Created
March 19, 2010 05:50
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| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
| <html xmlns="http://www.w3.org/1999/xhtml" > | |
| <head> | |
| <title>Drag example</title> | |
| <script src="http://code.jquery.com/jquery-latest.js"></script> | |
| <script src="http://jeffrey.reactiveextensions.net/rx.js" type="text/javascript"></script> | |
| <script type="text/javascript"> | |
| jQuery.fn.ToObservable = function(eventType, eventData) { | |
| return Rx.Observable.FromJQueryEvent(this, eventType, eventData); | |
| } | |
| function drag(dragTarget) { | |
| var mouseUp = dragTarget | |
| .ToObservable("mouseup"); | |
| var mouseMove = dragTarget | |
| .ToObservable("mousemove"); | |
| var mouseDown = dragTarget | |
| .ToObservable("mousedown") | |
| .Select(function(event) { | |
| return { left : event.clientX - dragTarget.offset().left, | |
| top : event.clientY - dragTarget.offset().top }; }); | |
| return mouseDown | |
| .SelectMany(function(imageOffset) { | |
| return mouseMove | |
| .Do(function(event) { event.preventDefault(); }) | |
| .Select(function(pos) { | |
| return { target : dragTarget, | |
| left : pos.clientX - imageOffset.left, | |
| top : pos.clientY - imageOffset.top }; }) | |
| .TakeUntil(mouseUp); }); | |
| } | |
| $(document).ready(function() { | |
| var observer = Rx.Observer.Create( | |
| function(pos) { | |
| pos.target.css("left", pos.left); | |
| pos.target.css("top", pos.top); | |
| }); | |
| drag($("#dragTarget1")).Subscribe(observer); | |
| drag($("#dragTarget2")).Subscribe(observer); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <div id="dragTarget1" | |
| style="background-color: #000000; border: 1px solid #666666; | |
| color: #ffffff; padding: 10px; position: absolute; | |
| font-family: sans-serif; cursor: move"> | |
| Drag Me! | |
| </div> | |
| <div id="dragTarget2" | |
| style="background-color: #0000FF; border: 1px solid #666666; | |
| color: #ffffff; padding: 10px; position: absolute; | |
| font-family: sans-serif; cursor: move; left: 150px"> | |
| Drag Me Too! | |
| </div> | |
| </body> | |
| </html> | |
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A few things broken in this example:
Even after all that, its not really stable, you lose the drag if you get a bit violent (in chrome).