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<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>floating-item/smooth-scroll</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<header class="l-header" id="js-header">
<div class="l-inner">
<p>リンクを押すと対象のセクションへスムーススクロールします</p>
<nav class="p-header__nav">
<ul class="p-header__list" id="js-global-nav-list">
<li class="p-header__item"><a href="#section1">section1</a></li>
<li class="p-header__item"><a href="#section2">section2</a></li>
<li class="p-header__item"><a href="#section3">section3</a></li>
<li class="p-header__item"><a href="#section4">section4</a></li>
<li class="p-header__item"><a href="#section5">section5</a></li>
</ul>
</nav>
</div>
</header>
<main id="observerArea">
<section class="p-section1 l-section" id="section1">
<div class="l-inner">
<h2 class="p-section__title">セクション1</h2>
</div>
</section>
<section class="p-section2 l-section" id="section2">
<div class="l-inner">
<h2 class="p-section__title">セクション2</h2>
</div>
</section>
<section class="p-section3 l-section" id="section3">
<div class="l-inner">
<h2 class="p-section__title">セクション3</h2>
</div>
</section>
<section class="p-section4 l-section" id="section4">
<div class="l-inner">
<h2 class="p-section__title">セクション4</h2>
</div>
</section>
<section class="p-section5 l-section" id="section5">
<div class="l-inner">
<h2 class="p-section__title">セクション5</h2>
</div>
</section>
<a href="#" class="p-topup" id="topup">TOPへ戻る</a>
<script src="index.js"></script>
</main>
</body>
</html>
.l-header {
padding: 20px;
height: 100px;
text-align: center;
background-color: #333;
color: #FFF;
position: fixed;
top: 0;
left: 0;
right: 0;
}
.l-inner {
max-width: 1000px;
margin: 0 auto;
}
.p-header__nav {
margin-top: 10px;
}
.p-header__list {
display: flex;
justify-content: center;
}
.p-header__item {
font-size: 20px;
}
.p-section1 {
margin-top: 100px;
}
.p-header__item:not(:last-child) {
margin-right: 20px;
}
.p-header__item > a {
display: block;
padding: 10px;
transition: .3s;
}
.p-header__item > a:hover {
background-color: #FFF;
color: #333;
transition: .3s;
}
.l-section {
padding: 200px 0;
border-top: 1px solid #333;
text-align: center;
}
.p-section__title {
font-size: 20px;
}
.p-section2,
.p-section4 {
background-color: #E0E0E0;
}
.p-section5 {
border-bottom: 1px solid #333;
}
.p-topup {
display: inline-block;
background-color: #FFCCCC;
padding: 30px;
border-radius: 50px;
position: fixed;
bottom: 10px;
right: 20px;
opacity: 0;
transition: opacity .3s;
}
.p-topup.is-show {
transition: opacity .3s;
opacity: 1;
}
/* reset.css */
/*! destyle.css v2.0.2 | MIT License | https://github.com/nicolas-cusan/destyle.css */
/* Reset box-model and set borders */
/* ============================================ */
*,
::before,
::after {
box-sizing: border-box;
border-style: solid;
border-width: 0;
}
/* Document */
/* ============================================ */
/**
* 1. Correct the line height in all browsers.
* 2. Prevent adjustments of font size after orientation changes in iOS.
* 3. Remove gray overlay on links for iOS.
*/
html {
line-height: 1.15; /* 1 */
-webkit-text-size-adjust: 100%; /* 2 */
-webkit-tap-highlight-color: transparent; /* 3*/
}
/* Sections */
/* ============================================ */
/**
* Remove the margin in all browsers.
*/
body {
margin: 0;
}
/**
* Render the `main` element consistently in IE.
*/
main {
display: block;
}
/* Vertical rhythm */
/* ============================================ */
p,
table,
blockquote,
address,
pre,
iframe,
form,
figure,
dl {
margin: 0;
}
/* Headings */
/* ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
font-size: inherit;
line-height: inherit;
font-weight: inherit;
margin: 0;
}
/* Lists (enumeration) */
/* ============================================ */
ul,
ol {
margin: 0;
padding: 0;
list-style: none;
}
/* Lists (definition) */
/* ============================================ */
dt {
font-weight: bold;
}
dd {
margin-left: 0;
}
/* Grouping content */
/* ============================================ */
/**
* 1. Add the correct box sizing in Firefox.
* 2. Show the overflow in Edge and IE.
*/
hr {
box-sizing: content-box; /* 1 */
height: 0; /* 1 */
overflow: visible; /* 2 */
border-top-width: 1px;
margin: 0;
clear: both;
color: inherit;
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
pre {
font-family: monospace, monospace; /* 1 */
font-size: inherit; /* 2 */
}
address {
font-style: inherit;
}
/* Text-level semantics */
/* ============================================ */
/**
* Remove the gray background on active links in IE 10.
*/
a {
background-color: transparent;
text-decoration: none;
color: inherit;
}
/**
* 1. Remove the bottom border in Chrome 57-
* 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
*/
abbr[title] {
text-decoration: underline; /* 2 */
text-decoration: underline dotted; /* 2 */
}
/**
* Add the correct font weight in Chrome, Edge, and Safari.
*/
b,
strong {
font-weight: bolder;
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
code,
kbd,
samp {
font-family: monospace, monospace; /* 1 */
font-size: inherit; /* 2 */
}
/**
* Add the correct font size in all browsers.
