Mercurial > hg > extraction-interface

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<html>
<head>
<title>Slider (WebFX)</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="local/webfxlayout.js"></script>

<script type="text/javascript" src="js/range.js"></script>
<script type="text/javascript" src="js/timer.js"></script>
<script type="text/javascript" src="js/slider.js"></script>
<link type="text/css" rel="StyleSheet" href="css/bluecurve/bluecurve.css" />

</head>
<body>
<!-- WebFX Layout Include -->
<script type="text/javascript">

var articleMenu= new WebFXMenu;
articleMenu.left  = 384;
articleMenu.top   = 86;
articleMenu.width = 140;
articleMenu.add(new WebFXMenuItem("Slider", "slider.html"));
articleMenu.add(new WebFXMenuItem("Implementation", "implementation.html"));
articleMenu.add(new WebFXMenuItem("API", "api.html"));
articleMenu.add(new WebFXMenuItem("Demo", "demo.html"));
articleMenu.add(new WebFXMenuSeparator);
articleMenu.add(new WebFXMenuItem("Download", "http://webfx.eae.net/download/slider102.zip"));
webfxMenuBar.add(new WebFXMenuButton("Article Menu", null, null, articleMenu));

webfxLayout.writeTitle("Slider");
webfxLayout.writeMenu();
webfxLayout.writeDesignedByEdger();

</script>
<div class="webfx-main-body">
<!-- end WebFX Layout Includes -->

<p>
	<span class="date">2002-10-07</span>: First public version released<br />
	<span class="date">2006-05-28</span>: Changed license to Apache Software License 2.0.<br />
</p>

<h2>Introduction</h2>

<p>Sliders are useful controls for choosing a value in a range of values.
Common uses are volume controls, seekers for movie and sound files as well
as color pickers. A few people have asked for an update to the old
<a href="http://webfx.eae.net/dhtml/slidebar/slidebar.html">Slidebar</a>
component to make it work in Mozilla and work better in IE. But since the
original control was very basic and was not very usable I decided to
create a new one.</p>

<form onsubmit="return false;">
<div class="slider" id="slider-1" tabIndex="1" style="width: auto; margin: 10px;">
	<input class="slider-input" id="slider-input-1"/>
</div>
</form>

<script type="text/javascript">

var sliderEl = document.getElementById ? document.getElementById("slider-1") : null;
var inputEl = document.forms[0]["slider-input-1"];
var s = new Slider(sliderEl, inputEl);
s.onchange = function () {
	window.status = "Value: " + s.getValue();
};
s.setValue(50);

</script>

<p>When starting with the new slider a few main features where kept in mind:</p>

<ul>
	<li>Degrade gracefully for browser without the needed DOM support. This is
		achieved by using a basic text input as the base for the control. In case
		the browser does not support the needed features then the input can be used
		in the normal way.</li>
	<li>Full mouse support. Lots of slider controls does not support anything beyond dragging
		the handle. The goal was to allow the user to be able to both drag the handle
		and hold down the mouse anywhere on the slider to move the handle towards the
		mouse.</li>
	<li>Full keyboard support. Once the slider is focused the arrow keys and Page Up /
		Page Down can be used to change the value.</li>
	<li>Mouse wheel support where available.</li>
	<li>Skinable using different CSS files.</li>
</ul>

<h2>Requirements</h2>

<p>The slider works in <strong>any</strong> browser but the GUI component works in
browsers with simple DOM level 1 support with one IE extended proprietary property.
That property is <code>offsetWidth</code> (and <code>offsetHeight</code>) and this is
known to be supported by IE5+, Mozilla 1.0+, Konqueror 3+ and it is assumed other future
browsers will support this as well because it has become a de facto standard.</p>

<h2>Usage</h2>

<p>To use the slider we have to include a few JS files and a CSS file.</p>

<pre>
&lt;script type="text/javascript" src="<a href="js/range.js">js/range.js</a>"&gt;&lt;/script&gt;
&lt;script type="text/javascript" src="<a href="js/timer.js">js/timer.js</a>"&gt;&lt;/script&gt;
&lt;script type="text/javascript" src="<a href="js/slider.js">js/slider.js</a>"&gt;&lt;/script&gt;
&lt;link type="text/css" rel="StyleSheet" href="<a href="css/winclassic.css">css/winclassic.css</a>" /&gt;
</pre>

<p>Then we need to define the HTML to use for the slider. Something like this:</p>

<pre>
&lt;div class="slider" id="slider-1" tabIndex="1"&gt;
   &lt;input class="slider-input" id="slider-input-1"
      name="slider-input-1"/&gt;
&lt;/div&gt;
</pre>

<p>After this we have to create the JS object that handles the logic. If we only
plan to use this in pages and applications that you know will support the dynamic
slider control we can use the following script block. This should be placed directly
after the slider div.</p>

<pre>
&lt;script type="text/javascript"&gt;

var s = new Slider(document.getElementById("slider-1"),
                   document.getElementById("slider-input-1"));

&lt;/script&gt;
</pre>

<p>If we however cannot guarantee that all user uses browsers that support
<code>document.getElementById</code> we should use <code>document.forms</code>
to find the input and test whether <code>document.getElementById</code> is
defined.</p>

<pre>
&lt;script type="text/javascript"&gt;

var sliderEl = document.getElementById ?
                  document.getElementById("slider-1") : null;
var inputEl = document.forms[0]["slider-input-1"];
var s = new Slider(sliderEl, inputEl);

&lt;/script&gt;
</pre>

<p>
<a href="slider.html">Slider</a><br />
<a href="implementation.html">Implementation</a><br />
<a href="api.html">API</a><br />
<a href="demo.html">Demo</a><br />
<a href="http://webfx.eae.net/download/slider102.zip">Download</a>
</p>

<p class="author">Author: Erik Arvidsson</p>

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</div>

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author	Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date	Fri, 13 Mar 2015 09:55:07 +0100
parents	b12c99b7c3f0
children