Is it possible to find all defined Javascript objects which have a special pattern?

Question

Is it possible in JavaScript (Or library JQuery) to find all (global) objects which have a given pattern ?

For example:

objekt_1
objekt_2 //Javascript objects

function find_objects() {
     return ....; //return all objects that start with "object"-prefix
}

why would you want to do that?if you create these objects, it makes more sense to put them inside an array. — mpm, Mar 31 '14 at 09:50
see this http://stackoverflow.com/questions/8409577/get-all-the-objects-dom-or-otherwise-using-javascript — web-nomad, Mar 31 '14 at 09:50
@mpm Very good consideration. I want it because I'm not controll all the javascript code. — Tony, Mar 31 '14 at 09:56

Ionică Bizău · Accepted Answer · 2014-03-31T09:58:23.033

Yes. If they are global, they are stored in window object. Then you just need to filter them:

function find_objects() {
    var objs = [];
    for (var k in window) {
        var cVariable = window[k];
        if (/^objekt/.test(k) && typeof cVariable === "object") {
             objs.push(cVariable);
        }
    }
    return objs;
}

Demo:

> function find_objects() {
    var objs = [];
    for (var k in window) {
        if (/^objekt/.test(k) && typeof window[k] === "object") {
             objs.push(window[k]);
        }
    }
    return objs;
}
undefined
>find_objects()
[]
>var objekt_1 = {a: 1}
undefined
>find_objects()
[Object]

JSBIN

score 1 · Answer 2 · answered Mar 31 '14 at 09:50

1

Yes.

Global variables in javascript are actually elements of the window object, so you can do this:

for(var i in window) {
    var ret = [];
    if(i.substr(0,7) == 'object_') ret.push(i);
    return ret;
}

answered Mar 31 '14 at 09:50

Benubird

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score 1 · Answer 3 · answered Mar 31 '14 at 09:50

As they're globals, they're properties on the global object, which is referenced via the window variable on browsers. So you may be able to find them with a for-in loop:

var key;
for (key in window) {
    // Examine `key` here, it's a string; if it matches, do
    // something with `window[key]`, which is the value for that variable
}

Is it possible to find all defined Javascript objects which have a special pattern?

3 Answers3