how to get json objects attribute using javascript

Question

Beginner at both JSON and javascript. I need a way to return the key subAttributeOne it self from a list of object instead of his value.

Following is example of a list,

var list = 
[
   {
   attribute1: "value",
   attribute2:[{subAttributeOne:"value",subAttributeTwo:"value"},{}]
   },
   //other objects
   {..}
]

I have tried following,

list[0].attribute2[1].subAttributeOne

it returns value but the result I need is subAttributeOne

Err… You already know you're looking for the string "subAttributeOne"… so what's there to look up in the array? It's not very clear what you're trying to accomplish. — deceze
– deceze ♦, Commented Aug 24, 2016 at 8:56

gianlucatursi · Accepted Answer · 2016-08-24 08:55:43Z

5

With this:

Object.keys(list[0].attribute2[0])

you get

['subAttributeOne', 'subAttributeTwo']

answered Aug 24, 2016 at 8:55

gianlucatursi

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Community · Accepted Answer · 2017-05-23 12:16:42Z

3

If you want keys from an object you can use object.keys that will bring back all the keys, but to define its position, in your case you can use like below:

Object.keys(list[0].attribute2[1])[0]

But the [0] doesn't work like an index because properties order in objects is not guarantee in JavaScript. To learn more about this I recommand you to read about : Does JavaScript Guarantee Object Property Order?

In this link you will find the definition of an Object from ECMAScript Third Edition:

4.3.3 Object

An object is a member of the type Object. It is an unordered collection of properties each of which contains a primitive value, object, or function. A function stored in a property of an object is called a method

edited May 23, 2017 at 12:16

CommunityBot

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answered Aug 24, 2016 at 9:07

Simo

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3 Comments

gianlucatursi Over a year ago

This working only because subAttributeTwo is bigger then subAttributeOne. The order of the keys is alphabetically

deceze Over a year ago

@t.gian18 The order is arbitrary, i.e. there is none.

Xotic750 Over a year ago

stackoverflow.com/questions/5525795/…

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