What is the best way to limit text input entry to numbers, lowercase letters, and certain symbols?
- by Adam Maras
Without using jQuery, what is the best way to limit text entry of a textbox to numbers, lowercase letters and a given set of symbols (for example - and _)? If the user enters an uppercase letter, I would like it to be automatically converted to a lowercase letter, and if the user enters a symbol not within the given set, I would like to be able to instantly show a validation error (show some element adjacent to or below the text box).
What's the cleanest cross-browser way of doing this without the aid of jQuery?