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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: AutoComplete Control: Screenreader Accessibility</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/autocomplete/assets/skins/sam/autocomplete.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/dom/dom-min.js"></script>
<script type="text/javascript" src="../../build/event/event-min.js"></script>
<script type="text/javascript" src="../../build/animation/animation-min.js"></script>
<script type="text/javascript" src="../../build/datasource/datasource-min.js"></script>
<script type="text/javascript" src="../../build/autocomplete/autocomplete-min.js"></script>
<script type="text/javascript" src="../../build/element/element-min.js"></script>
<script type="text/javascript" src="../../build/button/button-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
#myAutoComplete {
width:15em; /* set width here or else widget will expand to fit its container */
padding-bottom:2em;
}
</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">
<div id="sitesearch">
<label for="searchinput">Site Search (YDN &amp; YUIBlog): </label>
<input type="text" id="searchinput" name="p">
<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: AutoComplete Control: Screenreader Accessibility</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>AutoComplete Control: Screenreader Accessibility</h1>
<div class="exampleIntro">
<p>This AutoComplete example demonstrates how to make the widget more screenreader accessible.</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="ac_accessible_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
</div> <div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<div id="myAutoComplete">
<label id="myInputLabel" for="myInput">Enter a state:</label>&nbsp;<input id="myInput" type="text">
<div id="myContainer"></div>
</div>
<script type="text/javascript" src="assets/js/data.js"></script>
<script type="text/javascript">
YAHOO.example.Accessibility = function() {
// Set up DataSource and AutoComplete instances
var oDS = new YAHOO.util.LocalDataSource(YAHOO.example.Data.arrayStates, {responseSchema: {fields : ["state"]}});
var oAC = new YAHOO.widget.AutoComplete("myInput", "myContainer", oDS);
// Set up span element with screenreader text
var elLabel = YAHOO.util.Dom.get("myInputLabel"),
origLabel = elLabel.innerHTML,
screenreaderLabel = "<span style=\"position:absolute;left:-999em;\">Use the up and down arrow keys to navigate suggestions.</span>"
// Insert the screenreader text whenever user starts an AutoComplete interaction
oAC.textboxFocusEvent.subscribe(function(){elLabel.innerHTML += screenreaderLabel;});
oAC.textboxBlurEvent.subscribe(function(){elLabel.innerHTML = origLabel;});
// The typeAhead feature must also be set to true for screenreader support
oAC.typeAhead = true;
// Turn off autoHighlight for less confusion
oAC.autoHighlight = false;
return {
oDS: oDS,
oAC: oAC
};
}();
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<p>There are a few simple things you should do to make your AutoComplete implementation more screenreader accessible.</p>
<h2>Label your input field</h2>
<p>First, provide a <a href="http://www.w3.org/TR/html401/interact/forms.html#h-17.9">label element</a> for your input field. Within this label, you can include a span that is styled via CSS to be displayed offscreen with helpful text that screenreaders will read aloud.</p>
<h2>Insert the screenreader label text dynamically</h2>
<p>If you insert the span element that holds the screenreader text into the label dynamically at runtime, most screenreaders will read it aloud each time only when the user focuses on the input for a new AutoComplete interaction, instead of during regular page browsing.</p>
<h2>Enable the <code>typeAhead</code> feature</h2>
<p>By setting your AutoComplete's <code>typeAhead</code> property to true, screenreaders (in focus mode) will read aloud each suggestion as the user navigates them with the up and down arrow keys.</p>
<h2>Disable the <code>autoHighlight</code> feature</h2>
<p>By default, AutoComplete's <code>autoHighlight</code> property is enabled, which may add confusion when screenreaders read aloud the first suggestion when it is autohighlighted. To avoid this scenario, disable the <code>autoHighlight</code> feature.</p>
<h2 class="first">Sample Code</h2>
<p>Markup:</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<div id="myAutoComplete">
<label id="myInputLabel" for="myInput">Enter a state:</label> <input id="myInput" type="text">
<div id="myContainer"></div>
</div>
</textarea>
<p>JavaScript:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
YAHOO.example.Accessibility = function() {
// Set up DataSource and AutoComplete instances
var oDS = new YAHOO.util.LocalDataSource(YAHOO.example.Data.arrayStates, {responseSchema: {fields : ["state"]}});
var oAC = new YAHOO.widget.AutoComplete("myInput", "myContainer", oDS);
// Set up span element with screenreader text
var elLabel = YAHOO.util.Dom.get("myInputLabel"),
origLabel = elLabel.innerHTML,
screenreaderLabel = '<span style="position:absolute;left:-999em;">Use the arrow keys to navigate suggestions.</span>';
// Insert the screenreader text whenever user starts an AutoComplete interaction
oAC.textboxFocusEvent.subscribe(function(){elLabel.innerHTML += screenreaderLabel;});
oAC.textboxBlurEvent.subscribe(function(){elLabel.innerHTML = origLabel;});
// The typeAhead feature must also be set to true for screenreader support
oAC.typeAhead = true;
// Turn off autoHighlight for less confusion
oAC.autoHighlight = false;
return {
oDS: oDS,
oAC: oAC
};
}();
</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/?animation&datasource&autocomplete&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="loggerGloss"><p><strong>Note:</strong> Logging and debugging is currently turned off for this example.</p>
<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="ac_accessible_log.html">Reload with logging<br />
and debugging enabled.</a></span></span></p></div>
</div>
<div id="examples">
<h3>AutoComplete Control Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../autocomplete/ac_basic_array.html'>Basic Local Data</a></li><li><a href='../autocomplete/ac_basic_xhr.html'>Basic Remote Data</a></li><li class='selected'><a href='../autocomplete/ac_accessible.html'>Screenreader Accessibility</a></li><li><a href='../autocomplete/ac_xhr_customrequest.html'>Customizing Remote Requests</a></li><li><a href='../autocomplete/ac_formatting_proxyless.html'>Custom Formatting, with a Proxyless Remote DataSource</a></li><li><a href='../autocomplete/ac_itemselect.html'>Searching Field A, Submitting Field B with itemSelectEvent</a></li><li><a href='../autocomplete/ac_combobox.html'>Combobox, with CSS for Multiple Stacked Instances</a></li><li><a href='../autocomplete/ac_tags_alwaysshow.html'>Tagging Example with alwaysShowContainer</a></li><li><a href='../autocomplete/ac_fn_multfields.html'>FunctionDataSource to Search Multiple Fields of an Address Book at Runtime</a></li><li><a href='../autocomplete/ac_ysearch_json.html'>Centering AutoComplete On a Page</a></li><li><a href='../autocomplete/ac_ysearch_flat.html'>Subset Matching</a></li><li><a href='../autocomplete/ac_flickr_xml.html'>Find Photos on Flickr</a></li><li><a href='../autocomplete/ac_customize.html'>Configurations Dashboard</a></li><li><a href='../autocomplete/ac_skinning.html'>Skinning Model</a></li><li><a href='../editor/flickr_editor.html'>Flickr Image Search (included with examples for Rich Text Editor)</a></li><li><a href='../logger/log_autocomplete.html'>Logger Integration with YUI Components (included with examples for Logger Control)</a></li><li><a href='../datatable/dt_autocomplete.html'>Datatable with Autocomplete (included with examples for DataTable Control)</a></li><li><a href='../layout/adv_layout.html'>Complex Application (included with examples for Layout Manager)</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More AutoComplete Control Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/autocomplete/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_autocomplete.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/autocomplete.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
</div>
</div>
<div class="yui-b" id="tocWrapper">
<!-- TABLE OF CONTENTS -->
<div id="toc">
<ul>
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