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Add screenreader text to prev/next carousel buttons in examples to improve accessibility
243 lines
9.9 KiB
HTML
243 lines
9.9 KiB
HTML
<div class="bs-docs-section">
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<h1 id="carousel" class="page-header">Carousel <small>carousel.js</small></h1>
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<h2 id="carousel-examples">Examples</h2>
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<p>The slideshow below shows a generic plugin and component for cycling through elements like a carousel.</p>
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<div class="bs-example">
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<div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
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<ol class="carousel-indicators">
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<li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
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<li data-target="#carousel-example-generic" data-slide-to="1"></li>
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<li data-target="#carousel-example-generic" data-slide-to="2"></li>
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</ol>
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<div class="carousel-inner" role="listbox">
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<div class="item active">
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<img data-src="holder.js/900x500/auto/#777:#555/text:First slide" alt="First slide">
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</div>
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<div class="item">
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<img data-src="holder.js/900x500/auto/#666:#444/text:Second slide" alt="Second slide">
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</div>
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<div class="item">
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<img data-src="holder.js/900x500/auto/#555:#333/text:Third slide" alt="Third slide">
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</div>
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</div>
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<a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
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<span class="glyphicon glyphicon-chevron-left"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
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<span class="glyphicon glyphicon-chevron-right"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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</div><!-- /example -->
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{% highlight html %}
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<div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
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<!-- Indicators -->
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<ol class="carousel-indicators">
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<li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
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<li data-target="#carousel-example-generic" data-slide-to="1"></li>
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<li data-target="#carousel-example-generic" data-slide-to="2"></li>
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</ol>
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<!-- Wrapper for slides -->
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<div class="carousel-inner" role="listbox">
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<div class="item active">
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<img src="..." alt="...">
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<div class="carousel-caption">
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...
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</div>
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</div>
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<div class="item">
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<img src="..." alt="...">
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<div class="carousel-caption">
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...
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</div>
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</div>
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...
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</div>
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<!-- Controls -->
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<a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
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<span class="glyphicon glyphicon-chevron-left"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
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<span class="glyphicon glyphicon-chevron-right"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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{% endhighlight %}
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<div class="bs-callout bs-callout-warning" id="callout-carousel-transitions">
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<h4>Transition animations not supported in Internet Explorer 8 & 9</h4>
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<p>Bootstrap exclusively uses CSS3 for its animations, but Internet Explorer 8 & 9 don't support the necessary CSS properties. Thus, there are no slide transition animations when using these browsers. We have intentionally decided not to include jQuery-based fallbacks for the transitions.</p>
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</div>
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<h3>Optional captions</h3>
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<p>Add captions to your slides easily with the <code>.carousel-caption</code> element within any <code>.item</code>. Place just about any optional HTML within there and it will be automatically aligned and formatted.</p>
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<div class="bs-example">
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<div id="carousel-example-captions" class="carousel slide" data-ride="carousel">
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<ol class="carousel-indicators">
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<li data-target="#carousel-example-captions" data-slide-to="0" class="active"></li>
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<li data-target="#carousel-example-captions" data-slide-to="1"></li>
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<li data-target="#carousel-example-captions" data-slide-to="2"></li>
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</ol>
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<div class="carousel-inner" role="listbox">
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<div class="item active">
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<img data-src="holder.js/900x500/auto/#777:#777" alt="First slide image">
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<div class="carousel-caption">
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<h3>First slide label</h3>
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<p>Nulla vitae elit libero, a pharetra augue mollis interdum.</p>
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</div>
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</div>
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<div class="item">
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<img data-src="holder.js/900x500/auto/#666:#666" alt="Second slide image">
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<div class="carousel-caption">
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<h3>Second slide label</h3>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
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</div>
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</div>
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<div class="item">
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<img data-src="holder.js/900x500/auto/#555:#5555" alt="Third slide image">
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<div class="carousel-caption">
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<h3>Third slide label</h3>
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<p>Praesent commodo cursus magna, vel scelerisque nisl consectetur.</p>
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</div>
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</div>
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</div>
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<a class="left carousel-control" href="#carousel-example-captions" role="button" data-slide="prev">
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<span class="glyphicon glyphicon-chevron-left"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="right carousel-control" href="#carousel-example-captions" role="button" data-slide="next">
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<span class="glyphicon glyphicon-chevron-right"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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</div><!-- /example -->
