Frame.$$eval() method

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
args	Params	additional arguments to pass to pageFunction

Returns:

Promise<Awaited<ReturnType<Func>>>

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);