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232 lines
18 KiB
HTML
232 lines
18 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>YUI Library Examples: ImageLoader Utility: Loading Images Below the Fold</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
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<style>
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/*Supplemental CSS for the YUI distribution*/
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#custom-doc { width: 95%; min-width: 950px; }
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#pagetitle {background-image: url(../../assets/bg_hd.gif);}
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</style>
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<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
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<!--Script and CSS includes for YUI dependencies on this page-->
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<link rel="stylesheet" type="text/css" href="../../build/logger/assets/skins/sam/logger.css" />
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<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
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<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
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<script type="text/javascript" src="../../build/event/event-min.js"></script>
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<script type="text/javascript" src="../../build/dom/dom-min.js"></script>
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<script type="text/javascript" src="../../build/logger/logger-min.js"></script>
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<script type="text/javascript" src="../../build/imageloader/imageloader-debug.js"></script>
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<script type="text/javascript" src="../../build/element/element-min.js"></script>
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<script type="text/javascript" src="../../build/button/button-min.js"></script>
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<!--there is no custom header content for this example-->
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<script type="text/javascript">
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//enable passthrough of errors from YUI Event:
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if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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YAHOO.util.Event.throwErrors = true;
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}
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</script>
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</head>
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<body id="yahoo-com" class="yui-skin-sam">
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<div id="custom-doc" class="yui-t2">
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<div id="hd">
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<div id="ygunav">
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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<form action="http://search.yahoo.com/search" id="sitesearchform">
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<input name="vs" type="hidden" value="developer.yahoo.com">
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<input name="vs" type="hidden" value="yuiblog.com">
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<div id="sitesearch">
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<label for="searchinput">Site Search (YDN & YUIBlog): </label>
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<input type="text" id="searchinput" name="p">
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<input type="submit" value="Search" id="searchsubmit" class="ygbt">
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</div>
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</form> </div>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
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<div id="pagetitle"><h1>YUI Library Examples: ImageLoader Utility: Loading Images Below the Fold</h1></div>
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</div>
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<div id="bd">
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<div id="yui-main">
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<div class="yui-b">
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<div class="yui-ge">
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<div class="yui-u first example">
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<div class="promo">
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<h1>ImageLoader Utility: Loading Images Below the Fold</h1>
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<div class="exampleIntro">
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<p>Often pages will have a number of images below the fold, hidden from the user's view. These are prime candidates to load with the <a href="http://developer.yahoo.com/yui/imageloader/">ImageLoader Utility</a>.</p>
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<p>All the images in this example belong to the same group, and all load immediately only if they appear above the fold of the page.</p>
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</div>
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<div class="example-container module ">
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<div class="hd exampleHd">
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<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="imgloadfold_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
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</div> <div id="example-canvas" class="bd">
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
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<style>
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.everything .cont { border:1px solid #888; width:100px; margin:25px 50px; }
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.everything .right { margin-left:300px; }
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#img1Cont, #img5Cont { height:75px; }
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#img2Cont { height:67px; }
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#img3Cont { height:53px; }
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#img4Cont { height:72px; }
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</style>
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<div class='everything' id='everything'>
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<div class='cont' id='img1Cont'>
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<img id='img1' />
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</div>
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<div class='cont right' id='img2Cont'>
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<img id='img2' />
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</div>
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<div class='cont' id='img3Cont'>
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<img id='img3' />
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</div>
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<div class='cont right' id='img4Cont'>
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<img id='img4' />
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</div>
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<div class='cont' id='img5Cont'>
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<img id='img5' />
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</div>
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</div>
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<script>
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var foldGroup = new YAHOO.util.ImageLoader.group(window, 'scroll');
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foldGroup.registerSrcImage('img1', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/museum.jpg');
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foldGroup.registerSrcImage('img2', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/uluru.jpg');
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foldGroup.registerSrcImage('img3', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/katatjuta.jpg');
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foldGroup.registerSrcImage('img4', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/morraine.jpg');
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foldGroup.registerSrcImage('img5', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/japan.jpg');
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foldGroup.foldConditional = true;
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//foldGroup.addTrigger(window, 'resize');
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foldGroup.name = 'fold_group';
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/*
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* This uncustomary wait before adding the resize trigger is done specifically to cater to IE for this example.
