a.rb

/* =========================================================
 * bootstrap-modal.js v2.0.0
 * http://twitter.github.com/bootstrap/javascript.html#modals
 * =========================================================
 * 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.
 * ========================================================= */

/* Borrowed from jquery ui
 * ======================= */

function focusable( element, isTabIndexNotNaN ) {
  var nodeName = element.nodeName.toLowerCase();
  if ( "area" === nodeName ) {
    var map = element.parentNode,
      mapName = map.name,
      img;
    if ( !element.href || !mapName || map.nodeName.toLowerCase() !== "map" ) {
      return false;
    }
    img = $( "img[usemap=#" + mapName + "]" )[0];
    return !!img && visible( img );
  }
  return ( /input|select|textarea|button|object/.test( nodeName )
    ? !element.disabled
    : "a" == nodeName
      ? element.href || isTabIndexNotNaN
      : isTabIndexNotNaN)
    // the element and all of its ancestors must be visible
    && visible( element );
}

function visible( element ) {
  return !$( element ).parents().andSelf().filter(function() {
    return $.curCSS( this, "visibility" ) === "hidden" ||
      $.expr.filters.hidden( this );
  }).length;
}

$.fn.extend({
  _focus: $.fn.focus,
  focus: function( delay, fn ) {
    return typeof delay === "number" ?
      this.each(function() {
        var elem = this;
        setTimeout(function() {
          $( elem ).focus();
          if ( fn ) {
            fn.call( elem );
          }
        }, delay );
      }) :
      this._focus.apply( this, arguments );
  }
});

$.extend( $.expr[ ":" ], {
  data: function( elem, i, match ) {
    return !!$.data( elem, match[ 3 ] );
  },

  focusable: function( element ) {
    return focusable( element, !isNaN( $.attr( element, "tabindex" ) ) );
  },

  tabbable: function( element ) {
    var tabIndex = $.attr( element, "tabindex" ),
      isTabIndexNaN = isNaN( tabIndex );
    return ( isTabIndexNaN || tabIndex >= 0 ) && focusable( element, !isTabIndexNaN );
  }
});


!function( $ ){

  "use strict"

 /* MODAL CLASS DEFINITION
  * ====================== */

  var Modal = function ( content, options ) {
    this.options = $.extend({}, $.fn.modal.defaults, options)
    this.$element = $(content)
      .delegate('[data-dismiss="modal"]', 'click.dismiss.modal', $.proxy(this.hide, this))
  }

  Modal.prototype = {

      constructor: Modal

    , toggle: function () {
        return this[!this.isShown ? 'show' : 'hide']()
      }

    , show: function () {
        var that = this

        if (this.isShown) return

        $('body').addClass('modal-open')

        this.isShown = true
        this.$element.trigger('show')

        escape.call(this)
        backdrop.call(this, function () {
          var transition = $.support.transition && that.$element.hasClass('fade')

          !that.$element.parent().length && that.$element.appendTo(document.body) //don't move modals dom position

          that.$element
            .show()

          if (transition) {
            that.$element[0].offsetWidth // force reflow
          }

          that.$element.addClass('in')

          transition ?
            that.$element.one($.support.transition.end, function () { that.$element.trigger('shown'); setFocus.call(that) }) :
            that.$element.trigger('shown')
            setFocus.call(that)
        })

        // prevent tabbing out of the modal
        this.$element.bind( "keydown", function( event ) {
          if ( event.keyCode !== 9 ) {
            return;
          }

          var tabbables = $( ":tabbable", this ),
            first = tabbables.filter( ":first" ),
            last  = tabbables.filter( ":last" );

          if ( event.target === last[0] && !event.shiftKey ) {
            first.focus( 1 );
            return false;
          } else if ( event.target === first[0] && event.shiftKey ) {
            last.focus( 1 );
            return false;
          }
        });
      }
    , hide: function ( e ) {
        e && e.preventDefault()

        if (!this.isShown) return

        var that = this
        this.isShown = false

        $('body').removeClass('modal-open')

        escape.call(this)

        this.$element
          .trigger('hide')
          .removeClass('in')

        $.support.transition && this.$element.hasClass('fade') ?
          hideWithTransition.call(this) :
          hideModal.call(this)
      }

  }


 /* MODAL PRIVATE METHODS
  * ===================== */

  function setFocus() {
    // set focus to the first form input field...
    var focal = this.$element.find( "input,select,textarea,button,object" );

    // ...or to the first link that does not look like a close button
    if ( !focal.length ) {
      focal = this.$element.find( "a:not([data-toggle=modal])" );

      // ...or heck, to the modal div itself
      if ( !focal.length ) {
        focal = this.$element;
      }
    }
    focal.eq( 0 ).focus();
  }

  function hideWithTransition() {
    var that = this
      , timeout = setTimeout(function () {
          that.$element.off($.support.transition.end)
          hideModal.call(that)
        }, 500)

    this.$element.one($.support.transition.end, function () {
      clearTimeout(timeout)
      hideModal.call(that)
    })
  }

  function hideModal( that ) {
    this.$element
      .hide()
      .trigger('hidden')

    backdrop.call(this)
  }

  function backdrop( callback ) {
    var that = this
      , animate = this.$element.hasClass('fade') ? 'fade' : ''

    if (this.isShown && this.options.backdrop) {
      var doAnimate = $.support.transition && animate

      this.$backdrop = $('<div class="modal-backdrop ' + animate + '" />')
        .appendTo(document.body)

      if (this.options.backdrop != 'static') {
        this.$backdrop.click($.proxy(this.hide, this))
      }

      if (doAnimate) this.$backdrop[0].offsetWidth // force reflow

      this.$backdrop.addClass('in')

      doAnimate ?
        this.$backdrop.one($.support.transition.end, callback) :
        callback()

    } else if (!this.isShown && this.$backdrop) {
      this.$backdrop.removeClass('in')

      $.support.transition && this.$element.hasClass('fade')?
        this.$backdrop.one($.support.transition.end, $.proxy(removeBackdrop, this)) :
        removeBackdrop.call(this)

    } else if (callback) {
      callback()
    }
  }

  function removeBackdrop() {
    this.$backdrop.remove()
    this.$backdrop = null
  }

  function escape() {
    var that = this
    if (this.isShown && this.options.keyboard) {
      $(document).on('keyup.dismiss.modal', function ( e ) {
        e.which == 27 && that.hide()
      })
    } else if (!this.isShown) {
      $(document).off('keyup.dismiss.modal')
    }
  }


 /* MODAL PLUGIN DEFINITION
  * ======================= */

  $.fn.modal = function ( option ) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('modal')
        , options = typeof option == 'object' && option
      if (!data) $this.data('modal', (data = new Modal(this, options)))
      if (typeof option == 'string') data[option]()
      else data.show()
    })
  }

  $.fn.modal.defaults = {
      backdrop: true
    , keyboard: true
  }

  $.fn.modal.Constructor = Modal


 /* MODAL DATA-API
  * ============== */

  $(function () {
    $('body').on('click.modal.data-api', '[data-toggle="modal"]', function ( e ) {
      var $this = $(this), href
        , $target = $($this.attr('data-target') || (href = $this.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
        , option = $target.data('modal') ? 'toggle' : $.extend({}, $target.data(), $this.data())

      e.preventDefault()
      $target.modal(option)
    })
  })

}( window.jQuery )