Combine a variable with variable value in Javascript

Question

I am trying to do something like this in Angular javascript (a simplified code):

var modelName = "date";

if (attrs.hasOwnProperty('today')) {
   scope.modelName = new Date();
}

In the above, I actually want scope.modelName to become scope.date automatically. How can I parse the modelName variable to its value?

You mean scope[modelName] = new Date() ?

atondelier
– atondelier

2014-03-26 20:01:09 +00:00
Commented Mar 26, 2014 at 20:01 — atondelier
– atondelier, Commented Mar 26, 2014 at 20:01

Pete · Accepted Answer · 2014-03-26 20:00:46Z

8

You can access properties of objects using square brackets.

var modelName = "date";

if (attrs.hasOwnProperty('today')) {
   scope[modelName] = new Date();
}

answered Mar 26, 2014 at 20:00

Pete

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11 Comments

feeela Over a year ago

MDN: "Properties of JavaScript objects can also be accessed or set using a bracket notation."

Neel Over a year ago

yeah... that seems about right. However, in Angular, the new Date() is not updating the ng-model box when I have it as scope[modelName]. However if I type it directly as scope.date then it works.

Pete Over a year ago

Could you make a jsFiddle? I'll look over it.

Neel Over a year ago

I just tried it in jsFiddle and it works there. It doesnt work in my code only. So I need to review my code and see if I had done a mistake anywhere. Thank you so much for telling me how to access properties of objects. That was exactly what I was looking for. Thanks heaps.. :)

Neel Over a year ago

@user2708395 I found out why it wasnt working on my code. It works if I have modelName = "date" but it doesnt work if the modelName = "formData.date". I have a jsfiddle here that shows a sample. Is this not allowed? Here is the jsfiddle link: jsfiddle.net/6fJdk/2

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