Question

我已经在网页上创建了导航栏，并为此获得了W3School（https://www.w3schools.com/howto/howto_js_responsive_navbar_dropdown.asp）的帮助。我想在右侧放置导航链接，其顺序应为“从左到右”。但是按钮的位置（顺序）是从“右到左”，如下图所示。有人可以指导我我在代码中哪里做错了吗？我是Web开发的初学者。

所需的输出应如下所示：

另一个例子

订购

这是我的代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication2.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server"><title></title>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"/>
<style>
body {margin:0;font-family:Arial}


.topnav {
  overflow: hidden;
  background-color:#37312f;
  padding: 12px 14px;
}

.topnav a {
  float: right;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 12px 14px;
  text-decoration: none;
  font-size: 17px;
}

 .topnav a.logo {
                    font-size: 25px;
                    font-weight: bold;
                    color: #fff;
                }

   .topnav-right {
            float:left;
            /*height: 53px;*/
        }


.active {
  background-color: #4CAF50;
  color: white;
}

.topnav .icon {
  display: none;
}

.dropdown {
  float: right;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 17px;    
  border: none;
  outline: none;
  color: white;
  padding: 12px 14px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: -de1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 14px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: #555;
  color: white;
}

.dropdown-content a:hover {
  background-color: #ddd;
  color: black;
}

.dropdown:hover .dropdown-content {
  display: block;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child), .dropdown .dropbtn {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {float: none;}
  .topnav.responsive .dropdown-content {position: relative;}
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}
</style>
</head>
<body>
    <form id="form2" runat="server">
       <div class="topnav" id="myTopnav">
  <a href="#home" class="active">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <div class="dropdown">
    <button class="dropbtn">Dropdown 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
      <a href="#">Link 1</a>
      <a href="#">Link 2</a>
      <a href="#">Link 3</a>
    </div>
  </div> 
  <a href="#about">About</a>
  <a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">&#9776;</a>
</div>

<div style="padding-left:16px">
  <h2>Responsive Topnav with Dropdown</h2>
  <p>Resize the browser window to see how it works.</p>
  <p>Hover over the dropdown button to open the dropdown menu.</p>
</div>

<script>
    function myFunction() {
        var x = document.getElementById("myTopnav");
        if (x.className === "topnav") {
            x.className += " responsive";
        } else {
            x.className = "topnav";
        }
    }
</script>
    </form>
</body>
</html>

Answer 1

只需从 topnav a 中删除float:right，然后将display:flex添加到 .topnav 中，使其水平对齐。

当您对每个<a>元素应用 float-right 时， CSS 分别将它们浮动到右侧会导致顺序反转。

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server"><title></title>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"/>
<style>
body {margin:0;font-family:Arial}


.topnav {
  overflow: hidden;
  background-color:#37312f;
  padding: 12px 14px;
  display: flex;
  justify-content: flex-end;
}

.topnav a {
  color: #f2f2f2;
  text-align: center;
  padding: 12px 14px;
  text-decoration: none;
  font-size: 17px;
}

 .topnav a.logo {
                    font-size: 25px;
                    font-weight: bold;
                    color: #fff;
                }

   .topnav-right {
            float:left;
            /*height: 53px;*/
        }


.active {
  background-color: #4CAF50;
  color: white;
}

.topnav .icon {
  display: none;
}

.dropdown {
  float: right;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 17px;    
  border: none;
  outline: none;
  color: white;
  padding: 12px 14px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: -de1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 14px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: #555;
  color: white;
}

.dropdown-content a:hover {
  background-color: #ddd;
  color: black;
}

.dropdown:hover .dropdown-content {
  display: block;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child), .dropdown .dropbtn {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {float: none;}
  .topnav.responsive .dropdown-content {position: relative;}
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}
</style>
</head>
<body>
    <form id="form2" runat="server">
       <div class="topnav" id="myTopnav">
  <a href="#home" class="active">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <div class="dropdown">
    <button class="dropbtn">Dropdown 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
      <a href="#">Link 1</a>
      <a href="#">Link 2</a>
      <a href="#">Link 3</a>
    </div>
  </div> 
  <a href="#about">About</a>
  <a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">&#9776;</a>
</div>

<div style="padding-left:16px">
  <h2>Responsive Topnav with Dropdown</h2>
  <p>Resize the browser window to see how it works.</p>
  <p>Hover over the dropdown button to open the dropdown menu.</p>
</div>

<script>
    function myFunction() {
        var x = document.getElementById("myTopnav");
        if (x.className === "topnav") {
            x.className += " responsive";
        } else {
            x.className = "topnav";
        }
    }
</script>
    </form>
</body>
</html>

Answer 2

您的 splice CSS类包含

.topnav a

float: right; CSS类还包含

.dropdown

将其更改为float: right;

float: left;

还更改了 .topnav a { float: left; <= Change here from right to left color: #f2f2f2; text-align: center; padding: 12px 14px; text-decoration: none; font-size: 17px; } .dropdown { float: left; <= Change here from right to left overflow: hidden; } CSS类，

.topnav-right

并使用类似HTML的样式

.topnav-right {
    float: right;            <= Change here left to right
}

最后，您的代码将成为

<div class="topnav" id="myTopnav">
  <div class="topnav-right">
      ...
  </div>
</div>

Answer 3

我没有发现任何错误，请尝试复制此代码

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
body {margin:0;font-family:Arial}

.topnav {
  overflow: hidden;
  background-color: #333;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.active {
  background-color: #4CAF50;
  color: white;
}

.topnav .icon {
  display: none;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 17px;    
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: #555;
  color: white;
}

.dropdown-content a:hover {
  background-color: #ddd;
  color: black;
}

.dropdown:hover .dropdown-content {
  display: block;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child), .dropdown .dropbtn {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {float: none;}
  .topnav.responsive .dropdown-content {position: relative;}
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}
</style>
</head>
<body>

<div class="topnav" id="myTopnav">
  <a href="#home" class="active">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <div class="dropdown">
    <button class="dropbtn">Dropdown 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
      <a href="#">Link 1</a>
      <a href="#">Link 2</a>
      <a href="#">Link 3</a>
    </div>
  </div> 
  <a href="#about">About</a>
  <a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">&#9776;</a>
</div>

<div style="padding-left:16px">
  <h2>Responsive Topnav with Dropdown</h2>
  <p>Resize the browser window to see how it works.</p>
  <p>Hover over the dropdown button to open the dropdown menu.</p>
</div>

<script>
function myFunction() {
  var x = document.getElementById("myTopnav");
  if (x.className === "topnav") {
    x.className += " responsive";
  } else {
    x.className = "topnav";
  }
}
</script>

</body>
</html>

如何正确对齐网页的导航栏？

3 个答案: