Using cfparam

[natg504]

I have a parameter in a query string that should be a 4-digit year. I want to validate this to make sure it's numeric, and I was trying to use cfparam. If it's not numeric, I want to catch the error in a cfcatch tag, but it keeps skipping that tag & just displaying the error message anyway. Am I using the tag wrong?

Thanks

[Dan_Bracuk]

The function you want is isNumeric. You have already checked for the existence or url.y with isDefined.

To find out what any cold fusion tag does, google "<cfNameOfTag> x", where x is the version number. x is also optional.

To find out what any cold fusion function does, google "coldfusion NameOfFunction x". x means the same as above.

[BKBK]

Natg504,
There's nothing really wrong with your code. However, for the try-catch logic to work, you have to put the catch-block at the end. In fact, if your version is Coldfusion MX7or newer, you can even specify the range of years. Examples follow.