Ajax无法以同步方式工作

Question

I am using prototype.js for making Ajax request. Everything was working fine till I changed asynchronous to false (As I want to make synchronous requests). Following are the few lines from my code.

    var commOptions = {
                contentType: 'text/xml',
                method: 'post',
                asynchronous: true,
                evalJS: false,
                evalJSON: false
            };   
   sProxy_Url = sUrl;  
   new Ajax.Request(sProxy_Url, commOptions);   

If I change asynchronous to false then Ajax do not work. Am I missing anything ?

Answer 1

Honestly I don't see what's not working, I even got the response in javascript to make sure:

var commOptions = {
                contentType: 'text/xml',
                method: 'post',
                asynchronous: false,
                evalJS: false,
                evalJSON: false
            };   

   var a = new Ajax.Request("/", commOptions);
console.log( a.transport.responseText.length ); //16898

http://jsfiddle.net/HRu78/1/

Answer 2

It's just about always recommended to make ajax requests asynchronous since making them synchronous will block the main JavaScript thread, which provides a poor user experience (see this ).

However, if you really want to use the synchronous option you'll need to be a bit more clear about what's happening when you run the code - does the browser block? Or does the function return but with no data?