jquery ajax synchronous call beforeSend

Question

I have a function called:

function callAjax(url, data) {
 $.ajax(
   {
     url: url, // same domain
     data: data,
     cache: false,
     async: false, // us         


        

Answer 1

Making a synchronous call like that is like putting up an "alert()" box. Some browsers stop what they're doing, completely, until the HTTP response is received.

Thus in your code, after your call to the "$.ajax()" function begins, nothing happens until the response is received, and the next thing as far as your code goes will be the "success" handler.

Generally, unless you're really confident in your server, it's a much better idea to use asynchronous calls. When you do it that way, the browser immediately returns to its work and simply listens in the background for the HTTP response. When the response arrives, your success handler will be invoked.