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Prevent or clear back history with form submission

Answer 1

+3 A:

If you're afraid of users going back checking answers then resubmitting the form, I think you're approaching the problem from the wrong end.

What you need to do is give each quiz "session" a unique ID at startup. Then do a check on form submit to see if the quiz session has already been submitted. If it has already been submitted, deny it.

jordanstephens 2010-07-09 03:26:02

Answer 2

+1 A:

There is no way to prevent a user from clicking "Back" in his/her browser. One way to accomplish the aim is to submit the form using AJAX. When he/she clicks back, it will not go to the quiz but to the previous page.

The following fully-working example uses the jQuery library:

<html><head></head><body>
  <div id="form_wrap">
    <form onsubmit="send_form(this);return false">
      ...
      <input type="submit" />
    </form>
  </div>
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"&gt;&lt;/script&gt;
  <script>
    function send_form(form) {
      jQuery.post('result.php', jQuery(form).serialize(), function(data) {
        jQuery('#form_wrap').html(data);
      });
    }
  </script>
</body></html>

Mark Eirich 2010-07-09 04:41:57

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Prevent or clear back history with form submission

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