puppeteer/docs/api/puppeteer.frame.__eval.md

40 lines
1.2 KiB
Markdown
Raw Normal View History

---
sidebar_label: Frame.$$eval
---
# Frame.$$eval() method
**Signature:**
```typescript
class Frame {$$eval<Selector extends keyof HTMLElementTagNameMap, Params extends unknown[], Func extends EvaluateFunc<[
HTMLElementTagNameMap[Selector][],
...Params
]> = EvaluateFunc<[HTMLElementTagNameMap[Selector][], ...Params]>>(selector: Selector, pageFunction: Func | string, ...args: Params): Promise<Awaited<ReturnType<Func>>>;}
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| selector | Selector | the selector to query for |
| pageFunction | Func \| string | the function to be evaluated in the frame's context |
| args | Params | additional arguments to pass to <code>pageFunction</code> |
**Returns:**
Promise&lt;Awaited&lt;ReturnType&lt;Func&gt;&gt;&gt;
## Remarks
This method runs `Array.from(document.querySelectorAll(selector))` within the frame and passes it as the first argument to `pageFunction`.
If `pageFunction` returns a Promise, then `frame.$$eval` would wait for the promise to resolve and return its value.
## Example
```ts
const divsCounts = await frame.$$eval('div', divs => divs.length);
```