HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.focusin() trigger</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 400px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    #target { width: 100%; padding: 10px 12px; border: 2px solid #10b981; border-radius: 6px; font-size: 16px; box-sizing: border-box; }
    #fire { margin-top: 10px; padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #out { margin-top: 12px; color: #047857; font-weight: bold; }
  </style>
</head>
<body>
  <label for="target">Input field:</label>
  <input type="text" id="target" placeholder="Focus me first">
  <br>
  <button type="button" id="fire">Trigger focusin via .focusin()</button>
  <div id="out">Focus the input or click the button.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var count = 0;
    $("#target").focusin(function() {
      count++;
      $("#out").text("Target focusin handler fired (count: " + count + ")");
    });
    $("#fire").click(function() {
      $("#target").focusin();
    });
  </script>
</body>
</html>

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jQuery .focusin() — trigger focusin programmatically (Try It)