twitter-bootstrap - 如何让 Bootstrap 的导航下拉菜单平滑地上下滑动？

Question

我的导航是 Twitter 的常规 Bootstrap，除了我想要一些幻灯片效果。

如何使 Bootstrap 导航上的下拉菜单平滑地上下滑动？

Answer 1

好吧，这是通过根据我从http://twitter.github.com/bootstrap/assets/js/bootstrap-dropdown.js收集到的内容切换类名来完成的。

如果有的话，您必须正确手动编辑下拉 JS 以支持用于打开和关闭菜单的动画的自定义设置。这是非常可行的，我认为这样的事情会起作用：https ://gist.github.com/3013002

警告这尚未经过测试。

编辑：这将导致 Bootstrap 更多地依赖 jQuery.effects。只是一个抬头。

Answer 2

如果有人需要 - 检查我的解决方案。修改 bootstrap-dropdown.js 下面。我没有将 display:none 切换为 display:block，而是使用 slideToggle。为了让引导 CSS 不发生交互，我将打开的菜单项的类从“打开”更改为“打开”。

/* ============================================================
 * bootstrap-dropdown.js v2.3.0
 * http://twitter.github.com/bootstrap/javascript.html#dropdowns
 * ============================================================
 * 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 ;_;


 /* DROPDOWN CLASS DEFINITION
  * ========================= */

  var toggle = '[data-toggle=dropdown]'
    , Dropdown = function (element) {
        var $el = $(element).on('click.dropdown.data-api', this.toggle)
        $('html').on('click.dropdown.data-api', function () {
          $(toggle).next('ul').slideToggle();
          $el.parent().removeClass('opened')
        })
      }

  Dropdown.prototype = {

    constructor: Dropdown

  , toggle: function (e) {
      var $this = $(this)
        , $parent
        , isActive

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

      $parent = getParent($this)

      isActive = $parent.hasClass('opened')

      clearMenus()

      if (!isActive) {
        $(this).next('ul').slideToggle();
        $parent.toggleClass('opened')
      }

      $this.focus()

      return false
    }

  , keydown: function (e) {
      var $this
        , $items
        , $active
        , $parent
        , isActive
        , index

      if (!/(38|40|27)/.test(e.keyCode)) return

      $this = $(this)

      e.preventDefault()
      e.stopPropagation()

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

      $parent = getParent($this)

      isActive = $parent.hasClass('opened')

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

      $items = $('[role=menu] li:not(.divider):visible a', $parent)

      if (!$items.length) return

      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()
    }

  }

  function clearMenus() {
    $(toggle).each(function () {
      if (getParent($(this)).hasClass('opened')) {
        $(this).next('ul').slideToggle();
        getParent($(this)).removeClass('opened');
      }
    })
  }

  function getParent($this) {
    var selector = $this.attr('data-target')
      , $parent

    if (!selector) {
      selector = $this.attr('href')
      selector = selector && /#/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') //strip for ie7
    }

    $parent = selector && $(selector)

    if (!$parent || !$parent.length) $parent = $this.parent()

    return $parent
  }


  /* DROPDOWN PLUGIN DEFINITION
   * ========================== */

  var old = $.fn.dropdown

  $.fn.dropdown = function (option) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('dropdown')
      if (!data) $this.data('dropdown', (data = new Dropdown(this)))
      if (typeof option == 'string') data[option].call($this)
    })
  }

  $.fn.dropdown.Constructor = Dropdown


 /* DROPDOWN NO CONFLICT
  * ==================== */

  $.fn.dropdown.noConflict = function () {
    $.fn.dropdown = old
    return this
  }


  /* APPLY TO STANDARD DROPDOWN ELEMENTS
   * =================================== */

  $(document)
    .on('click.dropdown.data-api', clearMenus)
    .on('click.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })
    .on('.dropdown-menu', function (e) { e.stopPropagation() })
    .on('click.dropdown.data-api'  , toggle, Dropdown.prototype.toggle)
    .on('keydown.dropdown.data-api', toggle + ', [role=menu]' , Dropdown.prototype.keydown)

}(window.jQuery); 

Answer 3

我还没有检查这是否适用于旧版本的 Bootstrap，但是使用 v3，您可以绑定到单击下拉切换时触发的事件。这样您就不必编辑源 JS 代码。

$(document).on("hide.bs.dropdown", ".dropdown", function (event) {
    $(event.target).find(">.dropdown-menu:first").slideUp();
});

$(document).on("show.bs.dropdown", ".dropdown", function (event) {
    $(event.target).find(">.dropdown-menu:first").slideDown();
});