How to prevent invalid characters from being typed into input fields

Question

Onkeydown, I run the following JavaScript:

function ThisOnKeyDown(el) {
   if (el.title == \'textonly\') {
       !(/^[A-Za-zÑñ-\\s]*$/i).test(e         


        

Answer 1

Run your code against the onkeyup event and not the onkeydown event. This way you can access the result of the very last keystroke where as the onkeyup event executes as a key is pressed without knowing its result.