YUI Library Examples: ImageCropper Control (beta): Real Time Crop Feedback

Setting up the Image Cropper

The ImageCropper Control will only work when applied to an image. So we place an image on the page and give it an id.


1	<p><img src="assets/yui.jpg" id="yui_img" height="333" width="500"></p>
2
3	<div id="results"><img src="assets/yui.jpg"></div>
4	<ul>
5	<li>Height: (<span id="h">91</span>)</li>
6	<li>Width: (<span id="w">150</span>)</li>
7	<li>Top: (<span id="t">20</span>)</li>
8	<li>Left: (<span id="l">20</span>)</li>
9	</ul>
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Next we call the ImageCropper constructor on the image.


1	(function() {
2	var Dom = YAHOO.util.Dom,
3	Event = YAHOO.util.Event;
4
5	Event.onDOMReady(function() {
6	var crop = new YAHOO.widget.ImageCropper('yui_img', {
7	initialXY: [20, 20],
8	keyTick: 5,
9	shiftKeyTick: 50
10	});
11	});
12	})();
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Next we listen for the moveEvent and react to the changes. By calling the getCropCoords method, we will be returned an object like this:

Using this information, we can use DOM to update the results with the proper information.


1	(function() {
2	var Dom = YAHOO.util.Dom,
3	Event = YAHOO.util.Event,
4	results = null;
5
6	Event.onDOMReady(function() {
7	results = Dom.get('results');
8	var crop = new YAHOO.widget.ImageCropper('yui_img', {
9	initialXY: [20, 20],
10	keyTick: 5,
11	shiftKeyTick: 50
12	});
13	crop.on('moveEvent', function() {
14	var region = crop.getCropCoords();
15	results.firstChild.style.top = '-' + region.top + 'px';
16	results.firstChild.style.left = '-' + region.left + 'px';
17	results.style.height = region.height + 'px';
18	results.style.width = region.width + 'px';
19	Dom.get('t').innerHTML = region.top;
20	Dom.get('l').innerHTML = region.left;
21	Dom.get('h').innerHTML = region.height;
22	Dom.get('w').innerHTML = region.width;
23	});
24	});
25	})();
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