javascript access object with variable name

Question

I am trying to access an object but the name is variable. So: I have object41, object42 and object43. I want to access object42.

id = 42;

something like this:

object+id.function();

I have searched and found how to assign objects with variable names and how to access properties with variable names but I can't figure out how to access objects with variable names.

Is this something obvious that I am missing?

Try for object[id].function(). If you have at least 42 related objects, use an object to organize them, rather than as dispersed variables. Related: Javascript dynamic variable name — Jonathan Lonowski
– Jonathan Lonowski, Commented Aug 24, 2014 at 22:02

jstricker · Accepted Answer · 2014-08-24 21:58:24Z

2

If these objects are global, you can access them via the window object, and then call your function on the resulting object.

var id = 42;

window["object" + id].function();

answered Aug 24, 2014 at 21:58

jstricker

2,1981 gold badge30 silver badges45 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

jstricker Over a year ago

@elclanrs I wouldn't personally write my code this way, but this is still the answer to the actual question asked.

tgurske Over a year ago

Didn't work for me: TypeError: window[("object" + id)] is undefined.

tgurske Over a year ago

If I hard code it like: object42.function();, it works fine. So, I assumed the scope was ok.

jstricker Over a year ago

@tgurske How do you have your variable object defined? What I suggested will only work if it is a global.

tgurske Over a year ago

marker42 = new google.maps.Marker({ position: markerPos42,map:map});

|

QIKHAN · Accepted Answer · 2014-08-30 03:02:14Z

0

Try using eval

// Sample object
function X(id) {
    this.value1 = "A" + id;
    this.function = function f(value){
        alert(value);
    };

   return this;
}

// n number of object created
var object1 = new X(1);
var object2 = new X(2);

// iterate over all object
for (i=1; i<=2; i++) {
    var expr = "object"+i+".function(object"+i+".value1)";
    eval(expr);    
}

Here a jsfiddle : demo

answered Aug 30, 2014 at 3:02

QIKHAN

2742 silver badges4 bronze badges

Collectives™ on Stack Overflow

javascript access object with variable name

2 Answers 2

6 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

6 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related