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data not refreshed

I have a page that, on $(document).ready calls on ASP page to "draw" a previously completed survey (checkboxes and textboxes). The user can then make changes and return back to a 'summary' page by:  window.location.href

When they click in the summary to go back to the detail, the data that shows is what was originally entered, not the latest data.  It is not until I completely close the browser, re-open the summary, and click to the detail that I see the saved changes.  It is as if the first one is saved in cache???

When clicking on the link on the summary page, I tried adding a random number to the url  but that didn't seem to fix it:  http://forum.jquery.com/topic/force-page-update
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leakim971
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After reading more about cache, I realized that it was the data load that pulling from cache, the the survey page itself.

So, I incorporated your suggestion and moved the random number to the getJSON url.  I guess overkill but I had seen a post from someone where they said the cache would stop working after a few page loads and I can't have that happening:

        var randomnumber=Math.floor(Math.random()*100000);
        $.ajaxSetup({ cache: false });
        $.getJSON( 'DynamicReturn.asp?rn='+ randomnumber,    {proc:"GetPMSurveyResponses",params: varParams}, function (data) { 

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Thank you for your time.
moved the random number to the getJSON url

this is what cache:false do

Math.floor(Math.random()*100000);
if you're very unlucky you can get two times the same number
I prefer :
new Date().getTime()