puppeteer/new-docs/puppeteer.page._eval.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [Page](./puppeteer.page.md) &gt; [$eval](./puppeteer.page._eval.md)

## Page.$eval() method

This method runs `document.querySelector` within the page and passes the result as the first argument to the `pageFunction`<!-- -->.

<b>Signature:</b>

```typescript
$eval<ReturnType>(selector: string, pageFunction: (element: Element, ...args: unknown[]) => ReturnType | Promise<ReturnType>, ...args: SerializableOrJSHandle[]): Promise<WrapElementHandle<ReturnType>>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  selector | string | the [selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors) to query for |
|  pageFunction | (element: Element, ...args: unknown\[\]) =&gt; ReturnType \| Promise&lt;ReturnType&gt; | the function to be evaluated in the page context. Will be passed the result of <code>document.querySelector(selector)</code> as its first argument. |
|  args | [SerializableOrJSHandle](./puppeteer.serializableorjshandle.md)<!-- -->\[\] | any additional arguments to pass through to <code>pageFunction</code>. |

<b>Returns:</b>

Promise&lt;[WrapElementHandle](./puppeteer.wrapelementhandle.md)<!-- -->&lt;ReturnType&gt;&gt;

The result of calling `pageFunction`<!-- -->. If it returns an element it is wrapped in an [ElementHandle](./puppeteer.elementhandle.md)<!-- -->, else the raw value itself is returned.

## Remarks

If no element is found matching `selector`<!-- -->, the method will throw an error.

If `pageFunction` returns a promise `$eval` will wait for the promise to resolve and then return its value.

## Example 1


```
const searchValue = await page.$eval('#search', el => el.value);
const preloadHref = await page.$eval('link[rel=preload]', el => el.href);
const html = await page.$eval('.main-container', el => el.outerHTML);

```
If you are using TypeScript, you may have to provide an explicit type to the first argument of the `pageFunction`<!-- -->. By default it is typed as `Element`<!-- -->, but you may need to provide a more specific sub-type:

## Example 2


```
// if you don't provide HTMLInputElement here, TS will error
// as `value` is not on `Element`
const searchValue = await page.$eval('#search', (el: HTMLInputElement) => el.value);

```
The compiler should be able to infer the return type from the `pageFunction` you provide. If it is unable to, you can use the generic type to tell the compiler what return type you expect from `$eval`<!-- -->:

## Example 3


```
// The compiler can infer the return type in this case, but if it can't
// or if you want to be more explicit, provide it as the generic type.
const searchValue = await page.$eval<string>(
 '#search', (el: HTMLInputElement) => el.value
);

```