This example demonstrates how to retrieve and use a Node instance
+ and access DOM properties.
Press a button to get or set the offsetWidth of the div
+ containing the corn image.
Setting up the HTML
+ +<div id="ruler"></div> +<div id="corn"> + <div class="ruler-marker"></div> + <div id="output">? px</div> +</div> +<label>Width:</label> +<input id="input" size="2" value="550"> px +<button class="yui3-button btn-set">Set</button> +<button class="yui3-button btn-get">Get</button>+ + +
Getting a Node Instance
+The Y.one method accepts a Selector or HTML element and
+returns a Node instance. First we'll set up some variables
+for the node's representing our HTML.
var corn = Y.one('#corn'),
+ input = Y.one('.example #input'),
+ output = Y.one('.example #output');
+
+
+Accessing Node Properties
+The properties of a node can be accessed via its set and
+get methods.
In most cases, simple type of properties (strings, numbers, Booleans)
+pass directly to/from the underlying DOM node, however properties representing
+other DOM nodes return Node or NodeList instances.
The Get Method
+We can use the get method to read the offsetWidth of the div
+containing the corn image,
+which includes the style width, padding, and border.
width = corn.get('offsetWidth');
+
+
+The Set Method
+The Set method can be used to set the value of objects +
+input.set('value', 237);
+
+
+The offsetWidth property of an HTML element is read only, however YUI
+makes this writeable. This assures that the final offsetWidth
+matches the value that is set, regardless of borders, padding, or box model.
corn.set('offsetWidth', value);
+
+
+Listening for Node Events
+We will update the value offsetWidth property of the div
+containing the corn image when the Set button is pressed.
+
Y.one('.example .btn-set').on('click', function(e) {
+ ...
+ corn.set('offsetWidth', value);
+ ...
+};
+
+
+Complete Example Source
+<style>
+.example #corn{
+ position: relative;
+ background: url(../assets/node/images/corn.jpg);
+ width: 232px;
+ height: 181px;
+ -moz-box-shadow: 3px 3px 12px rgba(0, 0, 0, 0.4);
+ -webkit-box-shadow: 3px 3px 12px rgba(0, 0, 0, 0.4);
+ margin: 2px 0 1em;
+ border: none;
+}
+.example #ruler{
+ width: 650px;
+ height: 42px;
+ background: url("../assets/node/images/ruler_ticks.png") repeat-x scroll -1px 24px #DDCEB7;
+}
+.example .yui3-button {
+ margin: 0 0.2em;
+}
+.example .btn-get{
+ margin-left: 4em;
+}
+#input {
+ height: 1.6em;
+ width: 4em;
+}
+#output{
+ position: absolute;
+ top: -40px;
+ width: 100px;
+ height: 40px;
+ right: -50px;
+ text-align: center;
+ cursor: pointer;
+}
+#corn .ruler-marker{
+ position: absolute;
+ top: -20px;
+ right: 0;
+ height: 30px;
+ border-right: solid 1px #f00;
+}
+</style>
+
+<body>
+ <div id="ruler"></div>
+ <div id="corn">
+ <div class="ruler-marker"></div>
+ <div id="output">? px</div>
+ </div>
+ <label>Width:</label>
+ <input id="input" size="2" value="550"> px
+ <button class="yui3-button btn-set">Set</button>
+ <button class="yui3-button btn-get">Get</button>
+<script>
+YUI().use('node', 'button', function(Y) {
+ var corn = Y.one('#corn'),
+ input = Y.one('.example #input'),
+ output = Y.one('.example #output');
+
+ var getWidth = function(){
+ var width = corn.get('offsetWidth');
+ output.setHTML(width + 'px'); // display width near the get button
+ }
+
+ Y.one('.example .btn-get').on('click', getWidth);
+ output.on('click', getWidth); // also allows getting width by clicking on ruler width label
+
+ Y.one('.example .btn-set').on('click', function(e) {
+ var value = input.get('value'),
+ width = corn.get('offsetWidth');
+ if (value == '') {
+ input.set('value', width);
+ } else if (!isNaN(parseInt(value))) { // if the value in the input is a number
+ corn.set('offsetWidth', value);
+ output.setHTML('? ' + 'px'); // clear out the width label on the ruler
+ }
+ });
+});
+</script>
+
+