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{% highlight html %}
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<div class="item">
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<img src="..." alt="...">
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<div class="carousel-caption">
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<h3>...</h3>
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<p>...</p>
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</div>
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</div>
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{% endhighlight %}
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<div class="bs-callout bs-callout-danger">
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<h4>Accessibility issue</h4>
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<p>The carousel component is generally not compliant with accessibility standards. If you need to be compliant, please consider other options for presenting your content.</p>
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</div>
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<h2 id="carousel-usage">Usage</h2>
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<h3>Multiple carousels</h3>
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<p>Carousels require the use of an <code>id</code> on the outermost container (the <code>.carousel</code>) for carousel controls to function properly. When adding multiple carousels, or when changing a carousel's <code>id</code>, be sure to update the relevant controls.</p>
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<h3>Via data attributes</h3>
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<p>Use data attributes to easily control the position of the carousel. <code>data-slide</code> accepts the keywords <code>prev</code> or <code>next</code>, which alters the slide position relative to its current position. Alternatively, use <code>data-slide-to</code> to pass a raw slide index to the carousel <code>data-slide-to="2"</code>, which shifts the slide position to a particular index beginning with <code>0</code>.</p>
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<p>The <code>data-ride="carousel"</code> attribute is used to mark a carousel as animating starting at page load. <strong class="text-danger">It cannot be used in combination with (redundant and unnecessary) explicit JavaScript initialization of the same carousel.</strong></p>
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<h3>Via JavaScript</h3>
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<p>Call carousel manually with:</p>
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{% highlight js %}
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$('.carousel').carousel()
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{% endhighlight %}
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<h3>Options</h3>
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<p>Options can be passed via data attributes or JavaScript. For data attributes, append the option name to <code>data-</code>, as in <code>data-interval=""</code>.</p>
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<div class="table-responsive">
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<table class="table table-bordered table-striped">
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<thead>
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<tr>
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<th style="width: 100px;">Name</th>
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<th style="width: 50px;">type</th>
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<th style="width: 50px;">default</th>
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<th>description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>interval</td>
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<td>number</td>
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<td>5000</td>
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<td>The amount of time to delay between automatically cycling an item. If false, carousel will not automatically cycle.</td>
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</tr>
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<tr>
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<td>pause</td>
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<td>string</td>
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<td>"hover"</td>
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<td>Pauses the cycling of the carousel on mouseenter and resumes the cycling of the carousel on mouseleave.</td>
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</tr>
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<tr>
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<td>wrap</td>
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<td>boolean</td>
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<td>true</td>
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<td>Whether the carousel should cycle continuously or have hard stops.</td>
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</tr>
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</tbody>
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</table>
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</div><!-- /.table-responsive -->
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<h3>Methods</h3>
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<h4>.carousel(options)</h4>
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<p>Initializes the carousel with an optional options <code>object</code> and starts cycling through items.</p>
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{% highlight js %}
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$('.carousel').carousel({
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interval: 2000
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})
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{% endhighlight %}
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<h4>.carousel('cycle')</h4>
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<p>Cycles through the carousel items from left to right.</p>
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<h4>.carousel('pause')</h4>
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<p>Stops the carousel from cycling through items.</p>
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<h4>.carousel(number)</h4>
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<p>Cycles the carousel to a particular frame (0 based, similar to an array).</p>
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<h4>.carousel('prev')</h4>
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<p>Cycles to the previous item.</p>
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<h4>.carousel('next')</h4>
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<p>Cycles to the next item.</p>
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<h3>Events</h3>
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<p>Bootstrap's carousel class exposes two events for hooking into carousel functionality.</p>
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<p>Both events have the following additional properties:</p>
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<ul>
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<li><code>direction</code>: The direction in which the carousel is sliding (either <code>"left"</code> or <code>"right"</code>).</li>
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<li><code>relatedTarget</code>: The DOM element that is being slid into place as the active item.</li>
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</ul>
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<div class="table-responsive">
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<table class="table table-bordered table-striped">
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<thead>
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<tr>
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<th style="width: 150px;">Event Type</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>slide.bs.carousel</td>
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<td>This event fires immediately when the <code>slide</code> instance method is invoked.</td>
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</tr>
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<tr>
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<td>slid.bs.carousel</td>
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<td>This event is fired when the carousel has completed its slide transition.</td>
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</tr>
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</tbody>
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</table>
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</div><!-- /.table-responsive -->
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{% highlight js %}
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$('#myCarousel').on('slide.bs.carousel', function () {
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// do something…
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})
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{% endhighlight %}
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</div>
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