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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:
$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​

ParameterTypeDescription
selectorSelector
pageFunctionFunc | string
argsParams
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');