jquery - 下拉菜单没有右对齐

Question

我有一个下拉菜单按钮，只有在屏幕太小时才会显示。我需要将其右对齐，但 float:right; 不起作用。

http://jsfiddle.net/VZ9y8/

这是 CSS:

#cssmenu ul,
#cssmenu li,
#cssmenu span,
#cssmenu a {
  margin: 0;
  padding: 0;
  position: relative;

}
#cssmenu {
  height: 49px;
  border-radius: 5px 5px 0 0;
  -moz-border-radius: 5px 5px 0 0;
  -webkit-border-radius: 5px 5px 0 0;
  background: #fefefe;
  background: -moz-linear-gradient(top, #fefefe 0%, #eee9f0 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #fefefe), color-stop(100%, #eee9f0));
  background: -webkit-linear-gradient(top, #fefefe 0%, #eee9f0 100%);
  background: -o-linear-gradient(top, #fefefe 0%, #eee9f0 100%);
  background: -ms-linear-gradient(top, #fefefe 0%, #eee9f0 100%);
  background: linear-gradient(top, #fefefe 0%, #eee9f0 100%);
  border-bottom: 2px solid #ffffff;
  width: auto;
  display:block;
}
#cssmenu:after,
#cssmenu ul:after {
  content: '';
  display: block;
  clear: both;
}
#cssmenu a {
  background: #fefefe;
  background: -moz-linear-gradient(top, #fefefe 0%, #ececec 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #fefefe), color-stop(100%, #ececec));
  background: -webkit-linear-gradient(top, #fefefe 0%, #ececec 100%);
  background: -o-linear-gradient(top, #fefefe 0%, #ececec 100%);
  background: -ms-linear-gradient(top, #fefefe 0%, #ececec 100%);
  background: linear-gradient(top, #fefefe 0%, #ececec 100%);
  color: #000;
  display: inline-block;
  font-family: Helvetica, Arial, Verdana, sans-serif;
  font-size: 12px;
  line-height: 49px;
  padding: 0 20px;
  text-decoration: none;
}
#cssmenu ul {
  list-style: none;
}
#cssmenu > ul {
  float: left;
}
#cssmenu > ul > li {
  float: left;
}
#cssmenu > ul > li > a {
  color: #000000;
  font-size: 12px;
}
#cssmenu > ul > li:hover:after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  position: absolute;
  left: 50%;
  bottom: 0;
  /* Stile con freccia bassa  
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-bottom: 10px solid #ffffff;
  */
  margin-left: -10px;
}
#cssmenu > ul > li:first-child > a {
  border-radius: 5px 0 0 0;
  -moz-border-radius: 5px 0 0 0;
  -webkit-border-radius: 5px 0 0 0;
}
#cssmenu > ul > li.active:after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  position: absolute;
  left: 50%;
  bottom: 0;
  /* Stile con freccia bassa  
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-bottom: 10px solid #ffffff;
  */
  margin-left: -10px;
}
#cssmenu > ul > li.active > a {
  -moz-box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.1);
  -webkit-box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.1);
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.1);
  background: #ececec;
  background: -moz-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #ececec), color-stop(100%, #ffeeff ef));
  background: -webkit-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: -o-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: -ms-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
}
#cssmenu > ul > li:hover > a {
  background: #ececec;
  background: -moz-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #ececec), color-stop(100%, #ffeeff ef));
  background: -webkit-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: -o-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: -ms-linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  background: linear-gradient(top, #ececec 0%, #ffeeff ef 100%);
  -moz-box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.1);
  -webkit-box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.1);
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.1);
}
#cssmenu .has-sub {
  z-index: 2;




}
#cssmenu .has-sub:hover > ul {
  display: block;


}
#cssmenu .has-sub ul {
  display: none;
  position: absolute;
  width: 200px;
  top: 100%;
  left: 0;
}
#cssmenu .has-sub ul li {
  *margin-bottom: -1px;
}
#cssmenu .has-sub ul li a {
  background: #ffffff;
  border-bottom: 1px dotted #ffffff;
  filter: none;
  font-size: 11px;
  display: block;
  line-height: 120%;
  padding: 10px;
  color: #000000;
}
#cssmenu .has-sub ul li:hover a {
  background: #e6e6e6;
}
#cssmenu .has-sub .has-sub:hover > ul {
  display: block;
}
#cssmenu .has-sub .has-sub ul {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
}
#cssmenu .has-sub .has-sub ul li a {
  background: #e6e6e6;
  border-bottom: 1px dotted #ffffff;
}
#cssmenu .has-sub .has-sub ul li a:hover {
  background: #d9d9d9;
}

仅当我添加 right:-50px 时对齐才有效，但这不是一个安全的解决方案。

Answer 1

只需添加这两个属性:

.#cssmenu > ul {
    width:100%;
}

当您的 ul 是屏幕的 100% 时，float:right 起作用

#cssmenu .has-sub {
   float:right;
}

在此处查看您的代码 http://jsfiddle.net/VZ9y8/3/