Php ajax调用相同的php脚本响应null

I am developing a single page script i.e. category.php for category management.

我正在开发单页脚本，即category.php进行类别管理。

This script have an input button to invoke AJAX call.
该脚本有一个输入按钮来调用AJAX调用。

<input type="button" id="btn" />

Jquery code to bind click event and call ajax. I want json response.

用于绑定click事件并调用ajax的Jquery代码。我想要json的回应。

$(document).ready(function(e) {
$('#btn').click(function(e) {
        id=1;
        jQuery.ajax({
        type: 'post',
        url: 'category.php',
        success: function(data) {
            if(data.rstatus==1){
            alert(data.text);   
        }else
        alert(data);
    },
        data:{'id':id}


    }); 
    }); 
});

A php code to entertain AJAX call.

用于娱乐AJAX调用的PHP代码。

if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) &&
  strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
    $jsonResponse=array('rstatus'=>1,'id'=>$_POST['id']);
    header("Content-type: application/json");   
    json_encode($jsonResponse);
    die(); 
 }

Problem:

问题：

This ajax call is unable to produce correct response in call back function, and cause error in firebug console. TypeError: data is null

此ajax调用无法在回调函数中生成正确的响应，并在firebug控制台中导致错误。 TypeError：data为null

In FIREBUG Headers are as follow:

在FIREBUG标题如下：

Response Headers

响应标题

> Cache-Control no-cache, must-revalidate Connection    Keep-Alive
> Content-Length    0 Content-Type  application/json Date   Tue, 26 Mar 2013
> 12:45:52 GMT Expires  Mon, 26 Jul 1997 05:00:00 GMT
> Keep-Alive    timeout=5, max=98 Last-Modified Tue, 26 Mar 2013
> 12:45:52GMT Pragma    no-cache Server Apache/2.4.3 (Win32) OpenSSL/1.0.1c
> PHP/5.4.7 X-Powered-By    PHP/5.4.7

Request Headers

请求标题

> > Accept  */* Accept-Encoding gzip, deflate
>     > Accept-Language en-US,en;q=0.5 Content-Length   4
>     > Content-Type    application/x-www-form-urlencoded; charset=UTF-8
>     > Cookie  __gads=ID=39701a3d85dce702:T=1350383638:S=ALNI_MY_rHGVQ-qNxH4UGmbY_G-IuVcDkA;
>     > __utma=141011373.593047819.1350426838.1364292528.1364295112.314;PHPSESSID=1s73cho6ildjt80jtudt8nq0f5 Host   abc.com Referer http://www.abc.com/category.php
>     > User-Agent  Mozilla/5.0 (Windows NT 5.1; rv:19.0) Gecko/20100101
>     > Firefox/19.0 X-Requested-With   XMLHttpRequest

3 个解决方案

#1

It's look like your response content is empty. You forgot an echo.

看起来你的回复内容是空的。你忘记了回音。

if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
    $jsonResponse=array('rstatus'=>1,'id'=>$_POST['id']);
    header("Content-type: application/json"); 
    echo json_encode($jsonResponse); 
    die(); 
}

If you want to response a json, you must put it in the response content. In Php, you just have to use echo to put something in the response content.

如果要响应json，则必须将其放在响应内容中。在Php中，您只需使用echo将某些内容放入响应内容中。

#2

This doesn't work simply because $_SERVER doesn't contain that information. All request headers aren't really stored there. Have a look at getallheaders (http://php.net/manual/en/function.getallheaders.php)

这不起作用仅仅因为$ _SERVER不包含该信息。所有请求标头都没有真正存储在那里。看看getallheaders（http://php.net/manual/en/function.getallheaders.php）

Edit: Oh, also you need to echo the response. $_SERVER may contain the information you need in this case, but it is not reliable and portable. I'd still advise you to use getallheaders

编辑：哦，你也需要回应响应。 $ _SERVER可能包含您在这种情况下所需的信息，但它不可靠且便携。我仍然建议你使用getallheaders

#3

don't use HTTP_X_REQUESTED_WITH - barely works in jQuery try to send additional var, like

不要使用HTTP_X_REQUESTED_WITH - 在jQuery中几乎无法尝试发送额外的var，比如

data:{'id':id, 'request':'xmlhttprequest'}

data：{'id'：id，'request'：'xmlhttprequest'}

#1