Question

How can I restrict users from entering special characters and numbers in the text box. I want only alphabets to be entered ( Typed / Pasted ).

give me sample javascript codes?

Answer 1

Rather than preventing the entry of certain characers, it is far more user friendly and effective to validate the value when the form is submitted. You really don’t care what the value of the field is before that, and you don’t need special handling for how the value is entered. It might be pasted, dragged, auto-entered, entered by a plugin or script, or other methods.

A trivial example:

</script>

<form onsubmit="return validate(this);">
  <input type="text" name="foo">
  <input type="submit">
</form>

<script type="text/javascript">
function validate(form) {
  var re = /^[a-z,A-Z]+$/i;

  if (!re.test(form.foo.value)) {
    alert('Please enter only letters from a to z');
    return false;
  }
}
</script>