Dropdown.prototype.keydown = function()

in templates/ydotm/bootstrap3.js [684:714]

• 21 lines of code
• 13 McCabe index (conditional complexity)

  Dropdown.prototype.keydown = function (e) {
    if (!/(38|40|27)/.test(e.keyCode)) return

    var $this = $(this)

    e.preventDefault()
    e.stopPropagation()

    if ($this.is('.disabled, :disabled')) return

    var $parent  = getParent($this)
    var isActive = $parent.hasClass('open')

    if (!isActive || (isActive && e.keyCode == 27)) {
      if (e.which == 27) $parent.find(toggle).focus()
      return $this.click()
    }

    var desc = ' li:not(.divider):visible a'
    var $items = $parent.find('[role=menu]' + desc + ', [role=listbox]' + desc)

    if (!$items.length) return

    var index = $items.index($items.filter(':focus'))

    if (e.keyCode == 38 && index > 0)                 index--                        // up
    if (e.keyCode == 40 && index < $items.length - 1) index++                        // down
    if (!~index)                                      index = 0

    $items.eq(index).focus()
  }