Change value of input onchange?

Question

I am trying to create a simple JavaScript function. When someone inserts a number in an input field, the value of another field should change to that value. Her

Answer 1

for jQuery we can use below:

by input name:

$('input[name="textboxname"]').val('some value');

by input class:

$('input[type=text].textboxclass').val('some value');

by input id:

$('#textboxid').val('some value');