How to make it so only numbers can be entered into a text box

How to make it so only numbers can be entered into a text box

Hi @Keep_Active_Health_W

Try this:

{formtext: name=value}
{if: len(value) > 0 and not isnumber(value)}{error: You must only input a number}{endif}

It uses our isnumber function: Text Blaze | Formula Reference