8

So I have some javascript class and in one method I use jQuery to bind function to click event. And within this function I need to call other methods of this class. In usual js function I did it through "this.method_name()", but here, I guess, jQuery redefines "this" pointer.

Anurag
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Tyth
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2 Answers2

20

jQuery doesn't redefine the this pointer, but that's how JavaScript functions work in general. Store a reference to the this pointer under a different name, and use that.

var self = this;
$("selector").click(function() {
    self.method_name();
});

See this answer for more approaches.

Community
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Anurag
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  • @Tramp - you're welcome. But note that this is still a hacky approach. Instead use `jQuery.proxy`, or even better the `bind` method that is now included in the standard. If it's not available in some browser, it's easy to define one - http://stackoverflow.com/questions/3018943/javascript-object-binding-problem-inside-of-function-prototype-definitions/3019431#3019431 – Anurag Jul 29 '10 at 17:29
  • Maybe this the "best approach" but I think its the most readable and less code. – John Magnolia Dec 08 '12 at 13:12
3

There are a few different ways to do this.

Anurag has a perfect example of one.

Two other ways are the jQuery Proxy class (Mentioned in other answers) and the 'apply' function

Now lets create an object with click events:

var MyObj = function(){

this.property1 = "StringProp";

// jQuery Proxy Function
$(".selector").click($.proxy(function(){

  //Will alert "StringProp"
  alert(this.property1);
// set the 'this' object in the function to the MyObj instance


},this));


//Apply Function
//args are optional
this.clickFunction = function(arg1){
    alert(this.property1);
};

$(".selector").click(this.clickFunction.apply(this,"this is optional"));


};
CPettit
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