我无法使侧边栏按钮沿HTML，CSS中的侧边栏移动

问题描述 投票：0回答：1

您好，我正在尝试为我的网站创建侧边栏，该侧边栏具有随其移动的打开/关闭按钮。

我基于代码w3school的示例，在该示例中，有两个单独的按钮用于打开和关闭。我不喜欢为任务分配两个单独的按钮，而是希望将它们组合在一起。所以我将示例修改为：

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
  font-family: "Lato", sans-serif;
}

.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #111;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidebar a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidebar a:hover {
  color: #f1f1f1;
}


.openbtn {
           font-size: 20px;
          cursor: pointer;
          position: fixed;
          bottom: 50%;
          left: 0;
          background-color: #111;
          color: white;
          padding: 10px 15px;
          border: none;
          z-index: 1;
          transition: 0.5s;
}

.openbtn:hover {
  background-color: #444;
}

#main {
  transition: margin-left .5s;
  padding: 16px;
}

/* On smaller screens, where height is less than 450px, change the style of the sidenav (less padding and a smaller font size) */
@media screen and (max-height: 450px) {
  .sidebar {padding-top: 15px;}
  .sidebar a {font-size: 18px;}
}
</style>
</head>
<body>

<div id="mySidebar" class="sidebar">
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>

<div id="main">
  <button id="sidebarButton" class="openbtn" onclick="sideButtonClicked()">☰</button>  
  <h2>Collapsed Sidebar</h2>
  <p>Click on the hamburger menu/bar icon to open the sidebar, and push this content to the right.</p>
</div>

<script>

        var lastState = false;
        
                function sideButtonClicked() {
          if(!lastState){
              //open
              lastState=true
              document.getElementById("mySidebar").style.width = "250px";
              document.getElementById("main").style.marginLeft = "250px";
              document.getElementById("sidebarButton").style.left = "250px";
          }
          else{
              //close
              lastState=false
              document.getElementById("mySidebar").style.width = "0px";
              document.getElementById("main").style.marginLeft= "0px";
              document.getElementById("sidebarButton").style.Left = "0px";
          }
          }
</script>
   
</body>
</html>

如果您尝试运行代码，则第一次单击该按钮时，侧边栏将打开，并且按钮也会随之出现。那太好了，我想要它做，问题是关闭侧边栏时按钮没有回到其原始位置。侧边栏打开和关闭都没有问题，但似乎这行代码不起作用

document.getElementById("sidebarButton").style.Left = "0px";

任何想法如何解决？

javascript html css
1个回答
0
投票

尽管样式属性在样式表中不区分大小写，但是样式的JavaScript API区分大小写。因此，由于正确的属性名称是style.Left，因此无法设置left。

document.getElementById("sidebarButton").style.left = '0';
0
投票

您有错别字document.getElementById("sidebarButton").style.Left应该是document.getElementById("sidebarButton").style.left

var lastState = false;

function sideButtonClicked() {
  if (!lastState) {
    //open
    lastState = true
    document.getElementById("mySidebar").style.width = "250px";
    document.getElementById("main").style.marginLeft = "250px";
    document.getElementById("sidebarButton").style.left = "250px";
  } else {
    //close
    lastState = false
    document.getElementById("mySidebar").style.width = "0px";
    document.getElementById("main").style.marginLeft = "0px";
    document.getElementById("sidebarButton").style.left = "0px";
  }
}
body {
  font-family: "Lato", sans-serif;
}

.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #111;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidebar a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidebar a:hover {
  color: #f1f1f1;
}

.openbtn {
  font-size: 20px;
  cursor: pointer;
  position: fixed;
  bottom: 50%;
  left: 0;
  background-color: #111;
  color: white;
  padding: 10px 15px;
  border: none;
  z-index: 1;
  transition: 0.5s;
}

.openbtn:hover {
  background-color: #444;
}

#main {
  transition: margin-left .5s;
  padding: 16px;
}


/* On smaller screens, where height is less than 450px, change the style of the sidenav (less padding and a smaller font size) */

@media screen and (max-height: 450px) {
  .sidebar {
    padding-top: 15px;
  }
  .sidebar a {
    font-size: 18px;
  }
}
<div id="mySidebar" class="sidebar">
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>

<div id="main">
  <button id="sidebarButton" class="openbtn" onclick="sideButtonClicked()">☰</button>
  <h2>Collapsed Sidebar</h2>
  <p>Click on the hamburger menu/bar icon to open the sidebar, and push this content to the right.</p>
</div>
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