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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Use PhantomJS’s webpage module: create a page, set viewportSize (and optionally clipRect), open the URL, wait for the page-specific content to be ready, call page.render(), and finish with phantom.exit(). The callback from page.open() is only the first readiness checkpoint; JavaScript widgets and late network requests may still be running.
A working PhantomJS runtime screenshot script
Save this as capture.js. It sets a reproducible viewport, checks the load status, waits briefly for late content, writes a PNG, and always terminates the PhantomJS process.
var webpage = require('webpage');
var page = webpage.create();
// Set these before page.open().
page.viewportSize = { width: 1024, height: 768 };
page.settings.javascriptEnabled = true;
page.settings.loadImages = true;
page.settings.resourceTimeout = 15000;
page.open('https://example.com', function (status) {
console.log('Status: ' + status);
if (status !== 'success') {
console.error('The page did not load. No screenshot was written.');
phantom.exit();
return;
}
// Give client-side code a bounded amount of extra time.
window.setTimeout(function () {
page.render('example.png');
console.log('Wrote example.png');
phantom.exit();
}, 1000);
});Run it with phantomjs capture.js. The file is rendered only after a successful page.open() callback and the one-second delay. Replace the URL and output filename with your own values.
What each operation does
require('webpage').create()creates an isolated page object.viewportSizecontrols the emulated browser viewport and responsive breakpoints.page.open()starts navigation and calls its callback with a status such assuccessorfail.page.render()serializes the current page into the selected file format.phantom.exit()ends the process; without it, a script can remain alive because of timers or open page activity.
Step-by-step procedure for a reliable capture
1. Set the viewport before navigation
Assign width and height before calling open(). Responsive sites choose their layout during initial loading, so changing dimensions afterward can produce a different breakpoint or require a second layout pass.
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page.viewportSize = {
width: 1366,
height: 900
};2. Add a rectangular crop when required
clipRect limits the rendered rectangle. Its coordinates are measured from the page’s top-left corner.
page.clipRect = {
top: 120,
left: 40,
width: 800,
height: 500
};Omit clipRect for a normal viewport screenshot. Keep the crop inside the viewport dimensions to avoid surprising empty areas.
3. Open the URL and inspect status
The callback status is the first failure boundary. Render only when it is success; otherwise log the failure and terminate so an automation job can detect that no valid image was produced.
4. Wait for the page’s actual readiness condition
A successful navigation means the initial document loaded, not that every asynchronous component finished. A short bounded delay is appropriate for a page whose behavior is predictable. For a dynamic application, poll for a selector that identifies the content you need.
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function waitForSelector(selector, deadline, done) {
var started = new Date().getTime();
function check() {
var found = page.evaluate(function (css) {
return !!document.querySelector(css);
}, selector);
if (found) {
done();
return;
}
if (new Date().getTime() - started >= deadline) {
console.error('Timed out waiting for ' + selector);
done();
return;
}
window.setTimeout(check, 100);
}
check();
}
page.open('https://example.com/app', function (status) {
if (status !== 'success') {
phantom.exit();
return;
}
waitForSelector('#dashboard', 10000, function () {
page.render('dashboard.png');
phantom.exit();
});
});Use a selector that appears only when the useful content exists, not a generic container that is present in the initial HTML. Always keep a deadline so a broken widget cannot hold the process indefinitely.
5. Render and exit after rendering
Call page.render() inside the final readiness callback. Do not call phantom.exit() before that call; doing so can terminate the process before the file is created.
Viewport, clipping and long pages
PhantomJS does not choose a project-specific viewport for you. Set both dimensions explicitly when pixel-for-pixel repeatability matters. A viewport screenshot captures the visible page area; clipRect narrows it to a coordinate rectangle.
Calculating a tall page before rendering
For a long document, you can measure the rendered document and then enlarge the viewport before calling render(). This is useful for a simple full-page image, but very tall pages consume more memory and can exceed practical image dimensions.
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page.open('https://example.com/article', function (status) {
if (status !== 'success') {
phantom.exit();
return;
}
var size = page.evaluate(function () {
var body = document.body;
var root = document.documentElement;
return {
width: Math.max(body.scrollWidth, root.scrollWidth),
height: Math.max(body.scrollHeight, root.scrollHeight)
};
});
page.viewportSize = {
width: Math.max(1024, size.width),
height: size.height
};
page.render('article.png');
phantom.exit();
});Pages that continuously append content, use sticky elements, or depend on viewport height may not produce a meaningful single full-page frame. In those cases, capture defined sections with separate clipRect values.
