Javascript: Accessing properties on multidimensional array

Question

I have an array that loads an array with properties at a certain index:

var hotspotLocationsTextAndAudio [];

var myArr = [
[{x:10, y:40, filename:"test",  text:"test"}],
[{x:50, y:60, filename:"test2", text:"test2"}]
];

hotspotLocationsTextAndAudio[window.IDNum] = myArr;

To access a property at a certain index of hotspotLocationsTextAndAudio (my case being what window.IDNum equals) at an index of the array inside that (0) and a certain property, I thought I just needed to do the following:

alert(hotspotLocationsTextAndAudio[window.IDNum][0].x);

That returns undefined.

Is hotspotLocationsTextAndAudio[window.IDNum] = arr; supposed to be hotspotLocationsTextAndAudio[window.IDNum] = myArr;? — Samsquanch
– Samsquanch, Commented Jul 8, 2014 at 21:21
Yes, thanks. Just edited. It was being passed through a function before a posted the code, and forgot to change that. — Chewie The Chorkie
– Chewie The Chorkie, Commented Jul 8, 2014 at 21:52

Samsquanch · Accepted Answer · 2014-07-08 21:32:12Z

1

Assuming the code you're actually using is this:

var hotspotLocationsTextAndAudio [];

var myArr = [
  [{x:10, y:40, filename:"test",  text:"test"}],
  [{x:50, y:60, filename:"test2", text:"test2"]}
];

hotspotLocationsTextAndAudio[window.IDNum] = myArr;

The alert code you'll need is:

alert(hotspotLocationsTextAndAudio[window.IDNum][0][0].x);

The reason being that you wrapped your objects in [], putting them in an array.

Or, in order to have your original alert working, you'll need to change myArr to this:

var myArr = [
  {x:10, y:40, filename:"test",  text:"test"},
  {x:50, y:60, filename:"test2", text:"test2"}
];

edited Jul 8, 2014 at 21:32

answered Jul 8, 2014 at 21:25

Samsquanch

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Xspirits · Accepted Answer · 2014-07-08 21:25:27Z

0

This works for me: http://jsfiddle.net/Ku2tQ/

var hotspotLocationsTextAndAudio = [];

var myArr = [
[{x:10, y:40, filename:"test",  text:"test"}],
[{x:50, y:60, filename:"test2", text:"test2"}]
];

alert(myArr[1][0].x);

First of all hotspotLocationsTextAndAudio is an empty array, and you never push/merge myArr to it. So trying to access a nested value of an empty array, will fail.

arr, is also never defined.

If possible, keep it simple and try avoiding nested array with too much deep.

answered Jul 8, 2014 at 21:25

Xspirits

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