+
+
+This example demonstrates how to insert content when working with NodeList instances.
Click buttons to build your burger.
+
+
+
+
+-
+
+ 
+
Setting up the NodeList
+First we need some HTML to work with.
+<ul class="demo"> + <li class="bun-top"><img src="assets/images/bun_top.png"/></li> + <li class="bun-bottom"><img src="assets/images/bun_bottom.png"/></li> +</ul>+ +
Next we'll add some buttons to be clicked.
+<ul class="buttons-list"> + <li><button class='yui3-button patty'> Patty · Before Last Bun</button></li> + <li><button class='yui3-button lettuce'> Lettuce · Before Last Bun</button></li> + <li><button class='yui3-button cheese' disabled="disabled"> Cheese · Before First Patty</button></li> + <li><button class='yui3-button tomato'> Tomato · After First Bun</button></li> + <li><button class='yui3-button onions'> Onions · After First Bun</button></li> + <li><button class='yui3-button pickles'> Pickles · After First Bun</button></li> + <li><button class='yui3-button ketchup'> Ketchup · After First Bun</button></li> + <li><button class='yui3-button done'> Done</button></li> + <li><button class='yui3-button another'> Another Please</button></li> +</ul>+ +
Adding Content
+After defining some vars, we'll
+add a buttonClicks handler to run when an event is fired.
+It will add content to the demo node.
Note that the this in the handler is the object that was clicked.
var demo = Y.one('.demo'),
+ btnList = Y.all('.buttons-list .yui3-button'),
+ ...;
+
+ // This inserts burger parts and manages the display of buttons
+ var buttonClicks = function (e) {
+ var obj;
+ if (this.hasClass('patty')) {
+ // Create a node with an image of the burger part
+ obj = Y.Node.create('<li class="patty"><img src="' + imgPath + 'burg_patty.png"/></li>');
+
+ // Insert it before the bottom bun
+ demo.insert(obj, Y.one('.bun-bottom'));
+
+ // ...
+ } else if // other buttons follow...
+
+The handler inserts different objects into the demo container object
+in different places based on these methods:
+
-
+
prepend- as firstChild
+ append- as lastChild
+ insert- before a specified node or childNode index
+
Attaching Events
+We assign our handler to all of the yui3-button objects through
+event subscription to the matching selector.
Y.on('click', buttonClicks, '.example .buttons-list .yui3-button');
+
+Transitions
+When an event handler simply inserts an object, it appears instantly, and +other DOM objects are rendered in their new locations, which +can be a visually jarring experience. +
+
+In this example, we've added a transitionObject function to smooth things out.
+Inserted burger elements have an initial CSS height of 0.
+After each insertion, we call the transitionObject function,
+passing the inserted object. It begins growing to a height equal to the image
+it contains (the images are different heights). This gradually pushes open a space
+for itself, while it moves in from offscreen left, and fades in.
+
var transitionObject = function (obj) {
+ obj.transition({
+ duration: 0.8,
+
+ // height grows from initial 0, to height of contained image
+ height: obj.one('img').getStyle('height'),
+ marginLeft: '0px', // transition into place from offscreen left.
+ opacity: {
+ delay: 0.2,
+ duration: 0.5,
+ value: 1
+ }
+ });
+}
+
+
+Here's more code in the buttonClicks handler where we call transitionObject,
+and do some special handling for the cheese button state.
+
// This inserts burger parts and manages the display of buttons
+var buttonClicks = function (e) {
+ var obj;
+ if (this.hasClass('patty')) {
+ // Create a node with an image of the burger part
+ obj = Y.Node.create('<li class="patty"><img src="' + imgPath + 'burg_patty.png"/></li>');
+
+ // Insert it before the bottom bun
+ demo.insert(obj, Y.one('.bun-bottom'));
+
+ // Smooth out insert with transition
+ transitionObject(obj);
+
+ // Cheese button becomes available
+ // only when there's a patty to insert before
+ Y.one('.buttons-list .cheese')._node.disabled = false;
+ } else if // other buttons follow...
