'z':43};

Since my JSON key:value comes dynamically , I cant access using keys , so i used the loop method .

var str = {xA : []}; //declared a JSON array

for (var key in obj) {

    alert(' name=' + key + ' value=' + obj[key]);

     str.xA.push({
         key :   obj[key]
     })
}

When i alert the values I am getting the keys and values properly, but when I am pushing it to the array my key is always coming as 'key' instead of the actual key like x, y,z as in the code.

Any help is appreciated.

Please, don't use the word "JSON", there's no JSON at all here. — Denys Séguret
– Denys Séguret, Commented Sep 30, 2013 at 18:43

ThiefMaster · Accepted Answer · 2013-09-30 18:43:20Z

10

The literal notation does not allow expressions for keys. You need to create the object first and then use the bracket notation instead:

var tmp = {};
tmp[key] = obj[key];
str.xA.push(tmp);

answered Sep 30, 2013 at 18:43

ThiefMaster

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PSL · Accepted Answer · 2013-09-30 18:43:57Z

3

You need to use [] notation, otherwise always the key name will be key and not the value of the key.

 str.xA.push({
     key :   obj[key]
 })

to

   var tmp= {};
   tmp[key] = obj[key]
   str.xA.push(tmp)

answered Sep 30, 2013 at 18:43

PSL

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