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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>YUI Library Examples: Carousel Control: Using Ajax for deferred loading of items</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
<style>
/*Supplemental CSS for the YUI distribution*/
#custom-doc { width: 95%; min-width: 950px; }
#pagetitle {background-image: url(../../assets/bg_hd.gif);}
</style>
<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
<!--Script and CSS includes for YUI dependencies on this page-->
<link rel="stylesheet" type="text/css" href="../../build/logger/assets/skins/sam/logger.css" />
<link rel="stylesheet" type="text/css" href="../../build/carousel/assets/skins/sam/carousel.css" />
<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
<script type="text/javascript" src="../../build/event/event-min.js"></script>
<script type="text/javascript" src="../../build/dom/dom-min.js"></script>
<script type="text/javascript" src="../../build/logger/logger-min.js"></script>
<script type="text/javascript" src="../../build/connection/connection-min.js"></script>
<script type="text/javascript" src="../../build/element/element-min.js"></script>
<script type="text/javascript" src="../../build/carousel/carousel-debug.js"></script>
<script type="text/javascript" src="../../build/button/button-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
/* Style the spotlight container */
#spotlight {
border: 1px solid #ccc;
height: 240px;
margin: 10px auto;
padding: 1px;
text-align: center;
width: 240px;
}
#carousel {
margin: 0;
}
#container {
margin: 0 auto;
}
.yui-skin-sam .yui-carousel-nav ul,
.yui-skin-sam .yui-carousel-nav select {
display: none;
}
/* Always be sure to give your carousel items a width and a height */
.yui-carousel-element li {
height: 75px;
width: 75px;
}
</style>
<!--end custom header content for this example-->
<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
YAHOO.util.Event.throwErrors = true;
}
</script>
</head>
<body id="yahoo-com" class="yui-skin-sam">
<div id="custom-doc" class="yui-t2">
<div id="hd">
<div id="ygunav">
<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
<form action="http://search.yahoo.com/search" id="sitesearchform">
<input name="vs" type="hidden" value="developer.yahoo.com">
<input name="vs" type="hidden" value="yuiblog.com">
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<label for="searchinput">Site Search (YDN &amp; YUIBlog): </label>
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<input type="submit" value="Search" id="searchsubmit" class="ygbt">
</div>
</form> </div>
<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
<div id="pagetitle"><h1>YUI Library Examples: Carousel Control: Using Ajax for deferred loading of items</h1></div>
</div>
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-ge">
<div class="yui-u first example">
<div class="promo">
<h1>Carousel Control: Using Ajax for deferred loading of items</h1>
<div class="exampleIntro">
<p>
This example showcases the dynamic loading capabilities of the <a href="http://developer.yahoo.com/yui/carousel/">YUI Carousel Control</a>. The YUI Carousel Control exposes an event called <code>loadItems</code>. This
event is fired whenever the Carousel needs items to be loaded into it for
display. Subscribing to this event makes it easy to dynamically load
the next set of images.
</p>
</div>
<div class="example-container module ">
<div class="hd exampleHd">
<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="csl_dynload2_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
</div> <div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<!-- The Carousel container -->
<div id="container">
<ol id="carousel"></ol>
</div>
<!-- The spotlight container -->
<div id="spotlight"></div>
<script>
var curpos, items = [];
function getImageTag(img) {
return "<img src=\"" + img + "\" height=\"75\" width=\"75\">";
}
function getImages() {
var carousel = this;
YAHOO.util.Connect.asyncRequest("GET", "assets/php/getimages.php?pos="+curpos,
{
success: function (o) {
var i = curpos,
j = 0,
r = eval('(' + o.responseText + ')');
curpos += r.length;
while (i < curpos) {
if (r[j]) {
carousel.addItem(getImageTag(r[j]));
} else {
break;
}
i++;
j++;
}
carousel.set("selectedItem", carousel.get("firstVisible"));
},
failure: function (o) {
alert("Ajax request failed!");
}
});
}
// Get the image link from within its (parent) container.
function getLargeImage(parent) {
var el = parent.firstChild;
while (el) { // walk through till as long as there's an element
if (el.nodeName.toUpperCase() == "IMG") { // found an image
// flickr uses "_s" suffix for small, and "_m" for big
// images respectively
return el.src.replace(/_s\.jpg$/, "_m.jpg");
}
el = el.nextSibling;
}
return "";
}
YAHOO.util.Event.onDOMReady(function (ev) {
var carousel, spotlight = YAHOO.util.Dom.get("spotlight");
carousel = new YAHOO.widget.Carousel("container", {
/* Setting numItems is required for dynamic loading. This property lets Carousel
know how many total items it will ever be populated with (statically and/or dynamically).
