如何使用标签使 drop-down 箭头可点击

Question

我创建了一个垂直导航手风琴菜单，您可以在其中悬停并单击任何标题（标签）以打开 sub-menu。

出于某种原因，我的 drop-down 箭头不可点击，但标签的其余部分可点击并且功能正常。

如何使我的 "arrow" 可点击并像标签的其余部分一样发挥作用？

CSS:

/*Global*/

html,
body {
  width: 100%;
  margin: 0;
  padding: 0;
  font-family: helvetica;
}

/*Functionalty*/

.multi-level,
.item ul,
.nav input[type="checkbox"] {
  display: none;
}

#menu:checked~.multi-level,
.item input:checked~ul {
  display: block;
}

/*Arrow*/

.arrow {
  width: 10px;
  height: 10px;
  vertical-align: middle;
  float: left;
  margin: 9px 0.5em 0 2em;
}

.item input+.arrow {
  transform: rotate(-90deg);
  transition: 0.1s;
}

.item input:checked+.arrow {
  transform: rotate(0deg);
  transition: 0.1s;
}

img {
  z-index: 1;
  position: relative;
}

/*Styles*/

label:hover {
  cursor: pointer;
  background-color: #f2f2f2;
  position: relative;
}

li:hover {
  background-color: #f2f2f2;
}

label {
  width: 100%;
  display: block;
}

.nav {
  width: 100%;
  background-color: white;
  overflow-x: hidden;
  /*border-bottom: 1px solid #CFD8DC;*/
}

/*#nav-icon {
    font-size: 28px;
    line-height: 50px;
    padding-left: 1em;
    color: white;
    background-color: #F44336;
}*/

.nav ul,
.nav li,
label {
  line-height: 30px;
  margin: 0;
  padding: 0 2em;
  list-style: none;
  text-decoration: none;
  color: #000;
  font-weight: 100;
  width: 100%;
}

.item ul {
  padding: 0 0.25em;
}

.nav li a {
  line-height: 30px;
  margin: 0;
  padding: 0 2em;
  list-style: none;
  text-decoration: none;
  color: #000;
  font-weight: 100;
}

.item {
  margin: 0 0 0 -1.5em;
}

.sub-item {
  padding: 0 0m;
}

HTML:

<div class="nav">
  <input type="checkbox" id="menu" checked />
  <label for="menu"></label>

  <div class="multi-level">
    <div class="item">
      <input type="checkbox" id="A" />
      <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="A">Category One</label>
      <ul>
        <li><a href="#">Sub-Category One</a></li>
        <li><a href="#">Sub-Category Two</a></li>
        <li><a href="#">Sub-Category Three</a></li>
      </ul>
    </div>
    <div class="item">
      <input type="checkbox" id="B" />
      <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="B">Category Two</label>
      <ul>
        <li><a href="#">Sub-Category One</a></li>
        <li>
          <div class="sub-item">
            <input type="checkbox" id="B-A" />
            <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="B-A">Sub-Category Two</label>

            <ul>
              <li><a href="#">Sub-Sub-Category-1</a></li>
              <li><a href="#">Sub-Sub-Category-2</a></li>
              <li><a href="#">Sub-Sub-Category-3</a></li>
              <li><a href="#">Sub-Sub-Category-4</a></li>
              <li><a href="#">Sub-Sub-Category-5</a></li>
              <li><a href="#">Sub-Sub-Category-6</a></li>
            </ul>
          </div>
        </li>
      </ul>
    </div>
    <div class="item">
      <input type="checkbox" id="C" />
      <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="C">Category Three</label>
      <ul>
        <li><a href="#">Sub-Category One</a></li>
        <li><a href="#">Sub-Category Two</a></li>
        <li><a href="#">Sub-Category Three</a></li>
      </ul>
    </div>
    <div class="item">
      <input type="checkbox" id="D" />
      <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="D">Category Four</label>
      <ul>
        <li><a href="#">Sub-Category One</a></li>
        <li><a href="#">Sub-Category Two</a></li>
        <li><a href="#">Sub-Category Three</a></li>
      </ul>
    </div>

  </div>

</div>

Answer 1

您可以使用 :before 替换 img 标签，以确保我们点击 label 而不是 img

/*Global*/

html,
body {
  width: 100%;
  margin: 0;
  padding: 0;
  font-family: helvetica;
}

/*Functionalty*/

.multi-level,
.item ul,
.nav input[type="checkbox"] {
  display: none;
}

#menu:checked~.multi-level,
.item input:checked~ul {
  display: block;
}

/*Arrow*/

.arrow {
  width: 10px;
  height: 10px;
  vertical-align: middle;
  float: left;
  margin: 9px 0.5em 0 2em;
}

/*Styles*/

label:hover {
  cursor: pointer;
  background-color: #f2f2f2;
  position: relative;
}

li:hover {
  background-color: #f2f2f2;
}

label {
  width: 100%;
  display: block;
  position: relative;
}

.nav {
  width: 100%;
  background-color: white;
  overflow-x: hidden;
  /*border-bottom: 1px solid #CFD8DC;*/
}

/*#nav-icon {
    font-size: 28px;
    line-height: 50px;
    padding-left: 1em;
    color: white;
    background-color: #F44336;
}*/

.nav ul,
.nav li,
label {
  line-height: 30px;
  margin: 0;
  padding: 0 2em;
  list-style: none;
  text-decoration: none;
  color: #000;
  font-weight: 100;
  width: 100%;
}

.item ul {
  padding: 0 0.25em;
}

.nav li a {
  line-height: 30px;
  margin: 0;
  padding: 0 2em;
  list-style: none;
  text-decoration: none;
  color: #000;
  font-weight: 100;
}

.item {
  margin: 0 0 0 -1.5em;
}

.item {
  
  margin-left: 0;
}
.item label:before {
  content: '';
  background: url(https://png.icons8.com/material/50/000000/expand-arrow.png);
  width: 10px;
  background-size: 100%;
  height: 10px;
  position: absolute;
  top: 9px;
  left: 13px;
  transform: rotate(-90deg);
}

.item input:checked +label:before {
  transform: rotate(0);
}

.sub-item {
  padding: 0 0m;
}

<div class="nav">
 <input type="checkbox" id="menu" checked />
 <label for="menu"></label>
  
 <div class="multi-level">
   <div class="item">
  <input type="checkbox" id="A" />
  <label for="A">Category One</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li><a href="#">Sub-Category Two</a></li>
    <li><a href="#">Sub-Category Three</a></li>
  </ul>
   </div>
   <div class="item">
  <input type="checkbox" id="B" />
  <label for="B">Category Two</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li>
   <div class="sub-item">
     <input type="checkbox" id="B-A" />
     <label for="B-A">Sub-Category Two</label>
  
     <ul>
    <li><a href="#">Sub-Sub-Category-1</a></li>
    <li><a href="#">Sub-Sub-Category-2</a></li>
    <li><a href="#">Sub-Sub-Category-3</a></li>
    <li><a href="#">Sub-Sub-Category-4</a></li>
    <li><a href="#">Sub-Sub-Category-5</a></li>
    <li><a href="#">Sub-Sub-Category-6</a></li>
     </ul>
   </div>
    </li>
  </ul>
   </div>
   <div class="item">
  <input type="checkbox" id="C" />
  <label for="C">Category Three</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li><a href="#">Sub-Category Two</a></li>
    <li><a href="#">Sub-Category Three</a></li>
  </ul>
   </div>
   <div class="item">
  <input type="checkbox" id="D" />
  <label for="D">Category Four</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li><a href="#">Sub-Category Two</a></li>
    <li><a href="#">Sub-Category Three</a></li>
  </ul>
   </div>
  
 </div>
  
  </div>

https://jsfiddle.net/4v843n7f/34/

Answer 2

我可能会建议在标签元素上使用 :before 选择器（而不是在每个标签前插入 img）。这样可以解决箭头不可点击的问题，会使HTML更干

    <div class="nav">
 <input type="checkbox" id="menu" checked />
 <label for="menu"></label>

 <div class="multi-level">
   <div class="item">
  <input type="checkbox" id="A" />
  <label for="A">Category One</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li><a href="#">Sub-Category Two</a></li>
    <li><a href="#">Sub-Category Three</a></li>
  </ul>
</div>
<div class="item">
  <input type="checkbox" id="B" />
  <label for="B">Category Two</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li>
      <div class="sub-item">
        <input type="checkbox" id="B-A" />
        <label for="B-A">Sub-Category Two</label>

        <ul>
          <li><a href="#">Sub-Sub-Category-1</a></li>
          <li><a href="#">Sub-Sub-Category-2</a></li>
          <li><a href="#">Sub-Sub-Category-3</a></li>
          <li><a href="#">Sub-Sub-Category-4</a></li>
          <li><a href="#">Sub-Sub-Category-5</a></li>
          <li><a href="#">Sub-Sub-Category-6</a></li>
        </ul>
      </div>
    </li>
  </ul>
</div>
<div class="item">
  <input type="checkbox" id="C" />
  <label for="C">Category Three</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li><a href="#">Sub-Category Two</a></li>
    <li><a href="#">Sub-Category Three</a></li>
  </ul>
</div>
<div class="item">
  <input type="checkbox" id="D" />
  <label for="D">Category Four</label>
  <ul>
    <li><a href="#">Sub-Category One</a></li>
    <li><a href="#">Sub-Category Two</a></li>
    <li><a href="#">Sub-Category Three</a></li>
  </ul>
</div>

