June 2008
Intermediate to advanced
488 pages
15h 3m
English
Content preview from Dojo: The Definitive Guide
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Animation + Drag-and-Drop = Fun!
Drag-and-drop combined with animations are an incredibly powerful combination. Take a moment to review and experiment with the following block of code, which combines very basic concepts from drag-and-drop in the previous chapter with what you've been learning about in this one; it's illustrated in Figure 8-6.
Figure 8-6. A visualization of the x^5 easing function
<html>
<head>
<title>Animation + Drag and Drop = Fun!</title>
<script
type="text/javascript"
src="http://o.aolcdn.com/dojo/1.1/dojo/dojo.xd.js">
</script>
<script type="text/javascript">
dojo.require("dojo.fx");
dojo.require("dojo.dnd.move");
dojo.addOnLoad(function( ){
var move = new dojo.dnd.Moveable(dojo.byId("ball"));
var coords;
dojo.subscribe("/dnd/move/start",function(e){
// when drag starts, save the coords
coords = dojo.coords(e.node);
});
//now use the coords to control where the image slides back
dojo.subscribe("/dnd/move/stop",function(e){
dojo.fx.slideTo({
node: e.node,
top: coords.t,
left: coords.l,
duration:1200,
easing : function(x) { return Math.pow(x,5);}
}).play( );
});
});
</script>
</head>
<body>
<!-- Insert any image into the page here in place of ball.png -->
<img style="position : absolute; left : 300px; top : 300px;"
id="ball"
src="ball.png"/>
</body>
</html>To summarize, the code example detects the start of a global drag event and remembers the coordinates of where ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.