滚动条未显示在我的第一个网站文件中

编程问答 2022-06-10

问题描述

我已经研究了许多不同的问题，但是找不到解决方案，为什么我的滚动条没有显示。 我希望有人能告诉我原因。

<!DOCTYPE html>
<style>
  
  
    .btn {
  background-color: rgb(126,128,129); /* Blue background */
  border: none; /* Remove borders */
  color: rgb(255,255,255); /* White text */
  padding: 12px 16px; /* Some padding */
  font-size: 15px; /* Set a font size */
  cursor: pointer; }/* Mouse pointer on hover */
    .btn:hover {background-color: rgb(172,172,172);}
    .btn {float: right}
    img.resize {
        float: left;
  width:285px;
  height:75px;
} 
.topnav {
   
  background-color: rgb(185,29,29);
  overflow: auto;
}

.topnav a {
  top: 0px;
  position:fixed;
  color: #f2f2f2;
  text-align: center;
  padding: 0px;
  text-decoration: none;
  font-size: 17px;
}
.topnav2 {
  margin-top:30px; 
  background-color: rgb(255,255);
  overflow:auto;}
.topnav2 a.active {
    background-color: #4CAF50;
    color: white;}
    .topnav2 a:hover {
  background-color: #ddd;
  color: black;
}
.topnav a.active {
  background-color: #4CAF50;
  color: white;
}
.dropbtn {
background-color: rgb(255,255);
   border: none;
   color:rgb(126,129);
   font-size: 14px;

}
.dropdown {
  float: left;
  overflow: auto;
}
.dropdown .dropbtn {
  font-size: 14px;
  border: none;
  outline: none;
  color: rgb(153,153,153);
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit; /* Important for vertical align on mobile phones */
  margin: 0; /* Important for vertical align on mobile phones */
}
.dropdown-content a {
  float: none;
  color: rgb(160,160,160);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}
.dropdown-content a:hover {
  background-color: #ddd;
}
.dropdown:hover .dropdown-content {
  display: block;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  Box-shadow: 0px 8px 16px 0px rgba(0,0.2);
  z-index: 1;
}
.sticky {
    margin-top: 50px;
  position: fixed;
  top: 0;
  width: 100%;
}
.sticky2 {
    margin-top: 15px;
  position: fixed;
  top: 0;
  width: 100%;
}

#search {margin-right: 1px;}

#scrollbar {overflow-y: scroll;
height:100ex;}
</style>

<html>    
<body  id="scrollbar">
  
<title>ILIAS DHfPG</title>
<div class="topnav ; sticky2">
<button class="btn">Anmelden</button>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<button id="search" class="btn"><i class="fa fa-search"></i></button>
</div>
<div class=sticky>
<div><img class="resize" src='https://ilias.dhfpg.de/Customizing/global/skin/dhfpgde/images/HeaderIcon.svg'></div>
<div class=topnav2>
    
<div class=dropdown>
    <button style="font-family:arial"  class=dropbtn>ILIAS-Überblick</button>
    <i style="color: grey" class="fa fa-caret-down"></i>
<div style="font-size: 14px;font-family:arial"  class="dropdown-content">
        <a href="#">öffentlich</a>
        <p style="font-size:13px;background-color:rgb(185,29);color:rgb(255,255)">Weiterbildungsmöglichkeiten</p>
        <a href="#">Annerkennung Trainerlizenzen</a>
        <a href="#">Weiterbildungs bei der BSA-Akademie</a>
        <a href="#">Weiterbildung an der DHfPG</a> 
</div>
</div>
<div class=dropdown>
    <button style="font-family:arial" class=dropbtn>Service</button> 
    <i style="color: grey;" class="fa fa-caret-down"></i>
<div style="font-size: 14px;font-family:arial"  class="dropdown-content">
        <a href="#">FAQ-ILIAS-Nutzung</a>
</div>
</div>
<div class=dropdown>
    <button  style="font-family:arial" class=dropbtn>Zuletzt besucht</button>
    <i style="color: grey" class="fa fa-caret-down"></i>
    <div style="font-size: 14px;font-family:arial"  class="dropdown-content">
        <a href="#">Zuletzt besuche Seite</a>
    </div>
</div>
</div>

那是代码段。 如果需要更多代码，请告诉我。 我现在添加了一些代码。 我在下面有一个很长的段落，所以该网站 充满并且有滚动的内容。

解决方法

这是因为您的身高已满，无需滚动（当您可以看到所有内容时），当高度受限时会显示“滚动”，而不会显示所有滚动条来帮助您查看物品。

编辑：您使用过position: fixed;和position: fixed;的元素是相对于视口放置的，这意味着即使滚动页面，它也始终位于同一位置。 top，right，bottom和left属性用于定位元素。 

