To run page JavaScript before creating a PDF in PHP, use Chrome or Chromium controlled from PHP. A PHP PDF library’s setting for fetching remote images or CSS does not make that library execute JavaScript like a browser. Dompdf explicitly distinguishes its PDF-embedded JavaScript option from parsing page JavaScript. If the page can be rendered into static HTML first, a PHP PDF library may still fit; if its content or layout depends on scripts, use a browser engine.
Why enabling remote resources does not load page JavaScript
There are two different operations that are easy to confuse:
- Fetching remote resources: downloading items such as images and stylesheets referenced by HTML.
- Executing page JavaScript: running scripts in a browser-like environment so they can change the document before it is printed.
Dompdf’s isRemoteEnabled setting concerns web-based resources such as images and CSS. Its isJavascriptEnabled option concerns JavaScript embedded in the resulting PDF; it does not turn Dompdf into a browser that parses and runs the page’s scripts. Enabling either setting is therefore not a substitute for a JavaScript-capable renderer.
This distinction matters for pages that populate a chart after load, build a table from an API response, render a client-side application, or otherwise change after the initial HTML arrives. A renderer that only receives the initial markup may produce a PDF with missing or incomplete content even when it can fetch the page’s CSS and images.
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Choose the renderer based on what the PDF must contain
| Approach | JavaScript behavior | Best fit | Trade-offs |
|---|---|---|---|
| Dompdf | Does not parse page JavaScript as a browser. Its JavaScript option is for scripts embedded in the PDF. | HTML and CSS that are already complete without browser-side scripts. | Remote resources require the appropriate configuration and PHP support; CSS and layout support have limitations. Check the project documentation for the version in your application. |
| mPDF | Use it as a PHP HTML-to-PDF renderer, not as a browser for executing page scripts. | HTML/CSS prepared for an mPDF workflow. | The project manual describes the software as dated and says a template tailored to mPDF may be necessary. It recommends headless Chrome for modern CSS support or mirroring existing HTML pages. |
| Chrome or Chromium controlled from PHP | Runs page JavaScript in a browser engine; the chrome-php/chrome project documents adding a script tag by URL and producing a PDF. |
Pages whose content or appearance depends on scripts, or pages that need browser rendering. | Requires a Chrome or Chromium runtime as well as PHP-side browser control. You must choose suitable waits and account for browser resource use and security. |
The TCPDF project’s comparison page reports versions, licenses, and PHP requirements checked on 2026-08-31. Treat those details as a dated snapshot, not as timeless compatibility guidance.
Load a script URL and save a PDF with PHP-controlled Chrome
The chrome-php/chrome README documents creating a page, navigating to a URL or setting its HTML, adding a script tag using a URL, waiting for a response, and saving PDF output. The core documented calls for adding the script and saving the PDF are:
<?php
$page->addScriptTag([
'url' => 'https://example.com/script.js'
])->waitForResponse();
$page->pdf()->saveToFile('/path/output.pdf');This is the project’s documented API shape for those operations; it is not a complete standalone script because the page must first be created and loaded or populated with HTML. Use the project’s current setup and API documentation for browser creation, navigation, waiting, and cleanup. The README also lists Chrome or Chromium as a runtime requirement. Confirm the package’s current PHP and browser compatibility before deploying it.
Use the correct page before injecting the script
For an existing website, navigate the browser-controlled page to the URL you intend to print, then add the external script. For content you generate in PHP, set the page’s HTML first and add the script after that. The script URL must be reachable from the browser process, not merely from a developer’s workstation. If the script depends on other files or services, those requests also need to succeed in the deployment environment.
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Wait for the condition your page actually needs
Adding a script tag and receiving a response does not necessarily mean the page has finished all its work. The package documents load, interactive, and network-idle wait events. Its README describes network idle as no network activity for at least 500 ms. That is package guidance, not a guarantee that every asynchronous application is finished: a page may update later, poll a service, or keep network connections open.
