HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>hasData plugin guard</title>

  <style>

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

    #nav { background: #e0e7ff; padding: 10px; border-radius: 6px; }

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

    button { margin-top: 8px; padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }

  </style>

</head>

<body>

  <div id="nav">Tab nav (click Init twice)</div>

  <button type="button">Init tabs</button>

  <pre id="log">Waiting…</pre>

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

  <script>

    var log = [];

    function initTabs($root) {

      var el = $root[0];

      if (jQuery.hasData(el) && $root.data("tabs")) {

        log.push("Skipped — already initialized (hasData + data tabs)");

        return;

      }

      $root.data("tabs", { active: 0 });

      $root.on("click.tabs", function() { log.push("Tab clicked"); });

      log.push("Initialized tabs plugin");

    }

    $("button").on("click", function() {

      initTabs($("#nav"));

      $("#log").text(log.join("\n"));

    });

  </script>

</body>

</html>

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jQuery.hasData() — plugin guard (Try It)