回答編集履歴
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コメントからの追加回答です
test
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修正
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---
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jquery使える場合、これでどうでしょうか？
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```html
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<!doctype html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>sample</title>
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<link rel="stylesheet" href="ファイル名.css">
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<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.1.4.min.js"></script>
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</head>
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<body>
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<header>
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<h1>header</h1>
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</header>
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<main>
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<aside>
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<div class="inner">
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sidebar
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</div>
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</aside>
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<article>
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<div class="content">
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<section>
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section-1
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</section>
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<section>
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section-2
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</section>
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<section>
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section-3
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</section>
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<section>
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section-4
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</section>
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</div>
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</article>
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</main>
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<footer>
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footer
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</footer>
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<script>
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(function() {
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var asideHeight = $('aside').outerHeight();
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$(window).scroll(function() {
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var scroll = $(window).scrollTop();
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var footerTop = $('footer').offset().top;
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var windowHeight = $(window).height();
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if (scroll <= 50) {
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$('aside').css({
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top:50 - scroll,
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height:asideHeight + scroll
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});
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}
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if(scroll >= footerTop - windowHeight) {
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$('aside').css({height:windowHeight - scroll + footerTop - windowHeight});
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}
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})
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})();
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</script>
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</body>
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</html>
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```
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```css
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* {
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margin: 0;
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padding: 0;
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}
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html,body {
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height: 100%;
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}
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main {
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display: flex;
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}
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article {
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background: #afafaf;
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width: calc(100% - 250px);
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margin-left: 250px;
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}
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header {
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background: #00f;
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width: 100%;
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height: 50px;
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}
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section {
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border: 5px solid #000;
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height: 200px;
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margin-bottom: 10px;
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}
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aside {
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background: #f00;
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width: 250px;
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height: calc(100% - 50px);
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position: fixed;
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top: 50px;
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bottom: 50px;
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overflow-y: scroll;
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}
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.inner {
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background: #fff;
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height: calc(100% + 200px);
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margin: 50px 10px;
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}
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footer{
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background: #333;
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width: 100%;
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height: 50px;
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}
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```
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