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

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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.

  • <!DOCTYPE html>
  • <html lang="en">
  • <head>
  • <meta charset="UTF-8">
  • <title>jQuery Set a DIV width</title>
  • <style type="text/css">
  •     .box{
  •         float: left;
  •         background: #f2f2f2;
  •         border: 1px solid #ccc;
  •     }
  • </style>
  • <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
  • <script type="text/javascript">
  • $(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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