HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>hasData and events</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; }

    #btn { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }

    pre { background: #f1f5f9; padding: 12px; border-radius: 6px; font-size: 14px; }

    .row { margin: 8px 0; }

  </style>

</head>

<body>

  <button type="button" id="btn">Sample button</button>

  <div class="row">

    <button type="button" id="bind">Bind click</button>

    <button type="button" id="unbind">Unbind click</button>

    <button type="button" id="check">Check hasData</button>

  </div>

  <pre id="out">Bind or unbind, then check hasData.</pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    var el = $("#btn")[0],

        $btn = $("#btn");

    function handler() { alert("Clicked!"); }

    $("#bind").on("click", function() {

      $btn.on("click", handler);

      $("#out").text("Bound click. hasData → " + jQuery.hasData(el));

    });

    $("#unbind").on("click", function() {

      $btn.off("click", handler);

      $("#out").text("Unbound click. hasData → " + jQuery.hasData(el));

    });

    $("#check").on("click", function() {

      $("#out").text("Current hasData → " + jQuery.hasData(el));

    });

  </script>

</body>

</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

jQuery.hasData() — event handlers (Try It)