*/
small {
font-size: 80%;
}
/**
* Prevent `sub` and `sup` elements from affecting the line height in
* all browsers.
*/
sub,
sup {
font-size: 75%;
line-height: 0;
position: relative;
vertical-align: baseline;
}
sub {
bottom: -0.25em;
}
sup {
top: -0.5em;
}
/* Embedded content */
/* ============================================ */
/**
* Prevent vertical alignment issues.
*/
img,
embed,
object,
iframe {
vertical-align: bottom;
}
/* Forms */
/* ============================================ */
/**
* Reset form fields to make them styleable
*/
button,
input,
optgroup,
select,
textarea {
-webkit-appearance: none;
appearance: none;
vertical-align: middle;
color: inherit;
font: inherit;
background: transparent;
padding: 0;
margin: 0;
outline: 0;
border-radius: 0;
text-align: inherit;
}
/**
* Reset radio and checkbox appearance to preserve their look in iOS.
*/
[type="checkbox"] {
-webkit-appearance: checkbox;
appearance: checkbox;
}
[type="radio"] {
-webkit-appearance: radio;
appearance: radio;
}
/**
* Show the overflow in IE.
* 1. Show the overflow in Edge.
*/
button,
input {
/* 1 */
overflow: visible;
}
/**
* Remove the inheritance of text transform in Edge, Firefox, and IE.
* 1. Remove the inheritance of text transform in Firefox.
*/
button,
select {
/* 1 */
text-transform: none;
}
/**
* Correct the inability to style clickable types in iOS and Safari.
*/
button,
[type="button"],
[type="reset"],
[type="submit"] {
cursor: pointer;
-webkit-appearance: none;
appearance: none;
}
button[disabled],
[type="button"][disabled],
[type="reset"][disabled],
[type="submit"][disabled] {
cursor: default;
}
/**
* Remove the inner border and padding in Firefox.
*/
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
border-style: none;
padding: 0;
}
/**
* Restore the focus styles unset by the previous rule.
*/
button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
outline: 1px dotted ButtonText;
}
/**
* Remove arrow in IE10 & IE11
*/
select::-ms-expand {
display: none;
}
/**
* Remove padding
*/
option {
padding: 0;
}
/**
* Reset to invisible
*/
fieldset {
margin: 0;
padding: 0;
min-width: 0;
}
/**
* 1. Correct the text wrapping in Edge and IE.
* 2. Correct the color inheritance from `fieldset` elements in IE.
* 3. Remove the padding so developers are not caught out when they zero out
* `fieldset` elements in all browsers.
*/
legend {
color: inherit; /* 2 */
display: table; /* 1 */
max-width: 100%; /* 1 */
padding: 0; /* 3 */
white-space: normal; /* 1 */
}
/**
* Add the correct vertical alignment in Chrome, Firefox, and Opera.
*/
progress {
vertical-align: baseline;
}
/**
* Remove the default vertical scrollbar in IE 10+.
*/
textarea {
overflow: auto;
}
/**
* Correct the cursor style of increment and decrement buttons in Chrome.
*/
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
height: auto;
}
/**
* 1. Correct the outline style in Safari.
*/
[type="search"] {
outline-offset: -2px; /* 1 */
}
/**
* Remove the inner padding in Chrome and Safari on macOS.
*/
[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}
/**
* 1. Correct the inability to style clickable types in iOS and Safari.
* 2. Change font properties to `inherit` in Safari.
*/
::-webkit-file-upload-button {
-webkit-appearance: button; /* 1 */
font: inherit; /* 2 */
}
/**
* Clickable labels
*/
label[for] {
cursor: pointer;
}
/* Interactive */
/* ============================================ */
/*
* Add the correct display in Edge, IE 10+, and Firefox.
*/
details {
display: block;
}
/*
* Add the correct display in all browsers.
*/
summary {
display: list-item;
}
/*
* Remove outline for editable content.
*/
[contenteditable] {
outline: none;
}
/* Table */
/* ============================================ */
table {
border-collapse: collapse;
border-spacing: 0;
}
caption {
text-align: left;
}
td,
th {
vertical-align: top;
padding: 0;
}
th {
text-align: left;
font-weight: bold;
}
/* Misc */
/* ============================================ */
/**
* Add the correct display in IE 10+.
*/
template {
display: none;
}
/**
* Add the correct display in IE 10.
*/
[hidden] {
display: none;
}
const globalNav = document.getElementById("js-global-nav-list");
globalNav.addEventListener("click", function (e) {
e.preventDefault();
const globalNavItem = e.target;
const headerHeight = document.getElementById("js-header").clientHeight;
const href = globalNavItem.getAttribute("href");
const sectionName = href.replace("#", "");
const sectionId = document.getElementById(sectionName);
const rect = sectionId.getBoundingClientRect().top;
const offset = window.pageYOffset;
const target = rect + offset - headerHeight;
window.scrollTo({
top: target,
behavior: "smooth"
});
});
const topUp = document.getElementById("topup");
topUp.addEventListener("click", function (e) {
e.preventDefault();
window.scrollTo({
top: 0,
behavior: "smooth"
});
});
const callback = (entries) => {
entries.forEach((entry) => {
if (entry.boundingClientRect.top < 0) {
topUp.classList.remove("is-show");
if (entry.isIntersecting) {
topUp.classList.remove("is-show");
} else {
topUp.classList.add("is-show");
}
}
});
};
const observer = new IntersectionObserver(callback);
observer.observe(document.getElementById("section2"));
Also see: Tab Triggers