strange cache issue : FireFox4

Today i StumbleUpon a strange cache behavior of Firefox 4 which is described bellow.

1. There is a form

   <form name="widget">
   <input type="hidden" name="position" value="-1" />
   </form>

2. On an arbitrary event i have changed it to say "rss".

3. After refreshing the page using "F5", i access the value of

   alert(document.widget.position.value);

   which is returning "rss". WHY THE OLD VALUE?

4. But开发者_如何学Go after refreshing the page using "Control+F5", i access the value of

   alert(document.widget.position.value);

   which is returning correct "-1". WHY NOT FIRST TIME?

I am really confused by this behavior.

NOTE: Only FireFox4 is doing it, chrome i fine but did not tested on ie.

---

I think it's FF's caching of forms/input element values that's bugging you. You may want to use:

<form id="widget">
 <input type="hidden" id="position" value="-1" />
</form>

and to change the value:

 document.getElementById('position').value = /*[your value]*/;

Furthermore <form ... autocomplete="off"> seems to work.