Javascript: Adding an element to an associative array

Question

I am trying to build a menu for use with jQuery contextMenu. It will be dynamic. I'm trying to add one element to it but it's reporting the error 'undefined is not a function'.

My menu works without the code that is trying to push the new element.

//Build the menu
var menudata = {
    "Download Call": {name: "Download_Call"},
    "sep1": "---------",
    "View Comments": {name: "View_Comments"}
};

menudata.push (
    {
        "test": {name: "test"}
    }
);

//Generate the context menu
$.contextMenu({
    selector: '.context-menu-one',
    trigger: 'left',
    callback: function(key, options) {
        var m = "clicked: " + key + " on " + $(this).attr('class');
        alert(m);
    },
    items: menudata
});

I'm assuming it's a datatype issue but any help would be greatly appreciated.

Note that associative arrays (yes, in js objects implements the concept of associative arrays but that's just a naming issue nothing fundamental) in any language is supposed to be unordered. By happy accident IE, Firefox, Safari and Chrome all retain creation order. However, this is never guaranteed in any specification. And indeed the ECMA specification specifically states that order is not retained. Any code that expects an object's order to be retained like the one you have should be considered buggy. — slebetman
– slebetman, Commented Jul 29, 2014 at 15:21
One should especially note that the fastest/most efficient implementation of associative arrays - a hash table (or hash tree) has pseudo-random order depending on the result of the hashing function over the key. — slebetman
– slebetman, Commented Jul 29, 2014 at 15:23

antyrat · Accepted Answer · 2014-07-29 15:12:59Z

4

Object's doesn't have push method. Only Array's have. You can try this instead:

menudata[ "test" ] = {name: "test"};

answered Jul 29, 2014 at 15:12

antyrat

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2 Comments

Jason Over a year ago

or dot syntax: menudata.test = {name: "test"};

antyrat Over a year ago

@Jason yes, but as I can see from OP code he have some Object properties with space char in name so better is to use brackets in this case.

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