JAVASCRIPT

on keyup jquery

$(":input").on("keyup change", function(e) {
    // do stuff!
})

trigger keyup event jquery

$(function() {
    $('item').keydown();
    $('item').keypress();
    $('item').keyup();
    $('item').blur();
});

keyup in jquery

$(function() {
        $('textarea').keyup(checkSpeed);	//when keyup in textarea then checkSpeed function called
    });
 function checkSpeed() {}