puppeteer/new-docs/puppeteer.elementhandle.__eval.md

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ElementHandle.$$eval() method

This method runs document.querySelectorAll within the element and passes it as the first argument to pageFunction. If there's no element matching selector, the method throws an error.

If pageFunction returns a Promise, then frame.$$eval would wait for the promise to resolve and return its value.

Signature:

$$eval<ReturnType>(selector: string, pageFunction: (elements: Element[], ...args: unknown[]) => ReturnType | Promise<ReturnType>, ...args: SerializableOrJSHandle[]): Promise<WrapElementHandle<ReturnType>>;

Parameters

Parameter	Type	Description
selector	string
pageFunction	(elements: Element[], ...args: unknown[]) => ReturnType | Promise<ReturnType>
args	SerializableOrJSHandle[]

Returns:

Promise<WrapElementHandle<ReturnType>>

Example 1

<div class="feed">
  <div class="tweet">Hello!</div>
  <div class="tweet">Hi!</div>
</div>

Example 2

const feedHandle = await page.$('.feed');
expect(await feedHandle.$$eval('.tweet', nodes => nodes.map(n => n.innerText)))
 .toEqual(['Hello!', 'Hi!']);