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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>
@austegard

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@austegard austegard commented Nov 5, 2010

May want to update with correct link to the Rx lib

@gatapia

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@gatapia gatapia commented Sep 14, 2011

A few things broken in this example:

  • rx.js link broken
  • Not importing rx.jQuery.js
  • Remove block: jQuery.fn.ToObservable
  • Change ToObservable -> toObservable

Even after all that, its not really stable, you lose the drag if you get a bit violent (in chrome).

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