HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>triggerHandler submit validate demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 400px; }
    label { display: block; margin: 8px 0 4px; font-weight: 600; }
    input { width: 100%; padding: 8px; box-sizing: border-box; }
    button { margin-top: 12px; padding: 8px 16px; cursor: pointer; }
    #log { margin-top: 12px; color: #1d4ed8; font-weight: bold; min-height: 2em; }
  </style>
</head>
<body>
  <form id="signup" action="#" method="get">
    <label>Name <input type="text" name="name" value=""></label>
    <button type="button" id="test">triggerHandler("submit")</button>
  </form>
  <div id="log">Empty name → fail. Fill name → pass. Form never submits.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("form").on("submit", function() {
      var name = $("input[name='name']").val().trim();
      if (!name) return false;
      return true;
    });
    $("#test").on("click", function() {
      var ok = $("form").triggerHandler("submit");
      $("#log").text(ok === false ? "Validation failed (returned false)" : "Validation passed (returned " + ok + ")");
    });
  </script>
</body>
</html>

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jQuery form.triggerHandler('submit') — validation dry-run (Try It)