How TO - Add Active Class to Current Element
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How TO - Add Active Class to Current Element
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Learn how to add an active class to the current element with JavaScript.
Highlight the active/current (pressed) button:
// Add active class to the current button (highlight it)
var header = document.getElementById("myDIV");
var btns = header.getElementsByClassName("btn");
for (var i = 0; i < btns.length; i++)
btns[i].addEventListener("click", function()
var current = document.getElementsByClassName("activehr");
current[0].className = current[0].className.replace(" activehr", "");
this.className += " activehr";
);
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Active Element
Step 1) Add HTML:
Example
<div id="myDIV">
<button class="btn">1</button>
<button
class="btn active">2</button>
<button class="btn">3</button>
<button class="btn">4</button>
<button class="btn">5</button>
</div>Step 2) Add CSS:
Example
/* Style the buttons */
.btn
border: none;
outline:
none;
padding: 10px 16px;
background-color: #f1f1f1;
cursor: pointer;
/* Style the active class (and buttons on
mouse-over) */
.active, .btn:hover
background-color: #666;
color: white;
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Step 3) Add JavaScript:
Example
// Get the container element
var btnContainer = document.getElementById("myDIV");
// Get all buttons with class="btn" inside the container
var btns =
btnContainer.getElementsByClassName("btn");
// Loop through
the buttons and add the active class to the current/clicked button
for (var i = 0; i < btns.length;
i++)
btns[i].addEventListener("click", function()
var current = document.getElementsByClassName("active");
current[0].className = current[0].className.replace(" active", "");
this.className += " active";
);
Try it Yourself »
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