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<div class="wrap">
<header id="header">
<a href="#link1">リンク1</a>
<a href="#link2">リンク2</a>
<a href="#link3">リンク3</a>
<a href="#link4">リンク4</a>
</header>
<div id="link1">
リンク1
</div>
<div id="link2">
リンク2
</div>
<div id="link3">
リンク3
</div>
<div id="link4">
リンク4
<br>
<br>
※ ここは下までスクロールしても届かないのでスクロール処理は中断される
</div>
</div>
.wrap{
margin: 16px;
padding-top: 16px;
}
header{
position: fixed;
top:0;
left: 0;
background: #507cad;
width: 100%;
padding: 8px 24px;
a{
color: #fff;
display: inline-block;
padding: 0 4px;
}
}
div:not(.wrap){
height: 100vh;
background: linear-gradient(135deg, #b9ddf5, #6380ac);
margin-bottom: 16px;
padding: 40px;
}
div#link4{
height: 64vh;
}
//ヘッダーの高さを取得
let headH = document.getElementById('header').offsetHeight;
document.body.style.marginTop = headH + "px"; //CSSの調整部分。
/**
* スムーススクロール実行関数
*/
let smoothScroll = (target, offset) => {
let toY;
let nowY = window.pageYOffset; //現在のスクロール値
const divisor = 8; //近づく割合(数値が大きいほどゆっくり近く)
const range = (divisor / 2) + 1; //どこまで近づけば処理を終了するか(無限ループにならないように divisor から算出)
//ターゲットの座標
const targetRect = target.getBoundingClientRect(); //ターゲットの座標取得
const targetY = targetRect.top + nowY - offset; //現在のスクロール値 & ヘッダーの高さを踏まえた座標
//スクロール終了まで繰り返す処理
(function () {
let thisFunc = arguments.callee; //自身を呼び出すために変数に代入
toY = nowY + Math.round((targetY - nowY) / divisor); //次に移動する場所(近く割合は除数による。)
window.scrollTo(0, toY); //スクロールさせる
nowY = toY; //nowY更新
if (document.body.clientHeight - window.innerHeight < toY) {
//最下部にスクロールしても対象まで届かない場合は下限までスクロールして強制終了
window.scrollTo(0, document.body.clientHeight);
return;
}
if (toY >= targetY + range || toY <= targetY - range) {
//+-rangeの範囲内へ近くまで繰り返す
window.setTimeout(thisFunc, 10);
} else {
//+-range の範囲内にくれば正確な値へ移動して終了。
window.scrollTo(0, targetY);
}
})();
};
/**
* アンカータグにクリックイベントを登録
*/
const smoothOffset = headH; //Fixされているヘッダーの高さ分スクロール先の座標をずらすために、変数に高さを入れておく
const links = document.querySelectorAll('a[href*="#"]'); //#がリンクに含まれているアンカータグを全て取得
for (let i = 0; i < links.length; i++) {
links[i].addEventListener('click', function (e) {
const href = e.currentTarget.getAttribute('href'); //href取得
const splitHref = href.split('#');
const targetID = splitHref[1];
const target = document.getElementById(targetID); //リンク先の要素(ターゲット)取得
if (target) {
smoothScroll(target, smoothOffset);
} else {
return true;
}
return false;
});
}
Also see: Tab Triggers