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javascript - 加载时打开选项卡(有序列表)?

转载 作者:太空宇宙 更新时间:2023-11-04 16:04:47 27 4
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我按照示例使用 HTML 和 Javascript 制作选项卡式内容。链接在这里。

http://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_tabs

在这个例子中,我希望伦敦选项卡在页面加载后打开。我在 Javascript 代码中尝试过 Active/Non active 类,但似乎无法弄清楚。

<!DOCTYPE html>
<html>
<style>
body {font-family: "Lato", sans-serif;}

ul.tab {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
border: 1px solid #ccc;
background-color: #f1f1f1;
}

/* Float the list items side by side */
ul.tab li {float: left;}

/* Style the links inside the list items */
ul.tab li a {
display: inline-block;
color: black;
text-align: center;
padding: 14px 16px;
text-decoration: none;
transition: 0.3s;
font-size: 17px;
}

/* Change background color of links on hover */
ul.tab li a:hover {
background-color: #ddd;
}

/* Create an active/current tablink class */
ul.tab li a:focus, .active {
background-color: #ccc;
}

/* Style the tab content */
.tabcontent {
display: none;
padding: 6px 12px;
border: 1px solid #ccc;
border-top: none;
}
</style>
<body>

<p>Click on the links inside the tabbed menu:</p>

<ul class="tab">
<li><a href="#" class="tablinks" onclick="openCity(event, 'London')">London</a></li>
<li><a href="#" class="tablinks" onclick="openCity(event, 'Paris')">Paris</a></li>
<li><a href="#" class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</a></li>
</ul>

<div id="London" class="tabcontent">
<h3>London</h3>
<p>London is the capital city of England.</p>
</div>

<div id="Paris" class="tabcontent">
<h3>Paris</h3>
<p>Paris is the capital of France.</p>
</div>

<div id="Tokyo" class="tabcontent">
<h3>Tokyo</h3>
<p>Tokyo is the capital of Japan.</p>
</div>

<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>

</body>
</html>

最佳答案

在页面加载后触发对该元素的自动点击:

document.addEventListener("DOMContentLoaded", function() {
document.getElementById("default_city_link").click();
});

工作片段:

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.addEventListener("DOMContentLoaded", function() {
document.getElementById("default_city_link").click();
});
body {
font-family: "Lato", sans-serif;
}
ul.tab {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
border: 1px solid #ccc;
background-color: #f1f1f1;
}
/* Float the list items side by side */

ul.tab li {
float: left;
}
/* Style the links inside the list items */

ul.tab li a {
display: inline-block;
color: black;
text-align: center;
padding: 14px 16px;
text-decoration: none;
transition: 0.3s;
font-size: 17px;
}
/* Change background color of links on hover */

ul.tab li a:hover {
background-color: #ddd;
}
/* Create an active/current tablink class */

ul.tab li a:focus,
.active {
background-color: #ccc;
}
/* Style the tab content */

.tabcontent {
display: none;
padding: 6px 12px;
border: 1px solid #ccc;
border-top: none;
}
<p>Click on the links inside the tabbed menu:</p>

<ul class="tab">
<li><a href="#" id="default_city_link" class="tablinks" onclick="openCity(event, 'London')">London</a>
</li>
<li><a href="#" class="tablinks" onclick="openCity(event, 'Paris')">Paris</a>
</li>
<li><a href="#" class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</a>
</li>
</ul>

<div id="London" class="tabcontent">
<h3>London</h3>
<p>London is the capital city of England.</p>
</div>

<div id="Paris" class="tabcontent">
<h3>Paris</h3>
<p>Paris is the capital of France.</p>
</div>

<div id="Tokyo" class="tabcontent">
<h3>Tokyo</h3>
<p>Tokyo is the capital of Japan.</p>
</div>

关于javascript - 加载时打开选项卡(有序列表)?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38961821/

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