.item label {
  position: relative;
  width: 100%;
  display: block;
  padding-left: 2em;
}

.item label:before {
  position: absolute;
  content:'';
  left: 0;
  top: 0;
  width: 2em;
  height: 2em;
  background-image: url(https://png.icons8.com/material/50/000000/expand-arrow.png);
  background-position: center;
  background-repeat: no-repeat;
  background-size: 10px;
  transform: rotate(-90deg);
  transition: 0.1s;
}

label:hover {
  cursor: pointer;
  background-color: #f2f2f2;
  position: relative;
}
.item input:checked+label:before {
transform: rotate(0deg);
  transition: 0.1s;

这是一个fiddlehttps://jsfiddle.net/Jimujing/3b95ubsx/

Answer 3

尝试在 <label> 标签内设置图像。为此，您必须更改一些 css 和 html 代码。请在下面查看。 CSS

html,
body {
  width: 100%;
  margin: 0;
  padding: 0;
  font-family: helvetica;
}

/*Functionalty*/

.multi-level,
.item ul,
.nav input[type="checkbox"] {
  display: none;
}

#menu:checked~.multi-level,
.item input:checked~ul {
  display: block;
}

/*Arrow*/

.arrow {
  width: 10px;
  height: 10px;
  vertical-align: middle;
  float: left;
  margin: 9px 0.5em 0 2em;
}

.item .arrow {
  transform: rotate(-90deg);
  transition: 0.1s;
}

.item input:checked+.arrow {
  transform: rotate(0deg);
  transition: 0.1s;
}

img {
  z-index: 1;
  position: relative;
}

/*Styles*/

label:hover {
  cursor: pointer;
  background-color: #f2f2f2;
  position: relative;
}

li:hover {
  background-color: #f2f2f2;
}

label {
  width: 100%;
  display: block;
}

.nav {
  width: 100%;
  background-color: white;
  overflow-x: hidden;
  /*border-bottom: 1px solid #CFD8DC;*/
}

...

.nav ul,
.nav li,
label {
  line-height: 30px;
  margin: 0;
  padding: 0 2em;
  list-style: none;
  text-decoration: none;
  color: #000;
  font-weight: 100;
  width: 100%;
}
label {
    padding: 0;
}
.item ul {
  padding: 0 0.25em;
}

.nav li a {
  line-height: 30px;
  margin: 0;
  padding: 0 2em;
  list-style: none;
  text-decoration: none;
  color: #000;
  font-weight: 100;
}

.item {
  margin: 0 0 0 -1.5em;
}

.sub-item {
  padding: 0 0m;
}

HTML

<div class="nav">
    <input type="checkbox" id="menu" checked />
    <label for="menu"></label>
    <div class="multi-level">
        <div class="item">
            <input type="checkbox" id="A" />
            <label for="A"> <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"> Category One</label>
            <ul>
                <li><a href="#">Sub-Category One</a></li>
                <li><a href="#">Sub-Category Two</a></li>
                <li><a href="#">Sub-Category Three</a></li>
            </ul>
        </div>
        <div class="item">
            <input type="checkbox" id="B" />
            <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="B">Category Two</label>
            <ul>
                <li><a href="#">Sub-Category One</a></li>
                <li>
                    <div class="sub-item">
                        <input type="checkbox" id="B-A" />
                        <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="B-A">Sub-Category Two</label>
                        <ul>
                            <li><a href="#">Sub-Sub-Category-1</a></li>
                            <li><a href="#">Sub-Sub-Category-2</a></li>
                            <li><a href="#">Sub-Sub-Category-3</a></li>
                            <li><a href="#">Sub-Sub-Category-4</a></li>
                            <li><a href="#">Sub-Sub-Category-5</a></li>
                            <li><a href="#">Sub-Sub-Category-6</a></li>
                        </ul>
                    </div>
                </li>
            </ul>
        </div>
        <div class="item">
            <input type="checkbox" id="C" />
            <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="C">Category Three</label>
            <ul>
                <li><a href="#">Sub-Category One</a></li>
                <li><a href="#">Sub-Category Two</a></li>
                <li><a href="#">Sub-Category Three</a></li>
            </ul>
        </div>
        <div class="item">
            <input type="checkbox" id="D" />
            <img src="https://png.icons8.com/material/50/000000/expand-arrow.png" class="arrow"><label for="D">Category Four</label>
            <ul>
                <li><a href="#">Sub-Category One</a></li>
                <li><a href="#">Sub-Category Two</a></li>
                <li><a href="#">Sub-Category Three</a></li>
            </ul>
        </div>
    </div>
</div>

如何使用标签使 drop-down 箭头可点击

How to make drop-down arrow clickable with label

html

css

navigation

hover

clickable