';
html += '';
html += side === "front" ? "Front page " + pageNumber : "Back page " + pageNumber;
html += "
";
for (var i = 0; i < perPage; i++) {
var card = null;
if (side === "front") {
card = pageCards[i] || null;
} else {
card = pageCards[getBackIndex(i, columns)] || null;
}
html += buildCardCellHTML(card, 0, side, columns);
}
html += "";
return html;
}
function buildPrintHTML(cards, perPage, columns) {
var totalSheets = Math.ceil(cards.length / perPage);
var pagesHTML = "";
for (var p = 0; p < totalSheets; p++) {
var pageCards = cards.slice(p * perPage, (p + 1) * perPage);
pagesHTML += buildPrintPageHTML(pageCards, p + 1, "front", perPage, columns);
pagesHTML += buildPrintPageHTML(pageCards, p + 1, "back", perPage, columns);
}
return `
Knowt Flashcards - Printable Double-Sided Cards
Best option: Click "Print all duplex", then choose double-sided printing and "Flip on long edge" in your printer dialog.
Manual option: Print fronts only first. Put the paper back in the printer, then print backs only.
The back pages are mirrored left-to-right so the definitions line up with the matching terms after duplex printing.
Important print settings: Paper size A4, scale 100, margins none, pages per sheet 1, headers and footers off.
${cards.length} cards - ${totalSheets} sheet${totalSheets !== 1 ? "s" : ""} - 8 cards per sheet
${pagesHTML}
`;
}
function openPrintWindow(cards, w) {
if (w.closed) throw new Error("The print preview was closed. Please try again.");
var html = buildPrintHTML(cards, 8, 2);
w.document.open();
w.document.write(html);
w.document.close();
}
// ------------------------------------------------------------
// Button creation and persistence
// ------------------------------------------------------------
var ktButtonObserver = null;
var ktButtonInterval = null;
function resetButton(btn) {
btn.innerHTML = "Print Flashcards";
btn.disabled = false;
}
function createPrintButton() {
var btn = document.createElement("button");
btn.id = "kt-print-btn";
btn.type = "button";
btn.innerHTML = "Print Flashcards";
btn.addEventListener("click", async function () {
// Open during the click so popup blockers do not reject the async result.
var w = window.open("", "_blank", "width=1000,height=800");
if (!w) { alert("Please allow popups for Knowt, then try again."); return; }
w.document.body.textContent = "Collecting flashcards. Keep the Knowt page open and let it scroll automatically.";
btn.disabled = true;
try {
var cards = await collectAllCards(btn);
openPrintWindow(cards, w);
} catch (error) {
console.error("[Knowt Print]", error);
if (!w.closed) w.close();
alert("Error: " + error.message);
} finally { resetButton(btn); }
});
return btn;
}
function ensurePrintButton() {
if (!document.body) return;
var existing = document.getElementById("kt-print-btn");
if (existing && document.body.contains(existing)) {
return;
}
var btn = createPrintButton();
document.body.appendChild(btn);
log("Print button added or restored");
}
function init() {
log("Knowt Flashcard Print userscript v1.2.0 loaded");
ensurePrintButton();
if (!ktButtonObserver) {
ktButtonObserver = new MutationObserver(function () {
ensurePrintButton();
});
ktButtonObserver.observe(document.documentElement, {
childList: true,
subtree: true
});
}
if (!ktButtonInterval) {
ktButtonInterval = setInterval(function () {
ensurePrintButton();
}, 1000);
}
}
if (document.readyState === "complete" || document.readyState === "interactive") {
init();
} else {
window.addEventListener("DOMContentLoaded", init);
}
})();