Output formats and image quality
page.render(filename[, options]) normally infers the format from the filename extension. PhantomJS supports PDF, PNG, JPEG, BMP, PPM and GIF when the Qt build includes GIF support.
| Format | Typical use | Quality behavior |
|---|---|---|
| PNG | UI documentation, diagrams and lossless screenshots | The quality value changes Deflate compression, not rendered pixels. |
| JPEG | Photographic pages and smaller files | The quality value changes compression and visible artifacts. |
| Printable or document-oriented output | Use the PDF renderer and validate page breaks on the target document. | |
| BMP, PPM | Interchange with tools that require these raster formats | Format-specific file size and compatibility apply. |
| GIF | Only when supported by the installed Qt build | Availability depends on that build. |
JPEG and PNG quality settings accept integers from 0 to 100. For example:
page.render('preview.jpg', {
format: 'jpg',
quality: 85
});Use an explicit format when a pipeline generates filenames dynamically. Otherwise, choose an extension that matches the bytes you expect.
Settings that affect fidelity and load behavior
Configure page settings before page.open(); the initial navigation uses the values that are in effect at that time.
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| Setting | Effect | Practical choice |
|---|---|---|
javascriptEnabled |
Allows scripts that build or modify the page. | Leave enabled for modern client-rendered sites; disable only for a deliberate static-HTML capture. |
loadImages |
Controls image loading. | Keep enabled when visual fidelity matters; disabling it speeds some captures but leaves placeholders. |
userAgent |
Sends a chosen browser identity. | Set it before navigation when the site serves materially different markup by user agent. |
resourceTimeout |
Bounds how long a resource may take. | Choose a finite value so one stalled request cannot block a batch indefinitely. |
These settings do not make an incompatible site compatible. PhantomJS’s browser engine is old, so current JavaScript syntax, CSS features or browser APIs may fail even when the network request succeeds.
Using CasperJS selectors with PhantomJS
If your project already uses CasperJS, its capture API provides higher-level helpers: viewport(width, height) sets the viewport, capture(targetFilepath, clipRect, imgOptions) accepts an explicit rectangle, and captureSelector(targetFile, selector, imgOptions) captures the area containing a CSS selector. These helpers still depend on the PhantomJS engine and its compatibility limits.
Troubleshooting common failures
| Symptom | Likely cause | Fix |
|---|---|---|
| A blank or partially populated image | Rendering occurred immediately after open(), before asynchronous content finished. |
Wait for a page-specific selector or use a bounded delay, then render. |
Status is not success |
DNS, TLS, redirect, server or network failure. | Log the status, verify the URL from the same machine, and terminate without treating the file as valid. |
| Images are missing | loadImages is disabled, image requests timed out, or the page requires browser features PhantomJS lacks. |
Enable image loading, increase the resource timeout carefully, and inspect whether the asset URL works in the target environment. |
| Layout uses the wrong breakpoint | The viewport was left at an implicit size or changed after navigation. | Assign viewportSize before open() and keep it fixed for the capture. |
| The script never finishes | A timer, open request or polling loop remains active. | Use a deadline in readiness polling and call phantom.exit() on every success and failure path. |
| A crop is offset or empty | clipRect coordinates do not match the viewport or the page moved after measurement. |
Measure after layout is ready, use top-left page coordinates, and keep the rectangle within the chosen viewport. |
| Modern site scripts throw errors | PhantomJS’s engine does not implement required JavaScript or CSS features. | Confirm compatibility with a minimal capture; if the site requires a current browser engine, use a maintained renderer instead. |
| Output format is unexpected | The filename extension and explicit format disagree, or the build lacks a format. | Use a matching extension and explicit format, then verify the generated file with an image or PDF inspector. |
Performance and reliability practices
- Reuse a clear, deterministic viewport across a batch so responsive layout does not vary between files.
- Prefer a selector-based readiness check to an unnecessarily long fixed sleep; keep a maximum deadline for both.
- Set
resourceTimeoutto a finite value and record the URL, status and elapsed time for each capture. - Capture only the required rectangle when a full viewport is not needed; large surfaces increase encoding time and memory use.
- Separate navigation failure from rendering failure in your job logs. A file left on disk is not proof that the page was ready.
- Test representative pages that use authentication, redirects, third-party widgets and lazy loading before committing to a production workflow.
PhantomJS maintenance status
The PhantomJS project homepage says, “Important: PhantomJS development is suspended until further notice.” Treat it as legacy infrastructure: it can still be useful for an existing, compatible capture job, but verify every target site and pin the runtime in automation. For new systems, compare maintenance status, modern JavaScript and CSS support, viewport and element capture behavior, output formats, startup cost and authentication requirements before standardizing on it.
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Frequently Asked Questions
What viewport does PhantomJS use if I do not set one?
CasperJS documentation notes that PhantomJS ships with a 400×300 default viewport and does not override it by default. Set page.viewportSize explicitly whenever dimensions matter.
Can I save a PDF instead of an image?
Yes. Pass a filename ending in .pdf to page.render(), or provide an explicit PDF format in the options object, then verify page breaks for the document you are capturing.
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