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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: ProgressBar Control: Ratings</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/datatable/assets/skins/sam/datatable.css" />
<link rel="stylesheet" type="text/css" href="../../build/progressbar/assets/skins/sam/progressbar.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/datasource/datasource-min.js"></script>
<script type="text/javascript" src="../../build/dom/dom-min.js"></script>
<script type="text/javascript" src="../../build/element/element-min.js"></script>
<script type="text/javascript" src="../../build/datatable/datatable-min.js"></script>
<script type="text/javascript" src="../../build/progressbar/progressbar-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">
.yui-skin-sam .ratings {
background: transparent url(../progressbar/assets/star-bg.png) repeat-x 0 0;
border:0;
}
.yui-skin-sam .ratings .yui-pb-mask {
border:0;
}
.yui-skin-sam .ratings .yui-pb-bar {
background: transparent url(../progressbar/assets/star.png) repeat-x 0 0;
}
/* Just a little decoration for the page, not relevant to the usage of the progress bar */
.dp-highlighter th, .dp-highlighter td {
border:0;
padding:0;
}
.dp-highlighter .line1, .dp-highlighter .line2 {
padding-left:10px;
white-space:nowrap;
}
</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: ProgressBar Control: Ratings</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>ProgressBar Control: Ratings</h1>
<div class="exampleIntro">
<p>The ProgressBar can be used within other widgets. Here we are using Yahoo! Query Language, <a href="http://developer.yahoo.com/yql/">YQL</a>, to find sushi restaurants in San Francisco, CA and display the information in a <a href="http://developer.yahoo.com/yui/datatable/">DataTable</a>. We are showing most of the fields as plain text, but the restaurant ratings are displayed using the ProgressBar.</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="pb_ratings_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="Container"></div>
<script type="text/javascript" src="assets/YQLDataSource.js"></script>
<script type="text/javascript">
YAHOO.util.Event.onDOMReady(function () {
YAHOO.util.Event.onDOMReady(function () {
var pbs = [];
var ratingFormatter = function (elLiner, oRecord, oColumn, oData) {
var pb = new YAHOO.widget.ProgressBar({
width:'90px',
height:'18px',
maxValue:5,
className:'ratings',
value:oData
}).render(elLiner);
pbs.push(pb);
};
var dt = new YAHOO.widget.DataTable(
'Container',
[
{key:"Title",sortable:true},
{key:"Address",sortable:true},
{key:"Phone",sortable:true},
{key:"Rating.AverageRating",label:"Rating", sortable:true, formatter:ratingFormatter}
],
new YAHOO.util.YQLDataSource(null, {responseSchema:{fields:[{key:"Rating.AverageRating",parser:"number"}]}}),
{
initialRequest:'select Title,Address,Phone, Rating.AverageRating from local.search where query="sushi" and location="san francisco, ca"'
}
);
dt.on('beforeRenderEvent',function() {
for (var i = 0; i<pbs.length; i++) {
pbs[i].destroy();
}
pbs = [];
});
});
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<p>The Rating.AverageRating values from the YQL response are displayed as YUI ProgressBars.
The YQL query for this example is:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
select Title,Address,Phone, Rating.AverageRating from local.search
where query="sushi" and location="san francisco, ca"
</textarea>
<p>which can be tested by pasting it into the <a href="http://developer.yahoo.com/yql/console/">YQL Console</a>.
We are using <a href="../datasource/datasource_yql.html">YQLDataSource, a subclass of DataSource</a> to handle
the communication with YQL for us.</p>
<p>The code to build the DataTable on that query is:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
var dt = new YAHOO.widget.DataTable(
'Container',
[
{key:"Title", sortable:true},
{key:"Address", sortable:true},
{key:"Phone", sortable:true},
{key:"Rating.AverageRating", label:"Rating", formatter:ratingFormatter, sortable:true}
],
new YAHOO.util.YQLDataSource(null, {responseSchema:{fields:[{key:"Rating.AverageRating",parser:"number"}]}}),
{
initialRequest:'select Title, Address, Phone, Rating.AverageRating from local.search where query="sushi" and location="san francisco, ca"'
}
);
</textarea>
<p>We create a simple DataTable with the columns Title, Address and Phone as simple
text fields that are displayed just as they are received. A fourth column receives
data held in the nested field Rating.AverageRating. We use a custom formatter to
render ProgressBars instead of showing the plain numbers. All columns are sortable, even the Ratings column.</p>
<p>The <code>ratingFormatter</code> is the function that will create the ProgressBars:<p>
<textarea name="code" class="JScript" cols="60" rows="1">
var pbs = [];
var ratingFormatter = function (elLiner, oRecord, oColumn, oData) {
var pb = new YAHOO.widget.ProgressBar({
width:'90px',
height:'18px',
maxValue:5,
className:'ratings',
value:oData
}).render(elLiner);
pbs.push(pb);
};
</textarea>
<p>The core of it is the creation of the ProgressBar 90px wide and 18px high. We
set this size because our star image is a 18-pixel square and we want to fit
up to five stars horizontally. Five is, indeed, the <code>maxValue</code> that the rating
might reach. We add a className <code>"ratings"</code> to the widget, which will help us with some formatting details
and, finally, we set the current value for the progressBar to the cell value.</p>
<p>Every time the DataTable is sorted or redrawn for any reason (such as call to the <code>render</code> method or paging),
the formatter function will be called again. As with any widget, the ProgressBar might take resources that might not be
automatically cleared by the garbage collector, so it is vital to call <code>destroy</code> method to make sure all such
resources are cleared. We store each ProgressBar instance in the array <code>pbs</code>. Before any render,
we iterate over this array and destroy every instance we have stored.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
dt.on('beforeRenderEvent',function() {
for (var i = 0; i<pbs.length; i++) {
pbs[i].destroy();
}
pbs = [];
});
</textarea>
<p></p>
<p>We have applied the <code>yui-skin-sam</code> as a skin for all the widgets
of the page, (the DataTable and ProgressBars), so we need to
override some of these settings in order to set the stars images.
The stars come from a two images (a red star and a gray star) which are tiled to fill the allotted space.
We gave the <code>ratings</code> className to all the ProgressBars
as an argument at instantiation, so we can use <code>.yui-skin-sam .ratings</code> as a selector in our custom styles:</p>
<textarea name="code" class="CSS" cols="60" rows="1">
.yui-skin-sam .ratings {
background: transparent url(star-bg.png) repeat-x 0 0;
border:0;
}
.yui-skin-sam .ratings .yui-pb-mask {
border:0;
}
.yui-skin-sam .ratings .yui-pb-bar {
background: transparent url(star.png) repeat-x 0 0;
}
</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/?get&datasource&datatable&progressbar&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="pb_ratings_log.html">Reload with logging<br />
and debugging enabled.</a></span></span></p></div>
</div>
<div id="examples">
<h3>ProgressBar Control Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../progressbar/pb_basic.html'>Basic Features</a></li><li><a href='../progressbar/pb_events.html'>Events</a></li><li class='selected'><a href='../progressbar/pb_ratings.html'>Ratings</a></li><li><a href='../progressbar/pb_vumeter.html'>VU Meters</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More ProgressBar Control Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/progressbar/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_progressbar.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/progressbar.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
</div>
</div>
<div class="yui-b" id="tocWrapper">
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