Question

I have 3 HTML inputs. When modifying the text in input 1, input 2 should update with the text that was previously in input 1. Input 3 should similarly update with the text that was previously in input 2.

Answer 1

You can do it this way.

Live Demo

<input type="text" id="txt1" class="someclass" />
<input type="text" id="txt1" class="someclass" />
<input type="text" id="txt1" class="someclass" />​

$('.someclass').change(function(){
   $(this).next('.someclass').val($(this).val()); 
   $(this).next('.someclass').change();
});​

Binding keyup event will change as soon as you type something

Live Demo