シュテル(@sterchannel2020)です！
入力フォームもいろいろ形式があるのでvalメソッドとの絡みを見ていきたいですね
ですね～今回はselectメソッドを見ていきましょう。
まずはselectタグをおさらいする
selectタグを使うと選択式のセレクトボックスを作れ、
selectタグにはさまれた各optionタグが選択肢となります。
select要素に対してvalメソッドを用いることで、
選択中の値(optionタグのvalue属性値)を取得できます。
フォームの入力有無でエラー文を動かす方法
「if文」を使って、フォームの入力有無によるエラー文の表示を切り替えをおこないます。
「中身の無い文字列」で判断する
「空文字列」と言い、「”」（シングルクォーテーション2つ）で表記します。
値が入力されているかどうかは、valメソッドで取得した値が
空文字列「”」かどうか
で判断します。
※また、textメソッドを使い、空文字列を指定要素に挿入することも可能です。
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