puppeteer.elementhandle._eval.md

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ElementHandle.$eval

ElementHandle.$eval() method

Runs the given function on the first element matching the given selector in the current element.

If the given function returns a promise, then this method will wait till the promise resolves.

Signature:

class ElementHandle {
  $eval<
    Selector extends string,
    Params extends unknown[],
    Func extends EvaluateFunc<
      [ElementHandle<NodeFor<Selector>>, ...Params]
    > = EvaluateFunc<[ElementHandle<NodeFor<Selector>>, ...Params]>
  >(
    selector: Selector,
    pageFunction: Func | string,
    ...args: Params
  ): Promise<Awaited<ReturnType<Func>>>;
}

Parameters

Parameter	Type	Description
selector	Selector	The selector to query for.
pageFunction	Func | string	The function to be evaluated in this element's page's context. The first element matching the selector will be passed in as the first argument.
args	Params	Additional arguments to pass to pageFunction.

Returns:

Promise<Awaited<ReturnType<Func>>>

A promise to the result of the function.

Example

const tweetHandle = await page.$('.tweet');
expect(await tweetHandle.$eval('.like', node => node.innerText)).toBe('100');
expect(await tweetHandle.$eval('.retweets', node => node.innerText)).toBe('10');