javascript - 在 slider 中居中 ResponsiveSlides 导航箭头？

Question

我的网站上有一个 ResponsiveSlides slider ，我试图让上一个/下一个导航箭头在 slider 的左右边缘垂直居中。

当我调整浏览器大小时，它们会四处移动，向右/下一个箭头似乎悬在 slider 外几个像素，并且在 480px 断点周围发生了一些奇怪的事情(一旦你比 480px 小一点点， slider 比下面的列宽一点；而且，箭头在屏幕下方更远的地方结束)。

直播可以看到here

js

<script src="js/responsiveslides.min.js"></script>
    <script>
        $(function() {
            $("#slider").responsiveSlides({
               auto: true,
               pager: false,
               nav: true,
            });
        });
    </script>

html

<div class="section group">
                <div class="col span_3_of_3">
                    <ul id="slider">
                        <li id="1"><img src="assets/slider/buzz-covers.jpg" alt="buzz covers"></li>
                        <li id="2"><img src="assets/slider/slab-happy.png" alt="slab happy"></li>
                        <li id="3"><img src="assets/slider/gridbook.jpg" alt="gridbook"></li>
                        <li id="4"><img src="assets/slider/ninth-spread.jpg" alt="ninth letter"></li>
                        <li id="5"><img src="assets/slider/slinkster.jpg" alt="slinkster"></li>
                        <li id="6"><img src="assets/slider/buzz-spread.jpg" alt="buzz spread"></li>
                    </ul>
                </div>
            </div>

css(不确定哪些位与我正在做的有关，所以这里是我的样式表中与 slider 相关的所有内容)

.rslides {
  position: relative;
  list-style: none;
  overflow: hidden;
  width: 100%;
  padding: 0;
  margin: 1.5em 0 0 0;
  background-color: #f7f7f7;
  }

.rslides li {
  -webkit-backface-visibility: hidden;
  position: absolute;
  display: none;
  width: 100%;
  left: 0;
  top: 0;
  }

.rslides li:first-child {
  position: relative;
  display: block;
  float: left;
  }

.rslides img {
  display: block;
  height: auto;
  float: left;
  width: 100%;
  border: 0;
  }

.rslides1_nav {
  position: absolute;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  top: 50%;
  left: 0;
  z-index: 99;
  opacity: 0.7;
  text-indent: -9999px;
  overflow: hidden;
  text-decoration: none;
  height: 61px;
  width: 38px;
  background: transparent url("themes.gif") no-repeat left top;
  margin-top: -45px;
  }

.rslides1_nav:active {
  opacity: 1.0;
  }

.rslides1_nav.next {
  left: auto;
  background-position: right top;
  right: 0;
  }

.rslides1_nav:focus {
  outline: none;
  }

.rslides_tabs {
  margin-top: 10px;
  text-align: center;
  }

.rslides_tabs li {
  display: inline;
  float: none;
  _float: left;
  *float: left;
  margin-right: 5px;
  }

.rslides_tabs a {
  text-indent: -9999px;
  overflow: hidden;
  -webkit-border-radius: 15px;
  -moz-border-radius: 15px;
  border-radius: 15px;
  background: #ccc;
  background: rgba(0,0,0, .2);
  display: inline-block;
  _display: block;
  *display: block;
  -webkit-box-shadow: inset 0 0 2px 0 rgba(0,0,0,.3);
  -moz-box-shadow: inset 0 0 2px 0 rgba(0,0,0,.3);
  box-shadow: inset 0 0 2px 0 rgba(0,0,0,.3);
  width: 9px;
  height: 9px;
  }

.rslides_tabs .rslides_here a {
  background: #222;
  background: rgba(0,0,0, .8);
  }

Answer 1

如 Varinder 所述，将 #slider 的父级 (.col.span_3_of_3) 和上一个/下一个链接设置为 relative 只能解决部分问题。

<div class="col span_3_of_3" style="position: relative;">
    <ul id="slider" class="rslides rslides1">
        <li id="rslides1_s0" class="" style="display: block; float: none; position: absolute; opacity: 0; z-index: 1; -webkit-transition: opacity 500ms ease-in-out; transition: opacity 500ms ease-in-out;">
            <img src="assets/slider/buzz-covers.jpg" alt="buzz covers">
        </li>
        <li id="rslides1_s1" style="float: left; position: relative; opacity: 1; z-index: 2; display: list-item; -webkit-transition: opacity 500ms ease-in-out; transition: opacity 500ms ease-in-out;" class="rslides1_on">
            <img src="assets/slider/slab-happy.png" alt="slab happy">
        </li>
        <li id="rslides1_s2" style="float: none; position: absolute; opacity: 0; z-index: 1; display: list-item; -webkit-transition: opacity 500ms ease-in-out; transition: opacity 500ms ease-in-out;" class="">
            <img src="assets/slider/gridbook.jpg" alt="gridbook">
        </li>
        <li id="rslides1_s3" style="float: none; position: absolute; opacity: 0; z-index: 1; display: list-item; -webkit-transition: opacity 500ms ease-in-out; transition: opacity 500ms ease-in-out;" class="">
            <img src="assets/slider/ninth-spread.jpg" alt="ninth letter">
        </li>
        <li id="rslides1_s4" style="float: none; position: absolute; opacity: 0; z-index: 1; display: list-item; -webkit-transition: opacity 500ms ease-in-out; transition: opacity 500ms ease-in-out;" class="">
            <img src="assets/slider/slinkster.jpg" alt="slinkster">
        </li>
        <li id="rslides1_s5" style="float: none; position: absolute; opacity: 0; z-index: 1; display: list-item; -webkit-transition: opacity 500ms ease-in-out; transition: opacity 500ms ease-in-out;" class="">
            <img src="assets/slider/buzz-spread.jpg" alt="buzz spread">
        </li>
    </ul>
    <a href="#" class="rslides_nav rslides1_nav prev">Previous</a><a href="#" class="rslides_nav rslides1_nav next">Next</a>
</div>

下一部分是将“.rslides_nav”上的 margin-top 设置为 -19.5px 以使幻灯片导航按钮完全垂直居中。

这个解决方案源于这样一个事实，即当浏览器宽度小于 420 像素时，您已经为那些使按钮仍然略微不对齐的链接预定义了 margin-top。

所以您的问题的解决方案是使用以下 CSS

.rslides_nav{
    margin-top:-19.5px !important;
}
.col.span_3_of_3{
    position:relative;
}

Demo