title: modify collapse plugin to work with select = selected
body: <p>I am trying to use a <code>&lt;select&gt;</code> so that on change it hide/shows a div. </p>
  
  <p>I want to make use of the twitter bootstrap collapse plugin. </p>
  
  <p>I have it half working with this example <a href="http://plnkr.co/edit/9lPe61?p=preview" rel="nofollow">http://plnkr.co/edit/9lPe61?p=preview</a></p>
  
  <p>But when you add <code>selected</code> to the select it breaks everything: <a href="http://plnkr.co/edit/w9XW8R?p=preview" rel="nofollow">http://plnkr.co/edit/w9XW8R?p=preview</a></p>
  
  <pre><code>&lt;div class="accordion" id="accordion" &gt;
      &lt;div class="accordion-group"&gt;
        &lt;select class="accordion-toggle"&gt;
           &lt;option value="1" data-toggle="collapse" data-parent="#accordion" data-target="#collapseOne"&gt;1&lt;/option&gt;
           &lt;option value="2" data-toggle="collapse" data-parent="#accordion" data-target="#collapseTwo"&gt;2&lt;/option&gt;
           &lt;option value="3" data-toggle="collapse" data-parent="#accordion" data-target="#collapseThree"&gt;3&lt;/option&gt;
        &lt;/select&gt;
  
        &lt;div id="collapseOne" class=" collapse in"&gt;
          &lt;div class="accordion-inner"&gt;
            Anim1 pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
          &lt;/div&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="accordion-group"&gt;
        &lt;div id="collapseTwo" class=" collapse"&gt;
          &lt;div class="accordion-inner"&gt;
            Anim2 pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
          &lt;/div&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="accordion-group"&gt;
        &lt;div id="collapseThree" class=" collapse"&gt;
          &lt;div class="accordion-inner"&gt;
            Anim3 pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
          &lt;/div&gt;
        &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>JS - I guess I would need to add to the plugin to check if there is a <code>selected="selected"</code> so that it works with selects also, but I cant figure out where abouts this needs to go?</p>
  
  <pre><code>/* =============================================================
   * bootstrap-collapse.js v2.3.1
   * http://twitter.github.com/bootstrap/javascript.html#collapse
   * =============================================================
   * Copyright 2012 Twitter, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * ============================================================ */
  
  
  !function ($) {
  
    "use strict"; // jshint ;_;
  
  
   /* COLLAPSE PUBLIC CLASS DEFINITION
    * ================================ */
  
    var Collapse = function (element, options) {
      this.$element = $(element)
      this.options = $.extend({}, $.fn.collapse.defaults, options)
  
      if (this.options.parent) {
        this.$parent = $(this.options.parent)
      }
  
      this.options.toggle &amp;&amp; this.toggle()
    }
  
    Collapse.prototype = {
  
      constructor: Collapse
  
    , dimension: function () {
        var hasWidth = this.$element.hasClass('width')
        return hasWidth ? 'width' : 'height'
      }
  
    , show: function () {
        var dimension
          , scroll
          , actives
          , hasData
  
        if (this.transitioning || this.$element.hasClass('in')) return
  
        dimension = this.dimension()
        scroll = $.camelCase(['scroll', dimension].join('-'))
        actives = this.$parent &amp;&amp; this.$parent.find('&gt; .accordion-group &gt; .in')
  
        if (actives &amp;&amp; actives.length) {
          hasData = actives.data('collapse')
          if (hasData &amp;&amp; hasData.transitioning) return
          actives.collapse('hide')
          hasData || actives.data('collapse', null)
        }
  
        this.$element[dimension](0)
        this.transition('addClass', $.Event('show'), 'shown')
        $.support.transition &amp;&amp; this.$element[dimension](this.$element[0][scroll])
      }
  
    , hide: function () {
        var dimension
        if (this.transitioning || !this.$element.hasClass('in')) return
        dimension = this.dimension()
        this.reset(this.$element[dimension]())
        this.transition('removeClass', $.Event('hide'), 'hidden')
        this.$element[dimension](0)
      }
  
    , reset: function (size) {
        var dimension = this.dimension()
  
        this.$element
          .removeClass('collapse')
          [dimension](size || 'auto')
          [0].offsetWidth
  
        this.$element[size !== null ? 'addClass' : 'removeClass']('collapse')
  
        return this
      }
  
    , transition: function (method, startEvent, completeEvent) {
        var that = this
          , complete = function () {
              if (startEvent.type == 'show') that.reset()
              that.transitioning = 0
              that.$element.trigger(completeEvent)
            }
  
        this.$element.trigger(startEvent)
  
        if (startEvent.isDefaultPrevented()) return
  
        this.transitioning = 1
  
        this.$element[method]('in')
  
        $.support.transition &amp;&amp; this.$element.hasClass('collapse') ?
          this.$element.one($.support.transition.end, complete) :
          complete()
      }
  
    , toggle: function () {
        this[this.$element.hasClass('in') ? 'hide' : 'show']()
      }
  
    }
  
  
   /* COLLAPSE PLUGIN DEFINITION
    * ========================== */
  
    var old = $.fn.collapse
  
    $.fn.collapse = function (option) {
      return this.each(function () {
        var $this = $(this)
          , data = $this.data('collapse')
          , options = $.extend({}, $.fn.collapse.defaults, $this.data(), typeof option == 'object' &amp;&amp; option)
        if (!data) $this.data('collapse', (data = new Collapse(this, options)))
        if (typeof option == 'string') data[option]()
      })
    }
  
    $.fn.collapse.defaults = {
      toggle: true
    }
  
    $.fn.collapse.Constructor = Collapse
  
  
   /* COLLAPSE NO CONFLICT
    * ==================== */
  
    $.fn.collapse.noConflict = function () {
      $.fn.collapse = old
      return this
    }
  
  
   /* COLLAPSE DATA-API
    * ================= */
  
    $(document).on('click.collapse.data-api', '[data-toggle=collapse]', function (e) {
      var $this = $(this), href
        , target = $this.attr('data-target')
          || e.preventDefault()
          || (href = $this.attr('href')) &amp;&amp; href.replace(/.*(?=#[^\s]+$)/, '') //strip for ie7
        , option = $(target).data('collapse') ? 'toggle' : $this.data()
      $this[$(target).hasClass('in') ? 'addClass' : 'removeClass']('collapsed')
      $(target).collapse(option)
    })
  
  }(window.jQuery);
  </code></pre>
  
  <p><a href="http://plnkr.co/edit/w9XW8R?p=preview" rel="nofollow">http://plnkr.co/edit/w9XW8R?p=preview</a></p>