How can I set an imput mask to capitalize the first letter while keeping all other lettere lower case?

I want all name entries to have the format "John Doe". The first letter in each name to be capitalized while the remaining letters remain lower case.

Form entry is: <First Name> John,  <Last Name> Doe

Example   John Doe

I do not want the form to accept either:

john doe

or

JOHN DOE

Can anyone suggest how to do this?

You may use CSS to achieve this BUT this would only take effect on the front-end perspective of the form. The text will still be sent to you in the same manner the visitor typed it in.

e.g. if someone typed in john doe, they will see it as John Doe but you will get it as john doe still

Another thing to note is that, this won't work if the user is typing in uppercase.

e.g. JOHN DOE would still appear as JOHN DOE

I'm seeing this was the form https://www.jotform.com/70076967119868 embedded on the page you included on your post.

Here are the CSS Codes you need for the first and last name fields to get that effect:

#first_4, #last_4 {

   text-transform: capitalize;

}

Here's where/how to inject the CSS Codes:

Complete guide: How-to-Inject-Custom-CSS-Codes 

RESULT:

If you wish for this to be applied on your Email Notifications instead, please have a look at the detailed guide below.

Complete guide: Capitalizing-the-First-Letter-of-Every-Field-Value-on-Email