Why does clicking the tabs inside a Content Editor Web Part cause my page to refresh?
-
08-02-2021 - |
Frage
I'm back with more questions. I recently wrote up some HTML (to create a set of three tabs) and put it on the page with the HTML Form Web Part. But now, whenever I click on one of the tabs in order to view the content, the entire page refreshes. How can I stop that from happening?
For reference, here's the code, although I can't see how that could be causing the issue:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {font-family: Arial;}
/* Style the tab */
.tab {
overflow: hidden;
border: 1px solid #ccc;
background-color: #f1f1f1;
text-align: center
}
/* Style the buttons inside the tab */
.tab button {
background-color: inherit;
float: center;
border: none;
outline: none;
cursor: pointer;
padding: 14px 16px;
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;
}
/* Style the tab content */
.tabcontent {
display: none;
padding: 6px 12px;
border: 1px solid #ccc;
border-top: none;
}
.tabcontent {
animation: fadeEffect 1s; /* Fading effect takes 1 second */
}
/* Gofrom zero to full opacity */
@keyframes fadeEffect {
from {opacity: 0;}
to {opacity: 1;}
}
</style>
</head>
<body>
<p>Further information for Admin Users can be found <a href=" ">here.</a>
<div class="tab">
<button class="tablinks" onclick="openCity(event, 'London')">New User's
Guide</button>
<button class="tablinks" onclick="openCity(event, 'Paris')">How To's</button>
<button class="tablinks" onclick="openCity(event, 'Madrid')">What to Know</button>
<!--This is New User's Guide-->
<div id="London" class="tabcontent">
<h3>Links to Training Videos</h3>
<ol>
</ol>
<ul>
</ul>
</div>
<!-- This is How To's-->
<div id="Paris" class="tabcontent">
<style>
* {
box-sizing: border-box;
}
/* Create four equal columns that floats next to each other */
.column {
float: left;
width: 25%;
padding: 10px;
height: 300px; /* Should be removed. Only for demonstration */
}
/* Clear floats after the columns */
.row:after {
content: "";
display: table;
clear: both;
}
</style>
</head>
<body>
<div class="row">
<div class="column" style="background-color:#aaa;">
<h2>For Cases</h2>
<ul>
</ul>
</div>
<div class="column" style="background-color:#bbb;">
<h2>For Technical Inventory</h2>
<ul>
</ul>
</div>
<div class="column" style="background-color:#ccc;">
<h2>For Accountable Inventory</h2>
<ul>
</div>
<div class="column" style="background-color:#ddd;">
<h2>For JI Requirements</h2>
<ul>
</ul>
</div>
</div>
</body>
</html>
</div>
<!-- This is What to Know-->
<div id="Madrid" class="tabcontent">
<style>
* {
box-sizing: border-box;
}
/* Create four equal columns that floats next to each other */
.column {
float: left;
width: 25%;
padding: 10px;
height: 300px; /* Should be removed. Only for demonstration */
}
/* Clear floats after the columns */
.row:after {
content: "";
display: table;
clear: both;
}
</style>
<body>
<div class="row">
<div class="column" style="background-color:#aaa;">
<h2>Cases</h2>
<ul>
</ul>
</div>
<div class="column" style="background-color:#bbb;">
<h2>Inventory</h2>
<ul>
</ul>
</div>
<div class="column" style="background-color:#ccc;">
<h2>JI Requirements</h2>
</div>
</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>
Lösung
It's because a button
's default behavior is to submit a form, and if you are working in a CEWP on a web part page, that ends up being inside a form
element on the page, so your button clicks attempt to submit the form, which causes a postback to the server.
You can fix it by adding an attribute type="button"
to your buttons, i.e.:
<button class="tablinks" type="button" onclick="openCity(event, 'London')">New User's
Guide</button>
Read more about the possible values for the type
attribute and what they do here.