![]() ![]() ![]() Or we can use both event handlers together. There we can check the new input.value and modify it/highlight the when it’s invalid. The alternative approach would be to track the oninput event – it triggers after any modification. Mobile devices provide other means to enter values. And there’s no way to stop it by preventing the default action in JavaScript.įor instance, the below expects a phone number, so it does not accept keys except digits, +, () or -:Įven though we have the key filter, one still can enter anything using a mouse and right-click + Paste. For instance, on Windows Alt +F4 closes the current browser window. Preventing the default action on keydown can cancel most of them, with the exception of OS-based special keys.
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