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

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Frame.$$eval() method

Signature:

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

Parameters

Parameter	Type	Description
selector	string	the selector to query for
pageFunction	(elements: Element[], ...args: unknown[]) => ReturnType | Promise<ReturnType>	the function to be evaluated in the frame's context
args	SerializableOrJSHandle[]	additional arguments to pass to pageFuncton

Returns:

Promise<WrapElementHandle<ReturnType>>

Remarks

This method runs Array.from(document.querySelectorAll(selector)) within the frame and passes it as the first argument to pageFunction.

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

Example

const divsCounts = await frame.$$eval('div', divs => divs.length);