If you'd like to prevent forms from being submitted unless a flag variable is set

Edit code and click me	Your Result (Some examples do not work in Google Chrome):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <script src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript" language="javascript"> $(document).ready(function(){ $("form").submit(function() { if ($("input:first").val() == "correct") { $("span").text("Validated...").show(); return true; } $("span").text("Not valid!").show().fadeOut(1000); return false; }); }); </script> <style> p { margin:0; color:blue; } div,p { margin-left:10px; } span { color:red; } </style> </head> <body> <p>Type 'correct' to validate.</p> <form action="javascript:alert('success!');"> <div> <input type="text" /> <input type="submit" /> </div> </form> <span></span> </body> </html>
Edit the code above and click to see the result	www.xhtml.co.il - Try it yourself