javascript - Is it possible to prototype on window or window.location? - Stack Overflow

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I want to write a query parsing method that would belong to the location class, but am not having any luck with

window.location.prototype

or

window.prototype

My goal is to do something along the lines of:

window.location.prototype.parseQuery = function(key){
   //run a test on this.search to see if it contains key and return the val
}

Is window immutable? or am I just not referencing it correctly?

TIA

I want to write a query parsing method that would belong to the location class, but am not having any luck with

window.location.prototype

or

window.prototype

My goal is to do something along the lines of:

window.location.prototype.parseQuery = function(key){
   //run a test on this.search to see if it contains key and return the val
}

Is window immutable? or am I just not referencing it correctly?

TIA

• javascript

Share Improve this question Follow asked Sep 22, 2012 at 7:12 Yevgeny SimkinYevgeny Simkin 28.5k4141 gold badges145145 silver badges243243 bronze badges

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3 Answers 3

Sorted by: Reset to default 3

You don't need the prototype when the object already exists and there's only one of them. You can just add a method directly to the object.

window.parseQuery = function() { /* your code here */};

or

window.location.parseQuery = function() { /* your code here */};

Also, the window object is the global object in a browser so any global function is already a method on the window object.

You should add the property directly on window.location

window.location.parseQuery = function(key){
   //run a test on this.search to see if it contains key and return the val
}

prototype is the property of Function, while window.location is not a function.

Bah! should have run some more tests before asking...

The answer is Window.prototype. Works in Chrome, haven't tested elsewhere yet.

as per the answers given, it would seem that there's no need to prototype on Window, given that it's a single global object. So here's my solution...

window.location.getQueryItem = function(key){
            if(this.search.indexOf(key + "=") != -1){
                reg = new RegExp(key + '=(.*?)(\&|$)', 'i');
                return this.search.match(reg)[1];
            }
                    return null;
        }

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