HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>trigger submit</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; }
    #other { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </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">
    <button type="submit">Submit form</button>
  </form>
  <br>
  <button type="button" id="other">Trigger submit</button>
  <p id="hint">Click Trigger — same handler as Submit button.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#target").on("submit", function(event) {
      alert("Handler for submit called.");
      event.preventDefault();
    });
    $("#other").on("click", function() {
      $("#target").trigger("submit");
    });
  </script>
</body>
</html>

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jQuery submit event — #other triggers #target (Try It)