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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: Slider Control: Bottom to top Vertical Slider</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/slider/assets/skins/sam/slider.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>
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<script type="text/javascript" src="../../build/animation/animation-min.js"></script>
<script type="text/javascript" src="../../build/dragdrop/dragdrop-min.js"></script>
<script type="text/javascript" src="../../build/slider/slider-debug.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">
#slide_bg {
position: relative;
background: url(../slider/assets/bg-v.gif) 12px 0 no-repeat;
height: 228px;
width: 48px;
}
#slide_thumb {
cursor: default;
position: absolute;
top: 200px;
}
</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">
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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</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: Slider Control: Bottom to top Vertical Slider</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>Slider Control: Bottom to top Vertical Slider</h1>
<div class="exampleIntro">
<p>This example demonstrates a vertical implementation of the <a href="http://developer.yahoo.com/yui/slider/">YUI Slider Control</a>. Some characteristics of this implementation include the following:</p>
<ul>
<li>The slider range is 200 pixels.</li>
<li>CSS is used to place the slide thumb at the bottom of the slider.</li>
<li>Custom logic is added to the slider instance to convert the offset value to a "real" value calculated from a provided min/max range.</li>
<li>The custom min value is set to 10; the max 110.</li>
<li>Once the slider has focus, the up and down keys will move
the thumb 20 pixels (changing the "real" value by 10).</li>
<li>When the slider value changes, the pixel offset and calculated value are reported below the slider.</li>
</ul>
</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="slider_vert_swapped_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="demo">
<div id="slide_bg" tabindex="-1">
<div id="slide_thumb"><img src="assets/thumb-bar.gif"></div>
</div>
<p>Pixel offset from start: <span id="d_offset">0</span></p>
<p>Calculated Value: <span id="d_val">0</span></p>
</div>
<script type="text/javascript">
YAHOO.util.Event.onDOMReady(function () {
// the slider can move up 200 pixels
var upLimit = 200;
// and down 0 pixels
var downLimit = 0;
// Create the Slider instance
var slider = YAHOO.widget.Slider.getVertSlider(
'slide_bg', 'slide_thumb', upLimit, downLimit);
// Add a little functionality to the instance
YAHOO.lang.augmentObject(slider, {
// A custom value range for the slider
minValue : 10,
maxValue : 110,
// A method to retrieve the calculated value, per the value range
getCalculatedValue : function () {
// invert the offset value so "real" values increase as the
// slider moves up
var offset = -1 * this.getValue();
// Convert the offset to a value in our configured range
var conversionFactor =
(this.maxValue - this.minValue) /
(this.thumb.topConstraint + this.thumb.bottomConstraint);
return Math.round(offset * conversionFactor) + this.minValue;
}
});
// display the native offset and the calculated while sliding
var offset_span = YAHOO.util.Dom.get('d_offset');
var calc_span = YAHOO.util.Dom.get('d_val');
slider.subscribe('change', function (offsetFromStart) {
offset_span.innerHTML = offsetFromStart;
calc_span.innerHTML = this.getCalculatedValue();
});
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h2 class="first">Building a Bottom-Up Vertical Slider</h2>
<p>You supply your own markup for the slider. Keep in mind the following points about markup for <a href="http://developer.yahoo.com/yui/slider/">YUI Slider Control</a> implementations:</p>
<ul>
<li>The thumb element should be a child of the slider background</li>
<li>The tabindex attribute lets this element receive focus in most browsers.</li>
<li>If the slider background can receive focus, the arrow keys can be used to change
this slider's value.</li>
<li>We use an <code><img></code> element rather than a CSS background for the thumb to get around
a performance bottleneck when animating the thumb's position in IE.</li>
<li>Both elements should have an explicit CSS position: <code>relative</code> or <code>absolute</code>.</li>
<li>Don't apply a CSS border to the slider background</li>
</ul>
<p>CSS:</p>
<textarea name="code" class="CSS" cols="60" rows="1">
#slide_bg {
position: relative;
background: url(assets/bg-v.gif) 12px 0 no-repeat;
height: 228px;
width: 48px;
}
#slide_thumb {
cursor: default;
position: absolute;
top: 200px; /* To initialize the slide thumb at the bottom */
}
</textarea>
<p>Markup:</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<div id="demo">
<div id="slide_bg" tabindex="-1">
<div id="slide_thumb"><img src="assets/thumb-bar.gif"></div>
</div>
<p>Pixel offset from start: <span id="d_offset"></span></p>
<p>Calculated Value: <span id="d_val"></span></p>
</div>
</textarea>
<h2>Invert the <code>getValue</code> offset</h2>
<p>Offset values returned by the <code>getValue()</code> methods, or passed as a parameter to the <code>change</code> event callback, increase as the slider moves left-to-right and top-to-bottom. Making the value increase in the opposite direction is as simple as multiplying by -1.</p>
<p>Look for the magic in this code:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
YAHOO.util.Event.onDOMReady(function () {
// the slider can move up 200 pixels
var upLimit = 200;
// and down 0 pixels
var downLimit = 0;
// Create the Slider instance
var slider = YAHOO.widget.Slider.getVertSlider(
'slide_bg', 'slide_thumb', upLimit, downLimit);
// Add a little functionality to the instance
YAHOO.lang.augmentObject(slider, {
// A custom value range for the slider
minValue : 10,
maxValue : 110,
// A method to retrieve the calculated value, per the value range
getCalculatedValue : function () {
// HERE'S THE MAGIC
// invert the offset value so "real" values increase as the
// slider moves up
var offset = -1 * this.getValue();
// Convert the offset to a value in our configured range
var conversionFactor =
(this.maxValue - this.minValue) /
(this.thumb.topConstraint + this.thumb.bottomConstraint);
return Math.round(offset * conversionFactor) + this.minValue;
}
});
// display the native offset and the calculated while sliding
var offset_span = YAHOO.util.Dom.get('d_offset');
var calc_span = YAHOO.util.Dom.get('d_val');
slider.subscribe('change', function (offsetFromStart) {
offset_span.innerHTML = offsetFromStart;
calc_span.innerHTML = this.getCalculatedValue();
});
});
</textarea>
<p>For horizontal Sliders, multiplying the offset by -1 makes values increase right-to-left.</p>
<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&slider&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="slider_vert_swapped.html">Reload with logging<br />and debugging disabled.</a></span></span></p>
</div>
</div>
<div id="examples">
<h3>Slider Control Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../slider/slider-simple.html'>Basic Vertical Slider</a></li><li><a href='../slider/slider-ticks.html'>Horizontal Slider with Tick Marks</a></li><li><a href='../slider/slider-rgb.html'>RGB Slider Control</a></li><li class='selected'><a href='../slider/slider_vert_swapped.html'>Bottom to top Vertical Slider</a></li><li><a href='../slider/slider_dual_thumb.html'>Horizontal Slider with two thumbs</a></li><li><a href='../slider/slider_dual_with_highlight.html'>Dual-thumb Slider with range highlight</a></li><li><a href='../progressbar/pb_basic.html'>Basic Features (included with examples for ProgressBar Control)</a></li><li><a href='../progressbar/pb_events.html'>Events (included with examples for ProgressBar Control)</a></li><li><a href='../button/btn_example14.html'>Slider Button (included with examples for Button 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 Slider Control Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/slider/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_slider.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/slider.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
</div>
</div>
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