小贝子编程

为什么 HTML 选项卡在由活动设置时不显示其内容



显示一些选项卡。而 HTML 页面在浏览器上加载并显示其内容，因此它应该显示第一个选项卡信息，因为它已设置为活动状态。但是活动选项卡不显示其内容，它们在单击选项卡后正在工作。我只是想在任何选项卡上设置为活动时，它应该显示其内容而无需单击它们。这是我的代码。

<!DOCTYPE html>
<html>
   <head>
      <title></title>
      <style type="text/css">
         .sight_img{
         height: 80%;
         width: 100%;
         }
         .tab {
         overflow: hidden;
         border: 1px solid #ccc;
         background-color: #f1f1f1;
         }
         /* Style the buttons inside the tab */
         .tab button {
         background-color: inherit;
         float: left;
         border: none;
         outline: none;
         cursor: pointer;
         padding: 14px 16px;
         transition: 0.3s;
         font-size: 17px;
         }
         /* Change background color of buttons on hover */
         .tab button:hover {
         background-color: #ddd;
         }
         /* Create an active/current tablink class */
         .tab button.active {
         background-color: #ccc;
         display:block;
         }
         /* Style the tab content */
         .tabcontent {
         display: none;
         padding: 6px 12px;
         -webkit-animation: fadeEffect 1s;
         animation: fadeEffect 1s;
         }
         /* Fade in tabs */
         @-webkit-keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
         @keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
      </style>
   </head>
   <body>
      <div class="tab">
         <button class="tablinks btn active" onclick="openCity(event, 'Description')">Description</button>
         <button class="tablinks" onclick="openCity(event, 'Avalability')">Avalability</button>
         <button class="tablinks" onclick="openCity(event, 'Itinerary')">Itinerary</button>
         <button class="tablinks" onclick="openCity(event, 'Policy')">Policy</button>
      </div>
      <!-- // content-tabs-i // -->
      <div id="Description" class="tabcontent">
         <h3>Description</h3>
      </div>
      <div id="Avalability" class="tabcontent">
         <h3>Avalability</h3>
      </div>
      <div id="Itinerary" class="tabcontent">
         <h3>Itinerary</h3>
      </div>
      <div id="Policy" class="tabcontent">
         <h3>Policy</h3>
      </div>
   </body>
</html>
<script>
   function openCity(evt, cityName) {
     var i, tabcontent, tablinks;
     tabcontent = document.getElementsByClassName("tabcontent");
     for (i = 0; i < tabcontent.length; i++) {
       tabcontent[i].style.display = "none";
     }
     tablinks = document.getElementsByClassName("tablinks");
     for (i = 0; i < tablinks.length; i++) {
       tablinks[i].className = tablinks[i].className.replace(" active", "");
     }
     document.getElementById(cityName).style.display = "block";
     evt.currentTarget.className += " active";
   }
</script>

