Is there a way to keep this referenced in a callback?

Hard to explain with words, but here is what I quite often have in my code:

var self_reference;
self_reference = this;

$(selector).bind('event', function() {
  self_reference.someFunction();
});

Is there a way to write that without the need of a temporary variable (self_r开发者_StackOverflow中文版eference here) ?

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No, there isn't.

this is context sensitive and this will be a different object inside the callback function. Unless you copy it somewhere it will be lost.

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$(selector).bind('event', (function() {
  this.someFunction();
}).bind(this));

Function.prototype.bind is an ES5 extension to function.

You could use _.bind as a cross browser alternative or use $.proxy.

$(selector).bind('event', (_.bind(function() {
  this.someFunction();
}, this));

$(selector).bind('event', ($.proxy(function() {
  this.someFunction();
}, this));

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You could take a look at the jQuery proxy function.

e.g.

$.getJSON(url, $.proxy(function()
{
  // this has now got the desired context
}, this));