下拉式按钮

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/rhx_1989/article/details/89027036

1.css

.ren-btn-group {
	position: relative;
	display: inline-block;
    vertical-align: middle;
    white-space: nowrap;
	font-size:0;
}
.ren-btn-group > .btn:first-child {
    margin-left: 0;
    -webkit-border-radius: 2px 0 0 2px;
    -moz-border-radius: 2px 0 0 2px;
    border-radius: 2px 0 0 2px;
}
.ren-btn-group .btn {
    position: relative;
    font-size: 12px;
	display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    color: #333333;
    text-shadow: 0 1px 1px rgba(255, 255, 255, 0.75);
    background-color: #e6e6e6;
    background-image: -webkit-gradient(linear, left top, left bottom, from(white), to(#e6e6e6));
    background-image: -webkit-linear-gradient(top, white, #e6e6e6);
    background-image: -moz-linear-gradient(top, white, #e6e6e6);
    background-image: -ms-linear-gradient(top, white, #e6e6e6);
    background-image: -o-linear-gradient(top, white, #e6e6e6);
    background-image: linear-gradient(top, white, #e6e6e6);
    background-repeat: repeat-x;
    border-color: #e6e6e6 #e6e6e6 #bfbfbf;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    border: 1px solid #bbbbbb;
    border-bottom-color: #a2a2a2;
    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    border-radius: 2px;
    -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2) 0 1px 2px rgba(0, 0, 0, 0.05);
    -moz-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2) 0 1px 2px rgba(0, 0, 0, 0.05);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2) 0 1px 2px rgba(0, 0, 0, 0.05);
}
.ren-btn-group > .btn + .btn {
    margin-left: -1px;
}
.ren-btn-group > .dropdown-toggle {
    -webkit-border-radius: 0 2px 2px 0;
    -moz-border-radius: 0 2px 2px 0;
    border-radius: 0 2px 2px 0;
}
.ren-btn-group .btn-primary {
    color: white;
    text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
    background-color: #2877aa;
    background-image: -webkit-gradient(linear, left top, left bottom, from(#3693cf), to(#2877aa));
    background-image: -webkit-linear-gradient(top, #3693cf, #2877aa);
    background-image: -moz-linear-gradient(top, #3693cf, #2877aa);
    background-image: -ms-linear-gradient(top, #3693cf, #2877aa);
    background-image: -o-linear-gradient(top, #3693cf, #2877aa);
    background-image: linear-gradient(top, #3693cf, #2877aa);
    background-repeat: repeat-x;
    border-color: #3693cf #3693cf #2877aa;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
}
.ren-btn-group .caret {
	margin-top: 8px;
    margin-left: 0;
    display: inline-block;
    width: 0;
    height: 0;
    vertical-align: top;
    border-top: 4px solid black;
    border-right: 4px solid transparent;
    border-left: 4px solid transparent;
    content: "";
}
.ren-btn-group .dropdown-menu {
    position: absolute;
    top: 100%;
    z-index: 1000;
    display: none;
    float: left;
    min-width: 100px;
    padding: 0;
    margin: 2px 0 0;
    list-style: none;
    background-color: #ffffff;
    border: 1px solid #cccccc;
    border: 1px solid rgba(0, 0, 0, 0.2);
    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    border-radius: 2px;
    -moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
    -webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
    -webkit-box-sizing: padding-box;
    -moz-box-sizing: padding-box;
    box-sizing: padding-box;
}
.ren-btn-group .pull-right {
	right: 0;
	float: right!important;
}
 
.ren-btn-group .dropdown-menu li > a {
    -webkit-transition: none;
    -moz-transition: none;
    -o-transition: none;
    transition: none;	
    display: block;
    border-bottom: 1px solid #e6e6e6;
    padding: 5px 10px;
    clear: both;
    font-weight: normal;
    line-height: 20px;
    color: #333333;
    white-space: nowrap;
}
.ren-btn-group .dropdown-menu li > a:hover{background-color:#eaeaea;}
.ren-btn-group > .dropdown-menu, .btn-group > .popover {
    font-size: 14px;
}
.ren-btn-group .dropdown-menu a {
    color: #337ab7;
    text-decoration: none;
}
.open > .dropdown-menu {
    display: block;
}

2.js

!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 () {
          $el.parent().removeClass('open')
        })
      }

  Dropdown.prototype = {

    constructor: Dropdown

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

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

      $parent = getParent($this)

      isActive = $parent.hasClass('open')

      clearMenus()

      if (!isActive) {
        $parent.toggleClass('open')
      }

      $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('open')

      if (!isActive || (isActive && e.keyCode == 27)) 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() {
    $(toggle).each(function () {
      getParent($(this)).removeClass('open')
    })
  }

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

}(window.jQuery);

3.html

    <div class="ren-btn-group">
		<button class="btn btn-primary">
          查看详情
        </button>
        <button data-toggle="dropdown" class="btn btn-primary dropdown-toggle">
          <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
			<li>
				<a href="#">修改</a>
			</li>
			<li>
				<a href="#">删除</a>
			</li>
        </ul>
    </div>
	<div class="ren-btn-group">
        <button class="btn btn-primary">
          查看详情
        </button>
        <button data-toggle="dropdown" class="btn btn-primary dropdown-toggle">
          <span class="caret"></span>
        </button>
        <ul class="dropdown-menu pull-right">
			<li>
				<a href="#">修改</a>
			</li>
			<li>
				<a href="#">删除</a>
			</li>
        </ul>
    </div>

  
	<div class="ren-btn-group">
		<button type="button" class="btn btn-default dropdown-toggle" 
			data-toggle="dropdown">
		默认 <span class="caret"></span>
		</button>
		<ul class="dropdown-menu" role="menu">
		<li><a href="#">功能</a></li>
		<li><a href="#">另一个功能</a></li>
		<li><a href="#">其他</a></li>
		</ul>
	</div>