HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .width callback</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    .row { margin: 8px 0; height: 28px; background: #e2e8f0; border-radius: 4px; overflow: hidden; }

    .bar { height: 100%; background: #2563eb; width: 0; }

    button { margin-top: 12px; padding: 8px 14px; cursor: pointer; }

  </style>

</head>

<body>

  <div id="chart">

    <div class="row"><div class="bar"></div></div>

    <div class="row"><div class="bar"></div></div>

    <div class="row"><div class="bar"></div></div>

    <div class="row"><div class="bar"></div></div>

    <div class="row"><div class="bar"></div></div>

  </div>

  <button type="button" id="apply">Apply index-based widths</button>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#apply").on("click", function() {

      $(".bar").width(function(index) {

        return 40 + index * 45;

      });

    });

  </script>

</body>

</html>

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