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Editorial Team
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Asked: 2026-06-09T09:39:52+00:00

I am calling a very simple PHP page with some equally simple AJAX, but

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I am calling a very simple PHP page with some equally simple AJAX, but the call always returns nothing, even though the PHP is fine. That is, you can go to the URL of the PHP page and see that it echoes “Hello World” but when it is called with JS, it returns nothing.

Below is the HTML Page with the Javascript:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Title of the document</title>
</head>

<body>
The content of the document......<br />

Enter your email: <input id="email" type="text" />
<input type="button" onclick="setXMLHttpRequest()" value="Go!" />

<script type='text/javascript'/>

        var http;

        function setXMLHttpRequest()
        {
            if(window.XMLHttpRequest)
                http = new XMLHttpRequest();
            else if(window.ActiveXObject)
                http = new ActiveXObject("Microsoft.XMLHTTP");

                url = "http://www.convolutedconstruct.com /Ajax/checkemail.php?email=" + 
                                   document.getElementById('email').value;
                http.onreadystatechange = display;
                http.open("GET", url, true);
                http.send(null);

        }

        function display()
        {
            if (http.readyState == 4)
            {   
                infostr = http.responseText;
                alert("From the PHP: " + infostr);
            }
        }
</script></body></html>

Here is the content of the PHP page
Click here for the live PHP page

<?php
$email = $_GET['email'];
echo "Hello World!";
?>

Why does this return nothing to the JS, even though the PHP page echoes the text correctly?

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1 Answer

  1. Editorial Team

    As has been suggested above, AJAX request will only work usually when both the caller and called are on same domain, You have to ensure that your html code, which contains the javascript, resides on same domain http://www.convolutedconstruct.com.

    If that is not the case you can use CORS to allow your ajax to receive input from your php page by sending this header in your php output

    <?php
header("Access-Control-Allow-Origin: *");
//rest of your code
?>

    See: http://enable-cors.org/

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