Dynamically assign name to object array

Question

I have a javascript issue.
If I have an object array objAr, the object consists of id,name.

If I was to access objAr[0].id it returns the id value of the first object. What would happen if the object is dynamic and therefore I do not know what it consists of, is there a way to dynamically call the Object attribute?

Currently I am creating another array

var theArr = new Array("id", "name");

and call:

objAr[0].theArr[0] instead of objAr[0].id.

Is there a way to do this better using Javascript?

http://stackoverflow.com/questions/684672/loop-through-javascript-object — Nishant Jani, Feb 11 '13 at 12:09

Craig Taub · Accepted Answer · 2013-02-11T12:13:45.557

0

With Javascript you can call all of the attributes in an object without knowing the keys.
See below:

for(key in objAr[0]) {
   console.log(objAr[0][key]);
}

If you just wanted the first attribute you could run:

for(key in objAr[0]) {
   var attFirst = objAr[0][key];
   break;
}

Additionally for the JS array you could have used square brackets.

var theArr = ["id", "name"];

hope that helps

edited Feb 11 '13 at 12:13

answered Feb 11 '13 at 12:08

Craig Taub

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Remember the `if (objAr[0].hasOwnProperty(key))` check to avoid iterating over the...'inherited'/'native' properties of the object (unless you really want to). – David Thomas Feb 11 '13 at 12:10
The _"first attribute"_ sample can do without the `for` loop, I'd suggest using a `if`, instead. – Cerbrus Feb 11 '13 at 12:11
this worked, useful to know additional stuff thanks – Feb 11 '13 at 12:13

score 0 · Answer 2 · answered Feb 11 '13 at 12:12

0

In javascript you can always use the "array notation" in place of the "dot notation"

So these 2 lines are the same

objAr[0].id
objAr[0]["id"]

answered Feb 11 '13 at 12:12

Jamiec

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Dynamically assign name to object array

2 Answers2