HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>set form val</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; color: #2563eb; }

    label { display: block; margin: 6px 0; }

    select { margin: 8px 0; padding: 4px; }

    button { margin-top: 12px; padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }

  </style>

</head>

<body>

  <select id="single">

    <option value="Single">Single</option>

    <option value="Single2">Single2</option>

  </select>

  <select id="multiple" multiple size="3">

    <option value="Multiple">Multiple</option>

    <option value="Multiple2">Multiple2</option>

    <option value="Multiple3">Multiple3</option>

  </select>

  <label><input type="checkbox" value="check1"> check1</label>

  <label><input type="checkbox" value="check2"> check2</label>

  <label><input type="radio" name="r" value="radio1"> radio1</label>

  <label><input type="radio" name="r" value="radio2"> radio2</label>

  <button type="button" id="apply">Apply official .val() sets</button>

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

  <script>

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

      $("#single").val("Single2");

      $("#multiple").val(["Multiple2", "Multiple3"]);

      $("input").val(["check1", "check2", "radio1"]);

    });

  </script>

</body>

</html>

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jQuery .val() — set form group (Try It)