cold fusion duplicating

How do you stop CF from duplicating a new data entry when you refresh?

There are several ways of doing this, but in simple self-submitting pages, I tend to CFLOCATION to the resulting display/page. Then when you reload, you'll just reload without resending form data.

To entirely prevent resubmission of form data for a user who goes back through their history, you will have to implement something more complication such as saving a session-based serial-list that represents all forms/serial numbers that have been submitted ths far and prevent resubmission of those forms.

This entirely depends on what your application is doing. If they are registering or creating a profile, then when the form is submitted the first time and it is successful, set a session variable to say that they have completed this process. Then as long as that session variable is there, they cannot register again with the same info.

Also, I am assuming that before you insert anything, you are checking the current data in the database with the data being submitted so that there is not duplicate data being entered.

Clint