在这里你可以看到。 单击选项卡后，其选项卡的内容甚至显示我在第一个选项卡上使用了活动类。我只是希望这些选项卡应该显示其由活动设置的内容，而无需单击它。

将

style="display: block;"添加到选项卡内容div以显示默认div。

<!DOCTYPE html>
<html>
   <head>
      <title></title>
      <style type="text/css">
         .sight_img{
         height: 80%;
         width: 100%;
         }
         .tab {
         overflow: hidden;
         border: 1px solid #ccc;
         background-color: #f1f1f1;
         }
         /* Style the buttons inside the tab */
         .tab button {
         background-color: inherit;
         float: left;
         border: none;
         outline: none;
         cursor: pointer;
         padding: 14px 16px;
         transition: 0.3s;
         font-size: 17px;
         }
         /* Change background color of buttons on hover */
         .tab button:hover {
         background-color: #ddd;
         }
         /* Create an active/current tablink class */
         .tab button.active {
         background-color: #ccc;
         display:block;
         }
         /* Style the tab content */
         .tabcontent {
         display: none;
         padding: 6px 12px;
         -webkit-animation: fadeEffect 1s;
         animation: fadeEffect 1s;
         }
         /* Fade in tabs */
         @-webkit-keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
         @keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
      </style>
   </head>
   <body>
      <div class="tab">
         <button class="tablinks btn active" onclick="openCity(event, 'Description')">Description</button>
         <button class="tablinks" onclick="openCity(event, 'Avalability')">Avalability</button>
         <button class="tablinks" onclick="openCity(event, 'Itinerary')">Itinerary</button>
         <button class="tablinks" onclick="openCity(event, 'Policy')">Policy</button>
      </div>
      <!-- // content-tabs-i // -->
      <div id="Description" class="tabcontent" style="display: block;">
         <h3>Description</h3>
      </div>
      <div id="Avalability" class="tabcontent">
         <h3>Avalability</h3>
      </div>
      <div id="Itinerary" class="tabcontent">
         <h3>Itinerary</h3>
      </div>
      <div id="Policy" class="tabcontent">
         <h3>Policy</h3>
      </div>
   </body>
</html>
<script>
   function openCity(evt, cityName) {
     var i, tabcontent, tablinks;
     tabcontent = document.getElementsByClassName("tabcontent");
     for (i = 0; i < tabcontent.length; i++) {
       tabcontent[i].style.display = "none";
     }
     tablinks = document.getElementsByClassName("tablinks");
     for (i = 0; i < tablinks.length; i++) {
       tablinks[i].className = tablinks[i].className.replace(" active", "");
     }
     document.getElementById(cityName).style.display = "block";
     evt.currentTarget.className += " active";
   }
</script>

您在活动类中缺少 display：block，并且您也没有应用于第一个元素。

添加类

.active {
  display: block
}

和

应用 

 <div id="Description" class="tabcontent active">//added active
    <h3>Description</h3>
  </div>


.sight_img {
  height: 80%;
  width: 100%;
}
.tab {
  overflow: hidden;
  border: 1px solid #ccc;
  background-color: #f1f1f1;
}
/* Style the buttons inside the tab */
.tab button {
  background-color: inherit;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  transition: 0.3s;
  font-size: 17px;
}
/* Change background color of buttons on hover */
.tab button:hover {
  background-color: #ddd;
}
/* Create an active/current tablink class */
.tab button.active {
  background-color: #ccc;
  display: block;
}
/* Style the tab content */
.tabcontent {
  display: none;
  padding: 6px 12px;
  -webkit-animation: fadeEffect 1s;
  animation: fadeEffect 1s;
}
/* Fade in tabs */
@-webkit-keyframes fadeEffect {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes fadeEffect {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
.active {
  display: block
}
<!DOCTYPE html>
<html>
<head>
  <title></title>
  <style type="text/css">
  </style>
</head>
<body>
  <div class="tab">
    <button class="tablinks btn active" onclick="openCity(event, 'Description')">Description</button>
    <button class="tablinks" onclick="openCity(event, 'Avalability')">Avalability</button>
    <button class="tablinks" onclick="openCity(event, 'Itinerary')">Itinerary</button>
    <button class="tablinks" onclick="openCity(event, 'Policy')">Policy</button>
  </div>
  <!-- // content-tabs-i // -->
  <div id="Description" class="tabcontent active">
    <h3>Description</h3>
  </div>
  <div id="Avalability" class="tabcontent">
    <h3>Avalability</h3>
  </div>
  <div id="Itinerary" class="tabcontent">
    <h3>Itinerary</h3>
  </div>
  <div id="Policy" class="tabcontent">
    <h3>Policy</h3>
  </div>
</body>
</html>
<script>
  function openCity(evt, cityName) {
    var i, tabcontent, tablinks;
    tabcontent = document.getElementsByClassName("tabcontent");
    for (i = 0; i < tabcontent.length; i++) {
      tabcontent[i].style.display = "none";
    }
    tablinks = document.getElementsByClassName("tablinks");
    for (i = 0; i < tablinks.length; i++) {
      tablinks[i].className = tablinks[i].className.replace(" active", "");
    }
    document.getElementById(cityName).style.display = "block";
    evt.currentTarget.className += " active";
  }
</script>

