javascript multi dimensional array

Question

I am trying to create a multidimentional arrya in javascript where I can add items in the following fashion:

var foo = {
 "Internal": {
 "0":
 {
 "pic_id":"15011",
 "description":"Picture of a cpu",
 "localion":"img.cloudimages.us/2012/06/02/mycpu.png",
 "type":"png"
 },
 "1":{
 "pic_id":"15011",
 "description":"Picture of a cpu",
 "localion":"img.cloudimages.us/2012/06/02/mycpu.png",
 "type":"png"
 }
 },
 "External": 
 {
 "0":
 {
 "pic_id":"15014",
 "description":"Picture of a cpu",
 "localion":"img.cloudimages.us/2012/06/02/mycpu.png",
 "type":"png"
 }
 }
};

but I don't know how to get my value into the main category. I got the following code

vm.classificationNames = [,];

 for (var i = 0; i < vm.classificationNames.length; i++) {
 vm.allGroupsInClassifications.push(vm.classificationNames[i]);
 }
 for (var i = 0; i < data.length; i++) {
 var item = data[i];
 if (item.classification != null) {
 } else if (item.classification == null) {
 vm.classificationNames['Internal'][item];
 }
 }
 console.log(vm.classificationNames);

I also tried to use the following without any luck:

 vm.classificationNames['Internal'].push(item);

Does anyone know what I'd be doing wrong? thanks for the help in advance.

• Peter-Paul: Also you say it's an array, but the object you show makes it seem that the "0" and "1" aren't array elements ( { } for objects vs [ ] for arrays)

Answer 1

Thats because its an object, not an array. Change your inner object to an array and push will work

var foo = {
 "Internal": [ // <--- Note the square braces
 {
 "pic_id": "15011",
 "description": "Picture of a cpu",
 "localion": "img.cloudimages.us/2012/06/02/mycpu.png",
 "type": "png"
 },
 {
 "pic_id": "15011",
 "description": "Picture of a cpu",
 "localion": "img.cloudimages.us/2012/06/02/mycpu.png",
 "type": "png"
 }
 ], // <--- Note the square braces
 "External": [ // <--- Note the square braces
 {
 "pic_id": "15014",
 "description": "Picture of a cpu",
 "localion": "img.cloudimages.us/2012/06/02/mycpu.png",
 "type": "png"
 }
 ] // <--- Note the square braces
};
foo['Internal'].push(item);

Answer 2

Try iterating over the dictionary with

for(var key in vm.classificationNames) {
 var entry = vm.classificationNames[entry];
 /*....*/