Choose a wait based on the content. If the PDF requires a particular chart or table, wait for a selector that identifies that element where the package’s current API supports it. If completion depends on a known script response, wait for that response and then verify the page state. Use a delay only when you have a known timing reason; a fixed delay can be either wastefully long or too short.
Check remote access, browser access, and security
Remote resources in a PHP renderer
If the page is static and you use Dompdf, its usage documentation says web-based resources require isRemoteEnabled and PHP cURL or allow_url_fopen. That setting allows resource fetching; it does not execute page JavaScript. Keep the distinction clear when diagnosing missing content.
Remote scripts in Chrome or Chromium
With a browser engine, the script’s origin, network path, authentication requirements, and content-security policy can affect whether it loads. The cited package documentation does not guarantee behavior for every CDN, CSP, authentication flow, or dynamically updating page. Test the actual script and target site from the same environment that will generate production PDFs.
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Do not treat HTML-to-PDF input as harmless
Rendering can expose server resources to untrusted input. Dompdf warns that enabling embedded PHP for untrusted or user-supplied documents can run code with the renderer’s system access. The mPDF manual likewise warns against accepting outside-user HTML/CSS without rigorous vetting and sanitization. Restrict who can submit HTML, avoid enabling embedded PHP for untrusted documents, and apply appropriate isolation and network controls to the rendering process.
Troubleshoot missing or incomplete PDF content
| Symptom | Likely cause | What to check |
|---|---|---|
| The PDF omits content created by JavaScript. | A non-browser PHP renderer received the page before scripts populated it. | Use Chrome or Chromium for execution, or produce final static HTML before conversion. |
| Images or CSS are missing in Dompdf output. | Remote fetching is disabled, or PHP lacks the required cURL or allow_url_fopen support. |
Check isRemoteEnabled and the PHP runtime configuration. Remember this will not enable JavaScript execution. |
| The external script does not run. | The browser process cannot fetch the script, the URL is incorrect, or site policy/authentication blocks it. | Test reachability from the deployed browser environment and inspect the page’s actual load behavior and policy. |
| The PDF starts rendering before charts or data appear. | The chosen wait only establishes a navigation or network condition, not application completion. | Wait for a page-specific element or verified completion condition, then create the PDF. |
| The application works locally but fails after deployment. | Chrome/Chromium may be absent, incompatible, or unable to access required network resources in the server environment. | Verify the runtime installation, package compatibility, permissions, network access, and cleanup behavior on the deployment host. |
| Rendering user-provided HTML creates a security concern. | HTML, embedded PHP, scripts, or remote resource references may reach capabilities or systems they should not. | Vet and sanitize inputs, disable risky execution features, and isolate the rendering service with least privilege and appropriate network restrictions. |
Performance, reliability, and operating cost
Browser-based rendering gives you browser JavaScript behavior, but it also means operating a browser runtime alongside PHP. Plan for browser startup, page load, script execution, PDF generation, and cleanup in each job. The source documentation provides no benchmark or universal runtime figure, so measure the pages and deployment conditions that matter to your application rather than assuming a fixed completion time.
Reliability depends on the page as well as the renderer. External scripts, APIs, fonts, and images can fail or respond slowly; a network-idle condition may never occur if requests continue. Prefer an explicit application-ready condition when possible, give the job a bounded timeout, and record enough diagnostics to distinguish navigation failures from missing page content. For repeatable output, control the HTML, script version, viewport and page state used by the capture.
Resource use and security boundaries matter more when rendering many documents or accepting external URLs. Browser processes need appropriate memory and CPU headroom, and a renderer that can reach remote URLs should not be allowed to fetch arbitrary internal services. The cited documentation does not specify a universal hosting size or cost; evaluate those against your workload and isolation requirements.
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Frequently Asked Questions
Does Dompdf’s JavaScript option execute a remote page script before PDF creation?
No. Dompdf says that option does not make it parse page JavaScript like a web browser.
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The README describes network idle as no network activity for at least 500 ms; it is not proof that every application-specific asynchronous update is complete.
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