我可以通过回调添加getJSON的done（）函数吗？

Question

On this code:

 function hello(){
     alert("hello");
 }
 function hi(){
     alert("hi");
 }

 jQuery.getJSON('foo.bar',function(data){
     if (data.foobar) {
         this.done(hello);
     }
     alert('callback done');
 }).done(hi);

and assuming this returns from foo.bar

{"foobar":true}

I like to have the alerts in this order:

1. callback done
2. hi
3. hello

But I can not add a done() -function in the success -callback.

Have you a hint how I add a done() -function inside of the success -callback?

Answer 1

The jqXHR object is the third argument to the callback function:

jQuery.getJSON('foo.bar', function(data, textStatus, jqXHR) {
    if (data.foobar) {
        jqXHR.done(hello);
    }
    alert('calback done');
}).done(hi);

Answer 2

I don't think you should be trying to combine callbacks and done() handlers in the first place, let alone interweaving them like this. Just use one done() handler:

jQuery.getJSON('foo.bar').done(function (data) {
    hi();
    if (data.foobar) {
        hello();
    }
});

Or if you are worried about a failure in hi() preventing the rest from executing, you can pass them to done() separately:

jQuery.getJSON('foo.bar').done(hi, function (data) {
    if (data.foobar) {
        hello();
    }
});