Not to be confused with numVisible: the number of items shown to a
user per page. In this example, we don't specify numVisible and Carousel
defaults to 3 items visible per page. */
numItems: 17
});
YAHOO.util.Connect.asyncRequest("GET", "assets/php/getimages.php", {
success: function (o) {
var i, r = eval('(' + o.responseText + ')');
curpos = r.length;
for (i = 0; i < curpos; i++) {
items.push(r[i]);
}
// check if the Carousel widget is available
if (typeof carousel != "undefined") {
for (i = 0; i < curpos; i++) {
// if so, shove the elements into it
carousel.addItem(getImageTag(items[i]));
}
carousel.set("selectedItem", 0);
items = [];
}
},
failure: function (o) {
alert("Ajax request failed!");
}
});
carousel.on("loadItems", function (o) {
// more items available?
getImages.call(this);
});
carousel.on("itemSelected", function (index) {
// item has the reference to the Carousel's item
var item = carousel.getElementForItem(index);
if (item) {
spotlight.innerHTML = "<img src=\""+getLargeImage(item)+"\">";
}
});
carousel.render();
carousel.show();
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h2 class="first">Making the Carousel Widget dynamically load images on the fly</h2>
<p>
Here we will use the <a href="http://developer.yahoo.com/yui/carousel/">YUI Carousel Control</a>'s <code>loadItems</code> event to dynamically
load the images on the fly.</p>
<p>
This example has the following dependencies:
</p>
<textarea name="code" class="HTML" cols="60" rows="1"><link type="text/css" rel="stylesheet" href="http://yui.yahooapis.com/2.8.2r1/build/carousel/assets/skins/sam/carousel.css">
<script src="http://yui.yahooapis.com/2.8.2r1/build/yahoo/yahoo-dom-event.js"></script>
<script src="http://yui.yahooapis.com/2.8.2r1/build/element/element-min.js"></script>
<script src="http://yui.yahooapis.com/2.8.2r1/build/connection/connection-min.js"></script>
<script src="http://yui.yahooapis.com/2.8.2r1/build/carousel/carousel-min.js"></script></textarea>
<p>
Initially we use <a href="http://developer.yahoo.com/yui/connection/">YUI Connection Manager</a> to load the initial set of items as
soon as part of the DOM is visible.</p>
<textarea name="code" class="HTML" cols="60" rows="1"><div id="container">
<ol id="carousel"></ol>
</div>
<!-- The spotlight container -->
<div id="spotlight"></div></textarea>
<p>
We have a few simple CSS rules to set the dimensions for the Carousel items.
</p>
<textarea name="code" class="CSS" cols="60" rows="1">
/* Always be sure to give your carousel items a width and a height */
.yui-carousel-element li {
height: 75px;
width: 75px;
}</textarea>
<p>
The YUI Carousel Control's constructor is passed <code>numItems</code> (the total number of items) so that it triggers the <code>loadItems</code> event if the items are not available.
We'll use Connection Manager to load a set of items into the
Carousel as early as possible.
</p>
<textarea name="code" class="JScript" cols="60" rows="1">YAHOO.util.Event.onDOMReady(function (ev) {
var carousel, spotlight = YAHOO.util.Dom.get("spotlight");
carousel = new YAHOO.widget.Carousel("container", {
/* Setting numItems is required for dynamic loading. This property lets Carousel
know how many total items it will ever be populated with (statically and/or dynamically).
Not to be confused with numVisible: the number of items to display
per page. In this example, we don't specify numVisible and Carousel
defaults to 3 items visible per page. */
numItems: 17
});
YAHOO.util.Connect.asyncRequest("GET", "php/getimages.php", {
success: function (o) {
var i, r = eval('(' + o.responseText + ')');
curpos = r.length;
for (i = 0; i < curpos; i++) {
items.push(r[i]);
}
// check if the Carousel widget is available
if (typeof carousel != "undefined") {
for (i = 0; i < curpos; i++) {
// if so, shove the elements into it
carousel.addItem(getImageTag(items[i]));
}
carousel.set("selectedItem", 0);
items = [];
}
},
failure: function (o) {
alert("Ajax request failed!");
}
});
});</textarea>
<p>
The YUI Carousel Control exposes a <code>loadItems</code> custom event that is fired
when the Carousel needs more items to be loaded. This becomes very handy
for us since we can subscribe to it and add more items in to the Carousel
widget when required.
