Get array/object value by referencing the object and key as string

Question

I'm trying to get the value of an array/object by passing KEY that is splitted from data attribute.

Please take a look of this whole scenario.

1st - passing the data-* to an element

 <a data-action='{"content":"content.login"}' ... >val</a>

2nd - get the data attribute value

 var da = ele.data("action");
 var c = da.content;
 var c0 = c.split('.')[0];
 var c1 = c.split('.')[1];

4th - array/obj

 var content = {
    login : "..."
 };

3rd - trying to get the val of array

 console.log(c0[c1]);

result - undefined

Can someone give me the solution so that it logs the exact value of content.login by simply calling c0[c1]?

c0 suposed to be a string like "content", right? So this can't work c0[c1]... — DontVoteMeDown
– DontVoteMeDown, Commented Jan 22, 2015 at 10:42

Spokey · Accepted Answer · 2015-01-22 10:58:03Z

1

You can call the variable using the string by passing it to window: window[c0][c1]

var content = {
   login : "awesome"
};

var data = $('div').data('data');
var c = data.content;

var c0 = c.split('.')[0];
var c1 = c.split('.')[1];

console.log(c0, c1);

alert(window[c0][c1]); 
   // translates to window['content']['login'] => calls content.login

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<div data-data='{"content":"content.login"}'></div>

NOTE: If you are in a function closure you can use this instead of window.

edited Jan 22, 2015 at 10:58

answered Jan 22, 2015 at 10:50

Spokey

11k2 gold badges31 silver badges44 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Anand Pilania Over a year ago

its working great. But please can u explain the concept behind window.

Spokey Over a year ago

Window is an object that contains DOM elements, functions/methods, events and the variables you create. It's basically the parent of everything. You can find what it has here

Spokey Over a year ago

When you for example call the variable c the you are actually calling window.c but the window part is not mandatory anymore since it's build in with the browser.

Phil · Accepted Answer · 2015-01-22 10:44:21Z

0

You're doing assignment of a single element rather than of array:

var c0 = c.split('.')[0]; //Take 1st element of array

So you can't try to access element of array like you have:

c0[c1]

Just print c0.

answered Jan 22, 2015 at 10:44

Phil

5042 silver badges21 bronze badges

Collectives™ on Stack Overflow

Get array/object value by referencing the object and key as string

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related