Is it possible to add methods to JQuery's promise object?

Question

I want to add a catch method to JQuery\'s promise object so I don\'t have to type the following every time:

.then(null,function(dat         


        

Answer 1

You can create your custom then

$.Deferred().prototype.customthen = function(){
  $.Deferred().prototype.then.call(this, null, ,function(data){
    // handle error
    return $.Deferred().resolve().promise();
  })
}

You have added a new function named customthen to the prototype. So, this new function is available in all instances.

Now, you can use it as follows

.customthen();