javascript - Ajax call to PHP is returning nothing

I'm trying to make my first ajax example working on my MAMP. my ajax.html looks like:

<html>
<head>
<script src='ajax.js'></script>
</head>
<body onload = 'ajax()'>
<div id='test'></div>
</body>
</html>

my ajax.js looks like:


function ajax()
{
>>var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5

  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.open("GET","http://localhost:8888/ajax.php",true);
xmlhttp.send();
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("test").innerHTML=xmlhttp.responseText;
    }
  }
}

my ajax.php looks like:

echo 'hello world';

I detected response header from firebug:

Response Headers
Connection Keep-Alive
Content-Length 11
Content-Type text/html
Date Mon, 05 Nov 2012 18:57:46 GMT
Keep-Alive timeout=5, max=99
Server Apache/2.2.22 (Unix) mod_ssl/2.2.22 OpenSSL/0.9.8r DAV/2 PHP/5.4.4
X-Pad avoid browser bug
X-Powered-By PHP/5.4.4

but nothing in response text and nothing changed in my html.

Anyone could help me out please?

Thanks!

I'm trying to make my first ajax example working on my MAMP. my ajax.html looks like:

<html>
<head>
<script src='ajax.js'></script>
</head>
<body onload = 'ajax()'>
<div id='test'></div>
</body>
</html>

my ajax.js looks like:


function ajax()
{
>>var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5

  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.open("GET","http://localhost:8888/ajax.php",true);
xmlhttp.send();
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("test").innerHTML=xmlhttp.responseText;
    }
  }
}

my ajax.php looks like:

echo 'hello world';

I detected response header from firebug:

Response Headers
Connection Keep-Alive
Content-Length 11
Content-Type text/html
Date Mon, 05 Nov 2012 18:57:46 GMT
Keep-Alive timeout=5, max=99
Server Apache/2.2.22 (Unix) mod_ssl/2.2.22 OpenSSL/0.9.8r DAV/2 PHP/5.4.4
X-Pad avoid browser bug
X-Powered-By PHP/5.4.4

but nothing in response text and nothing changed in my html.

Anyone could help me out please?

Thanks!

Share Improve this question edited Nov 5, 2012 at 20:36 Stephen P 14.8k2 gold badges48 silver badges70 bronze badges asked Nov 5, 2012 at 19:15 Mengyu ZHang 1231 silver badge10 bronze badges

Add a ment |

1 Answer 1

Sorted by: Reset to default 12

Your problem is that you're trying to do a cross domain request. The browser prevents it due to same origin policy.

The standard solution is to set CORS headers in your PHP to allow those requests.

For example :

<?php
header("Access-Control-Allow-Origin: *");
?>

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javascript - Ajax call to PHP is returning nothing - Stack Overflow

1 Answer 1

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