jQuery: Do I need both keyUp and change events?

Question

I have a page with 2 forms; each form has an input text field;

The value found in the input text of the 1st form must be the same with the value found in the input text of the 2nd form;

When the value changes, the other input text field also modifies its value;

Should I use both onkeyup and onchange events?

If not, which one is the right one to use?

I am asking this because it seams that I have 2 post requests, and I think that this is why.

   $('input.searchbox').keyup( function(){        $('input.txtfieldsearch').val($('input.searchbox').val());        listViewUpdate();        $('input.txtfieldsearch').trigger("keyup");    });                      $('input.txtfieldsearch').keyup( function(){        $('input.searchbox').val($('input.txtfieldsearch').val());        listViewUpdate();     });                     $('input.searchbox').change( function(){        $('input.txtfieldsearch').val($('input.searchbox').val());        listViewUpdate();        $('input.txtfieldsearch').trigger("change");    });                      $('input.txtfieldsearch').change( function(){        $('input.searchbox').val($('input.txtfieldsearch').val());        listViewUpdate();     }); 

Answer 1

You can use $.on() function and attach multiples handlers.

$("#element").on('keyup change', function (){    // Your stuff... });