Able to receive data using $_GET but not $_POST [duplicate]

Question

Using Ajax to communicate with server,

I am trying to pass a value to dat.php using AJAX and get another value from dat.php back. The below code works fine when I use GET but doesn't work work with POST. I need to use POST as this is sensitive information I am trying to pass. Any idea hwy this is happening.

This is my code on test.php

<html> <body> <form action="<?php echo $_SERVER['$PHP_SELF'];?>" method="post"> <input type="text" name="value" onchange="ch_email1(this.value)"></input> </form> <script> function ch_email1(str){ var ajaxRequest; try{ ajaxRequest = new XMLHttpRequest(); } catch (e){ try{ ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try{ ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e){ // Something went wrong var xl=xmlhttp.responseText alert("Something Went wrong"); return false; } } } ajaxRequest.onreadystatechange = function(){ if(ajaxRequest.readyState == 4){ var xl=ajaxRequest.responseText; alert (xl); } } ajaxRequest.open("POST","dat.php?q="+str, true); ajaxRequest.send(null); } </script> </body> </html>

This is dat.php

<?php $q=$_POST['q']; echo $q; ?>

Please note that above code works fine when I replace POST with GET. Any ides why this is happening.

If jQuery is an option, I'd recommend using it. It makes making ajax calls much simpler. — random_user_name
– random_user_name, Commented Apr 17, 2013 at 0:47
when you are using post , you can not send the data as querystring. — Satya
– Satya, Commented Apr 17, 2013 at 0:48
Well, you're not sending any POST data in the request body... — deceze
– deceze ♦, Commented Apr 17, 2013 at 0:52
Note that POST doesn't protect sensitive data. You may also want to use HTTPS (SSL). — Luke Mills
– Luke Mills, Commented Apr 17, 2013 at 0:54

jeremysawesome · Accepted Answer · 2013-04-17 00:52:01Z

This might help:

 ajaxRequest.open("POST","dat.php", true); ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); ajaxRequest.send("q="+str);

Trenton Trama · Accepted Answer · 2013-04-17 00:51:52Z

Take a look at this page.
http://www.openjs.com/articles/ajax_xmlhttp_using_post.php

Right now, you're sending a post request with nothing in it. Appending to the url just changes the $_GET variables.

MatRt · Accepted Answer · 2013-04-17 00:52:08Z

You are mixing POST Ajax call with GET way

When you send an AJAX call with POST, you don't have to put parameter on the URL, but you must send parameters using the .send() method.

exemple:

ajaxRequest.open("POST","dat.php",true); ajaxRequest.send("q=" + str);

You should use a JS librairy like jQuery or other, that will make it for you, instead of re-inventing the wheel and have common problems.

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