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Screenshots and PDFs

Ferret can capture screenshots and generate PDF documents from browser-backed pages. Both require the cdp driver.

Take a screenshot

Use web::html::screenshot to capture the visible page:

terminal 
ferret run -e 'let page = web::html::open("https://mockery.ferretlang.org", { driver: "cdp" })let data = web::html::screenshot(page)return data'

web::html::screenshot returns binary data (base64-encoded PNG). To save it to a file, use io::fs::write:

example.fql
read-only
let page = web::html::open("https://mockery.ferretlang.org", { driver: "cdp" }) let data = web::html::screenshot(page) io::fs::write("screenshot.png", data) return "saved"

Screenshot options

Pass options to control the output:

example.fql
read-only
let page = web::html::open("https://mockery.ferretlang.org", { driver: "cdp" }) let data = web::html::screenshot(page, { format: "jpeg", quality: 80, fullPage: true }) io::fs::write("full-page.jpg", data) return "saved"
Option Type Description
format string "png" (default) or "jpeg"
quality int JPEG quality, 0–100 (ignored for PNG)
fullPage bool Capture the full scrollable page, not just the viewport

Generate a PDF

Use web::html::pdf to produce a PDF document from the page:

example.fql
read-only
let page = web::html::open("https://mockery.ferretlang.org", { driver: "cdp" }) let data = web::html::pdf(page) io::fs::write("page.pdf", data) return "saved"

PDF options

example.fql
read-only
let page = web::html::open("https://mockery.ferretlang.org", { driver: "cdp" }) let data = web::html::pdf(page, { landscape: true, printBackground: true, paperWidth: 8.5, paperHeight: 11 }) io::fs::write("report.pdf", data) return "saved"
Option Type Description
landscape bool Landscape orientation
printBackground bool Include background graphics
paperWidth float Page width in inches
paperHeight float Page height in inches
marginTop, marginBottom, marginLeft, marginRight float Margins in inches

Wait before capturing

Dynamic pages may need time to render. Wait for the content to stabilize before capturing:

example.fql
read-only
let page = web::html::open("https://mockery.ferretlang.org", { driver: "cdp" }) waitfor exists query one ".fully-loaded" in page using css timeout 10s let data = web::html::screenshot(page, { fullPage: true }) io::fs::write("loaded.png", data) return "saved"

Capture multiple pages

Combine screenshots with pagination or navigation:

example.fql
read-only
let urls = [ "https://mockery.ferretlang.org", "https://mockery.ferretlang.org/scenarios/ecommerce/" ] return for url, i in urls let page = web::html::open(url, { driver: "cdp" }) let data = web::html::screenshot(page, { fullPage: true }) let filename = "screenshot-" + to_string(i) + ".png" io::fs::write(filename, data) return { url, filename }

Next steps

Guide Browser-driven pages Use a browser for JavaScript-rendered pages and dynamic content. Guide Interact with pages Click elements, fill forms, and trigger browser events. Browser runtime Browser Start and stop managed browser instances for browser-backed scripts. Learn Standard library Functions and types available to every Ferret script.