jQueryプラグインも活用！ページ一番下まで自動スクロールの実装テクニック
2024-05-20
jQueryを使ってページの一番下までスクロールする方法
このチュートリアルでは、jQuery と jQuery-plugins を使って、ページの一番下までスクロールする方法を説明します。
方法1： scrollTop() と height() メソッドを使う
jQuery の scrollTop() メソッドと height() メソッドを使って、ページの一番下までスクロールすることができます。
$(document).ready(function() {
$("html, body").animate({ scrollTop: $(document).height() }, 1000);
});
このコードは、以下のような動作をします。
$(document).ready()関数は、DOM が完全にロードされたら実行されます。$("html, body")セレクタは、html要素とbody要素を選択します。animate()メソッドは、アニメーションを使って要素をスクロールします。{ scrollTop: $(document).height() }オプションは、scrollTopプロパティをdocumentオブジェクトのheightプロパティの値に設定します。これは、ページの一番下までスクロールすることを意味します。1000オプションは、アニメーションの時間をミリ秒単位で指定します。
例:
<!DOCTYPE html>
<html>
<head>
<title>jQuery Scroll To Bottom</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur quis leo nec quam ullamcorper hendrerit. Donec ullamcorper augue non enim gravida, et euismod quam tincidunt. Morbi ac laoreet ipsum. Maecenas nec enim eget tellus bibendum bibendum. Mauris sed ligula eget mi ultricies laoreet. Sed pulvinar lectus eu lacus semper, a sodales sem mollis. Praesent vel quam sit amet mi ullamcorper hendrerit. Donec nec diam ut tellus vestibulum hendrerit. Praesent ac metus ut tellus tincidunt ullamcorper. Nullam at libero nec purus varius ultrices. Suspendisse potenti. Maecenas id ligula euismod, porta eros sed, faucibus lectus. Sed at enim risus. Phasellus euismod elit in nunc tincidunt, sed tincidunt neque semper. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur quis leo nec quam ullamcorper hendrerit. Donec ullamcorper augue non enim gravida, et euismod quam tincidunt. Morbi ac laoreet ipsum. Maecenas nec enim eget tellus bibendum bibendum. Mauris sed ligula eget mi ultricies laoreet. Sed pulvinar lectus eu lacus semper, a sodales sem mollis. Praesent vel quam sit amet mi ullamcorper hendrerit. Donec nec diam ut tellus vestibulum hendrerit. Praesent ac metus ut tellus tincidunt ullamcorper. Nullam at libero nec purus varius ultrices. Suspendisse potenti. Maecenas id ligula euismod, porta eros sed, faucibus lectus. Sed at enim risus. Phasellus euismod elit in nunc tincidunt, sed tincidunt neque semper. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur quis leo nec quam ullamcorper hendrerit. Donec ullamcorper augue non enim gravida, et euismod quam tincidunt. Morbi ac laoreet ipsum. Maecenas nec enim eget tellus bibendum bibendum. Mauris sed ligula eget mi ultricies laoreet. Sed pulvinar lectus eu lacus semper, a sodales sem mollis. Praesent vel quam sit amet mi ullamcorper hendrerit. Donec nec diam ut
<!DOCTYPE html>
<html>
<head>
<title>jQuery Scroll To Bottom</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
$("#scrollToBottomButton").click(function() {
$("html, body").animate({ scrollTop: $(document).height() }, 1000);
});
});
</script>
</head>
