Create and Retrieve Nested Objects with jQuery

By  on  

The ability to create and retrieve nested objects by objectified string path is incredibly useful.  Not only do you not need to do the manual string of object/property checks to avoid "{x} is not defined" errors, but if you create your method properly, you can also set an empty object in its given place (or namespace, some would call it.    Here's how you can add this functionality to the jQuery object.

The jQuery JavaScript

Since jQuery's philosophy is to use the same method for getting and setting, we'll be doing this same for creating and retrieving objects;  in this case, we'll use the obj method:

(function() {

	// Utility method to get and set objects that may or may not exist
	var objectifier = function(splits, create, context) {
		var result = context || window;
		for(var i = 0, s; result && (s = splits[i]); i++) {
			result = (s in result ? result[s] : (create ? result[s] = {} : undefined));
		return result;

	// Gets or sets an object
	jQuery.obj = function(name, value, create, context) {
		// Setter
		if(value != undefined) {
			var splits = name.split("."), s = splits.pop(), result = objectifier(splits, true, context);
			return result && s ? (result[s] = value) : undefined;
		// Getter
		else {
			return objectifier(name.split("."), create, context);


As with the MooTools alternative, the objectifier function is enough to handle both getting and setting, as well as doing both within a given context (existing object).  Here are a few examples of how you can use the new jQuery.obj method:

// Check for existence
var moduleNameExists = jQuery.obj("mynamespace.widget.moduleName"); // undefined

// Create the obj
jQuery.obj("mynamespace.widget.moduleName", { prop: 1 }); // mynamespace.widget.moduleName.prop returns 1

// Create an object on existing object
jQuery.obj("subnamespace.subModuleName", { someProp: 8 }, true, mynamespace.widget);
	// mynamespace.widget.subnamespace.subModuleName = { someProp: 8 }

As I work more with jQuery, both with its provided methods and other third party tools, accessing arbitrary objects by string and sometimes context allows me to avoid the dance of manual object and property existence checks.  Of course the essence of this script is really the objectifier method, which can be added to any framework or toolkit, but with a framework as popular as jQuery, why not just put it out there for everyone?

Recent Features

  • By
    Chris Coyier’s Favorite CodePen Demos II

    Hey everyone! Before we get started, I just want to say it's damn hard to pick this few favorites on CodePen. Not because, as a co-founder of CodePen, I feel like a dad picking which kid he likes best (RUDE). But because there is just so...

  • By
    CSS Animations Between Media Queries

    CSS animations are right up there with sliced bread. CSS animations are efficient because they can be hardware accelerated, they require no JavaScript overhead, and they are composed of very little CSS code. Quite often we add CSS transforms to elements via CSS during...

Incredible Demos

  • By
    Skype-Style Buttons Using MooTools

    A few weeks back, jQuery expert Janko Jovanovic dropped a sweet tutorial showing you how to create a Skype-like button using jQuery. I was impressed by Janko's article so I decided to port the effect to MooTools. The XHTML This is the exact code provided by...

  • By
    Duplicate the jQuery Homepage Tooltips

    The jQuery homepage has a pretty suave tooltip-like effect as seen below: The amount of jQuery required to duplicate this effect is next to nothing;  in fact, there's more CSS than there is jQuery code!  Let's explore how we can duplicate jQuery's tooltip effect. The HTML The overall...


  1. Any chance that there is a demo or functional example of this available? I’m trying to use this to create nested dropdown boxes based on jQuery UI’s nested menu, and I’m having some difficulty understanding how to apply the objectifier function.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!