File size: 2,642 Bytes
f1dd159 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | export async function copyToClipboard(text: string): Promise<boolean> {
// The async Clipboard API is only reliable in a secure context. Some
// browsers still expose navigator.clipboard over plain HTTP but reject the
// write asynchronously; waiting for that rejection consumes the transient
// user activation and makes the legacy fallback fail as well.
if (globalThis.isSecureContext === true && navigator.clipboard?.writeText) {
try {
await navigator.clipboard.writeText(text);
return true;
} catch {
// The async Clipboard API can reject in a non-secure context (plain
// HTTP on a LAN IP) or when the document is not focused. Fall through to
// the synchronous execCommand fallback so copying still works there.
}
}
return legacyCopy(text);
}
// execCommand("copy") is deprecated but remains the standard way to copy
// programmatically when the async Clipboard API is unavailable.
function legacyCopy(text: string): boolean {
if (typeof document === "undefined" || !document.body) return false;
const textarea = document.createElement("textarea");
textarea.value = text;
textarea.setAttribute("readonly", "");
textarea.setAttribute("aria-hidden", "true");
textarea.style.position = "fixed";
textarea.style.top = "0";
textarea.style.left = "-9999px";
textarea.style.width = "1em";
textarea.style.height = "1em";
// A large font keeps iOS Safari from zooming the page and lets the
// selection persist on the programmatically created element.
textarea.style.fontSize = "2em";
textarea.style.padding = "0";
textarea.style.border = "none";
textarea.style.outline = "none";
textarea.style.boxShadow = "none";
textarea.style.background = "transparent";
textarea.style.opacity = "0";
textarea.style.pointerEvents = "none";
const activeElement = document.activeElement as Element | null;
const selection = document.getSelection();
let savedRange: Range | null = null;
if (selection && selection.rangeCount > 0) savedRange = selection.getRangeAt(0);
document.body.appendChild(textarea);
textarea.focus({ preventScroll: true });
textarea.select();
textarea.setSelectionRange(0, text.length);
let ok = false;
try {
ok = document.execCommand("copy");
} catch {
// execCommand may throw in restricted environments; ok stays false.
}
document.body.removeChild(textarea);
if (savedRange && selection) {
selection.removeAllRanges();
selection.addRange(savedRange);
}
if (activeElement instanceof HTMLElement && typeof activeElement.focus === "function") {
activeElement.focus();
}
return ok;
}
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