What's wrong with this PHP/JavaScript form validation? <p>I’m not sure whether the problem I’m having is with JavaScript or with PHP. </p> <p>My objective: To validate a simple yes no form using JavaScript then process it via PHP and have a message displayed.</p> <p>My problem: When JavaScript is enabled and I click the radio button and submit it the PHP doesn’t output “YES status checked”. Instead it refreshes the page (ie. I think it simply posts the form to user_agreement4.php and does nothing else) When JavaScript is disabled and I click on the YES radio button and submit it, the message “YES status checked” displays correctly. Please note that the code below is for user_agreement4.php. The form will be submitted to itself.</p> <p>What am I doing wrong?</p> <p>Please note that this is unfinished code-I haven't added things like cookies, redirection etc. yet.</p> <p>Also I have a question about choosing answers. May I choose more than one reply as an answer?</p> <pre><code>&lt;?php // Set variables $selected_radio = 'test'; session_start(); // start up your PHP session! // The below code ensures that $dest should always have a value. if(isset($_SESSION['dest'])){ $dest = $_SESSION['dest']; } // Get the user's ultimate destination if(isset($_GET['dest'])){ $_SESSION['dest'] = $_GET['dest']; // original code was $dest = $_GET['dest']; $dest = $_SESSION['dest']; // new code } else { echo "Nothing to see here Gringo."; //Notification that $dest was not set at this time (although it may retain it's previous set value) } // Show the terms and conditions page //check for cookie if(isset($_COOKIE['lastVisit'])){ /* Add redirect &gt;&gt;&gt;&gt; header("Location: http://www.mywebsite.com/".$dest); &lt;&lt;This comment code will redirect page */ echo "aloha amigo the cookie is seto!"; } else { echo "No cookies for you"; } //Checks to see if the form was sent if (isset($_POST['submitit'])) { //Checks that a radio button has been selected if (isset($_POST['myradiobutton'])) { $selected_radio = $_POST['myradiobutton']; //If No has been selected the user is redirected to the front page. Add code later if ($selected_radio == 'NO') { echo "NO status checked"; } //If Yes has been selected a cookie is set and then the user is redirected to the downloads page. Add cookie code later else if ($selected_radio == 'YES') { echo "YES status checked"; // header("Location: http://www.mywebsite.com/".$dest); } } } ?&gt; &lt;HTML&gt; &lt;HEAD&gt; &lt;TITLE&gt;User Agreement&lt;/TITLE&gt; &lt;script language="javascript"&gt; function valbutton(thisform) { // validate myradiobuttons myOption = -1; for (i=thisform.myradiobutton.length-1; i &gt; -1; i--) { if (thisform.myradiobutton[i].checked) { myOption = i; } } if (myOption == -1) { alert("You must choose either YES or NO"); return false; } if (myOption == 0) { alert("You must agree to the agreement to download"); return false; } thisform.submit(); // this line submits the form after validation } &lt;/script&gt; &lt;/HEAD&gt; &lt;BODY&gt; &lt;H1&gt; User Agreement &lt;/H1&gt; &lt;P&gt;Before downloading you must agree to be bound by the following terms and conditions;&lt;/P&gt; &lt;form name="myform" METHOD ="POST" ACTION ="user_agreement4.php"&gt; &lt;input type="radio" value="NO" name="myradiobutton" /&gt;NO&lt;br /&gt; &lt;input type="radio" value="YES" name="myradiobutton" /&gt;YES&lt;br /&gt; &lt;input type="submit" name="submitit" onclick="valbutton(myform);return false;" value="ANSWER" /&gt; &lt;/form&gt; &lt;/BODY&gt; &lt;/HTML&gt; </code></pre>