Simon Simon - 5 months ago 29
JSON Question

Send JSON data to PHP using XMLHttpRequest w/o jQuery

I am trying to send JSON data from a form using the XMLHttpRequest object. I can send the data using the following function. There are no errors displayed in FireBug and the JSON-data in the request is displayed well formed by FireBug.

However, I send the data to echo.php, what simply returns the content:

<?php
print_r($_POST);
print_r($_GET);
foreach (getallheaders() as $name => $value) {
echo "$name: $value\n";
}
echo file_get_contents('php://input');
?>


The POST-array is always empty, but I can see the JSON string returned by
file_get_contents
. How does that happen? What am I doing wrong?

output of echo.php

Array
(
)
Array
(
)
Host: localhost
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:10.0.2) Gecko/20100101 Firefox/10.0.2
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: eo,de-de;q=0.8,de;q=0.6,en-us;q=0.4,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Type: application/json; charset=utf-8
Referer: http://localhost/form.html
Content-Length: 88
Cookie: {{..to much data..}}
Pragma: no-cache
Cache-Control: no-cache
{"type":"my_type","comment":"commented"}


the sending function:

function submit(){
var data={};
data.type=document.form.type.value;
data.comment=document.form.comment.value;

//get right XMLHttpRequest object for current browsrer
var x=ajaxFunction();

var string = JSON.stringify(data);

x.open('POST','echo.php',true);
x.setRequestHeader('Content-type','application/json; charset=utf-8');
x.setRequestHeader("Content-length", string.length);
x.setRequestHeader("Connection", "close");

x.onreadystatechange = function(){
if (x.readyState != 4) return;
if (x.status != 200 && x.status != 304) {
alert('HTTP error ' + req.status);
return;
}

data.resp = JSON.parse(x.responseText);
if(data.resp.status=='success'){
alert('That worked!');
}else{
alert('That didn\'t work!');
}
}
x.send(string);

return false; //prevent native form submit
}

Answer

You forgot to name your variables in the send function. The good way to use it is

x.send('name1='+string+'&name2=value2'); 

Given that, I think you will have to change the content-length header. I don't think it is usefull to send it.

One another thing you can do is try with GET method. You can also try to change your content-type header by that one :

xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded")