面包屑项目的边框着色

分类：编程问答

如何解决面包屑项目的边框着色

我正在尝试创建一个类似

breadcrumb

的面包屑

到目前为止，我取得了一些不错的进展。但是我无法将这些边框颜色添加到<li>项目中。我怎样才能做到这一点 ？这是我到目前为止所做的。

#breadcrumbs{
    overflow: hidden;
    width: 100%;
    list-style: none;
    margin-bottom: 0px;
  }

  #breadcrumbs li{
    float: left;
    margin: 0 .3em 0 1em;
    font-size: 18px;
    font-weight: 400;
    letter-spacing: 1px;
  }

  #breadcrumbs a{
    background: #eef6f8;
    padding: .4em 1em;
    float: left;
    text-decoration: none;
    color: #000;
    text-shadow: 0 1px 0 rgba(255,255,.5);
    position: relative;
  }

  #breadcrumbs > li.active > a{
    background:#00305e;
    color: #fff;
  }

  #breadcrumbs a:hover{
    background: #99db76;
  }

  #breadcrumbs a::before{
    content: "";
    position: absolute;
    top: 50%;
    margin-top: -1.5em;
    border-width: 1.5em 0 1.5em 1em;
    border-style: solid;
    border-color: #eef6f8 #eef6f8 #eef6f8 transparent;
    left: -1em;
  }

  #breadcrumbs li:first-child  a::before{
border-color:#eef6f8;
  }
  #breadcrumbs li.active > a::after{
    border-left: 1em solid #00305e;
  }

  #breadcrumbs li.active:first-child  >  a::before{
    border-color:#00305e;
      }

  #breadcrumbs a:hover::before{
    border-color: #99db76 #99db76 #99db76 transparent;
  }

  #breadcrumbs a::after{
    content: "";
    position: absolute;
    top: 50%;
    margin-top: -1.5em;
    border-top: 1.5em solid transparent;
    border-bottom: 1.5em solid transparent;
    border-left: 1em solid #eef6f8;
    right: -1em;
  }

  

  #breadcrumbs a:hover::after{
    border-left-color: #99db76;
  }

  #breadcrumbs .current,#breadcrumbs .current:hover{
    font-weight: bold;
    background: none;
  }

  #breadcrumbs .current::after,#breadcrumbs .current::before{
    content: normal;
  }
<head>
<style>

</style>
</head>
<body style="background-color:wheat">
<div class="crumbs-menu">
  <ul id="breadcrumbs">
      <li class="active"><a href="">Medical</a></li>
          <li><a href="">Dental</a></li>
           <li><a href="">Vision</a></li>
            </ul>
  </div>
</body>

解决方法

一个简单的阴影过滤器就可以在这里完成工作而无需更改代码：

#breadcrumbs {
  overflow: hidden;
  list-style: none;
  margin-bottom: 0px;
}

#breadcrumbs li {
  float: left;
  margin: 0 .3em 0 1em;
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 1px;
}

#breadcrumbs a {
  background: #eef6f8;
  padding: .4em 1em;
  float: left;
  text-decoration: none;
  color: #000;
  text-shadow: 0 1px 0 rgba(255,255,.5);
  position: relative;
  filter:drop-shadow(2px 0px 0px red); /* added (2px of red border) */
}

#breadcrumbs>li.active>a {
  background: #00305e;
  color: #fff;
}

#breadcrumbs a:hover {
  background: #99db76;
}

#breadcrumbs a::before {
  content: "";
  position: absolute;
  top: 50%;
  margin-top: -1.5em;
  border-width: 1.5em 0 1.5em 1em;
  border-style: solid;
  border-color: #eef6f8 #eef6f8 #eef6f8 transparent;
  left: -1em;
}

#breadcrumbs li:first-child a::before {
  border-color: #eef6f8;
}

#breadcrumbs li.active>a::after {
  border-left: 1em solid #00305e;
}

#breadcrumbs li.active:first-child>a::before {
  border-color: #00305e;
}

#breadcrumbs a:hover::before {
  border-color: #99db76 #99db76 #99db76 transparent;
}

#breadcrumbs a::after {
  content: "";
  position: absolute;
  top: 50%;
  margin-top: -1.5em;
  border-top: 1.5em solid transparent;
  border-bottom: 1.5em solid transparent;
  border-left: 1em solid #eef6f8;
  right: -1em;
}

#breadcrumbs a:hover::after {
  border-left-color: #99db76;
}

#breadcrumbs .current,#breadcrumbs .current:hover {
  font-weight: bold;
  background: none;
}