<body>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur quis leo nec quam ullamcorper hendrerit. Donec ullamcorper augue non enim gravida, et euismod quam tincidunt. Morbi ac laoreet ipsum. Maecenas nec enim eget tellus bibendum bibendum. Mauris sed ligula eget mi ultricies laoreet. Sed pulvinar lectus eu lacus semper, a sodales sem mollis. Praesent vel quam sit amet mi ullamcorper hendrerit. Donec nec diam ut tellus vestibulum hendrerit. Praesent ac metus ut tellus tincidunt ullamcorper. Nullam at libero nec purus varius ultrices. Suspendisse potenti. Maecenas id ligula euismod, porta eros sed, faucibus lectus. Sed at enim risus. Phasellus euismod elit in nunc tincidunt, sed tincidunt neque semper. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur quis leo nec quam ullamcorper hendrerit. Donec ullamcorper augue non enim gravida, et euismod quam tincidunt. Morbi ac laoreet ipsum. Maecenas nec enim eget tellus bibendum bibendum. Mauris sed ligula eget mi ultricies laoreet. Sed pulvinar lectus eu lacus semper, a sodales sem mollis. Praesent vel quam sit amet mi ullamcorper hendrerit. Donec nec diam ut tellus vestibulum hendrerit. Praesent ac metus ut tellus tincidunt ullamcorper. Nullam at libero nec purus varius ultrices. Suspendisse potenti. Maecenas id ligula euismod, porta eros sed, faucibus lectus. Sed at enim risus. Phasellus euismod elit in nunc tincidunt, sed tincidunt neque semper. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur quis leo nec quam ullamcorper hendrerit. Donec ullamcorper augue non enim gravida, et euismod quam tincidunt. Morbi ac laoreet ipsum. Maecenas nec enim eget tellus bibendum bibendum. Mauris sed ligula eget mi ultricies laoreet. Sed pulvinar lectus eu lacus semper, a sodales sem mollis. Praesent vel quam sit amet mi ullamcorper hendrerit. Donec nec diam ut tellus vestibulum hendrerit. Praesent ac metus ut tellus tincidunt ullamcorper. Nullam at libero nec purus varius ultrices. Suspendisse potenti. Maecenas id ligula euismod, porta eros sed, faucibus lectus. Sed at enim risus. Phasellus euismod elit in nunc tincidunt, sed tincidunt neque semper. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
<button id="scrollToBottomButton">ページの一番下までスクロール</button>
</body>
</html>
$("#scrollToBottomButton").click(function() {...})関数は、#scrollToBottomButtonボタンがクリックされたときに実行されます。$("html, body").animate({ scrollTop: $(document).height() }, 1000);コード
jQueryを使ってページの一番下までスクロールする方法：その他の方法
方法2： $.scrollTo() メソッドを使う
jQuery には、$.scrollTo() メソッドという、要素をスムーズにスクロールするのに役立つメソッドがあります。
$(document).ready(function() {
$("#scrollToBottomButton").click(function() {
$.scrollTo({
target: $(document).height(),
top: 0,
speed: 1000
});
});
});
このコードは、方法1のコードとほぼ同じように動作しますが、$.scrollTo() メソッドを使用している点が異なります。このメソッドは、オプションオブジェクトを使用して、スクロールの速度やターゲット要素を指定することができます。
以下のコードは、$(window).scrollTop() と $(window).height() プロパティを使って、ページの一番下までスクロールします。
$(document).ready(function() {
$("#scrollToBottomButton").click(function() {
if ($(window).scrollTop() + $(window).height() < $(document).height()) {
$(window).scrollTop($(document).height() - $(window).height());
}
});
});
このコードは、まず現在のスクロール位置とウィンドウの高さを取得します。次に、現在のスクロール位置とウィンドウの高さがドキュメントの高さよりも小さいかどうかをチェックします。小さい場合は、ウィンドウをドキュメントの高さまでスクロールします。
方法4： Lazy Load プラグインを使う
Lazy Load プラグインは、ページビューを向上させるために役立つプラグインです。このプラグインは、ページの下部に近づいたときにのみ画像やその他のコンテンツをロードします。
Lazy Load プラグインを使用すると、ページの一番下までスクロールする必要がなくなります。ユーザーがページの下部に近づくと、コンテンツが自動的にロードされます。
<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///7v3////7v7v////7vv////7vvv////7vvvv////7vvvvv////7vvvvvv////7vvvvvvv///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA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