从jquery $ .post返回数据 [英] return data from jquery $.post

问题描述

我希望有一个简单的函数，我可以插入一个sqlQuery并以json格式获取数据库答案，如下所示：

I want to have a simple function where i can insert a sqlQuery and get a database answer in json-format like this:

  function ExecuteQuery(query){
    $.post("sql.php", { "query": query },
     function(data){ return data;  },
     "json");
   }

我得到的回复是未定义的，我想我误解了一些非常基本的但是我不知道什么，有人可以给我一个提示吗？

The response i get is undefined, I think i have misunderstood something quite basic but i don't know what, can anybody give me a hint?

推荐答案

问题是你想要的是你不能拥有的东西： - ）不要考虑返回值的函数，而是自己编写一个函数，将另一个函数作为参数，并在数据可用时调用它。 / p>

The problem is that you want something you cannot have :-) Instead of thinking in terms of a function that returns a value, write yourself a function that takes another function as an argument and calls it when the data is available.

function ExecuteQuery(query, callback){
  $.post("sql.php", { "query": query },
   function(data){ callback(data);  },
   "json");
 }

现在，当你调用那个函数时，你会传给它一个函数可以接受服务器响应并使用它做一些事情。

Now, when you call that function, you'll pass it a function that can take the server response and do something with it.

ExecuteQuery("whatever", function(results) {
  // do something with "results"
});

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