質問編集履歴
2
修正
title
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File without changes
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body
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@@ -15,7 +15,7 @@
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<div class="container">
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<main>
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<p>コンテンツの高さは
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<p>コンテンツの高さは5000</p>
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</main>
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<footer class="footer">
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<p>フッター</p>
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@@ -55,7 +55,7 @@
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opacity: 0;
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}
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main {
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height:
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height: 5000px;
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text-align: center;
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}
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.footer {
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1
tuiki
title
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body
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@@ -4,4 +4,96 @@
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4
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5
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それともこういう誤差は出るものなのでしょうか？
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-
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+
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HTML
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```
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<div class="page-top">
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<a href="#" class="page-top_link"></a>
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</div>
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<div class="container">
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<main>
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<p>コンテンツの高さは1200</p>
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</main>
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<footer class="footer">
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<p>フッター</p>
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</footer>
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</div>
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```
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CSS
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```
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.page-top {
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position: fixed;
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bottom: 20px;
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right: 20px;
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transition: 0.5s;
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}
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.page-top_link {
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position: relative;
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display: block;
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width: 45px;
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height: 45px;
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border-radius: 10px;
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background-color: #cccccc;
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}
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.page-top_link:before {
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content: "";
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display: block;
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position: absolute;
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top: 55%;
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left: 50%;
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transform: translate(-50%, -50%) rotate(45deg);
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width: 8px;
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height: 8px;
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border-top: 2px solid #fff;
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border-left: 2px solid #fff;
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}
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.is-hidden {
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visibility: hidden;
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55
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opacity: 0;
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}
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main {
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height: 1200px;
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text-align: center;
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}
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.footer {
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height: 100px;
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background-color: #ff5757;
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padding: 20px;
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color: #fff;
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text-align: center;
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}
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```
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70
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js
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```
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$(function() {
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var elem = $(".footer");
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var banner = $(".page-top");
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var elemO = elem.offset().top; // ページトップからの要素の高さを取得
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81
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var windowH = $(window).height(); // ウィンドウの高さを取得
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83
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84
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$(window).on("scroll", function() { // スクロールした値を取得
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85
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86
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var windowS = $(window).scrollTop(); // 現在の位置
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88
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89
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if(windowS > elemO - windowH + (windowH / 2) ){ // 要素が見えたら動く
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91
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banner.addClass("is-hidden");
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}else{
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banner.removeClass("is-hidden");
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}
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95
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96
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});
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97
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98
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});
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99
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+
```
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