$(document).on('change', 'input[id^=input_]', function() {
/* Do stuff */
});
So you could do something like this demo
// Wrap inside a document ready
// Read .on() docs (To ensure the elements...bla bla)
$(document).ready( function () {
input_index = 0;
setInterval(addInput, 1000);
$(document).on('change', 'input[id^=input_]', function() {
$(this).val($(this).attr('id'));
});
function addInput () {
$('<input type="text" id="input_'+input_index+'"/>')
.appendTo('#empty')
.change(); // <============================ Pay attention to this
input_index++;
}
});