Frame.$$eval() method

Runs the given function on an array of elements matching the given selector in the frame.

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

Signature:

class Frame {
  $$eval<
    Selector extends string,
    Params extends unknown[],
    Func extends EvaluateFunc<
      [Array<NodeFor<Selector>>, ...Params]
    > = EvaluateFunc<[Array<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 the frame's context. An array of elements matching the given selector will be passed to the function as its 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 divsCounts = await frame.$$eval('div', divs => divs.length);