Allow increase of number but not decrease

[erme]

Hi,

 

I have a input with a number as a value, say 1.55.

 

I want to allow the user to be able to increase the number but not decrease it. Is this possible?

 

Many thanks.

[fastsol]

This is a working example, there are a couple ways you could tweak this depending on your needs.

http://jsfiddle.net/fastsol/6nXxe/1/

I wanted to do the check on keyup but then you couldn't even change the last number cause it would obviously be less than the 1.55, so went with focusout instead.

[.josh]

I assume that this input field eventually comes with some kind of submit button.. alternatively you could validate it onclick or onsubmit.

 

However, just want to point out that seeing as how this is javascript, the user can simply disable javascript or overwrite your js function to do whatever the hell he wants.. you should be validating this server-side.

[erme]

This is a working example, there are a couple ways you could tweak this depending on your needs.

http://jsfiddle.net/fastsol/6nXxe/1/

I wanted to do the check on keyup but then you couldn't even change the last number cause it would obviously be less than the 1.55, so went with focusout instead.

 

Perfect, however is there an obvious reason why it wouldn't work in IE?

 

Actually it does. I'm just being stupid!

Edited July 17, 2013 by erme

[Irate]

For this feature you can use closures to capture the state of the variable, but as .josh said, please, validate it server-side.