HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>select eventData toolbar</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    #editor { padding: 12px; border: 2px dashed #94a3b8; border-radius: 8px; }
    textarea { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; min-height: 90px; }
    #toolbar { display: none; margin-top: 10px; padding: 8px 12px; background: #eef2ff; border-radius: 6px; color: #4338ca; font-size: 14px; font-weight: 600; }
  </style>
</head>
<body>
  <div id="editor">
    <textarea placeholder="Type and highlight text...">Format this sentence.</textarea>
  </div>
  <div id="toolbar"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#editor").on("select", { toolbar: "basic" }, "textarea", function(event) {
      var len = this.selectionEnd - this.selectionStart;
      if (len > 0) {
        $("#toolbar").text("Toolbar: " + event.data.toolbar + " | " + len + " chars highlighted").show();
      } else {
        $("#toolbar").hide();
      }
    });
  </script>
</body>
</html>

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jQuery select event — eventData format toolbar (Try It)