48 lines
1.7 KiB
Markdown
48 lines
1.7 KiB
Markdown
---
|
|
sidebar_label: Frame.$eval
|
|
---
|
|
|
|
# Frame.$eval() method
|
|
|
|
Runs the given function on the first element matching the given selector in the frame.
|
|
|
|
If the given function returns a promise, then this method will wait till the promise resolves.
|
|
|
|
**Signature:**
|
|
|
|
```typescript
|
|
class Frame {
|
|
$eval<
|
|
Selector extends string,
|
|
Params extends unknown[],
|
|
Func extends EvaluateFunc<
|
|
[ElementHandle<NodeFor<Selector>>, ...Params]
|
|
> = EvaluateFunc<[ElementHandle<NodeFor<Selector>>, ...Params]>
|
|
>(
|
|
selector: Selector,
|
|
pageFunction: Func | string,
|
|
...args: Params
|
|
): Promise<Awaited<ReturnType<Func>>>;
|
|
}
|
|
```
|
|
|
|
## Parameters
|
|
|
|
| Parameter | Type | Description |
|
|
| ------------ | -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
|
|
| selector | Selector | The selector to query for. |
|
|
| pageFunction | Func \| string | The function to be evaluated in the frame's context. The first element matching the selector will be passed to the function as its first argument. |
|
|
| args | Params | Additional arguments to pass to <code>pageFunction</code>. |
|
|
|
|
**Returns:**
|
|
|
|
Promise<Awaited<ReturnType<Func>>>
|
|
|
|
A promise to the result of the function.
|
|
|
|
## Example
|
|
|
|
```ts
|
|
const searchValue = await frame.$eval('#search', el => el.value);
|
|
```
|