#breadcrumbs .current::after,#breadcrumbs .current::before {
  content: normal;
}
<body style="background-color:wheat">
  <div class="crumbs-menu">
    <ul id="breadcrumbs">
      <li class="active"><a href="">Medical</a></li>
      <li><a href="">Dental</a></li>
      <li><a href="">Vision</a></li>
    </ul>
  </div>
</body>

,

如果可以为右箭头添加一个额外的* fixed effects regression,with interaction of continuous and factor variable xtreg ln_wage c.wks_ue##i.occ_code,fe * investigate marginal effects of weeks worked last year margins,dydx(wks_ue) at(occ_code = (1 2 3)) 元素。我会这样做。

span

使用<ul id="breadcrumbs"> <li class="active"> <a href="">Medical</a> <span class="right-arrow"></span> </li> <li> <a href="">Dental</a> <span class="right-arrow"></span> </li> <li> <a href="">Vision</a> <span class="right-arrow"></span> </li> </ul> ，我将为右箭头创建2种形状，并使用不同的颜色-一种形状将与面包屑的原色相匹配，另一种形状将用作边框效果。

在MDN docs上详细了解clip-path。或者，如果您是视觉学习者，请玩here。 

clip-path

#breadcrumbs li:not(.active) a:hover + .right-arrow {
    --primary-color: #99db76;
}

.active .right-arrow {
    --primary-color: #00305e;
    --secondary-color: green;
}

.right-arrow {
    --polygon: polygon(0 0,5px 0,100% 50%,5px 100%,0 100%);
    --primary-color: #eef6f8;
    --secondary-color: #00305e;

    position: absolute;
    top: 0;
    right: -1em;
    height: 100%;
    width: 1em;
}

.right-arrow::after {
    content: "";
    height: inherit;
    width: inherit;
    position: absolute;
    left: -3px;
    background-color: var(--primary-color);
    clip-path: var(--polygon);
}

.right-arrow::before {
    content: "";
    height: inherit;
    width: inherit;
    position: absolute;
    background-color: var(--secondary-color);
    clip-path: var(--polygon);
}

#breadcrumbs {
  position: relative;
  overflow: hidden;
  width: 100%;
  list-style: none;
  margin-bottom: 0px;
}

#breadcrumbs li {
  position: relative;
  float: left;
  margin: 0 0.3em 0 1em;
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 1px;
}

#breadcrumbs a {
  background: #eef6f8;
  padding: 0.4em 1em;
  float: left;
  text-decoration: none;
  color: #000;
  text-shadow: 0 1px 0 rgba(255,0.5);
  position: relative;
}

#breadcrumbs>li.active>a {
  background: #00305e;
  color: #fff;
}

#breadcrumbs a:hover {
  background: #99db76;
}

#breadcrumbs a::before {
  content: "";
  position: absolute;
  top: 50%;
  margin-top: -1.5em;
  border-width: 1.5em 0 1.5em 1em;
  border-style: solid;
  border-color: #eef6f8 #eef6f8 #eef6f8 transparent;
  left: -1em;
}

#breadcrumbs li:first-child a::before {
  border-color: #eef6f8;
}

#breadcrumbs li.active>a::after {
  border-left: 1em solid #00305e;
}

#breadcrumbs li.active:first-child>a::before {
  border-color: #00305e;
}

#breadcrumbs a:hover::before {
  border-color: #99db76 #99db76 #99db76 transparent;
}

#breadcrumbs li:not(.active) a:hover+.right-arrow {
  --primary-color: #99db76;
}

.active .right-arrow {
  --primary-color: #00305e;
  --secondary-color: green;
}

.right-arrow {
  --polygon: polygon(0 0,0 100%);
  --primary-color: #eef6f8;
  --secondary-color: #00305e;
  position: absolute;
  top: 0;
  right: -1em;
  height: 100%;
  width: 1em;
}

.right-arrow::after {
  content: "";
  height: inherit;
  width: inherit;
  position: absolute;
  left: -3px;
  background-color: var(--primary-color);
  clip-path: var(--polygon);
}

.right-arrow::before {
  content: "";
  height: inherit;
  width: inherit;
  position: absolute;
  background-color: var(--secondary-color);
  clip-path: var(--polygon);
}

#breadcrumbs a:hover::after {
  border-left-color: #99db76;
}

#breadcrumbs .current,#breadcrumbs .current::before {
  content: normal;
}

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