Bootstrap 3下拉菜单中心对齐不工作 [英] Bootstrap 3 dropdown menu center align not working

问题描述

我无法将下拉列表对齐到使用悬停打开下拉菜单的父级的中心。我试图text-align：中心为整个.nav .navbar li元素，它不工作。我试图设置边距和左：50％的整个ul.dropdown菜单是下拉菜单，它不工作。这是html代码：

I am not able to align the dropdown to the center of the parent on which the dropdown is opened with hover. I have tried to text-align: center for the entire .nav .navbar li elements, and it doesn't work. I have tried to set margin and left: 50% for the entire ul.dropdown-menu that is the dropdown and it doesn't work. Here is the html code:

<ul class="nav navbar-nav navbar-right" id="headerDropdowns">
                        <li><div class="btn-toolbar">
                            <div class="btn-group">
                                <button class="btnCustom" data-toggle="dropdown" data-hover="dropdown" data-delay="1000">Our Difference</button>
                                <ul class="dropdown-menu">
                                    <li><a tabindex="-1" href="#">Made in the USA</a></li>
                                    <li class="divider"></li>
                                    <li><a tabindex="-1" href="#">Human Grade</a></li>
                                    <li class="divider"></li>
                                    <li><a tabindex="-1" href="#">Ingredients Fresh</a></li>
                                    <li class="divider"></li>
                                    <li><a tabindex="-1" href="#">USDA Meats</a></li>
                                    <li class="divider"></li>
                                    <li><a tabindex="-1" href="#">Our Story</a></li>
                                    <li class="divider"></li>
                                    <li><a tabindex="-1" href="#">Campare</a></li>
                                </ul>
                            </div>
                        </li>
</ul>

在类下拉菜单或nav navbar-nav中，应该设置吗？

In which class dropdown-menu, or nav navbar-nav, should I do the aligment, and what should I set?

推荐答案

您可以使用transform避免使用固定宽度：

You can use transform to avoid having to use fixed widths:

.dropdown-menu {
  left: 50%;
  right: auto;
  text-align: center;
  transform: translate(-50%, 0);
}

受 http://css-tricks.com/centering-percentage-widthheight-elements/

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