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POSend JSON data to PHP using XMLHttpRequest w/o jQuery
 

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  1. POSend JSON data to PHP using XMLHttpRequest w/o jQuery
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    <p>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.</p> <p>However, I send the data to <strong>echo.php</strong>, what simply returns the content:</p> <pre><code>&lt;?php print_r($_POST); print_r($_GET); foreach (getallheaders() as $name =&gt; $value) { echo "$name: $value\n"; } echo file_get_contents('php://input'); ?&gt; </code></pre> <p>The POST-array is always empty, but I can see the JSON string returned by <code>file_get_contents</code>. How does that happen? What am I doing wrong?</p> <p><strong>output of echo.php</strong></p> <pre><code>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"} </code></pre> <p><strong>the sending function:</strong></p> <pre><code>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 &amp;&amp; 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 } </code></pre>
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