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How to set the width of a div element dynamically using jQuery

Topic: JavaScript / jQueryPrev|Next

Answer: Use the JavaScript width() method

You can set the width of a <div> box dynamically using the jQuery width() method.

The width() method simply returns the element's width as unit-less pixel value. However calling the width(value) method sets the width of the element, where the value can be either a string (e.g. 100%, 50px, 25em, auto etc.) or a number. If only a number is provided for the value, jQuery assumes it as a pixel unit. Let's check out an example to understand how it works:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery Set a DIV width</title>
<style>
    .box{
        float: left;
        background: #f2f2f2;
        border: 1px solid #ccc;
    }
</style>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>
$(document).ready(function(){
    $(".set-width-btn").click(function(){
        var newWidth = $(".input-width").val();
        $(".box").width(newWidth);
    });
});
</script>
</head> 
<body>
    <form>
        <input type="text" class="input-width">
        <button type="button" class="set-width-btn">Set Width</button>
        <p>Enter the value in input box either as number (e.g. 100, 200) or combination of number and unit (e.g. 100%, 200px, 50em, auto) and click the "Set Width" button.</p>
    </form>
    <br>
    <div class="box">This is simple DIV box</div>
</body>
</html>

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