HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>trigger resize</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    #trigger { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; margin-bottom: 12px; }
    #log { background: #eef2ff; padding: 10px; border-radius: 6px; color: #4338ca; font-weight: 600; min-height: 48px; }
  </style>
</head>
<body>
  <button type="button" id="trigger">Trigger resize handler</button>
  <div id="log">Click the button to call .trigger("resize").</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var count = 0;
    $(window).on("resize", function() {
      count++;
      $("#log").text("Handler for resize called " + count + " time(s). Width: " + $(window).width() + "px");
    });
    $("#trigger").on("click", function() {
      $(window).trigger("resize");
    });
  </script>
</body>
</html>

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jQuery resize event — trigger programmatically (Try It)