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

$('.key-filter').keypress(function () {
    if (event.key.replace(/[^\w\-.]/g,'')=='') event.preventDefault();
});

then add the key-filter class to your input if using jquery or

just put the charaters you want to allow inside the [] after the ^. this allows all letters numbers _ - and .