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<title>YUI Library Examples: ProgressBar Control: Events</title>
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position: absolute; /* for ie7 and ie8 */
}
#minValueContainer {
float:left;
}
#maxValueContainer {
float:right;
}
#status {
text-align:center;
}
#pbContainer .yui-pb-bar {
background-color: rgb(127,127,127);
background-image: none;
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//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
YAHOO.util.Event.throwErrors = true;
}
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<div id="pagetitle"><h1>YUI Library Examples: ProgressBar Control: Events</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: Events</h1>
<div class="exampleIntro">
<p>This example shows how you can use the events that ProgressBar fires.</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_events_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="containers">
<div id="pbContainer"></div>
<div id="textContainers">
<div id="minValueContainer" class="yui-pb-range">0</div>
<div id="maxValueContainer" class="yui-pb-range">255</div>
<div class="yui-pb-caption">
<span id="valueContainer">127</span>
<span id="status"></span>
</div>
</div>
</div>
<fieldset id="control">
<legend>Control</legend>
<fieldset id="valueSet">
<legend>Value</legend>
<div id="sliderValue" class="yui-h-slider" tabindex="-1" title="Value slider">
<div id="sliderValueThumb" class="yui-slider-thumb"><img src="../progressbar/assets/thumb-n.gif"></div>
</div>
</fieldset>
<fieldset id="rangeSet">
<legend>Range</legend>
<div id="sliderRange" class="yui-h-slider" title="Range slider">
<div id="sliderRangeMinThumb" class="yui-slider-thumb"><img src="../progressbar/assets/thumb-e.gif"></div>
<div id="sliderRangeMaxThumb" class="yui-slider-thumb"><img src="../progressbar/assets/thumb-w.gif"></div>
</div>
</fieldset>
</fieldset>
<script type="text/javascript">
// Workaround for bug #2528312
//YAHOO.widget.Slider.prototype.baselinePos = [];
YAHOO.util.Event.onDOMReady( function () {
var Dom = YAHOO.util.Dom;
var pb = new YAHOO.widget.ProgressBar({
value:127,
maxValue:255,
anim:true
}).render('pbContainer');
var anim = pb.get('anim');
anim.duration = 3;
anim.method = YAHOO.util.Easing.bounceBoth;
pb.on('start',function (value) {
Dom.get('status').innerHTML = 'Started';
window.setTimeout(function() {
Dom.get('status').innerHTML = '';
},1000);
});
pb.on('progress',function (value) {
Dom.setStyle(this.get('barEl'),'backgroundColor','rgb(' + value + ',' + value + ',127)');
Dom.get('valueContainer').innerHTML = value;
});
pb.on('complete',function (value) {
Dom.get('status').innerHTML = 'Stopped';
window.setTimeout(function() {
Dom.get('status').innerHTML = '';
},1000);
});
pb.on('minValueChange',function(oArgs) {
Dom.get('minValueContainer').innerHTML = oArgs.newValue;
});
pb.on('maxValueChange',function(oArgs) {
Dom.get('maxValueContainer').innerHTML = oArgs.newValue;
});
// From here on, it is mostly handling of the Sliders
var valueSlider = YAHOO.widget.Slider.getHorizSlider('sliderValue',
'sliderValueThumb', 0, 200, 0
);
valueSlider.setValue(100,true,true,true);
valueSlider.animate = false;
var valueScale = 1.275, minValue = 0;
valueSlider.subscribe("slideEnd", function() {
var value = Math.round(valueSlider.getValue() * valueScale + minValue);
pb.set('value',value);
window.setTimeout(function() {
valueSlider.setValue((pb.get('value') - minValue)/ valueScale,true,true,true);
},1);
});
var rangeSlider = YAHOO.widget.Slider.getHorizDualSlider("sliderRange",
"sliderRangeMinThumb", "sliderRangeMaxThumb",
200, 0, [0, 200]
);
rangeSlider.animate = false;
rangeSlider.subscribe('slideEnd', function() {
minValue = Math.round(this.minVal * 1.275);
pb.set('minValue',minValue);
var maxValue = Math.round(this.maxVal * 1.275);
pb.set('maxValue',maxValue);
valueScale = (maxValue - minValue) / 200;
valueSlider.setValue((pb.get('value') - minValue) / valueScale,true,true,true);
});
