如何等待ajax调用返回 [英] how to wait for an ajax call to return

问题描述

我正在尝试使用JQuery，尽管在执行更多代码之前，我正努力成功地等待ajax调用成功。有没有办法等待ajax打电话？我看过一些例子，但它似乎只是盲目等待x秒的数量？

谢谢，
James

  var bodyContent =>  $ .ajax（{
 url：script.php，
 global：false，
 type：POST，
 data：{id：this.getAttribute（'id '）}，
 dataType：html，
 async：false，
 success：function（msg）{
 alert（msg）; 
} 
} 
）.responseText; 
  

来源： http://api.jquery.com/jQuery.ajax/

然而，同步请求是一个倒退，因为JS引擎（以及某些浏览器中的用户界面）将阻塞，直到请求完成。 Douglas Crockford曾撰写有关同步请求的文章：

同步编程是不尊重的，不应在人们使用的应用程序中使用。

I'm trying to use JQuery although i'm struggling to successfully wait for a ajax call to succeed before executing further code. Is there a way to wait for an ajax to call? I've seen examples but it seems just to wait blindly for x amount of seconds?

Thanks, James

解决方案

Yes, you can do request synchronously:

var bodyContent = $.ajax({
      url: "script.php",
      global: false,
      type: "POST",
      data: {id : this.getAttribute('id')},
      dataType: "html",
      async:false,
      success: function(msg){
         alert(msg);
      }
   }
).responseText;

Source: http://api.jquery.com/jQuery.ajax/

However, synchronous requests are a step backwards, as the JS engine (and, in some browsers, the user interface) will block until the request completes. Douglas Crockford once wrote about synchronous requests:

Synchronous programming is disrespectful and should not be employed in applications which are used by people.

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