我正在尝试在网页加载时预先选择标签。基本上,当您在边栏中填充选项卡时,它将变为灰色,但是当网页首次加载时,它将被取消选中。
这是代码。
<!DOCTYPE html>
<html>
<head>
<title>Example title</title>
</head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<div>
<div class="w3-sidebar w3-bar-block w3-black w3-card-2" style="width:130px">
<button class="w3-bar-item w3-button tablink" onclick="openLink(event, 'Ex1')">Example 1</button>
<button class="w3-bar-item w3-button tablink" onclick="openLink(event, 'Ex2')">Example 2</button>
</div>
<div style="margin-left:130px">
<div id="Ex1" class="w3-container tab w3-animate-left" >
<h2>Example 1 header</h2>
<p>
Example 1 text
</p>
</div>
<div id="Ex2" class="w3-container tab" style="display:none">
<h2>Example 2 Header</h2>
<p>
Example 2 text.
</p>
</div>
</div>
<script>
function openLink(evt, animName) {
var i, x, tablinks;
x = document.getElementsByClassName("tab");
for (i = 0; i < x.length; i++) {
x[i].style.display = "none";
}
tablinks = document.getElementsByClassName("tablink");
for (i = 0; i < x.length; i++) {
tablinks[i].className = tablinks[i].className.replace(" w3-grey", "");
}
document.getElementById(animName).style.display = "block";
evt.currentTarget.className += " w3-grey";
}
</script>
答案 0 :(得分:0)
您的按钮 Ex1 和 Ex2 而不是示例1 和 Exemple2的onclick属性中的正确ID不匹配强>
window.onload = function() {
document.getElementsByClassName("w3-button")[0].click();
}
function openLink(evt, animName) {
var i, x, tablinks;
x = document.getElementsByClassName("tab");
for (i = 0; i < x.length; i++) {
x[i].style.display = "none";
}
tablinks = document.getElementsByClassName("tablink");
for (i = 0; i < x.length; i++) {
tablinks[i].className = tablinks[i].className.replace(" w3-grey", "");
}
document.getElementById(animName).style.display = "block";
evt.target.className += " w3-grey";
}
.w3-grey {
background-color: gray;
}
<div>
<div class="w3-sidebar w3-bar-block w3-black w3-card-2" style="width:130px">
<button class="w3-bar-item w3-button tablink" onclick="openLink(event, 'Example1')">Example 1</button>
<button class="w3-bar-item w3-button tablink" onclick="openLink(event, 'Example2')">Example 2</button>
</div>
<div style="margin-left:130px">
<div id="Example1" class="w3-container tab w3-animate-left" style="display:none">
<h2>Example 1 header</h2>
<p>
Example 1 text
</p>
</div>
<div id="Example2" class="w3-container tab" style="display:none">
<h2>Example 2 Header</h2>
<p>
Example 2 text.
</p>
</div>
</div>