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<p>The code to create the ProgressBar is:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
var pb = new YAHOO.widget.ProgressBar({
value:127,
maxValue:255,
anim:true
}).render('pbContainer');
var anim = pb.get('anim');
anim.duration = 3;
anim.method = YAHOO.util.Easing.bounceBoth;
</textarea>
<p>We instantiate the ProgressBar and configure it so that the initial value is 127, which is halfway
between 0 and 255. We chose this range so that the values can translate directly into color values,
which we then apply to the bar. The ProgressBar uses an Animation instance which we can get and access
directly to set its duration and easing method.</p>
<p>We are listening to the three events related to movement:</p>
<ul>
<li><code>start</code> signals the start of the movement</li>
<li><code>progress</code> is fired during the movement</li>
<li><code>complete</code> signals the completion of the movement</li>
</ul>
<p>Without animation, the <code>start</code>, <code>progress</code>
and <code>complete</code> events fire one after the other in close sequence.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
pb.on('start',function (value) {
Dom.get('status').innerHTML = 'Started';
window.setTimeout(function() {
Dom.get('status').innerHTML = '';
},1000);
});
pb.on('progress',function (value) {
Dom.setStyle(this.get('barEl'),'backgroundColor','rgb(' + value + ',' + value + ',127)');
Dom.get('valueContainer').innerHTML = value;
});
pb.on('complete',function (value) {
Dom.get('status').innerHTML = 'Stopped';
window.setTimeout(function() {
Dom.get('status').innerHTML = '';
},1000);
});
</textarea>
<p>Our event handlers do a few simple things:</p>
<ul>
<li>we display 'Started' for one second upon receiving the <code>start</code> event</li>
<li>we change the color of the bar itself to reflect the <code>value</code> received from the <code>progress</code> event</li>
<li>we show the current value right below the bar (all events provide the <code>value</code>)</li>
<li>we display 'Stopped' upon receiving the <code>complete</code> event</li>
</ul>
<p>The <code>value</code> argument passed by all events provides the nominal value of the ProgresBar, not the size of the bar itself.
A value of 50 will always be halfway in a range of 0 to 100, whether the ProgressBar is 100 or 500 pixels wide.</p>
<p>We have also provided a slider to change the end values for the bar so that we can show how to respond to those
events and display their values. The ProgressBar inherits the attribute change events
from the <a href="http://developer.yahoo.com/yui/element/">Element Utility</a>, so before and after change events are available for all configuration attributes.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
pb.on('minValueChange',function(oArgs) {
Dom.get('minValueContainer').innerHTML = oArgs.newValue;
});
pb.on('maxValueChange',function(oArgs) {
Dom.get('maxValueContainer').innerHTML = oArgs.newValue;
});
</textarea>
<p>The markup for the text labels are shown below. Notice the <code>yui-pb-range</code> and <code>yui-pb-caption</code>
class names in their declaration. The ProgressBar itself does not use those class names at all, but they are defined as part of the "Sam"
skin as a convenience to the implementer.</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<div id="textContainers">
<div id="minValueContainer" class="yui-pb-range">0</div>
<div id="maxValueContainer" class="yui-pb-range">255</div>
<div class="yui-pb-caption">
<span id="valueContainer">127</span>
<span id="status"></span>
</div>
</div>
</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&slider&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="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="pb_events.html">Reload with logging<br />and debugging disabled.</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 class='selected'><a href='../progressbar/pb_events.html'>Events</a></li><li><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>
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