Question

While adding text in a textarea, I dont want to allow ‘*’ after ‘&’.

I want to check on Asterisk keypress, whether previous symbol added is ‘&’, if yes, user cannot add ‘*’.

Kindly help, how to proceed.

Answer 1

You might be better off having a general function that runs after every “keyup” event which cleans up the textarea by removing any asterisks (*) immediately after an ampersand (&). This way, even if the user pastes some content which contains the invalid sequence (&*) it will still be cleaned up. So something like this:

myTextArea.onkeyup = function() {
  myTextArea.value = myTextArea.value.replace(/&\*/, '&');
  return true;
};