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drag n drop javascript to iphone support

/ Published in: iPhone
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turns screen touches into mouse clicks - useful for porting drag n drop to iphone / ipad

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  1. <script type="text/javascript"> 
  2.  
  3. function touchHandler(event)
  4. {
  5.     var touches = event.changedTouches,
  6.         first = touches[0],
  7.         type = "";
  8.  
  9.  
  10.     switch(event.type)
  11.     {
  12.         case "touchstart":
  13.             type = "mousedown";
  14.             break;
  15.  
  16.         case "touchmove":
  17.             type="mousemove";        
  18.             event.preventDefault();
  19.             break;        
  20.  
  21.         case "touchend":
  22.             type="mouseup";
  23.             break;
  24.  
  25.         default:
  26.             return;
  27.     }
  28.  
  29.     var simulatedEvent = document.createEvent("MouseEvent");
  30.  
  31.     //initMouseEvent(type, canBubble, cancelable, view, clickCount, screenX, screenY, clientX, clientY, 
  32.     //               ctrlKey, altKey, shiftKey, metaKey, button, relatedTarget);
  33.  
  34.     simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
  35.                                   false, false, false, false, 0/*left*/, null);
  36.  
  37.     first.target.dispatchEvent(simulatedEvent);
  38.  
  39.     //event.preventDefault();
  40. }
  41.  
  42. function init() 
  43. {
  44.     document.addEventListener("touchstart", touchHandler, false);
  45.     document.addEventListener("touchmove", touchHandler, false);
  46.     document.addEventListener("touchend", touchHandler, false);
  47.     document.addEventListener("touchcancel", touchHandler, false);    
  48. }
  49.  
  50. //and what i've done here is create a load_function yield statement that attaches init() to the body onload= tag if you are using rails - otherwise just do <body onload="init();"> 
  51.  
  52.  <% load_function "init();"%>
  53.  
  54.         </script>

URL: http://www.gorankem.com/bestof2010

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