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In Solution 1, sub jQuery, I could not understand this line: If you use any other jQuery AJAX method, such as $.get, $.getJSON, etc., you have them to $.ajax. (Yes, I realize my nick is a tad ironic in this case)
@gibberish: Mmmh, I don't know how it can be made clearer. Do you see how foo is called and a function is passed to it (foo(function(result) {....});)? result is used inside this function and is the response of the Ajax request. To refer to this function, the first parameter of foo is called callback and assigned to success instead of an anonymous function. So, $.ajax will call callback when the request was successful. I tried to explain it a bit more.
The Chat for this question is dead so I'm not sure where to propose outlined changes, but I propose: 1) Change the synchronous part to a simple discussion of why it's bad with no code example of how to do it. 2) Remove/merge the callback examples to only show the more flexible Deferred approach, which I think may also be a little easier to follow for those learning Javascript.
@Jessi: I think you misunderstood that part of the answer. You cannot use $.getJSON if you want the Ajax request to be synchronous. However, you should not event want the request to be synchronous, so that doesn't apply. You should be using callbacks or promises to handle the response, as it is explained earlier in the answer.
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If you use any other jQuery AJAX method, such as $.get, $.getJSON, etc., you have them to $.ajax.(Yes, I realize my nick is a tad ironic in this case)foois called and a function is passed to it (foo(function(result) {....});)?resultis used inside this function and is the response of the Ajax request. To refer to this function, the first parameter of foo is calledcallbackand assigned tosuccessinstead of an anonymous function. So,$.ajaxwill callcallbackwhen the request was successful. I tried to explain it a bit more.$.getJSONif you want the Ajax request to be synchronous. However, you should not event want the request to be synchronous, so that doesn't apply. You should be using callbacks or promises to handle the response, as it is explained earlier in the answer.