Ngôn ngữ HTML - Thẻ select (combobox)

ĐỊNH NGHĨA COMBO BOX TRONG HTML

Dùng để tạo danh sách xổ xuống cho phép người dùng lựa chọn

Cú pháp:

<select name = "name">

[<optgroup label = "label">]

<option [selected] value = "value">Text</option>

.......

[</optgroup>]

<option [selected] value = "value">Text</option>

.......

</select>

Ví dụ: Tạo trang web có combobox

<select name="browser">

    <optgroup label="Firefox">
      <option value="2.0 or higher">
        Firefox 2.0 or higher
      </option>
      <option value="1.5.x">Firefox 1.5.x</option>
      <option value="1.0.x">Firefox 1.0.x</option>
    </optgroup>

    <optgroup label="Microsoft Internet Explorer">
      <option value="7.0 or higher">
        Microsoft Internet Explorer 7.0 or higher
      </option>
      <option value="6.x">Microsoft Internet Explorer 6.x</option>
      <option value="5.x">Microsoft Internet Explorer 5.x</option>
      <option value="4.x">Microsoft Internet Explorer 4.x</option>
    </optgroup>

    <optgroup label="Opera">
      <option value="9.0 or higher">Opera 9.0 or higher</option>
      <option value="8.x">Opera 8.x</option>
      <option value="7.x">Opera 7.x</option>
    </optgroup>

    <option>Safari</option>
    <option>Other</option>

</select>

Xem ví dụ