将下拉内容与下拉按钮对齐

时间：2017-08-29 10:38:41

标签： javascript html css drop-down-menu

我过去几天一直试图解决这个问题。我有一个下拉按钮和一些下拉内容。它完美地运作。我遇到的问题是Dropdown内容没有与按钮对齐。除了按钮之外，它位于任何位置，具体取决于页面的大小调整方式。

我想我做错了什么，到目前为止我尝试的一切都没有正常工作。

这是我的代码：

＆＃13;
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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('#dropdown')) {

    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');
      }
    }
  }
}
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.navigator {
  font-family: sans-serif;
  background-color: #f4f4f4;
  height: 80px;
  width: 100%;
  position: fixed;
}

.navigator #navigator-contents {
  width: 85%;
  text-align: center;
  margin: 0 auto;
}

.navigator #navigator-contents .logo {
  background-color: #f4f4f4;
  float: left;
  height: 80px;
  line-height: 82px;
}

.navigator #navigator-contents .logo img {
  vertical-align: middle;
}

.navigator #navigator-contents .logo h2 {
  font-size: 1.40em;
  display: inline;
  vertical-align: middle;
  margin: 0;
}

.navigator #navigator-contents .clock {
  float: right;
  height: 80px;
  width: 100px;
  line-height: 80px;
}

.navigator #navigator-contents .clock img {
  vertical-align: middle;
}

.navigator #navigator-contents .clock h4 {
  display: inline;
  vertical-align: middle;
  margin: 0;
  margin-left: -1px;
}

.navigator #navigator-contents .dropdown {
  width: 100px;
  height: 80px;
  display: inline-block;
  line-height: 82px;
  position: relative;
  cursor: pointer;
  outline: none;
  float: right;
}

.navigator #navigator-contents .dropdown:hover {
  background-color: #e5e5e5;
  color: #000;
}

.navigator #navigator-contents .dropdown:focus {
  background-color: #1a5dad;
  color: #fff;
}

.navigator #navigator-contents .dropdown h4 {
  display: inline;
  vertical-align: middle;
}

.navigator #navigator-contents .dropdown-content {
  border-bottom-right-radius: 7px;
  border-bottom-left-radius: 7px;
  background-color: #f4f4f4;
  display: none;
  position: absolute;
  z-index: 1;
  margin-top: 80px;
}

.navigator #navigator-contents .dropdown-content .drop-content {
  display: inline-block;
  padding: 30px;
  float: left;
}

.navigator #navigator-contents .dropdown-content .drop-content span {
  font-size: 16px;
  display: inline;
  vertical-align: middle;
  margin: 0;
  margin-left: -1px;
  right: 5px;
}

.navigator #navigator-contents .dropdown-content .drop-content i {
  font-size: 1.10em;
}

.navigator #navigator-contents .dropdown-content .drop-content:hover {
  transition: all .2s;
  background-color: #1a5dad;
  color: #fff;
  border-bottom-right-radius: 5px;
  border-bottom-left-radius: 5px;
}

.navigator #navigator-contents .show {
  border-top: 2px solid #1a5dad;
  display: block;
}
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<div class="navigator">
  <div id="navigator-contents">
    <div class="clock">
      <a href="#">
        <h4>Time: </h4>
        <h4>13:34</h4>
      </a>
    </div>
    <div class="dropdown" id="dropdown" onclick="myFunction()">
      <h4 id="dropdown">Home <i class="fa fa-caret-down" aria-hidden="true"></i></h4>
    </div>
    <div class="dropdown-content" id="myDropdown">
      <a href="#">
        <div class="drop-content">
          <span>This</span>
        </div>
      </a>
      <a href="#">
        <div class="drop-content">
          <span>Is</span>
        </div>
      </a>
      <a href="#">
        <div class="drop-content">
          <span>Dropdown</span>
        </div>
      </a>
      <a href="#">
        <div class="drop-content">
          <span>Content</span>
        </div>
      </a>
    </div>
  </div>
</div>
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我希望实现的目标：Image