</p>
<p>
In our case, the server program returns an array (JSON) of images. This is
parsed in the Ajax callback and then the Carousel's <code>addItem()</code> is called for
every image.
Apart from subscribing to this event, for displaying the selected image as a spotlight, we can subscribe to the <code>itemSelected</code> event that Carousel control exposes.
This event is triggered whenever an item is selected and it returns the
index of the selected item. With the index of the item, we can use the
Carousel's <code>getElementForItem()</code> API to get the reference to the Carousel's item (an <code>li</code> element in
our case).
</p>
</p>
<textarea name="code" class="JScript" cols="60" rows="1">
carousel.on("loadItems", function (o) {
// more items available?
getImages.call(this);
});
carousel.on("itemSelected", function (index) {
var item = carousel.getElementForItem(index);
if (item) {
spotlight.innerHTML = "<img src=\"" + getImage(item) + "\">";
}
});
carousel.render();
carousel.show();
function getImageTag(img) {
return "<img src=\"" + img + "\" height=\"75\" width=\"75\">";
}
function getImages() {
var carousel = this;
YAHOO.util.Connect.asyncRequest("GET",
"assets/php/getimages.php?pos="+curpos, {
success: function (o) {
var i = curpos,
j = 0,
r = eval('(' + o.responseText + ')');
curpos += r.length;
while (i < curpos) {
if (r[j]) {
carousel.addItem(getImageTag(r[j]));
} else {
break;
}
i++;
j++;
}
carousel.set("selectedItem", carousel.get("firstVisible"));
},
failure: function (o) {
alert("Ajax request failed!");
}
});
}</textarea>
<p>
The getLargeImage() function is quite easy to implement. Since we have the
reference to the Carousel's item, it is straightforward to implement a function that extracts the image within it.
</p>
<textarea name="code" class="JScript" cols="60" rows="1">// Get the image link from within its (parent) container.
function getLargeImage(parent) {
var el = parent.firstChild;
while (el) { // walk through till as long as there's an element
if (el.nodeName.toUpperCase() == "IMG") { // found an image
// flickr uses "_s" suffix for small, and "_m" for big images respectively
return el.src.replace(/_s\.jpg$/, "_m.jpg");
}
el = el.nextSibling;
}
return "";
}</textarea>
<h2>Configuration for This Example</h2>
<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?connection&carousel&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
</div>
<div class="yui-u">
<div id="loggerModule" class="yui-skin-sam">
<h3 class="firstContent">YUI Logger Output:</h3>
<div id="loggerDiv"></div>
<div id="loggerGloss">
<p><strong>Note:</strong> You are viewing this example in debug mode with logging enabled. This can significantly slow performance.</p>
<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="csl_dynload2.html">Reload with logging<br />and debugging disabled.</a></span></span></p>
</div>
</div>
<div id="examples">
<h3>Carousel Control Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../carousel/csl_selection.html'>Spotlight example</a></li><li><a href='../carousel/csl_circular.html'>Circular Carousel example</a></li><li><a href='../carousel/csl_reveal.html'>Partially revealing previous and next items</a></li><li><a href='../carousel/csl_imagentext.html'>Using both images and text within an item</a></li><li class='selected'><a href='../carousel/csl_dynload2.html'>Using Ajax for deferred loading of items</a></li><li><a href='../carousel/csl_dynloadandreplace.html'>Using deferred loading of items and Carousel's built-in paginator</a></li><li><a href='../carousel/csl_multirow.html'>Multi-row example</a></li><li><a href='../carousel/csl_paginationtemplate.html'>Pagination template example</a></li><li><a href='../carousel/csl_pagination.html'>Using Paginator with Carousel</a></li><li><a href='../carousel/carousel-ariaplugin.html'>Using the Carousel ARIA Plugin</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More Carousel Control Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/carousel/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_carousel.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/carousel.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
</div>
</div>
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