How do I mask the input field?

Hi,

Not sure if CSS codes are what I should be using.

I'm looking to create a set number entry ie 1234#### where the # can be any number.

It shouldn't prompt for the 1234 but if it doesn't fit that format it should reject the entry or clear what has been entered.

You may mask the input field on the form from the input textbox field properties. Please refer to the guide below that can help you with this.

https://www.jotform.com/help/381-Getting-Started-with-the-Basics-of-Input-Masking

Hope this information helps!