Validating a text field containing a float is a valid percentage value?

Question

I have a form text field that has a KeyUp event. On KeyUp I\'m ignoring anthing but numbers, the period, backspace, delete and cursor keys. So, the only thing in the field ca

Answer 1

You could limit the length of your field to 5, check that the value can be cast to a number, and then verify that the number is between 0 and 100. You won't be able to enter 100.00, but why would you need to?

Also, here's a fiddle for testing. One note, if you really care about validating "95." as false, you'll have to add extra validation for that. However, I'd advise against this requirement, because it is still represents a valid percentage and won't affect the outcome of calculations.