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<!-- 段落を作成 -->
<p class="glowAnime">テキストがほのかに光りながら出現します</p>
.glowAnime {
color: #fff;
background-color: #000;
}
.glowAnime span{
opacity: 0;
}
/*「glow_anime_on」をアニメーションで透過を0から1に変化させtext-shadowをつける*/
.glowAnime.glow span{
animation:glow_anime_on 1s ease-out forwards; }
@keyframes glow_anime_on{
0% { opacity:0; text-shadow: 0 0 0 #fff,0 0 0 #fff;}
50% { opacity:1;text-shadow: 0 0 10px #fff,0 0 15px #fff; }
100% { opacity:1; text-shadow: 0 0 0 #fff,0 0 0 #fff;}
}
// glowAnimeにglowというクラス名を付ける定義
function GlowAnimeControl() {
// すべてのglowAnimeクラスを持つ要素を取得
const elements = document.querySelectorAll('.glowAnime');
// ウィンドウの高さを取得(スクロール計算用)
const windowHeight = window.innerHeight;
// 各要素に対して処理を実行
elements.forEach(function (element) {
// 要素の上辺位置を取得して補正(ページ上部からの位置 - 50px)
const elemPos = element.getBoundingClientRect().top + window.pageYOffset - 50;
// 現在のスクロール位置を取得
const scroll = window.pageYOffset;
// スクロール位置が要素の表示位置を超えた場合
if (scroll >= elemPos - windowHeight) {
// glowクラスを追加してアニメーションを開始
element.classList.add("glow");
} else {
// glowクラスを削除してアニメーションをリセット
element.classList.remove("glow");
}
});
}
// 画面をスクロールをしたら動かしたい場合の記述
window.addEventListener('scroll', function () {
// スクロール時にGlowAnimeControlを実行
GlowAnimeControl();
});
// 画面が読み込まれたらすぐに動かしたい場合の記述
window.addEventListener('load', function () {
// glowAnimeクラスを持つすべての要素を取得
const elements = document.querySelectorAll('.glowAnime');
// 各要素に対して処理を実行
elements.forEach(function (element) {
// 要素のテキスト内容を取得
const text = element.textContent;
// スパンタグでラップしたテキストを格納する変数
let textbox = "";
// テキストを1文字ずつ処理
text.split('').forEach(function (t, i) {
if (t !== " ") { // 空白でない文字の場合
// アニメーションの遅延時間を計算
const delay = i < 10 ? `.${i}` : `${i / 10}`;
// スパンタグを作成し、遅延時間を設定
textbox += `<span style="animation-delay: ${delay}s;">${t}</span>`;
} else {
// 空白の場合はそのまま追加
textbox += t;
}
});
// 元の要素の内容を生成したHTMLに置き換える
element.innerHTML = textbox;
});
// アニメーション用の関数を呼び出して初期状態を設定
GlowAnimeControl();
});
Also see: Tab Triggers