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Page Redirection

Posted on 2002-05-15
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Last Modified: 2013-12-24
I have a processing page (act_process.cfm) that does an insert into the DB. Once somebody reached this page I want to make sure they don't click the "back" button in the browser and re-submit. Does anybody know how I can get around this? Thanks...
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Question by:the_kid
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4 Comments
 
LVL 15

Expert Comment

by:danrosenthal
ID: 7012409
Disabling the back button is not a good approach. There should be a trigger somewhere that prevents duplicate submissions.  A javascript function that is called before the form is submitted would work. When the function is called it checks a variable to see if it equals 0 and only submits the form if it does, and then sets the variable to 1, so that the form may not be re-submitted without refreshing the page.

<SCRIPT LANGUAGE="javascript">
formsubmitted=0
function chkform(){
  if(formsubmitted==0){
    formsubmitted=1;
    return true;
  }else{
    alert("Form has already been submitted!");
    return false
  }
}
</SCRIPT>

<FORM ONSUBMIT="return chkform()" ...
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LVL 14

Accepted Solution

by:
Scott Bennett earned 50 total points
ID: 7012594
another thing you could do is to set a session variable in the action page once the form has been submitted and check for it's value before processing the form.

<cfparam name="Session.ThisFormWasProcessed" default="0">

<cfif Session.ThisFormWasProcessed>
 This form was already processed. You can't do it again
<cfelse>
 ...code to process form goes here...
<cfset Session.ThisFormWasProcessed = 1>
</cfif>
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LVL 1

Expert Comment

by:Agatheeswaran
ID: 7013111
One Better Idea what I can suggest is that, before INSERTing into the table, first try to select that record with the keys, then check the recordcount.

If recordcount is greater than 1 then don't insert, else insert into the table.

Thanks

Aga.
 
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Author Comment

by:the_kid
ID: 7013503
Thanks...this seems like the easiest solution
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