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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWait for the Leaflet layer, not merely the page. Puppeteer’s networkidle2 navigation condition and its default font wait address different parts of rendering; neither confirms that the map’s visible tiles for the final center and zoom have loaded. Register Leaflet load and tileerror listeners before changing the view, verify isLoading() is false, then call page.pdf(). If the PDF is still truncated, inspect print CSS, fixed heights, overflow, page breaks, backgrounds and page ranges.
Why a PDF can finish before the map does
A successful page.goto() means navigation reached its chosen readiness condition. It does not mean application code has finished a pan, zoom, layer replacement or asynchronous tile draw. Puppeteer’s PDF guide demonstrates waitUntil: 'networkidle2' followed by page.pdf(), and states that PDF generation waits for fonts by default. Those guarantees are separate from Leaflet’s tile lifecycle.
Leaflet’s GridLayer emits loading, tileloadstart, tileload, tileerror and load. Its load event means all visible tiles for that grid layer have loaded; isLoading() reports whether any tile remains unfinished. Use the event for the exact final view rather than guessing with a sleep.
A reliable Puppeteer sequence
- Record the environment. Log Puppeteer, Chromium, Leaflet, operating-system or container, viewport and tile-provider configuration. Reproduce with the same values.
- Navigate separately from application readiness. Use
networkidle2if it helps initial navigation, but expose a page-level readiness promise for the map. - Attach listeners before the final map action. A listener installed after a pan or zoom can miss an event that already fired.
- Wait for every relevant layer. Repeat the wait after a later pan, zoom, resize or layer replacement that changes visible tiles.
- Generate the PDF only after readiness resolves. Keep a bounded timeout and include diagnostics in the timeout error.
Runnable example
const browser = await puppeteer.launch({headless: true});
const page = await browser.newPage();
await page.setViewport({ width: 1440, height: 900, deviceScaleFactor: 1 });
await page.goto('https://example.com/map', {
waitUntil: 'networkidle2',
timeout: 90000
});
// Install this before the code that sets the final center/zoom.
await page.evaluate(async () => {
const layer = window.myTileLayer; // expose the exact Leaflet layer on the page
if (!layer) throw new Error('myTileLayer is not available');
// The layer may already be idle, so do not wait for an event that has fired.
if (!layer.isLoading()) return;
await new Promise((resolve, reject) => {
let timer;
const errors = [];
const cleanup = () => {
clearTimeout(timer);
layer.off('load', onLoad);
layer.off('tileerror', onError);
};
const onLoad = () => {
if (!layer.isLoading()) { cleanup(); resolve(); }
};
const onError = event => {
errors.push(event && event.coords ? event.coords : event);
console.error('Leaflet tile error', event);
// Decide in your application whether an error is fatal.
};
timer = setTimeout(() => {
cleanup();
reject(new Error(`Leaflet tiles timed out; still loading=${layer.isLoading()}, errors=${errors.length}`));
}, 30000);
layer.on('load', onLoad);
layer.on('tileerror', onError);
});
});
await page.pdf({
path: 'map.pdf',
format: 'A4',
printBackground: true
});
await browser.close();The example assumes your page exposes window.myTileLayer. Adapt it to the real layer and to all layers that must appear in the document. Install the listeners before initiating the final view change; in production, wrap the center/zoom update and the wait in one page-level operation so the readiness promise describes that specific view.
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Waiting for a final pan or zoom
For an already-loaded map, call isLoading() first. For a new view, register the listeners, perform map.setView(...) or the equivalent action, then await load. A previous view’s load event is not evidence that the new visible tile set is complete.
Custom GridLayer implementations
If you extend Leaflet, your asynchronous createTile implementation must invoke Leaflet’s done callback when drawing or loading completes, including failure. Without that callback, Leaflet cannot know that work finished and its loading state can remain incorrect.
