Decimal check on OnKeyUp event

Question

I have couple of text boxes. In those text boxes I need to check few types.

1. Allow only Numbers and Decimals

   Ex: 123.2323 //not allowed any characters

2. Allow only 2 numbers after decimal

   Ex: 123.23 //not allowed any characters and only allowed 2 digits after decimal

3. Allow only 1 number after decimal

   Ex: 123.2 //not allowed any characters and only allowed 1 digits after decimal

I have to check these validation in OnKeyPress event in text boxes.

If possible need 3 methods.

Please help me on this. Thanks in advance.

Answer 1

Regular expressions and Quirksmode.org are your friends here.

Also, something like jQuery might help with validation.

Answer 2

Based on the need for this to happen on the KeyUp event, you'll need to use JavaScript. Here's a script for validating numeric only that you can modify for your needs.

Answer 3

If you want you can try this jquery plugin for formatting numbers.

You can set how many decimal places you want. It has nice documentation so it is easy to use.