所以，我的问题是 - 如何将下拉内容与菜单按钮对齐并使其保持在那里，即使它已调整大小？

2 个答案:

答案 0 :(得分：1)

将position:relative添加到.navigator #navigator-contents。并为right

添加100px值.navigator #navigator-contents .clock（.navigator #navigator-contents .dropdown-content的宽度）

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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('#dropdown')) {

    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');
      }
    }
  }
}
＆＃13; 
.navigator {
  font-family: sans-serif;
  background-color: #f4f4f4;
  height: 80px;
  width: 100%;
  position: fixed;
}

.navigator #navigator-contents {
  width: 85%;
  text-align: center;
  margin: 0 auto; position:relative
}

.navigator #navigator-contents .logo {
  background-color: #f4f4f4;
  float: left;
  height: 80px;
  line-height: 82px;
}

.navigator #navigator-contents .logo img {
  vertical-align: middle;
}

.navigator #navigator-contents .logo h2 {
  font-size: 1.40em;
  display: inline;
  vertical-align: middle;
  margin: 0;
}

.navigator #navigator-contents .clock {
  float: right;
  height: 80px;
  width: 100px;
  line-height: 80px;
}

.navigator #navigator-contents .clock img {
  vertical-align: middle;
}

.navigator #navigator-contents .clock h4 {
  display: inline;
  vertical-align: middle;
  margin: 0;
  margin-left: -1px;
}

.navigator #navigator-contents .dropdown {
  width: 100px;
  height: 80px;
  display: inline-block;
  line-height: 82px;
  position: relative;
  cursor: pointer;
  outline: none;
  float: right;
}

.navigator #navigator-contents .dropdown:hover {
  background-color: #e5e5e5;
  color: #000;
}

.navigator #navigator-contents .dropdown:focus {
  background-color: #1a5dad;
  color: #fff;
}

.navigator #navigator-contents .dropdown h4 {
  display: inline;
  vertical-align: middle;
}

.navigator #navigator-contents .dropdown-content {
  border-bottom-right-radius: 7px;
  border-bottom-left-radius: 7px;
  background-color: #f4f4f4;
  display: none;
  position: absolute;
  z-index: 1;
  margin-top: 80px;     right: 100px;
}

.navigator #navigator-contents .dropdown-content .drop-content {
  display: inline-block;
  padding: 30px;
  float: left;
}

.navigator #navigator-contents .dropdown-content .drop-content span {
  font-size: 16px;
  display: inline;
  vertical-align: middle;
  margin: 0;
  margin-left: -1px;
  right: 5px;
}

.navigator #navigator-contents .dropdown-content .drop-content i {
  font-size: 1.10em;
}

.navigator #navigator-contents .dropdown-content .drop-content:hover {
  transition: all .2s;
  background-color: #1a5dad;
  color: #fff;
  border-bottom-right-radius: 5px;
  border-bottom-left-radius: 5px;
}

.navigator #navigator-contents .show {
  border-top: 2px solid #1a5dad;
  display: block;
}
＆＃13; 
<div class="navigator">
  <div id="navigator-contents">
    <div class="clock">
      <a href="#">
        <h4>Time: </h4>
        <h4>13:34</h4>
      </a>
    </div>
    <div class="dropdown" id="dropdown" onclick="myFunction()">
      <h4 id="dropdown">Home <i class="fa fa-caret-down" aria-hidden="true"></i></h4>
    </div>
    <div class="dropdown-content" id="myDropdown">
      <a href="#">
        <div class="drop-content">
          <span>This</span>
        </div>
      </a>
      <a href="#">
        <div class="drop-content">
          <span>Is</span>
        </div>
      </a>
      <a href="#">
        <div class="drop-content">
          <span>Dropdown</span>
        </div>
      </a>
      <a href="#">
        <div class="drop-content">
          <span>Content</span>
        </div>
      </a>
    </div>
  </div>
</div>
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答案 1 :(得分：0)

