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HTML

              
                <div id="year">
  <select>
    <option value="">西暦を選んで下さい</option>
  </select>
</div>

<div id="result"></div>

<div class="memo">
  <p>干支の順番が間違っているかも知れませんが、間違ってたら直して下さい。</p>
  <p>西暦フォームを自動で作っています。1950年から今年まで(今年は毎年自動更新されます)</p>
  <p>メイン部分は干支を計算して配列から取り出す処理と、書き出す処理からできています。</p>
</div>

              
            
!

CSS

              
                .memo {
  margin-top: 2em;
  border: 1px solid red;
  font-size: 14px;
}

.memo p {
  margin: 1.2em 1.4em;
}

              
            
!

JS

              
                //フォームを作成
//今年から遡って1950年まで
(function() {
  var now = new Date();
  var thisYear = now.getFullYear();
  var year;
  for (i = thisYear; i > 1949; i--) {
    year = "<option value=" + i + ">" + i + "年</option>";
    $("#year select").append(year);
  }
})(jQuery);

//干支を計算する
//入力値の余りを配列に対応させて返す
(function() {
  function getEto(inputYear) {
    var eto = ["さる", "とり", "いぬ", "いのしし", "ねずみ", "うし", "とら", "うさぎ", "たつ", "へび", "うま", "ひつじ"];
    var targetNum = inputYear % 12;
    return eto[targetNum];
  }

  $("#year select").on("change", function() {
    var op = $(this).val();
    if (op > 0) {
      var text = op + "年の干支は" + getEto(op) + "年です";
      $("#result").empty().append(text);
    }
  });

})(jQuery);

              
            
!
999px

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