Question

I have an html form which inserts data into a database. I just built it.. it’s very basic, as I’m just doing this to learn. In doing this, I see that I can hit the back browser button and post again.. and again.. and again.. and it keeps writing to the db.

I’ve seen sites where I try to resubmit info and it tells me I must wait 60 seconds (or whatever). Is this the preferred method to solve this problem? If so, how does one go about implementing it?

Or maybe you would handle it a different way?

Answer 1

There are two methods :

i) Simple client side javascript:
Store the time of last event in a javascript variable,
when the user does the event again , send an alert message about timing.
( This method can be fooled though by users knowing javascript )

ii) Store the time of last event in your database at backend when the form post is done. When the same form post is done again, check for the time, if it is allowed, do the processing, else reply with a message about the timing.