<body id="scrollbar">
    
<style>
  
  
    .btn {
  background-color: rgb(126,128,129); /* Blue background */
  border: none; /* Remove borders */
  color: rgb(255,255,255); /* White text */
  padding: 12px 16px; /* Some padding */
  font-size: 15px; /* Set a font size */
  cursor: pointer; }/* Mouse pointer on hover */
    .btn:hover {background-color: rgb(172,172,172);}
    .btn {float: right}
    img.resize {
        float: left;
  width:285px;
  height:75px;
} 
.topnav {
   
  background-color: rgb(185,29,29);
  overflow: auto;
}

.topnav a {
  top: 0px;
  color: #f2f2f2;
  text-align: center;
  padding: 0px;
  text-decoration: none;
  font-size: 17px;
}
.topnav2 {
  margin-top:30px; 
  background-color: rgb(255,255);
  overflow:auto;}
.topnav2 a.active {
    background-color: #4CAF50;
    color: white;}
    .topnav2 a:hover {
  background-color: #ddd;
  color: black;
}
.topnav a.active {
  background-color: #4CAF50;
  color: white;
}
.dropbtn {
background-color: rgb(255,255);
   border: none;
   color:rgb(126,129);
   font-size: 14px;

}
.dropdown {
  float: left;
  overflow: auto;
}
.dropdown .dropbtn {
  font-size: 14px;
  border: none;
  outline: none;
  color: rgb(153,153,153);
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit; /* Important for vertical align on mobile phones */
  margin: 0; /* Important for vertical align on mobile phones */
}
.dropdown-content a {
  float: none;
  color: rgb(160,160,160);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}
.dropdown-content a:hover {
  background-color: #ddd;
}
.dropdown:hover .dropdown-content {
  display: block;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0.2);
  z-index: 1;
}
.sticky {
    margin-top: 50px;
  
  top: 0;
  width: 100%;
}
.sticky2 {
    margin-top: 15px;
 
  top: 0;
  width: 100%;
}

#search {margin-right: 1px;}

#scrollbar {overflow-y: scroll;
height:100ex;}
</style>

    

  
<title>ILIAS DHfPG</title>
<div class="topnav ; sticky2">
<button class="btn">Anmelden</button>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<button id="search" class="btn"><i class="fa fa-search"></i></button>
</div>
<div class="sticky">
<div><img class="resize" src="https://ilias.dhfpg.de/Customizing/global/skin/dhfpgde/images/HeaderIcon.svg"></div>
<div class="topnav2">
    
<div class="dropdown">
    <button style="font-family:arial" class="dropbtn">ILIAS-Überblick</button>
    <i style="color: grey" class="fa fa-caret-down"></i>
<div style="font-size: 14px;font-family:arial" class="dropdown-content">
        <a href="#">öffentlich</a>
        <p style="font-size:13px;background-color:rgb(185,29);color:rgb(255,255)">Weiterbildungsmöglichkeiten</p>
        <a href="#">Annerkennung Trainerlizenzen</a>
        <a href="#">Weiterbildungs bei der BSA-Akademie</a>
        <a href="#">Weiterbildung an der DHfPG</a> 
</div>
</div>
<div class="dropdown">
    <button style="font-family:arial" class="dropbtn">Service</button> 
    <i style="color: grey;" class="fa fa-caret-down"></i>
<div style="font-size: 14px;font-family:arial" class="dropdown-content">
        <a href="#">FAQ-ILIAS-Nutzung</a>
</div>
</div>
<div class="dropdown">
    <button style="font-family:arial" class="dropbtn">Zuletzt besucht</button>
    <i style="color: grey" class="fa fa-caret-down"></i>
    <div style="font-size: 14px;font-family:arial" class="dropdown-content">
        <a href="#">Zuletzt besuche Seite</a>
    </div>
</div>
</div>
    <script type="text/javascript">
        
    </script>

</div><div class="as-console-wrapper"><div class="as-console"></div></div></body>

,

您的滚动条正在工作，但似乎不起作用，因为您的div位置是固定的。将其更改为static（默认），或者您可以删除该文件，并且只要页面大小超出设备高度，它就会在页面上自动添加滚动条，以防止内容溢出。

尝试一下：

#scrollbar {overflow-y: scroll;
height:200ex;}

.sticky2 {
    margin-top: 15px;
  position: fixed;
  top: 0;
  width: 100%;
}

.sticky {
    margin-top: 50px;
  position: fixed;
  top: 0;
  width: 100%;
}
htmlscrollbarscrollbarwebweb