HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.submit() trigger</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #10b981; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    #fire { 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>
  <form id="target" action="/demo" method="get">
    <label for="email">Email</label>
    <input type="text" id="email" name="email" value="user@example.com">
    <br><br>
    <button type="submit">Submit form</button>
  </form>
  <br>
  <button type="button" id="fire">Trigger via .submit()</button>
  <div id="out">Click Submit or Trigger button.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var count = 0;
    $("#target").submit(function(event) {
      count++;
      $("#out").text("Target submit handler fired (count: " + count + ")");
      event.preventDefault();
    });
    $("#fire").click(function() {
      $("#target").submit();
    });
  </script>
</body>
</html>

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