YUI Library Examples: ImageCropper Control: Connection Manager assisted image crop

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	<img src="assets/yui.jpg" id="yui_img" height="333" width="500">
2	<div id="button1"></div>
3	<div id="results"></div>
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Creating the ImageCropper instance

Next we call the ImageCropper constructor on the image.


1	(function() {
2	var Dom = YAHOO.util.Dom,
3	Event = YAHOO.util.Event;
4
5	var crop = new YAHOO.widget.ImageCropper('yui_img', {
6	initialXY: [20, 20],
7	keyTick: 5,
8	shiftKeyTick: 50
9	});
10	})();
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Create the Button

Now we need to create the button that we will use to fire the Connection Manager request.


1	var _button = new YAHOO.widget.Button({
2	id: 'cropIt',
3	container: 'button1',
4	label: 'Crop Image',
5	value: 'crop'
6	});
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Setup Connection Manager

Now that we have the button created, we need to setup the Connection Manager request.

We will listen to the Button's click event, then fire the request.


1	var callback = {
2	success: function(o) {
3	var json = o.responseText.substring(o.responseText.indexOf('{'), o.responseText.lastIndexOf('}') + 1);
4	var data = eval('(' + json + ')');
5	results.innerHTML = '<p><strong>' + data.data + '</strong></p>';
6	},
7	failure: function() {
8	results.innerHTML = '<p><strong>An error occurred, please try again later.</strong></p>';
9	}
10	};
11
12	_button.on('click', function() {
13	var coords = crop.getCropCoords();
14	var url = 'assets/crop.php?top=' + coords.top + '&left=' + coords.left + '&height=' + coords.height + '&width=' + coords.width;
15	conn = YAHOO.util.Connect.asyncRequest('GET', url, callback);
16	});
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Full Example Source


1	(function() {
2	var Dom = YAHOO.util.Dom,
3	Event = YAHOO.util.Event,
4	conn = null,
5	results = null;
6
7	Event.onDOMReady(function() {
8	results = Dom.get('results');
9	var callback = {
10	success: function(o) {
11	var json = o.responseText.substring(o.responseText.indexOf('{'), o.responseText.lastIndexOf('}') + 1);
12	var data = eval('(' + json + ')');
13	results.innerHTML = '<p><strong>' + data.data + '</strong></p>';
14	},
15	failure: function() {
16	results.innerHTML = '<p><strong>An error occurred, please try again later.</strong></p>';
17	}
18	};
19	var crop = new YAHOO.widget.ImageCropper('yui_img', {
20	initialXY: [20, 20],
21	keyTick: 5,
22	shiftKeyTick: 50
23	});
24
25	var _button = new YAHOO.widget.Button({
26	id: 'cropIt',
27	container: 'button1',
28	label: 'Crop Image',
29	value: 'crop'
30	});
31
32	_button.on('click', function() {
33	var coords = crop.getCropCoords();
34	var url = 'assets/crop.php?top=' + coords.top + '&left=' + coords.left + '&height=' + coords.height + '&width=' + coords.width;
35	conn = YAHOO.util.Connect.asyncRequest('GET', url, callback);
36	});
37	});
38	})();
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(function() {
    var Dom = YAHOO.util.Dom,
        Event = YAHOO.util.Event,
        conn = null,
        results = null;

Event.onDOMReady(function() {
 results = Dom.get('results');
 var callback = {
 success: function(o) {
 var json = o.responseText.substring(o.responseText.indexOf('{'), o.responseText.lastIndexOf('}') + 1);
 var data = eval('(' + json + ')'); 
 results.innerHTML = '' + data.data + '';
 },
 failure: function() {
 results.innerHTML = 'An error occurred, please try again later.';
 }
 };
 var crop = new YAHOO.widget.ImageCropper('yui_img', {
 initialXY: [20, 20],
 keyTick: 5,
 shiftKeyTick: 50
 });

var _button = new YAHOO.widget.Button({
            id: 'cropIt',
            container: 'button1',
            label: 'Crop Image',
            value: 'crop'
        });

_button.on('click', function() {
            var coords = crop.getCropCoords();
            var url = 'assets/crop.php?top=' + coords.top + '&left=' + coords.left + '&height=' + coords.height + '&width=' + coords.width;
            conn = YAHOO.util.Connect.asyncRequest('GET', url, callback);
        });
    });
})();

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.