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collapser.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Show More Pagination</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description"
content="Collapsing and Expanding Content">
<link href="joy.css" rel="stylesheet">
<style>
.hide {
display: none;
}
sr-hint, .sr-only {
clip: rect(1px, 1px, 1px, 1px);
clip-path: inset(50%);
height: 1px;
width: 1px;
margin: -1px;
overflow: hidden;
padding: 0;
position: absolute;
}
</style>
</head>
<body>
<a href="./index.html">List of all Examples</a>
<h1>Collapsing and Expanding Content</h1>
This is an example to test a toggle which will collapse and expand its content.
<h2>A section expanded by default</h2>
<button is="toggle-button" aria-expanded="true" data-target="#section1" hidden>Toggle Section 1</button>
<section id="section1">
<p>This section would have some content which can be hidden from the screenreader.</p>
</section>
<h2>A section collapsed by default</h2>
<button is="toggle-button" data-target="#section2" hidden>Toggle Section 2</button>
<section id="section2">
<p>This section would have some content which can be hidden from the screenreader.</p>
</section>
<h2>Use the built-in details element (by default open)</h2>
<details open>
<summary>A built-in HTML</summary>
<p>Some content that can be hidden from the screenreader.</p>
</details>
<h2>Use the built-in details element</h2>
<details>
<summary>A built-in HTML</summary>
<p>Some content that can be hidden from the screenreader.</p>
</details>
<script>
if(this.customElements)
try{customElements.define('built-in',document.createElement('p').constructor,{'extends':'p'})}
catch(s){document.write('<script src="//unpkg.com/@ungap/custom-elements-builtin"><\x2fscript>')}
else
document.write('<script src="//unpkg.com/document-register-element"><\x2fscript>');
</script>
<script>
class ToggleButton extends HTMLButtonElement {
connectedCallback () {
this.removeAttribute("hidden");
if (this.getAttribute("aria-expanded") !== "true") {
this.setAttribute("aria-expanded", "false");
this.target.classList.add("hide");
}
this.addEventListener("click", this.toggle.bind(this));
}
toggle () {
let classList = this.target.classList;
if (classList.contains("hide")) {
classList.remove("hide");
this.setAttribute("aria-expanded", "true");
} else {
classList.add("hide");
this.setAttribute("aria-expanded", "false");
}
}
get target () {
return document.querySelector(this.getAttribute("data-target"))
}
}
customElements.define("toggle-button", ToggleButton, { extends: "button" });
</script>
</body>
</html>