Last active
May 20, 2021 03:27
-
-
Save jdanyow/ee059ba01681107fbab9e482141cf30a to your computer and use it in GitHub Desktop.
Custom element to ensure clamped elements are not focusable
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>GistRun</title> | |
| <style> | |
| * { | |
| box-sizing: border-box; | |
| } | |
| .line-clamp { | |
| overflow: hidden; | |
| display: -webkit-box; | |
| -webkit-box-orient: vertical; | |
| } | |
| .line-clamp a { | |
| white-space: nowrap; | |
| } | |
| .line-clamp-1 { | |
| -webkit-line-clamp: 1 !important; | |
| } | |
| .line-clamp-2 { | |
| -webkit-line-clamp: 2 !important; | |
| } | |
| .line-clamp-3 { | |
| -webkit-line-clamp: 3 !important; | |
| } | |
| [tabindex] { | |
| background-color: orange; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>Hello world!</h1> | |
| <script> | |
| class ClampedContentElement extends HTMLElement { | |
| debounceTimeout = 0; | |
| connectedCallback() { | |
| this.scheduleUpdate(); | |
| addEventListener('resize', this, { passive: true }); | |
| addEventListener('content-update', this, { passive: true }); // docs-ui fires this event after making updates to the page content | |
| } | |
| disconnectedCallback() { | |
| clearTimeout(this.debounceTimeout); | |
| removeEventListener('resize', this, { passive: true }); | |
| removeEventListener('content-update', this, { passive: true }); | |
| } | |
| handleEvent(event) { | |
| if (event.type === 'resize' || event.type === 'content-update') { | |
| this.scheduleUpdate(); | |
| } | |
| } | |
| scheduleUpdate() { | |
| clearTimeout(this.debounceTimeout); | |
| this.debounceTimeout = setTimeout(() => this.update(), 300); | |
| } | |
| update() { | |
| clearTimeout(this.debounceTimeout); | |
| for (const a of Array.from(this.querySelectorAll('a'))) { | |
| if (a.offsetTop >= this.offsetTop + this.clientHeight) { | |
| if (a === document.activeElement) { | |
| a.blur(); | |
| } | |
| a.setAttribute('tabindex', '-1'); | |
| } else { | |
| a.toggleAttribute('tabindex', false); | |
| } | |
| } | |
| } | |
| } | |
| customElements.define('clamped-content', ClampedContentElement); | |
| </script> | |
| <clamped-content class="line-clamp line-clamp-3"> | |
| <p><a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. </p> | |
| </clamped-content> | |
| <clamped-content class="line-clamp line-clamp-2"> | |
| <p><a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. </p> | |
| </clamped-content> | |
| <clamped-content class="line-clamp line-clamp-1"> | |
| <p><a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. <a href="#">Hello world</a>! Lorem ipsum sumit dolar. <a href="#">Old MacDonald had a farm</a>. On that farm he had a chicken. </p> | |
| </clamped-content> | |
| </body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| console.log('Hello World!'); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| /* todo: add styles */ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment