How to create multidimensional array

var numeric = [    ['input1','input2'],    ['input3','input4']];numeric[0][0] == 'input1';numeric[0][1] == 'input2';numeric[1][0] == 'input3';numeric[1][1] == 'input4';var obj = {    'row1' : {        'key1' : 'input1',        'key2' : 'input2'    },    'row2' : {        'key3' : 'input3',        'key4' : 'input4'    }};obj.row1.key1 == 'input1';obj.row1.key2 == 'input2';obj.row2.key1 == 'input3';obj.row2.key2 == 'input4';var mixed = {    'row1' : ['input1', 'inpu2'],    'row2' : ['input3', 'input4']};mixed.row1[0] == 'input1';mixed.row1[1] == 'input2';mixed.row2[0] == 'input3';mixed.row2[1] == 'input4';

http://jsfiddle.net/z4Un3/

And if you're wanting to store DOM elements:

var inputs = [    [        document.createElement('input'),        document.createElement('input')    ],    [        document.createElement('input'),        document.createElement('input')    ]];inputs[0][0].id = 'input1';inputs[0][1].id = 'input2';inputs[1][0].id = 'input3';inputs[1][1].id = 'input4';

Not real sure how useful the above is until you attach the elements. The below may be more what you're looking for:

<input text="text" id="input5"/><input text="text" id="input6"/><input text="text" id="input7"/><input text="text" id="input8"/>    var els = [    [        document.getElementById('input5'),        document.getElementById('input6')    ],    [        document.getElementById('input7'),        document.getElementById('input8')    ]];    els[0][0].id = 'input5';els[0][1].id = 'input6';els[1][0].id = 'input7';els[1][1].id = 'input8';

http://jsfiddle.net/z4Un3/3/

Or, maybe this:

<input text="text" value="4" id="input5"/><input text="text" value="4" id="input6"/><br/><input text="text" value="2" id="input7"/><input text="text" value="4" id="input8"/>var els = [    [        document.getElementById('input5'),        document.getElementById('input6')    ],    [        document.getElementById('input7'),        document.getElementById('input8')    ]];var result = [];for (var i = 0; i < els.length; i++) {    result[result.length] = els[0][i].value - els[1][i].value;}

Which gives:

[2, 0]

In the console. If you want to output that to text, you can result.join(' ');, which would give you 2 0.

http://jsfiddle.net/z4Un3/6/

EDIT

And a working demonstration:

<input text="text" value="4" id="input5"/><input text="text" value="4" id="input6"/><br/><input text="text" value="2" id="input7"/><input text="text" value="4" id="input8"/><br/><input type="button" value="Add" onclick="add()"/>// This would just go in a script block in the headfunction add() {    var els = [        [            document.getElementById('input5'),            document.getElementById('input6')        ],        [            document.getElementById('input7'),            document.getElementById('input8')        ]    ];    var result = [];    for (var i = 0; i < els.length; i++) {        result[result.length] = parseInt(els[0][i].value) - parseInt(els[1][i].value);    }    alert(result.join(' '));}

http://jsfiddle.net/z4Un3/8/

Quote taken from Data Structures and Algorithms with JavaScript

The Good Parts (O’Reilly, p. 64). Crockford extends the JavaScript array object with a function that sets the number of rows and columns and sets each value to a value passed to the function. Here is his definition:

Array.matrix = function(numrows, numcols, initial) {    var arr = [];    for (var i = 0; i < numrows; ++i) {        var columns = [];        for (var j = 0; j < numcols; ++j) {            columns[j] = initial;        }        arr[i] = columns;    }    return arr;}

Here is some code to test the definition:

var nums = Array.matrix(5,5,0);print(nums[1][1]); // displays 0var names = Array.matrix(3,3,"");names[1][2] = "Joe";print(names[1][2]); // display "Joe"

We can also create a two-dimensional array and initialize it to a set of values in one line:

var grades = [[89, 77, 78],[76, 82, 81],[91, 94, 89]];print(grades[2][2]); // displays 89

Declared without value assignment.

2 dimensions...

var arrayName = new Array(new Array());

3 dimensions...

var arrayName = new Array(new Array(new Array()));