的$。员额（）调用的返回值 [英] Return value of $.post() call

问题描述

我有一个jQuery $。员额功能LIK这样：

I have a jquery $.post function lik so:

$.post('/test',json_data, function(data) {
                                result=data
});

这个功能实际上是被以验证使用......因此，它的返回值（数据）包含true或false。但该值不被存储在变量结果。据我所知，这是因为后发出异步调用，因此它一点儿也不等待响应。我想问的是，有一些解决方法吗？或者可以这样调用进行同步不知何故？

this function is actually being used in an validation...So it the return value(data) contains true or false. But this value is not being stored in the variable 'result'. I understand that this is because post makes an asynchronous call and hence it does'nt wait for the response. What I want to ask is, is there some workaround for this? or can this call be made synchronous somehow??

推荐答案

这被认为是不好的做法，但在的异步参数： //api.jquery.com/jQuery.ajax/相对=nofollow> $。阿贾克斯（） ，你可以设置为假并等待同步的结果是：

This is considered a bad practice but there is an async parameter in $.ajax() that you can set to false and wait synchronously for a result:

var result;
$.ajax({
  type: 'POST',
  url: '/test',
  data: json_data,
  async: false,
  success: function(data) {
    result=data;
  },
  dataType: 'application/json'
});
//result available here

有一个更地道，但在这种情况下略显不太方便，就采取回调的优点是：

A more idiomatic, although slightly less convenient in this case, would be to take advantage of callbacks:

function validate(okCallback, errorCallback) {
    $.post('/test',json_data, function(data) {
        if(data) {
            okCallback();
        } else {
          errorCallback();
        }
    });
}

validate(
    function() {
        //proceed
    },
    function() {
        //display validation error
    }
}

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