在加载时添加选项卡内容Description的样式display:block

<!DOCTYPE html>
<html>
   <head>
      <title></title>
      <style type="text/css">
         .sight_img{
         height: 80%;
         width: 100%;
         }
         .tab {
         overflow: hidden;
         border: 1px solid #ccc;
         background-color: #f1f1f1;
         }
         /* Style the buttons inside the tab */
         .tab button {
         background-color: inherit;
         float: left;
         border: none;
         outline: none;
         cursor: pointer;
         padding: 14px 16px;
         transition: 0.3s;
         font-size: 17px;
         }
         /* Change background color of buttons on hover */
         .tab button:hover {
         background-color: #ddd;
         }
         /* Create an active/current tablink class */
         .tab button.active {
         background-color: #ccc;
         display:block;
         }
         /* Style the tab content */
         .tabcontent {
         display: none;
         padding: 6px 12px;
         -webkit-animation: fadeEffect 1s;
         animation: fadeEffect 1s;
         }
         /* Fade in tabs */
         @-webkit-keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
         @keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
      </style>
   </head>
   <body onload="loadFunction()">
      <div class="tab">
         <button class="tablinks btn active" onclick="openCity(event, 'Description')">Description</button>
         <button class="tablinks" onclick="openCity(event, 'Avalability')">Avalability</button>
         <button class="tablinks" onclick="openCity(event, 'Itinerary')">Itinerary</button>
         <button class="tablinks" onclick="openCity(event, 'Policy')">Policy</button>
      </div>
      <!-- // content-tabs-i // -->
      <div id="Description" class="tabcontent">
         <h3>Description</h3>
      </div>
      <div id="Avalability" class="tabcontent">
         <h3>Avalability</h3>
      </div>
      <div id="Itinerary" class="tabcontent">
         <h3>Itinerary</h3>
      </div>
      <div id="Policy" class="tabcontent">
         <h3>Policy</h3>
      </div>
   </body>
</html>
<script>
   function loadFunction(){
     document.getElementById('Description').style.display = "block";
   }
   function openCity(evt, cityName) {
     var i, tabcontent, tablinks;
     tabcontent = document.getElementsByClassName("tabcontent");
     for (i = 0; i < tabcontent.length; i++) {
       tabcontent[i].style.display = "none";
     }
     tablinks = document.getElementsByClassName("tablinks");
     for (i = 0; i < tablinks.length; i++) {
       tablinks[i].className = tablinks[i].className.replace(" active", "");
     }
     document.getElementById(cityName).style.display = "block";
     evt.currentTarget.className += " active";
   }
</script>

您可以使用

Javascript"单击"指定的选项卡按钮：

document.getElementById("default").click();


<!DOCTYPE html>
<html>
   <head>
      <title></title>
      <style type="text/css">
         .sight_img{
         height: 80%;
         width: 100%;
         }
         .tab {
         overflow: hidden;
         border: 1px solid #ccc;
         background-color: #f1f1f1;
         }
         /* Style the buttons inside the tab */
         .tab button {
         background-color: inherit;
         float: left;
         border: none;
         outline: none;
         cursor: pointer;
         padding: 14px 16px;
         transition: 0.3s;
         font-size: 17px;
         }
         /* Change background color of buttons on hover */
         .tab button:hover {
         background-color: #ddd;
         }
         /* Create an active/current tablink class */
         .tab button.active {
         background-color: #ccc;
         display:block;
         }
         /* Style the tab content */
         .tabcontent {
         display: none;
         padding: 6px 12px;
         -webkit-animation: fadeEffect 1s;
         animation: fadeEffect 1s;
         }
         /* Fade in tabs */
         @-webkit-keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
         @keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
      </style>
   </head>
   <body>
      <div class="tab">
         <button class="tablinks" id="default" onclick="openCity(event, 'Description')">Description</button>
         <button class="tablinks" onclick="openCity(event, 'Avalability')">Avalability</button>
         <button class="tablinks" onclick="openCity(event, 'Itinerary')">Itinerary</button>
         <button class="tablinks" onclick="openCity(event, 'Policy')">Policy</button>
      </div>
      <!-- // content-tabs-i // -->
      <div id="Description" class="tabcontent">
         <h3>Description</h3>
      </div>
      <div id="Avalability" class="tabcontent">
         <h3>Avalability</h3>
      </div>
      <div id="Itinerary" class="tabcontent">
         <h3>Itinerary</h3>
      </div>
      <div id="Policy" class="tabcontent">
         <h3>Policy</h3>
      </div>
   </body>
</html>
<script>
   function openCity(evt, cityName) {
     var i, tabcontent, tablinks;
     tabcontent = document.getElementsByClassName("tabcontent");
     for (i = 0; i < tabcontent.length; i++) {
       tabcontent[i].style.display = "none";
     }
     tablinks = document.getElementsByClassName("tablinks");
     for (i = 0; i < tablinks.length; i++) {
       tablinks[i].className = tablinks[i].className.replace(" active", "");
     }
     document.getElementById(cityName).style.display = "block";
     evt.currentTarget.className += " active";
   }
   document.getElementById("default").click();
</script>

