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<html>
<head>
<style>
body { margin: 0; }
#drag_div {
width: 100%;
height: 100%;
background: blue;
position: relative;
}
</style>
<script>
offsetX = 0;
offsetY = 0;
function drag(event) {
d = document.getElementById('drag_div');
offsetX = event.clientX - d.offsetLeft;
offsetY = event.clientY - d.offsetTop;
}
function drop(event) {
d = document.getElementById('drag_div');
d.style.left = event.clientX - offsetX;
d.style.top = event.clientY - offsetY;
}
function touchStart(event) {
d = document.getElementById('drag_div');
offsetX = event.touches[0].clientX - d.offsetLeft;
offsetY = event.touches[0].clientY - d.offsetTop;
}
function touchEnd(event) {
d = document.getElementById('drag_div');
d.style.left = event.changedTouches[0].clientX - offsetX;
d.style.top = event.changedTouches[0].clientY - offsetY;
}
</script>
</head>
<body id ="body">
<div id="drag_div"> </div>
</body>
<script>
document.getElementById('body').addEventListener('mouseup', drop);
document.getElementById('body').addEventListener('touchend', touchEnd);
document.getElementById('drag_div').addEventListener('mousedown', drag);
document.getElementById('drag_div').addEventListener('touchstart', touchStart);
</script>
</html>
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