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POAuthentication using AJAX & PHP
 

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  1. POAuthentication using AJAX & PHP
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    <p>I make a simple program to simulate authentication using AJAX and PHP. The following is my code. It will redirect to "/?" but nothing happened. I tried to use <code>checkLogin(); return false;</code> in <code>onclick</code> event but it didn't work.</p> <p><strong>index.php</strong></p> <pre><code>&lt;script type="text/javascript" src="validation.js"&gt;&lt;/script&gt; &lt;form&gt; &lt;p&gt; &lt;label&gt;Username &lt;abbr title="Required"&gt;*&lt;/abbr&gt;&lt;/label&gt; &lt;input id="usernamelogin" type="text" value="" /&gt; &lt;/p&gt; &lt;p&gt; &lt;label&gt;Password &lt;abbr title="Required"&gt;*&lt;/abbr&gt;&lt;/label&gt; &lt;input id="passwordlogin" type="text" value="" /&gt; &lt;/p&gt; &lt;p&gt; &lt;input id="login" type="submit" value="Login" onclick="checkLogin()" /&gt; &lt;/p&gt; &lt;/form&gt; </code></pre> <p><strong>validation.js</strong></p> <pre><code>function checkLogin(){ var u = document.getElementById("usernamelogin").value; var p = document.getElementById("passwordlogin").value; if(window.XMLHttpRequest){ xmlhttp = new XMLHttpRequest(); } else{ xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onReadystatechange = function(){ if(xmlhttp.readyState == 4 &amp;&amp; xmlhttp.status == 200){ if(xmlhttp.responseText == u){ alert(':)'); } else{ alert(':('); } } } xmlhttp.open("GET", "login.php?u=" + u + "&amp;p=" + p, true); xmlhttp.send(); } </code></pre> <p><strong>login.php</strong></p> <pre><code>&lt;?php $u = $_GET['u']; $p = $_GET['p']; $host = 'localhost'; $user = 'root'; $pass = ''; $db = 'db'; $con = mysql_connect($host, $user, $pass); if(!$con) die("Could not connect: " . mysql_error()); mysql_select_db($db, $con); $query = "select username from login where username = '" . $u . "' and password = '" . $p . "'"; $result = mysql_query($query); $row = mysql_fetch_array($result); echo $row['username']; mysql_close($con); ?&gt; </code></pre>
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    1. USshankshera
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    1. COWhy not using `/login.php` to be sure it will perform request to the same URL independent from the current URL. Also could you check if any XHR requests are performed using the Developer tools of Chrome or Firebug for Firefox?
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      1. POAuthentication using AJAX & PHP
      1. USHaralan Dobrev
    2. COif you like , i have suggestions 1) mysql_* are depricated 2)this authentication method is very weak!
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      1. POAuthentication using AJAX & PHP
      1. US7-isnotbad
    3. CONot an answer to your question, but you didn't sanitize your db inputs which is very dangerous. Certainly not safe for production.
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      1. POAuthentication using AJAX & PHP
      1. USChristopher
 

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