[untitled]

7 comments

Don't do it. Do this instead:

var self = this; function(){ self.foo() }

This.

heh.

DCoder15 anni fa

I don't think you're doing this right. The first .then receives a function, but the second .then executes function.apply at construction time and receives only its result (null) as the callback.

Also, after understanding what's going on, existing solutions might be better than rolling your own: http://api.jquery.com/jQuery.proxy/ .

joske215 anni fa

In ES5 you have Function.prototype.bind that returns a new function with this bound to whatever you want. You can also pass extra default arguments. On older browsers you could use es5-shim for this functionality.

See https://developer.mozilla.org/en/JavaScript/Reference/Global...

sisk15 anni fa

I do the following a lot (setTimeout as a relevant example):

  setTimeout(
    (function(scope){
      return function(){scope.fire();};
    })(this), 500
  );

The short explanation is you return a function from an immediately-executing anonymous function that takes the current scope as a parameter.

thomasdavis15 anni fa

I have used this method many times before also, added it as an alternative implementation on the site.

joetyson15 anni fa

You can also create a 'bind' that returns a function that when called applies the context you desire.

  function bind(fn, selfObj) {
     return function() {
        return fn.apply(selfObj || window);
     };
  }

  callback = bind(function(){ alert(this.hello); }, this);

travisglines15 anni fa

Solid example, I frequently find myself saying something to the effect of:

    var this_autobot = this;
    async_function = function(){
      this_autobot.fire();
    }

joshd15 anni fa

I usually use `that`. I've seen examples use `self`, but that could potentially conflict with `window.self` in the browser.

    var that = this;
    return function(){
      that.fire();
    }

[deleted]15 anni fa

Johngibb15 anni fa

I've used $this before

ronnier15 anni fa

Is "for noobs" really necessary?