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Archive for December 18th, 2008

The "Double Submit" Issue from the Server Side

food-deli-015 There are many times when you might want to ensure that a user only submits information to your system once.  The most common, of course, is when you are collecting credit card information for a purchase.  But there are other times as well.

The most common way of dealing with this is by using JavaScript to disable the submit button.  Since most people using the web have JavaScript enabled, this works 99% of the time.  But there are people who are so paranoid that they have turned off JavaScript and there are people browsing now with hand held devices that don’t support JavaScript (yet).  This means we must also protect ourselves from the double submit issue on the server side.

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