Jquery, Javascript: Push a 2D array

Question

Would like to create array like this:

track[divID][wrapID]

I couldn't use track[divID][wrapID] = wrapID

cos some more will be added to 2nd dimension in another loop like this: track[divID][wrapID,wrapID2]

var track =[];
$("div").each(function() {

                        var wrapID = $(this).parent().attr('id')
                        var divID  = $(this).attr('id')

                        track[divID].push(wrapID)

                                                    });

the Error is "Uncaught TypeError: Cannot read property 'push' of undefined "

What did I do wrong ? Many thanks.

FYI track[divID][wrapID,wrapID2] would just evaluate to track[divID][wrapID2] due to how the comma operator works — Patrick Evans
– Patrick Evans, Commented Dec 30, 2014 at 17:09

VisioN · Accepted Answer · 2014-12-30 17:06:25Z

5

You haven't created a new array for the second dimension:

track[divID] = [];
track[divID].push(wrapID);

Otherwise track[divID] is undefined and doesn't have push method.

answered Dec 30, 2014 at 17:06

VisioN

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1 Comment

Colin DeClue Over a year ago

I'd suggest track[divID] = track[divID] || [] to make sure he doesn't overwrite an existing array, since he says he's going to add more.

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