Palances Liao
Thomas Steiner
Die moderne Art
window.getScreenDetails() verwenden
Prüfen Sie zuerst, ob Ihr Browser die Methode getScreenDetails() unterstützt, ob sie im window-Objekt vorhanden ist. Rufen Sie dann window.getScreenDetails() auf, um die angehängten Bildschirme zu erhalten. Wenn Sie einen Ereignis-Listener zur Anpassung an geänderte Bildschirmdetails hinzufügen, können Sie mehrere Bildschirme entsprechend den Anforderungen Ihrer App verwalten.
if ('getScreenDetails' in window) {
// The Window Management API is supported.
const screenDetails = await window.getScreenDetails();
screenDetails.addEventListener('screenschange', (event) => {
// Handle screens change.
});
}
Klassisch
window.screen-Methode verwenden
Es gibt keine klassische Möglichkeit, Multiscreen-Layouts zu steuern, aber Sie können auf die Steuerung des aktuellen Bildschirms zurückgreifen, indem Sie die Eigenschaft window.screen verwenden und die neue API-Form mit Polyfill versehen.
if (!('getScreenDetails' in window)) {
// Returning a one-element array with the current screen,
// noting that there might be more.
window.getScreenDetails = async () => [window.screen];
// Set to `false`, noting that this might be a lie.
window.screen.isExtended = false;
}
Progressive Enhancement
Die folgende Demo zeigt, wie Sie mit der Window Management API mehrere Bildschirme bedienen können. Der Code überprüft zuerst die Browserfunktionen und greift dann auf die klassische Vorgehensweise zurück.
const detectButton = document.querySelector('#detectScreen');
const createButton = document.querySelector('#create');
const permissionLabel = document.querySelector('#permissionStatus');
const screensAvailLabel = document.querySelector('#screensAvail');
const popupUrl = './popup.html';
let screenDetails = undefined;
let permission = undefined;
let currentScreenLength = undefined;
detectButton.addEventListener('click', async () => {
if ('getScreenDetails' in window) {
screenDetails = await window.getScreenDetails();
screenDetails.addEventListener('screenschange', (event) => {
if (screenDetails.screens.length !== currentScreenLength) {
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
}
});
try {
permission =
(await navigator.permissions.query({ name: 'window-management' })).state === 'granted'
? 'Granted'
: 'No Permission';
} catch (err) {
console.error(err);
}
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
} else {
screenDetails = window.screen;
permission = 'Window Management API - NOT SUPPORTED';
currentScreenLength = 1;
updateScreenInfo();
}
});
createButton.addEventListener('click', () => {
let screen = screenDetails.screens[Math.floor(Math.random() * currentScreenLength)];
options = {
x: screen.availLeft,
y: screen.availTop,
width: screen.availWidth,
height: screen.availHeight,
};
window.open(popupUrl, '_blank', getFeaturesFromOptions(options));
});
function getFeaturesFromOptions(options) {
return (
'left=' +
options.x +
',top=' +
options.y +
',width=' +
options.width +
',height=' +
options.height
);
}
updateScreenInfo = () => {
screensAvailLabel.innerHTML = currentScreenLength;
permissionLabel.innerHTML = permission;
if ('getScreenDetails' in window && screenDetails.screens.length >= 1) {
createButton.disabled = false;
} else {
createButton.disabled = true;
}
};
Weitere Informationen
Demo
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="icon"
href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🎉</text></svg>"
/>
<title>How to use multiple screens</title>
<link rel="stylesheet" href="/style.css" />
<!-- TODO: Devsite - Removed inline handlers -->
<!-- <script src="/script.js" type="module"></script> -->
</head>
<body>
<h1>How to use multiple screens</h1>
<div>
<div>
Permission Status:
<span id="permissionStatus"></span>
</div>
<div>Screens Available: <span id="screensAvail"></span></div>
</div>
<button id="detectScreen">Detect Screens</button>
<button id="create" disabled>Create Page On Random Screen</button>
</body>
</html>CSS
:root {
color-scheme: dark light;
}
html {
box-sizing: border-box;
}
*,
*:before,
*:after {
box-sizing: inherit;
}
body {
margin: 1rem;
font-family: system-ui, sans-serif;
}
JS
const detectButton = document.querySelector('#detectScreen');
const createButton = document.querySelector('#create');
const permissionLabel = document.querySelector('#permissionStatus');
const screensAvailLabel = document.querySelector('#screensAvail');
const popupUrl = 'supporting-popup.html';
let screenDetails = undefined;
let permission = undefined;
let currentScreenLength = undefined;
detectButton.addEventListener('click', async () => {
if ('getScreenDetails' in window) {
screenDetails = await window.getScreenDetails();
screenDetails.addEventListener('screenschange', (event) => {
if (screenDetails.screens.length !== currentScreenLength) {
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
}
});
try {
permission =
(await navigator.permissions.query({ name: 'window-placement' }))
.state === 'granted'
? 'Granted'
: 'No Permission';
} catch (err) {
console.error(err);
}
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
} else {
screenDetails = window.screen;
permission = 'Multi-Screen Window Placement API - NOT SUPPORTED';
currentScreenLength = 1;
updateScreenInfo();
}
});
createButton.addEventListener('click', () => {
const screen =
screenDetails.screens[Math.floor(Math.random() * currentScreenLength)];
const options = {
x: screen.availLeft,
y: screen.availTop,
width: screen.availWidth,
height: screen.availHeight,
};
window.open(popupUrl, '_blank', getFeaturesFromOptions(options));
});
const getFeaturesFromOptions = (options) => {
return (
'left=' +
options.x +
',top=' +
options.y +
',width=' +
options.width +
',height=' +
options.height
);
};
const updateScreenInfo = () => {
screensAvailLabel.innerHTML = currentScreenLength;
permissionLabel.innerHTML = permission;
if ('getScreenDetails' in window && screenDetails.screens.length > 1) {
createButton.disabled = false;
} else {
createButton.disabled = true;
}
};