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* In IE and with the Logger enabled, IE fires an immediate resize event while rendering the Logger module, consequently loading all the images in the example.
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* This 200 ms delay allows IE to render the Logger without interference.
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* In your code, you would add the resize trigger in a straightforward fashion, as is documented in the example.
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*/
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YAHOO.util.Event.addListener(window, 'load', function() { setTimeout("foldGroup.addTrigger(window, 'resize')", 200); });
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</script>
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<!--END SOURCE CODE FOR EXAMPLE =============================== -->
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</div>
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</div>
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</div>
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<h2 class='first'>Loading Images Below the Fold</h2>
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<p>You can easily have images load immediately if they are above the fold while delaying the load of images below the fold. This saves you from loading any images that the user can't see at page load because they're beyond her browser's viewable area.</p>
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<p>All we need is one group, and we set its <code>foldConditional</code> flag to true. Any group with this flag set will, during the page's onload function, examine the page coordinates of all images registered to that group. Any images located above the fold will load immediately. The rest will wait for the group's triggers or time limit.</p>
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<textarea name='code' class='JScript' cols='60' rows='1'>
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var foldGroup = new YAHOO.util.ImageLoader.group(window, 'scroll');
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foldGroup.registerSrcImage('img1', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/museum.jpg');
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foldGroup.registerSrcImage('img2', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/uluru.jpg');
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foldGroup.registerSrcImage('img3', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/katatjuta.jpg');
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foldGroup.registerSrcImage('img4', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/morraine.jpg');
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foldGroup.registerSrcImage('img5', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/japan.jpg');
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foldGroup.foldConditional = true;
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foldGroup.addTrigger(window, 'resize');
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</textarea>
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<p>As is customary with a "foldConditional" group, we have defined two triggers for this group. Both of these alter the viewable area of the browser: the <code>scroll</code> and <code>resize</code> events of the window.</p>
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<p>How do you know that the images below the fold are, in fact, not loaded immediately? There are several tools available to monitor the HTTP requests of your browser, including Firebug for Firefox and HTTPWatch for IE. With these tools you can monitor precisely when each image on a page is loaded.</p>
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<h2>Configuration for This Example</h2>
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<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/?imageloader&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
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</div>
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<div class="yui-u">
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<div id="loggerModule" class="yui-skin-sam">
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<h3 class="firstContent">YUI Logger Output:</h3>
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<div id="loggerDiv"></div>
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</div>
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<div id="examples">
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<h3>ImageLoader Utility Examples:</h3>
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<div id="exampleToc">
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<ul>
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<li><a href='../imageloader/imgloadbasics.html'>Basic Features of the ImageLoader Utility</a></li><li class='selected'><a href='../imageloader/imgloadfold.html'>Loading Images Below the Fold</a></li><li><a href='../imageloader/imgloadclass.html'>Using ImageLoader with CSS Class Names</a></li><li><a href='../imageloader/imgloadtabs.html'>ImageLoader with TabView</a></li> </ul>
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</div>
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</div>
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<div id="module">
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<h3>More ImageLoader Utility Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/imageloader/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_imageloader.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/imageloader.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="yui-b" id="tocWrapper">
