Drag and drop: snap to a box
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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" xml:lang="en" lang="en">
<head>
<title>script.aculo.us Drag and drop functional test file</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<script src="./scriptaculous-js-1.6.4src/prototype.js" type="text/javascript"></script>
<script src="./scriptaculous-js-1.6.4src/scriptaculous.js" type="text/javascript"></script>
<script src="./scriptaculous-js-1.6.4src/unittest.js" type="text/javascript"></script>
<style type="text/css" media="screen">
div.box { background: green; width:100px; height:100px }
div.box-container { background: yellow; width:200px; height:200px }
</style>
</head>
<body>
<h1>script.aculo.us Drag and drop functional test file</h1>
<h2>Draggables/Droppables</h2>
<div id="box-normal" class="box">
Normal box
</div>
<div id="box-grid-numeric" class="box">
snap: 25
</div>
<div id="box-grid-array" class="box">
snap: [5,25]
</div>
<div id="box-grid-procedural" class="box">
snap: procedural (e.g. constrain to box)
</div>
<div class="box-container">
<div id="box-grid-procedural-gets-draggable" class="box">
snap: procedural (e.g. constrain to parent element)
</div>
</div>
<script type="text/javascript" language="javascript" charset="utf-8">
new Draggable('box-normal',{snap:false,revert:true});
new Draggable('box-grid-numeric',{snap:25,revert:true});
new Draggable('box-grid-array',{snap:[5,25],revert:true});
new Draggable('box-grid-procedural',{
snap: function(x,y) {
return[
x<100 ? (x > 0 ? x : 0 ) : 100,
y<50 ? (y > 0 ? y : 0) : 50];
},
revert:true
});
new Draggable('box-grid-procedural-gets-draggable',{
snap: function(x,y,draggable) {
function constrain(n, lower, upper) {
if (n > upper) return upper;
else if (n < lower) return lower;
else return n;
}
element_dimensions = Element.getDimensions(draggable.element);
parent_dimensions = Element.getDimensions(draggable.element.parentNode);
return[
constrain(x, 0, parent_dimensions.width - element_dimensions.width),
constrain(y, 0, parent_dimensions.height - element_dimensions.height)];
},
revert:true
});
</script>
</body>
</html>
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