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dragndrop
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <link rel="stylesheet" href="style.css"> | |
| <title>Draggable</title> | |
| </head> | |
| <body> | |
| <div class="draggable"> | |
| Drag me, yo. | |
| </div> | |
| <script src="drag.js"></script> | |
| </body> | |
| </html> |
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| // <3'z and hugs for Paul Irish. | |
| window.requestAnimFrame = (function(){ | |
| return window.requestAnimationFrame || | |
| window.webkitRequestAnimationFrame || | |
| window.mozRequestAnimationFrame || | |
| function( callback ){ | |
| window.setTimeout(callback, 1000 / 60); | |
| }; | |
| })(); | |
| // and on with the show... | |
| var userBasePosition = {x: 0, y: 0}; | |
| var differenceFromUserBasePositionToCurrent = {x: 0, y: 0}; | |
| var boxPosition = {x: 0, y: 0}; | |
| var userIsDragging = false; | |
| var draggable = document.querySelector('.draggable'); | |
| function setUserBasePosition (evt) { | |
| userBasePosition.x = evt.clientX; | |
| userBasePosition.y = evt.clientY; | |
| // Prefer touch events if we have them. | |
| if (evt.touches && evt.touches.length) { | |
| userBasePosition.x = evt.touches[0].clientX; | |
| userBasePosition.y = evt.touches[0].clientY; | |
| } | |
| } | |
| function setPositionDifference (evt) { | |
| var currentX = evt.clientX; | |
| var currentY = evt.clientY; | |
| if (evt.touches && evt.touches.length) { | |
| currentX = evt.touches[0].clientX; | |
| currentY = evt.touches[0].clientY; | |
| } | |
| differenceFromUserBasePositionToCurrent.x = currentX - userBasePosition.x; | |
| differenceFromUserBasePositionToCurrent.y = currentY - userBasePosition.y; | |
| } | |
| function onDown (evt) { | |
| userIsDragging = true; | |
| setUserBasePosition(evt); | |
| setPositionDifference(evt); | |
| document.addEventListener('mousemove', onMove); | |
| document.addEventListener('mouseup', onUp); | |
| document.addEventListener('touchmove', onMove); | |
| document.addEventListener('touchend', onUp); | |
| evt.preventDefault(); | |
| } | |
| function onMove (evt) { | |
| if (!userIsDragging) | |
| return; | |
| setPositionDifference(evt); | |
| evt.preventDefault(); | |
| } | |
| function onUp (evt) { | |
| userIsDragging = false; | |
| setBoxPositionForEasingBackToHome(); | |
| document.removeEventListener('mousemove', onMove); | |
| document.removeEventListener('mouseup', onUp); | |
| document.removeEventListener('touchmove', onMove); | |
| document.removeEventListener('touchend', onUp); | |
| setUserBasePosition(evt); | |
| setPositionDifference(evt); | |
| } | |
| function setBoxPositionForEasingBackToHome () { | |
| boxPosition.x = boxPosition.x + differenceFromUserBasePositionToCurrent.x; | |
| boxPosition.y = boxPosition.y + differenceFromUserBasePositionToCurrent.y; | |
| } | |
| function onAnimationFrame () { | |
| var x = 0; | |
| var y = 0; | |
| if (userIsDragging) { | |
| // map to the user's cursor / finger | |
| x = boxPosition.x + differenceFromUserBasePositionToCurrent.x; | |
| y = boxPosition.y + differenceFromUserBasePositionToCurrent.y; | |
| } else { | |
| // ease the box back to its base position | |
| boxPosition.x += (0 - boxPosition.x) / 5; | |
| boxPosition.y += (0 - boxPosition.y) / 5; | |
| x = boxPosition.x; | |
| y = boxPosition.y; | |
| } | |
| draggable.style.webkitTransform = 'translate(' + x + 'px, ' + y + 'px)'; | |
| draggable.style.mozTransform = 'translate(' + x + 'px, ' + y + 'px)'; | |
| draggable.style.msTransform = 'translate(' + x + 'px, ' + y + 'px)'; | |
| draggable.style.oTransform = 'translate(' + x + 'px, ' + y + 'px)'; | |
| draggable.style.transform = 'translate(' + x + 'px, ' + y + 'px)'; | |
| requestAnimFrame(onAnimationFrame); | |
| } | |
| // mouse | |
| draggable.addEventListener('mousedown', onDown); | |
| // touch | |
| draggable.addEventListener('touchstart', onDown); | |
| requestAnimFrame(onAnimationFrame); |
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| html, body { | |
| width: 100%; | |
| height: 100%; | |
| padding: 0; | |
| margin: 0; | |
| background: #fcfcfc; | |
| font-family: Helvetica, Arial, sans-serif; | |
| } | |
| .draggable { | |
| position: absolute; | |
| left: 50%; | |
| top: 50%; | |
| width: 100px; | |
| height: 20px; | |
| margin: -30px 0 0 -80px; | |
| text-align: center; | |
| display: inline-block; | |
| padding: 40px 30px; | |
| border: 1px solid #111; | |
| background: #222; | |
| color: #FFF; | |
| position: relative; | |
| border-radius: 3px; | |
| -webkit-backface-visibility: hidden; | |
| cursor: pointer; | |
| } |
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