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<!-- TABLE OF CONTENTS -->
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<div id="toc">
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<ul>
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<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! User Interface Blog" href="http://yuiblog.com">YUIBlog (external)</a></li><li class="item"><a title="YUILibrary.com hosts the YUI community forums" href="http://yuilibrary.com/forum/">YUI Discussion Forum (external)</a></li><li class="item"><a title="The YUI Library source can be checked out from GitHub" href="http://github.com/yui/">YUI on GitHub</a></li><li class="item"><a title="Instantly searchable API documentation for the entire YUI library." href="../../docs/index.html">API Documentation</a></li><li class="item"><a title="Examples of every YUI utility and control in action" href="../../examples/">Functional Examples</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="item"><a title="YUI is free and open, offered under a BSD license." href="http://developer.yahoo.com/yui/license.html">YUI License (external)</a></li><li class="sect">YUI Functional Examples</li><li class="item"><a title="The YUI Animation Utility - Functional Examples" href="../../examples/animation/index.html">Animation</a></li><li class="item"><a title="The YUI AutoComplete Control - Functional Examples" href="../../examples/autocomplete/index.html">AutoComplete</a></li><li class="item"><a title="The YUI Browser History Manager - Functional Examples" href="../../examples/history/index.html">Browser History Manager</a></li><li class="item"><a title="The YUI Button Control - Functional Examples" href="../../examples/button/index.html">Button</a></li><li class="item"><a title="The YUI Calendar Control - Functional Examples" href="../../examples/calendar/index.html">Calendar</a></li><li class="item"><a title="The YUI Carousel Control - Functional Examples" href="../../examples/carousel/index.html">Carousel</a></li><li class="item"><a title="The YUI Charts Control - Functional Examples" href="../../examples/charts/index.html">Charts</a></li><li class="item"><a title="The YUI Color Picker Control - Functional Examples" href="../../examples/colorpicker/index.html">Color Picker</a></li><li class="item"><a title="The YUI Cookie Utility - Functional Examples" href="../../examples/cookie/index.html">Cookie</a></li><li class="item"><a title="The YUI Connection Manager (AJAX) - Functional Examples" href="../../examples/connection/index.html">Connection Manager</a></li><li class="item"><a title="The YUI Container Family (Module, Overlay, Tooltip, Panel, Dialog, SimpleDialog) - Functional Examples" href="../../examples/container/index.html">Container</a></li><li class="item"><a title="The YUI DataTable Control - Functional Examples" href="../../examples/datatable/index.html">DataTable</a></li><li class="item"><a title="The YUI Dom Collection - Functional Examples" href="../../examples/dom/index.html">Dom</a></li><li class="item"><a title="The YUI Drag & Drop Utility - Functional Examples" href="../../examples/dragdrop/index.html">Drag & Drop</a></li><li class="item"><a title="The YUI Event Utility - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="The YUI Get Utility - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="The YUI ImageCropper Control - Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="selected "><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI ProgressBar Control - Functional Examples" href="../../examples/progressbar/index.html">ProgressBar</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="item"><a title="The YUI Storage Utility - Functional Examples" href="../../examples/storage/index.html">Storage</a></li><li class="item"><a title="The YUI SWF Utility - Functional Examples" href="../../examples/swf/index.html">SWF</a></li><li class="item"><a title="The YUI SWFStore Utility - Functional Examples" href="../../examples/swfstore/index.html">SWFStore</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="item"><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="item"><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - Functional Examples" href="../../examples/reset/index.html">Reset CSS</a></li><li class="item"><a title="YUI Base CSS - Functional Examples" href="../../examples/base/index.html">Base CSS</a></li><li class="item"><a title="YUI Fonts CSS - Functional Examples" href="../../examples/fonts/index.html">Fonts CSS</a></li><li class="item"><a title="YUI Grids CSS - Functional Examples" href="../../examples/grids/index.html">Grids CSS</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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</div>
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</div>
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</div><!--closes bd-->
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<div id="ft">
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<p class="first">Copyright © 2010 Yahoo! Inc. All rights reserved.</p>
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<p><a href="http://privacy.yahoo.com/privacy/us/devel/index.html">Privacy Policy</a> -
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<a href="http://docs.yahoo.com/info/copyright/copyright.html">Copyright Policy</a> -
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<a href="http://careers.yahoo.com/">Job Openings</a></p>
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