见下文。我让id myDropdown成为身份dropdown的孩子，以利用绝对定位。现在myDropdown绝对位于右侧，值为零。

此外，我将myDropdown更改为弹性框。

＆＃13;
＆＃13; 
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('#dropdown')) {

    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');
      }
    }
  }
}
＆＃13; 
.navigator {
  font-family: sans-serif;
  background-color: #f4f4f4;
  height: 80px;
  width: 100%;
  position: fixed;
}

.navigator #navigator-contents {
  width: 85%;
  text-align: center;
  margin: 0 auto;
}

.navigator #navigator-contents .logo {
  background-color: #f4f4f4;
  float: left;
  height: 80px;
  line-height: 82px;
}

.navigator #navigator-contents .logo img {
  vertical-align: middle;
}

.navigator #navigator-contents .logo h2 {
  font-size: 1.40em;
  display: inline;
  vertical-align: middle;
  margin: 0;
}

.navigator #navigator-contents .clock {
  float: right;
  height: 80px;
  width: 100px;
  line-height: 80px;
}

.navigator #navigator-contents .clock img {
  vertical-align: middle;
}

.navigator #navigator-contents .clock h4 {
  display: inline;
  vertical-align: middle;
  margin: 0;
  margin-left: -1px;
}

.navigator #navigator-contents .dropdown {
  width: 100px;
  height: 80px;
  display: inline-block;
  line-height: 82px;
  position: relative;
  cursor: pointer;
  outline: none;
  float: right;
}

.navigator #navigator-contents .dropdown:hover {
  background-color: #e5e5e5;
  color: #000;
}

.navigator #navigator-contents .dropdown:focus {
  background-color: #1a5dad;
  color: #fff;
}

.navigator #navigator-contents .dropdown h4 {
  display: inline;
  vertical-align: middle;
}

.navigator #navigator-contents .dropdown-content {
  border-bottom-right-radius: 7px;
  border-bottom-left-radius: 7px;
  background-color: #f4f4f4;
  display: none;
  position: absolute;
}

.navigator #navigator-contents .dropdown-content .drop-content {
  padding: 30px;
}

.navigator #navigator-contents .dropdown-content .drop-content span {
  font-size: 16px;
  display: inline;
  vertical-align: middle;
  margin: 0;
  margin-left: -1px;
  right: 5px;
}

.navigator #navigator-contents .dropdown-content .drop-content i {
  font-size: 1.10em;
}

.navigator #navigator-contents .dropdown-content .drop-content:hover {
  transition: all .2s;
  background-color: #1a5dad;
  color: #fff;
  border-bottom-right-radius: 5px;
  border-bottom-left-radius: 5px;
}

.navigator #navigator-contents .show {
  border-top: 2px solid #1a5dad;
  display: flex;
  right: 0;
}
＆＃13; 
<div class="navigator">
  <div id="navigator-contents">
    <div class="clock">
      <a href="#">
        <h4>Time: </h4>
        <h4>13:34</h4>
      </a>
    </div>
    <div class="dropdown" id="dropdown" onclick="myFunction()">
      <h4 id="dropdown">Home <i class="fa fa-caret-down" aria-hidden="true"></i></h4>

      <div class="dropdown-content" id="myDropdown">
        <a href="#">
          <div class="drop-content">
            <span>This</span>
          </div>
        </a>
        <a href="#">
          <div class="drop-content">
            <span>Is</span>
          </div>
        </a>
        <a href="#">
          <div class="drop-content">
            <span>Dropdown</span>
          </div>
        </a>
        <a href="#">
          <div class="drop-content">
            <span>Content</span>
          </div>
        </a>
      </div>
    </div>
  </div>
</div>
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