ElementHandle.$eval() method

This method runs document.querySelector 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:

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

Parameters

Parameter	Type	Description
selector	Selector
pageFunction	Func | string
args	Params

Returns:

Promise<Awaited<ReturnType<Func>>>

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');