puppeteer/docs/api/puppeteer.elementhandle._eval.md

50 lines
1.9 KiB
Markdown
Raw Normal View History

2022-07-05 13:41:43 +00:00
---
sidebar_label: ElementHandle.$eval
---
# ElementHandle.$eval() method
Runs the given function on the first element matching the given selector in the current element.
2022-07-05 13:41:43 +00:00
If the given function returns a promise, then this method will wait till the promise resolves.
2022-07-05 13:41:43 +00:00
#### Signature:
2022-07-05 13:41:43 +00:00
```typescript
class ElementHandle {
$eval<
Selector extends string,
2022-07-05 13:41:43 +00:00
Params extends unknown[],
Func extends EvaluateFunc<
[ElementHandle<NodeFor<Selector>>, ...Params]
> = EvaluateFunc<[ElementHandle<NodeFor<Selector>>, ...Params]>
2022-07-05 13:41:43 +00:00
>(
selector: Selector,
pageFunction: Func | string,
...args: Params
): Promise<Awaited<ReturnType<Func>>>;
}
```
## Parameters
| Parameter | Type | Description |
| ------------ | -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------- |
| selector | Selector | The selector to query for. |
| pageFunction | Func \| string | The function to be evaluated in this element's page's context. The first element matching the selector will be passed in as the first argument. |
| args | Params | Additional arguments to pass to <code>pageFunction</code>. |
2022-07-05 13:41:43 +00:00
**Returns:**
Promise&lt;Awaited&lt;ReturnType&lt;Func&gt;&gt;&gt;
A promise to the result of the function.
2022-07-05 13:41:43 +00:00
## Example
```ts
const tweetHandle = await page.$('.tweet');
expect(await tweetHandle.$eval('.like', node => node.innerText)).toBe('100');
expect(await tweetHandle.$eval('.retweets', node => node.innerText)).toBe('10');
```