swipe me,

by Julien Etienne

HTML

from:https://stackoverflow.com/questions/15084675/how-to-implement-swipe-gestures-for-mobile-devices/58719294#58719294
<div id='swipeme' class='swipemeclass'>
    swipe me
</div>

CSS

#swipeme {
    width:100%;
    height:100%;
    background-color:orange;
    color:black;
    text-align:center;
    padding-top:20%;
    padding-bottom:20%;
}

JavaScript

function detectswipe(el,func) {
      swipe_det = new Object();
      swipe_det.sX = 0;
      swipe_det.sY = 0;
      swipe_det.eX = 0;
      swipe_det.eY = 0;
      var min_x = 20;  //min x swipe for horizontal swipe
      var max_x = 40;  //max x difference for vertical swipe
      var min_y = 40;  //min y swipe for vertical swipe
      var max_y = 50;  //max y difference for horizontal swipe
      var direc = "";
      /* ele = document.getElementById(el); */
      ele = document.querySelector(el);
      ele.addEventListener('touchstart',function(e){
        var t = e.touches[0];
        swipe_det.sX = t.screenX; 
        swipe_det.sY = t.screenY;
      },false);
      ele.addEventListener('touchmove',function(e){
        e.preventDefault();
        var t = e.touches[0];
        swipe_det.eX = t.screenX; 
        swipe_det.eY = t.screenY;    
      },false);
      ele.addEventListener('touchend',function(e){
        //horizontal detection
        if ((((swipe_det.eX - min_x > swipe_det.sX) || (swipe_det.eX + min_x < swipe_det.sX)) && ((swipe_det.eY < swipe_det.sY + max_y) && (swipe_det.sY > swipe_det.eY - max_y)))) {
          if(swipe_det.eX > swipe_det.sX) direc = "r";
          else direc = "l";
        }
        //vertical detection
        if ((((swipe_det.eY - min_y > swipe_det.sY) || (swipe_det.eY + min_y < swipe_det.sY)) && ((swipe_det.eX < swipe_det.sX + max_x) && (swipe_det.sX > swipe_det.eX - max_x)))) {
          if(swipe_det.eY > swipe_det.sY) direc = "d";
          else direc = "u";
        }
    
        if (direc != "") {
          if(typeof func == 'function') func(el,direc);
        }
        direc = "";
      },false);  
    }

    function myfunction(el,d) {
      alert("you swiped on element with id '"+el+"' to "+d+" direction");
    }



    /* detectswipe('swipeme',myfunction); */
    detectswipe('.swipemeclass',myfunction);