javascript - (HTML,CSS,JS) 试图添加可点击的下拉菜单，图标按钮

Question

我在我的网站导航栏上制作了“汉堡包”图标。我添加了简单的动画 JavaScript，效果很好。现在我想要图标打开 Clickable Dropdown，我有点困惑，因为我已经在使用脚本文件和类。

我不确定如何将两个 JS 代码组合到同一个类，以及如何使用原始图标栏编辑下 zipper 接..

这是我的图标:HTML:

<div class="hamburger" onclick="myFunction(this)"> 

        <div class="bar1"></div>
        <div class="bar2"></div>
        <div class="bar3"></div>

</div>

CSS:

.hamburger {
      cursor: pointer;
      color:#333;
      list-style: none;
      float: right;
      padding: 18px;
      position: relative;
      display: inline-block; 
}

Javascript:

function myFunction(x) {
    x.classList.toggle("change");
}

---

最后，这是我要添加的下拉列表:

HTML:

    <div class="dropdown">
      <button onclick="myFunction()" class="dropbtn">Dropdown</button>
      <div id="myDropdown" class="dropdown-content">
        <a href="#home">Home</a>
        <a href="#about">About</a>
        <a href="#contact">Contact</a>
      </div>
    </div>

CSS:

    .dropbtn {
      background-color: #3498DB;
      color: white;
      padding: 16px;
      font-size: 16px;
      border: none;
      cursor: pointer;
    }

    .dropbtn:hover, .dropbtn:focus {
      background-color: #2980B9;
    }

    .dropdown {
      position: relative;
      display: inline-block;
    }

    .dropdown-content {
      display: none;
      position: absolute;
      background-color: #f1f1f1;
      min-width: 160px;
      overflow: auto;
      box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
      z-index: 1;
    }

    .dropdown-content a {
      color: black;
      padding: 12px 16px;
      text-decoration: none;
      display: block;
    }

    .dropdown a:hover {background-color: #ddd;}

    .show {display: block;}

Javascript:

    function myFunction() {
      document.getElementById("myDropdown").classList.toggle("show");
    }

    // Close the dropdown if the user clicks outside of it
    window.onclick = function(event) {
      if (!event.target.matches('.dropbtn')) {
        var dropdowns = document.getElementsByClassName("dropdown-content");
        var i;
        for (i = 0; i < dropdowns.length; i++) {
          var openDropdown = dropdowns[i];
          if (openDropdown.classList.contains('show')) {
            openDropdown.classList.remove('show');
          }
        }
      }
    }

Answer 1

您可以对两个元素使用相同的函数。我认为主要问题是当在其外部单击时，您会使下拉列表消失。这个“外面”包括汉堡包菜单图标。

这是一个工作示例:

// Keep a refernce for dropdown to access it from any function
const dropdown = document.getElementById("myDropdown");

function myFunction() {
  dropdown.classList.toggle("show");
}

// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
  // Make sure ".hamburger" or any other class is included so when it is clicked it won't hide the dropdown
  if (!event.target.matches('.dropbtn, .hamburger')) {
    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}

.hamburger {
  cursor: pointer;
  color: #333;
  list-style: none;
  float: right;
  padding: 18px;
  position: relative;
  display: inline-block;
  width: 20px;
}

.hamburger>div {
  height: 2px;
  background-color: black;
  width: 100%;
  margin-bottom: 5px;
}

.dropbtn {
  background-color: #3498DB;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

.dropbtn:hover,
.dropbtn:focus {
  background-color: #2980B9;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  overflow: auto;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown a:hover {
  background-color: #ddd;
}

.show {
  display: block;
}

<div class="dropdown">
 <div class="hamburger" onclick="myFunction()">
    <div class="bar1"></div>
    <div class="bar2"></div>
    <div class="bar3"></div>
  </div>
  <div id="myDropdown" class="dropdown-content">
    <a href="#home">Home</a>
    <a href="#about">About</a>
    <a href="#contact">Contact</a>
  </div>
  
</div>