Overtype Mode With Jquery

How could I make my input field act as if the keyboard is in overtype mode? I tried to trigger the keypress event with the delete button in keycode when the user enter a value but

Solution 1:

Something like:

<input onkeydown="this.oldSize = this.value.length;" 
  onkeypress="var n = this; setTimeout(function() {
      if(n.value.length > n.oldSize) {
        var s = n.selectionStart;
        n.value = n.value.substr(0, s) + n.value.substr(s + 1);
        n.selectionStart = n.selectionEnd = s;
      }
    },10);">

Solution 2:

well, i have no idea what you wanna do.maybe this will help you.

Keymaster is a simple (100 LoC or so) micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.

https://github.com/madrobby/keymaster#readme