Print settings that make a complete map look incomplete
Print media versus screen media
page.pdf() uses print CSS media by default. That can intentionally hide controls, change dimensions or alter pagination. If the required output should match screen styles, call:
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await page.emulateMediaType('screen');Do this deliberately; screen media is not automatically more correct. Inspect @media print rules, @page size, fixed heights, overflow, hidden elements and page-break rules.
Backgrounds and colors
PDF backgrounds are disabled by default. Enable them when tile or map styling depends on CSS backgrounds:
await page.pdf({ printBackground: true });Printed colors may be adjusted. If exact CSS colors matter, use -webkit-print-color-adjust: exact in the relevant styles, while understanding that it affects the print rendering contract.
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Pages and ranges
A document that stops after page one can be a CSS layout problem rather than a tile race. Confirm that pageRanges is empty or unset when all pages are required. Check fixed-height map containers, ancestor overflow, accidental clipping, page-break declarations and content that is hidden only in print media.
Diagnosing blank, partial or hanging output
Blank map area
- Inspect
layer.isLoading()and capture console messages. - Listen for
tileerror; an HTTP failure, blocked request or provider limit may leave missing tiles. - Verify the map container has a non-zero size before calling
map.invalidateSize()and beginning the final view. - Check that the tile URL, custom headers, cookies and user agent work in the Chromium environment.
Intermittent missing tiles
Do not replace readiness with a fixed delay. A delay can hide a race on one machine and fail on a slower container. Use a timeout to prevent an endless job, log the number and coordinates of tile errors, and choose whether any error is fatal or whether a partial map is acceptable.
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A 2018 Puppeteer issue reported “single page, content lost” with Puppeteer 1.8.0 on Windows 10. It is a historical symptom, not evidence of a current universal defect. Reproduce on the deployed versions, then inspect print CSS, container heights, overflow, page breaks and pageRanges before changing browser versions.
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PDF generation hangs around fonts
A 2021 user issue described a font-related hang with Puppeteer 7.0.1 in specific macOS and Ubuntu/Heroku environments. Current Puppeteer options document font waiting, but that report does not establish a general cause. Log the deployed version, font requests and the exact timeout; test whether the page completes with the intended fonts available.
Handling tile failures safely
Leaflet can emit tileerror and later still emit load. Treat those as separate signals. If every tile is required, reject on an error and report the URL or coordinates. If a partial map is useful, retain the error list in job metadata and mark the PDF as partial rather than silently calling it complete. For multiple overlays, wait for each required layer independently; one layer’s load says nothing about another layer.
Performance, reliability and cost considerations
- Bound work: use navigation and tile timeouts so a provider outage cannot consume a worker forever.
- Control the viewport: larger dimensions and retina scale request more tiles and increase PDF memory use.
- Reuse Chromium carefully: browser reuse reduces startup overhead, but reset cookies, local storage and page state between jobs.
- Use caching consciously: a cached tile can complete quickly, while a cold request exposes real provider latency. Test both if reliability matters.
- Separate readiness logs: record navigation completion, final view change, first tile event, tile load, tile errors and PDF completion.
- Do not claim a failure rate: no attributable prevalence statistic establishes how often incomplete PDFs or missing Leaflet tiles occur.
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Frequently Asked Questions
Should I wait for `networkidle0` instead of `networkidle2`?
Neither navigation condition is a Leaflet readiness signal. Keep navigation waiting separate and wait for the final layer’s `load` event plus `isLoading() === false`.
Can a tile error be followed by a successful `load` event?
Yes. Record `tileerror` independently and decide whether your application should reject the PDF or label it partial.
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Why does my map differ in the PDF even though all tiles loaded?
PDF generation uses print media by default. Compare `@media print`, page dimensions, overflow, backgrounds and color adjustment before switching to screen media.
What does a custom Leaflet layer need to do?
Its asynchronous `createTile` function must call Leaflet’s `done` callback when the tile finishes drawing or fails.
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