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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPut code that reads or renders a page inside the callback to page.open(url, callback), and check that its status is success first. That waits for PhantomJS’s page-load callback—not necessarily for later AJAX updates or other application rendering. If you need dynamic content, wait separately for the specific element or value your task depends on.
Wait for PhantomJS’s page-load callback
page.open() accepts a callback that runs when the page load finishes. The callback receives a status of success or fail. Read the DOM, capture a screenshot, or otherwise act on the loaded page inside that callback rather than immediately after starting the request. See the PhantomJS WebPage API documentation.
var page = require('webpage').create();
page.open('https://example.com', function (status) {
if (status !== 'success') {
console.log('Unable to load the page');
phantom.exit(1);
return;
}
console.log(page.title);
page.render('page.png');
phantom.exit();
});This follows PhantomJS’s documented quick-start pattern: check the result, render after a successful load, then exit. The PhantomJS quick-start guide also notes that the process needs an eventual phantom.exit() to terminate.
Why the callback matters
page.open() starts an asynchronous page load. Code on the next line can run before the requested page is ready. Calling phantom.exit() there can end the process before the callback or its work runs. Keep all work that depends on the page—and the exit that follows it—inside the callback.
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Handle a failed load
Do not treat the callback as success unconditionally. When the status is fail, avoid reading or rendering as if the requested page had loaded correctly. Log or otherwise report the failure and exit with a nonzero code if the script is being used in an automated workflow.
What “full page loaded” does and does not mean
The callback marks completion of the page-load process as PhantomJS reports it. It is a useful point for the initial document and its load process, but it is not a universal promise that a website has finished every later task. A single-page application may fetch results after load, render content in stages, or update a component asynchronously. PhantomJS’s documentation does not define one readiness event that applies to every site.
When a task needs late content, first decide what must actually be present: a result row, a heading, a non-empty field, or another observable output. Then wait for that condition with a deadline. This matches the page’s behavior better than assuming the initial load callback means all application work has ended.
Wait for a specific dynamic condition
For a page that adds a known element after load, poll for that element and proceed when it appears. Set a maximum wait so a missing element cannot leave the script running indefinitely.
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var page = require('webpage').create();
var deadlineMs = 10000;
var pollMs = 100;
page.open('https://example.com/results', function (status) {
if (status !== 'success') {
console.log('Unable to load the page');
phantom.exit(1);
return;
}
var startedAt = Date.now();
var timer = setInterval(function () {
var ready = page.evaluate(function () {
var result = document.querySelector('#results');
return result && result.textContent.trim().length > 0;
});
if (ready) {
clearInterval(timer);
console.log('Results are ready');
page.render('results.png');
phantom.exit();
return;
}
if (Date.now() - startedAt >= deadlineMs) {
clearInterval(timer);
console.log('Timed out waiting for results');
phantom.exit(1);
}
}, pollMs);
});Replace #results with a selector that identifies the content your script needs. The example’s deadline and polling interval are choices for this script, not PhantomJS-prescribed universal values. A timeout means the condition was not observed before the limit; it does not establish why the page failed to produce it.
Choose a condition that reflects usable content
- Element exists: suitable when the target is inserted only after the relevant work is done.
- Text is non-empty: useful when a placeholder element exists before its real content arrives.
- Specific state or value: prefer this when the page first displays loading text or a shell that would otherwise satisfy a simple existence check.
If the page can update the target repeatedly, refine the condition to represent the state you need rather than stopping at the first appearance.
Wait for an included script before using it
If the page task depends on a library added with page.includeJs, put that dependent work in the include callback. PhantomJS’s page automation documentation cautions that exiting outside this callback can end execution before the library has loaded.
page.open('https://example.com', function (status) {
if (status !== 'success') {
phantom.exit(1);
return;
}
page.includeJs('https://example.com/library.js', function () {
// Use the included library or run dependent page work here.
console.log('Included script loaded');
phantom.exit();
});
});Keep the success check for the page load separate from the completion callback for the included script: they represent different stages.
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Set a resource timeout before opening the page
Use page.settings.resourceTimeout to bound how long PhantomJS waits on a resource request. Its value is in milliseconds, and the setting must be configured before the initial page.open() call to affect that load. The WebPage API describes the setting and the onResourceTimeout callback in its settings documentation and resource-timeout handler documentation.
var page = require('webpage').create();
page.settings.resourceTimeout = 15000;
page.onResourceTimeout = function (request) {
console.log('Resource timed out: ' + request.url);
};
page.open('https://example.com', function (status) {
if (status !== 'success') {
console.log('Unable to load the page');
phantom.exit(1);
return;
}
page.render('page.png');
phantom.exit();
});Choose a limit that fits the resources and environment you expect. This setting bounds resource requests; it does not signal that application-specific content is ready. Changing it after opening the URL will not change the timeout behavior of that initial load.
Pick the right waiting strategy
| Strategy | What it tells you | Best fit | Main risk |
|---|---|---|---|
page.open() callback |
The page-load callback completed with a status to check. | Static pages or work dependent on the initial load. | Later application updates may not have finished. |
| Specific page condition | The particular element or state your script needs has appeared. | AJAX results or staged application rendering. | A wrong condition can be satisfied too early or never satisfied; use a deadline. |
| Fixed delay | The chosen amount of time has elapsed. | A bounded fallback when no observable condition is practical. | Short waits can proceed too early; long waits waste time. No single delay is right for every site. |
Prefer the load callback for initial page work and a page-specific condition for later content. A fixed delay can be a fallback, but it only guarantees elapsed time—not readiness.
Troubleshoot early captures and stalled scripts
The screenshot is blank or the DOM is incomplete
- Confirm that rendering or DOM inspection occurs inside the
page.open()callback. - Check that the callback status is
successbefore proceeding. - If the missing content is added after load, wait for a condition tied to that content instead of relying on the callback alone.
The process exits before work completes
Move phantom.exit() into the callback that completes the work. If an included script is involved, exit from its completion callback after using it. Exiting immediately after calling page.open() or page.includeJs() can terminate the process before the dependent code runs.
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Use a bounded wait around your condition, as in the polling example. If its deadline expires, log which condition was missing and exit or report a failure; do not silently treat the timeout as a successful capture.
A resource timeout setting seems ineffective
Set page.settings.resourceTimeout before page.open(). A setting changed after the initial load starts does not affect that load. Also distinguish a resource request timing out from an application condition not becoming true: the resource timeout does not replace the condition check.
A fixed sleep works sometimes but not reliably
A fixed delay depends on the page and the conditions under which it loads. Where possible, wait for the desired output. If you retain a delay as a fallback, bound it and do not interpret its completion as proof that the page is ready.
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If you need screenshots rather than a PhantomJS script, ScreenshotNeo offers a website screenshot API and MCP server. One GET request can return a PNG, JPEG, WebP, or PDF; its documented options include waiting for a selector, a delay, or network idle. The API parameters used by other screenshot APIs also work, which can make switching easier.
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- Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed. Responses identify the page verdict and billing status in headers.
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take_screenshot,get_page_info, andcapture_pdffor Claude, Cursor, and other MCP clients. - The Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 screenshots. Yearly billing gives two months free, and every feature is on every plan.
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Frequently Asked Questions
Does page.open() wait for AJAX content?
Not necessarily. Its callback marks page-load completion; for later AJAX content, wait for the specific output your task needs.
What status values does the page.open() callback receive?
PhantomJS documents success and fail; check the status before reading or rendering.
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Can I change resourceTimeout after opening the URL?
Not for that initial load. Configure it before calling page.open().
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