javascript creating object key

Question

Let's say I have this:

var ObjectKey = "06.2012";

It's a string that represents the month. I want to use this value as the key of a new object. I have

TheObject = {ObjectKey: null};

But when I go to the console, instead of the TheObject having a key named 06.2012, it has a key named ObjectKey.

How do I create a key that has the name of a string that I create at runtime?

Thanks.

Gabriele Petrioli · Accepted Answer · 2012-06-11 19:23:17Z

9

To use variable as the key you need to use the [] syntax..

var ObjectKey = "06.2012";
TheObject = {};
TheObject[ObjectKey] = null;

answered Jun 11, 2012 at 19:23

Gabriele Petrioli

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Gabriele Petrioli Over a year ago

@Kranklin chuckle.. 17 to be exact .. (and James Allardice was second..) :)

Tschallacka · Accepted Answer · 2012-06-11 19:23:56Z

-7

quick and dirty:

eval('TheObject = {'+ObjectKey+':null};');

but it's really dirty and susceptible to errors(very suceptible...)

answered Jun 11, 2012 at 19:23

Tschallacka

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sparebytes Over a year ago

We should note this method could potentially open your website up for attacks. If the ObjectKey is given from the user, e.g. a form variable, then the user could inject JS code to do anything.

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