+
+Complete Example Source
++In the complete source you'll see we also added handling for: +
-
+
- Removing elements from the burger +
- Clicking the Done button to vertically compress the burger +
- Requesting another +
<style>
+.example .demo, .example .buttons-list{
+ width: 302px;
+ display: inline-block;
+ zoom: 1;
+ *display: inline;
+ margin: 0;
+ padding: 0;
+ vertical-align: top;
+ text-align: center;
+}
+.example .buttons-list{
+ list-style: none;
+ text-align: left;
+ margin-left: 100px;
+ width: auto;
+ height: 21em;
+}
+.example .buttons-list .yui3-button {
+ margin-bottom: 0.5em;
+}
+.example .buttons-list .ketchup{
+ margin-bottom: 1em;
+}
+.example .buttons-list .another{
+ display: none;
+}
+.example .demo li {
+ position: relative;
+ list-style: none;
+ height: 0;
+ width: 302px;
+ opacity: 0;
+ margin: 0 0 0 -800px;
+ cursor: no-drop;
+ font-size: 1px;
+}
+.example .demo li img {
+ position: absolute;
+ top: 0;
+ left: 0;
+}
+.example .demo .bun-top, .example .demo .bun-bottom{
+ opacity: 1;
+ height: 106px;
+ margin: 0;
+}
+</style>
+ <ul class="demo">
+ <li class="bun-top"><img src="../assets/node/images/burg_bun_top.png" width="271" height="106" alt="Burger bun top"/></li>
+ <li class="bun-bottom"><img src="../assets/node/images/burg_bun_bottom.png" width="291" height="115" alt="Burger bun bottom"/></li>
+ </ul>
+ <ul class="buttons-list">
+ <li><button class='yui3-button patty'> Patty · Before Last Bun</button></li>
+ <li><button class='yui3-button lettuce'> Lettuce · Before Last Bun</button></li>
+ <li><button class='yui3-button cheese' disabled="disabled"> Cheese · Before First Patty</button></li>
+ <li><button class='yui3-button tomato'> Tomato · After First Bun</button></li>
+ <li><button class='yui3-button onions'> Onions · After First Bun</button></li>
+ <li><button class='yui3-button pickles'> Pickles · After First Bun</button></li>
+ <li><button class='yui3-button ketchup'> Ketchup · After First Bun</button></li>
+ <li><button class='yui3-button done'> Done</button></li>
+ <li><button class='yui3-button another'> Another Please</button></li>
+ </ul>
+<script>
+YUI().use('node', 'cssbutton', 'transition', 'UA', function (Y) {
+ var demo = Y.one('.demo'),
+ btnList = Y.all('.buttons-list .yui3-button'),
+ i = 0,
+ objList,
+ myZIndex,
+ imgPath = '../assets/node/images/';
+
+ if (Y.UA.ie && Y.UA.ie < 7) {
+
+ // Add a prefix to the image file name in the imgPath.
+ // This is needed to work around IE6 non-support of alpha pngs
+ imgPath = imgPath + '8bit_';
+ Y.one('.example .demo .bun-top img').setAttribute('src', imgPath + 'burg_bun_top.png');
+ Y.one('.example .demo .bun-bottom img').setAttribute('src', imgPath + 'burg_bun_bottom.png');
+ }
+
+ // This smoothes out the visual experience of adding
+ // an element to the burger
+ var transitionObject = function (obj) {
+ obj.transition({
+ duration: 0.8,
+
+ // height grows from initial 0, to height of contained image
+ height: obj.one('img').getStyle('height'),
+ marginLeft: '0px', // transition into place from offscreen left.
+ opacity: {
+ delay: 0.2,
+ duration: 0.5,
+ value: 1
+ }
+ });
+ }
+
+ // This removes an element of the burger
+ // the height transitions to 0, it moves left, and fades out
+ var removeObject = function(e) {
+ e.currentTarget.transition({
+ duration: 0.8,
+ height: 0,
+ marginLeft: '-400px',
+ opacity: {
+ delay: 0.2,
+ duration: 0.5,
+ value: 0
+ }
+ },
+ // after the transition finishes...
+ function(){
+ e.currentTarget.remove(); // remove the clicked item from the DOM
+
+ // If there's no patty in the burger
+ if (Y.one('.example .demo').getHTML().indexOf('patty') === -1) {
+ // Disable the cheese button
+ // Cheese is inserted before first patty.
