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    <p>OffsetX and OffsetY may give you cursor pos relative to an element which is hovered now. You saved initial coordinates in mousedown. When mousemove was triggered your this coordinates changed a little, so when you subtract one from initials you got zeros (or 1px of difference) and your div went to top left corner. After it happaned your cursor hovered body element and in mousemove you get coordinates related to body. So when you subtract your zeros from the new coordinates you get real coordinates and your div go to the right place. Then you will get coordinates related to dragging div and will get zeros again, then real coords and so on. </p> <p>Use pageX and pageY instead! <a href="http://jsfiddle.net/8tHXe/7/" rel="nofollow">fiddle</a></p> <pre><code>$('.move').on("mousedown",function(me){ var move = $(this); var lastOffset = move.data('lastTransform'); var lastOffsetX = lastOffset ? lastOffset.dx : 0, lastOffsetY = lastOffset ? lastOffset.dy : 0; var startX = me.pageX - lastOffsetX, startY = me.pageY - lastOffsetY; $(document).on("mousemove",function(e){ var newDx = e.pageX - startX, newDy = e.pageY - startY; console.log("dragging", e.pageX-startX, e.pageY-startY); move.css('transform','translate(' + newDx + 'px, ' + newDy + 'px)'); // we need to save last made offset move.data('lastTransform', {dx: newDx, dy: newDy }); }); }); $(document).on("mouseup",function(){ $(this).off("mousemove"); }); </code></pre> <p>You need save original coords of your div (<code>move.offset()</code>) and use mouse offset (<code>e.pageX-startX</code>, <code>e.pageY-startY</code>) to get new coords. </p>
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    1. POWhy is dragging with css translate jumping?
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    1. POWhy is dragging with css translate jumping?
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    1. CObut the container is position absolute. I think event.page is going to work relative to the document 0,0. Isn't event.offset better than substract offset()?
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    2. CO@shuji Sorry, I made a mistake in my code, fixed. Please see my updated answer.
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    3. COOffsetX and OffsetY may give you cursor pos relative to your div, if cursor inside of it. So it did in your code and you got 0, 0. When It jumps to 0,0 cursor stays over container and on gives you real coords realtive to the container and your div jumps to correct place. And then cursor is over div again and you get 0,0 and so on.
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