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Use element.evaluate(fn) when you already have a Puppeteer ElementHandle: Puppeteer passes that element to your callback, which runs in the page. For example, await element.evaluate(el => el.textContent) reads its text. Use $eval or $$eval when you want to find descendants and evaluate them in one step.
Evaluate JavaScript on an existing element
Select the element, check that it exists, then call its evaluate method. The callback runs in the browser page context, and the handle is supplied as its first argument.
const element = await page.$('h1');
if (!element) throw new Error('Heading not found');
try {
const text = await element.evaluate(el => el.textContent);
console.log(text);
} finally {
await element.dispose();
}page.$ returns null if the selector matches nothing. Explicitly dispose of a handle when you have finished with it; this example uses finally so disposal still happens if evaluation fails.
Choose the evaluation method for the task
| Need | Method | What it does |
|---|---|---|
| Evaluate using an element you already selected | element.evaluate(fn) |
Passes the handle’s element as the callback’s first argument. |
| Run page-context code with an existing handle | page.evaluate(fn, element) |
Passes the handle to the page-level callback. |
| Evaluate against one matching descendant | element.$eval(selector, fn) |
Searches within the element and passes the first match to the callback. |
| Evaluate against all matching descendants | element.$$eval(selector, fn) |
Searches within the element and passes an array of matches to the callback. |
| Find a page-level match and evaluate it | page.$eval(selector, fn) |
Passes the first page-level match to the callback; throws if there is no match. |
| Select and interact with an element | page.locator(selector) |
Recommended in Puppeteer’s current guide for ordinary interaction, with waiting for the element and appropriate state. |
Pass an existing handle to page.evaluate
This is an alternative when you want the computation expressed as a page-level evaluation. A handle is a valid evaluation argument:
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const element = await page.$('h1');
if (!element) throw new Error('Heading not found');
try {
const text = await page.evaluate(el => el.textContent, element);
console.log(text);
} finally {
await element.dispose();
}Evaluate on descendants
Use $eval and $$eval on an element handle to keep the selector scoped to that element. The following returns trimmed text for every descendant matching .title:
const titles = await section.$$eval('.title', nodes =>
nodes.map(node => node.textContent?.trim() ?? '')
);Use element.$eval('.title', fn) instead when you need just the first matching descendant. The equivalent page-level page.$eval(selector, fn) searches the page, not a particular handle’s descendants.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
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What runs in the page and what comes back
Evaluation callbacks run in the browser’s page context, not in the surrounding Node.js scope. Variables from your Node.js code are not automatically captured. Pass values the callback needs as explicit arguments:
const label = 'h1';
const headingText = await page.evaluate(selector => {
return document.querySelector(selector)?.textContent ?? null;
}, label);The callback’s result is returned to Node.js as a promise. If the callback itself returns a promise, Puppeteer waits for it to resolve. For ordinary data such as strings, numbers, arrays, and plain objects, evaluate is usually the straightforward choice.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
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Use a handle when you need a page object reference
If later code needs to keep working with an in-page object rather than receive its value, use evaluateHandle. page.evaluateHandle returns a handle; when the page function returns an element reference, that can be an ElementHandle. A handle retains its referenced object until it is disposed, the frame navigates away, or the execution context is destroyed. Dispose handles you explicitly acquire once you no longer need them.
Common errors and fixes
- No element matched: Check the selector and whether the element has appeared.
page.$returnsnull;$evalthrows when there is no match. Add an appropriate wait before selecting when the page has not loaded the target yet. - Evaluation targets the wrong scope:
page.evaluatedoes not automatically use a selected element. Pass the handle as an argument, callevaluateon the handle, or use the handle’s$eval/$$evalmethods to search within it. - The callback cannot see a Node.js variable: Page-context callbacks do not close over Node.js variables. Pass required values after the callback as evaluation arguments.
- The result is not usable in Node.js: Return serializable data for normal application logic. If you need to continue manipulating a browser-side object, return a handle with
evaluateHandleinstead. - Handles accumulate: Call
dispose()on explicitly acquired handles when finished. Navigation or destruction of the execution context also disposes them, but explicit cleanup makes ownership clear. - Evaluation is being used for a normal click or fill: Prefer
page.locator(selector)for ordinary selection and interaction. Use evaluation for custom reads or computations in the page.
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Rank #4
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- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
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- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
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