JavaScript: Simulate Keyboard Events

simulate-trigger-keyboard-key-events.js

//lsauer.com, 2012; rev. 2014 by lo sauer
//see also: http://stackoverflow.com/questions/596481/simulate-javascript-key-events/19883789#19883789
//description: trigger handlers attached to DOM elements, which listen to the type 'KeyboardEvent'
//@param s:     A single keyboard-character passed as a string e.g. "\n", "a",...
//[@param fncb]:callback function which is passed a boolean event-state (OK=true/Cancelled=false)

var doKeyEvent = function(s /*single char*/, fncb /*callback function, with handler state*/) {
    var evt = document.createEvent('KeyboardEvent');
    evt.initKeyEvent ('keypress', true, true, window,0, 0, 0, 0, 0, s.charCodeAt(0))
    var cncld = !document.getElementsByTagName('body')[0].dispatchEvent(evt);
    if(!fncb || typeof fncb != 'function'){
        fncb = function(b){if(b) { console.log('event cancelled/preventDefault-ed');} else {console.log(evt, 'received');}};
    }
    fncb.call(this, !cncld);
}

initKeyEvent has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.

See https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/initKeyEvent