+ // The cheese button will be enabled when there's a patty
+ Y.one('.buttons-list .cheese')._node.disabled = true;
+ }
+ });
+ }
+
+ // This inserts burger parts and manages the display of buttons
+ var buttonClicks = function (e) {
+ var obj;
+ if (this.hasClass('patty')) {
+ // Create a node with an image of the burger part
+ obj = Y.Node.create('<li class="patty"><img src="' + imgPath + 'burg_patty.png" width="268" height="75" alt="Burger patty"/></li>');
+
+ // Insert it before the bottom bun
+ demo.insert(obj, Y.one('.bun-bottom'));
+
+ // Smooth out insert with transition
+ transitionObject(obj);
+
+ // Cheese button becomes available
+ // only when there's a patty to insert before
+ Y.one('.buttons-list .cheese')._node.disabled = false;
+ } else if (this.hasClass('lettuce')) {
+ obj = Y.Node.create('<li class="lettuce"><img src="' + imgPath + 'burg_lettuce.png" width="302" height="87" alt="Lettuce"/></li>');
+ demo.insert(obj, Y.one('.bun-bottom'));
+ transitionObject(obj);
+ } else if (this.hasClass('cheese')) {
+ obj = Y.Node.create('<li class="cheese"><img src="' + imgPath + 'burg_cheese.png" width="274" height="89" alt="Cheese"/></li>');
+ demo.insert(obj, Y.one('.patty'));
+ transitionObject(obj);
+ } else if (this.hasClass('ketchup')) {
+ obj = Y.Node.create('<li class="ketchup"><img src="' + imgPath + 'burg_ketchup.png" width="208" height="66" alt="Ketchup"/></li>');
+ Y.one('.bun-top').insert(obj, 'after');
+ transitionObject(obj);
+ } else if (this.hasClass('pickles')) {
+ obj = Y.Node.create('<li class="pickles"><img src="' + imgPath + 'burg_pickles.png" width="236" height="61" alt="Pickles"/></li>');
+ Y.one('.bun-top').insert(obj, 'after');
+ transitionObject(obj);
+ } else if (this.hasClass('onions')) {
+ obj = Y.Node.create('<li class="onions"><img src="' + imgPath + 'burg_onions.png" width="248" height="77" alt="Onions"/></li>');
+ Y.one('.bun-top').insert(obj, 'after');
+ transitionObject(obj);
+ } else if (this.hasClass('tomato')) {
+ obj = Y.Node.create('<li class="tomato"><img src="' + imgPath + 'burg_tomato.png" width="225" height="68" alt="Tomato slice"/></li>');
+ Y.one('.bun-top').insert(obj, 'after');
+ transitionObject(obj);
+ } else if (this.hasClass('done')) {
+ objList = Y.all('.demo li');
+ myZIndex = objList.size(); // for resetting z-index of burger parts
+
+ // Hide all the buttons when done
+ btnList.setStyle('display', 'none');
+
+ // Show the "Another Please" button
+ Y.one('.buttons-list .another').setStyle('display', 'block');
+
+ // The normal z-index of <li>s in a <ul> results in the
+ // bottom of the bun picture being on top
+ // The z-index of the burger elements must be reversed.
+ for (i = 0; i < objList.size(); i += 1) {
+ objList.item(i).setStyle('zIndex', myZIndex);
+ myZIndex -= 1;
+ objList.item(i).setStyle('position', 'relative');
+ // transition the height of the elements proportionally smaller
+ // so you could get your mouth around it
+ objList.item(i).transition({
+ duration: 0.5,
+ height: parseInt(objList.item(i).one('img').getStyle('height'), 10) * 0.15 + 'px'
+ });
+ }
+ } else if (this.hasClass('another')) {
+ // Empty out the content of the burger image
+ demo.setContent('');
+
+ // Insert just the buns
+ demo.append('<li class="bun-top"><img src="' + imgPath + 'burg_bun_top.png" width="271" height="106" alt="Burger bun top"/></li>');
+ demo.append('<li class="bun-bottom"><img src="' + imgPath + 'burg_bun_bottom.png" width="291" height="115" alt="Burger bun bottom"/></li>');
+
+ // Disable the cheese button
+ // Cheese is inserted before first patty.
+ // The cheese button will be enabled when there's a patty
+ Y.one('.buttons-list .cheese')._node.disabled = true;
+
+ // Display all the buttons except the "Another Please"
+ btnList.setStyle('display', 'block');
+ Y.one('.buttons-list .another').setStyle('display', 'none');
+ }
+ }
+ Y.on('click', buttonClicks, '.example .buttons-list .yui3-button');
+ Y.one('.example .demo').delegate('click', removeObject, 'li');
+});
+</script>
+
+