Ajax jquery 成功范围 [英] Ajax jquery success scope

问题描述

我有这个对 doop.php 的 ajax 调用.

I have this ajax call to a doop.php.

    function doop(){
        var old = $(this).siblings('.old').html();
        var new = $(this).siblings('.new').val();

        $.ajax({
            url: 'doop.php',
            type: 'POST',
            data: 'before=' + old + '&after=' + new,
            success: function(resp) {
                if(resp == 1) {
                    $(this).siblings('.old').html(new);
                }
            }
        });

        return false;
    }

我的问题是 $(this).siblings('.old').html(new); 行没有做它应该做的事情.

My problem is that the $(this).siblings('.old').html(new); line isn't doing what it's supposed to do.

谢谢..所有有用的评论/答案都会被投票赞成.

thanks.. all helpful comments/answers are voted up.

更新: 问题的一半似乎是范围(感谢帮助我澄清这一点的答案)，但另一半是我试图在同步中使用 ajax方式.我创建了一个新帖子

Update: it appears that half of the problem was the scope (thanks for the answers that helped me clarify that), but the other half is that I'm trying to use ajax in a synchronous manner. I've created a new post

推荐答案

首先 new 是 保留字.您需要重命名该变量.

First of all new is a reserved word. You need to rename that variable.

要回答您的问题，是的，您需要将 this 保存在成功回调之外的变量中，并在您的成功处理程序代码中引用它:

To answer your question, Yes, you need to save this in a variable outside the success callback, and reference it inside your success handler code:

var that = this;
$.ajax({
    // ...
    success: function(resp) {
        if(resp == 1) {
            $(that).siblings('.old').html($new);
        }
    }
})

这称为关闭.

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