你有一些不同的解决方案：

.JS：在加载事件时调用函数，因为它是 arg

openCity(event, 'Description')

CSS：添加一个活动类并将其添加到第一个div。

.tabcontent.active {
   display:block;
}

另一个 CSS：将所有 .tabcontent 包装在一个div 中，然后 

.tabcontent:first-of-type {
   display:block;
}

但是最后一个比其他的更具优势，因为它在未来的功能中更方便。

<!DOCTYPE html>
<html>
   <head>
      <title></title>
      <style type="text/css">
         .sight_img{
         height: 80%;
         width: 100%;
         }
         .tab {
         overflow: hidden;
         border: 1px solid #ccc;
         background-color: #f1f1f1;
         }
         /* Style the buttons inside the tab */
         .tab button {
         background-color: inherit;
         float: left;
         border: none;
         outline: none;
         cursor: pointer;
         padding: 14px 16px;
         transition: 0.3s;
         font-size: 17px;
         }
         /* Change background color of buttons on hover */
         .tab button:hover {
         background-color: #ddd;
         }
         /* Create an active/current tablink class */
         .tab button.active {
         background-color: #ccc;
         display:block;
         }
         /* Style the tab content */
         .tabcontent {
         display: none;
         padding: 6px 12px;
         -webkit-animation: fadeEffect 1s;
         animation: fadeEffect 1s;
         }
         /* HERE */
         .tabcontent.active {
            display:block;
         }
         /* Or you can add a wrapper for your contents 
              and then use this selector, to set your default.*/
         .tabcontent:first-of-type {
            display:block;
         }
         /* Fade in tabs */
         @-webkit-keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
         @keyframes fadeEffect {
         from {opacity: 0;}
         to {opacity: 1;}
         }
      </style>
   </head>
   <body>
      <div class="tab">
         <button class="tablinks btn active" onclick="openCity(event, 'Description')">Description</button>
         <button class="tablinks" onclick="openCity(event, 'Avalability')">Avalability</button>
         <button class="tablinks" onclick="openCity(event, 'Itinerary')">Itinerary</button>
         <button class="tablinks" onclick="openCity(event, 'Policy')">Policy</button>
      </div>
      <!-- // content-tabs-i // -->
      <div>
      <div id="Description" class="tabcontent">
         <h3>Description</h3>
      </div>
      <div id="Avalability" class="tabcontent">
         <h3>Avalability</h3>
      </div>
      <div id="Itinerary" class="tabcontent">
         <h3>Itinerary</h3>
      </div>
      <div id="Policy" class="tabcontent">
         <h3>Policy</h3>
      </div>
      </div>
   </body>
</html>
<script>
   function openCity(evt, cityName) {
     var i, tabcontent, tablinks;
     tabcontent = document.getElementsByClassName("tabcontent");
     for (i = 0; i < tabcontent.length; i++) {
       tabcontent[i].style.display = "none";
     }
     tablinks = document.getElementsByClassName("tablinks");
     for (i = 0; i < tablinks.length; i++) {
       tablinks[i].className = tablinks[i].className.replace(" active", "");
     }
     document.getElementById(cityName).style.display = "block";
     evt.currentTarget.className += " active";
   }
</script>

相关内容

最新更新


热门标签：

javascript python java c# php android html jquery c++ css ios sql mysql arrays asp.net json python-3.x ruby-on-rails .net sql-server django objective-c excel regex ruby linux ajax iphone xml vba spring asp.net-mvc database wordpress string postgresql wpf windows xcode bash git oracle list vb.net multithreading eclipse algorithm macos powershell visual-studio image forms numpy scala function api selenium