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April 15, 2022 07:02
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Demo of a keyboard trap.
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| <!doctype html> <title> Keyboard trap </title> | |
| <style> | |
| * { | |
| outline-offset: 2px; | |
| } | |
| input { | |
| X-border-radius: .2rem; | |
| font-size: medium; | |
| padding: .2rem .6rem; | |
| margin: 0 .3rem; | |
| } | |
| .im-trapped .trap input { | |
| X-display: inline-block; | |
| background: #fdd; | |
| border-color: red; | |
| outline: 5px solid red; | |
| } | |
| .trap:after { | |
| content: ' ✔️'; | |
| margin-right: 1rem; | |
| } | |
| .im-trapped .trap:after { | |
| color: #a00; | |
| content: ' ❌'; | |
| } | |
| input#count { | |
| background: #eee; | |
| border: 1px dotted #aaa; | |
| width: 3rem; | |
| text-align: center; | |
| } | |
| </style> | |
| <h1> Keyboard trap </h1> | |
| <p> Note: press the <q>Escape</q> key then <q>Tab</q> to escape the keyboard trap! | |
| <p><a href="#_before">Link before</a> | |
| <p><label class="trap"> I'm a trap! <input id="keyboard-trap" /></label> <label> Count: <input id="count" value="0" readonly /></label> | |
| <!-- <p><button id="keyboard-trap"> I'm a trap! </button> --> | |
| <p><a href="#_after">Link after</a> | |
| <script> | |
| const TRAP = document.querySelector('#keyboard-trap'); | |
| const COUNT = document.querySelector('#count'); | |
| let escape = false; | |
| TRAP.addEventListener('keydown', ev => { | |
| if (ev.key === 'Tab' && !escape) { | |
| escape = false; | |
| // Set the keyboard trap! | |
| ev.preventDefault(); | |
| document.body.classList.add('im-trapped'); | |
| // ev.target.classList.add('trapped'); | |
| ev.target.placeholder = 'Trapped!'; | |
| console.warn('TRAP!', 'Keydown event:', ev.key, ev); | |
| COUNT.value++; | |
| return; | |
| } | |
| escape = ev.key === 'Escape'; | |
| if (escape) { | |
| document.body.classList.remove('im-trapped'); | |
| // ev.target.classList.remove('trapped'); | |
| ev.target.placeholder = ''; | |
| } | |
| console.debug('Keydown event:', ev.key, ev); | |
| }); | |
| TRAP.addEventListener('blur', ev => console.debug('Blur event:', ev)); | |
| </script> | |
| <pre> | |
| NDF, 14-April-2022. | |
| </pre> |
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