How to detect a long touch pressure with javascript for android and iphone?

The problem with using Touch End to detect the long touch is it won't work if you want the event to fire after a certain period of time. It is better to use a timer on touch start and clear the event timer on touch end. The following pattern can be used:

var onlongtouch; var timer;var touchduration = 500; //length of time we want the user to touch before we do somethingtouchstart() {    timer = setTimeout(onlongtouch, touchduration); }touchend() {    //stops short touches from firing the event    if (timer)        clearTimeout(timer); // clearTimeout, not cleartimeout..}onlongtouch = function() { //do something };

Here is an extended version of Joshua answer, as his code works well till user doesn't perform multitouch (you can tap screen with two fingers and function will be triggered two times, 4 fingers - 4 times). After some additional test scenarios I even triggered possibility to touch very freequently and receive function executing after each tap.

I added variable named 'lockTimer' which should lock any additional touchstarts before user trigger 'touchend'.

var onlongtouch; var timer;var touchduration = 800; //length of time we want the user to touch before we do somethingfunction touchstart(e) {    e.preventDefault();    if (!timer) {        timer = setTimeout(onlongtouch, touchduration);    }}function touchend() {    //stops short touches from firing the event    if (timer) {        clearTimeout(timer);        timer = null;    }}onlongtouch = function() {     timer = null;    document.getElementById('ping').innerText+='ping\n'; };document.addEventListener("DOMContentLoaded", function(event) {     window.addEventListener("touchstart", touchstart, false);    window.addEventListener("touchend", touchend, false);});

<div id="ping"></div>