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.

#results { border: 1px solid black; height: 83px; width: 125px; position: relative; overflow: hidden; } #results img { position: absolute; top: -20px; left: -20px; } <p><img src="assets/yui.jpg" id="yui_img" height="333" width="500"></p> <div id="results"><img src="assets/yui.jpg"></div> <ul> <li>Height: (<span id="h">91</span>)</li> <li>Width: (<span id="w">150</span>)</li> <li>Top: (<span id="t">20</span>)</li> <li>Left: (<span id="l">20</span>)</li> </ul>

Creating the ImageCropper instance

Next we call the ImageCropper constructor on the image.

(function() { var Dom = YAHOO.util.Dom, Event = YAHOO.util.Event; Event.onDOMReady(function() { var crop = new YAHOO.widget.ImageCropper('yui_img', { initialXY: [20, 20], keyTick: 5, shiftKeyTick: 50 }); }); })();

Hooking into the ImageCroppers Events

Next we listen for the moveEvent and react to the changes. By calling the getCropCoords method, we will be returned an object like this:

{ top: 10, left: 10, height: 100. width: 300 }

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

(function() { var Dom = YAHOO.util.Dom, Event = YAHOO.util.Event, results = null; Event.onDOMReady(function() { results = Dom.get('results'); var crop = new YAHOO.widget.ImageCropper('yui_img', { initialXY: [20, 20], keyTick: 5, shiftKeyTick: 50 }); crop.on('moveEvent', function() { var region = crop.getCropCoords(); results.firstChild.style.top = '-' + region.top + 'px'; results.firstChild.style.left = '-' + region.left + 'px'; results.style.height = region.height + 'px'; results.style.width = region.width + 'px'; Dom.get('t').innerHTML = region.top; Dom.get('l').innerHTML = region.left; Dom.get('h').innerHTML = region.height; Dom.get('w').innerHTML = region.width; }); }); })();

Configuration for This Example

You can load the necessary JavaScript and CSS for this example from Yahoo's servers. Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured.