[Home](./index.md) > [puppeteer](./puppeteer.md) > [Page](./puppeteer.page.md) > [$eval](./puppeteer.page._eval.md)
## Page.$eval() method
This method runs `document.querySelector` within the page and passes the result as the first argument to the `pageFunction`.
Signature:
```typescript
$eval(selector: string, pageFunction: (element: Element, ...args: unknown[]) => ReturnType | Promise, ...args: SerializableOrJSHandle[]): Promise>;
```
## 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\[\]) => ReturnType \| Promise<ReturnType> | the function to be evaluated in the page context. Will be passed the result of document.querySelector(selector) as its first argument. |
| args | [SerializableOrJSHandle](./puppeteer.serializableorjshandle.md)\[\] | any additional arguments to pass through to pageFunction. |
Returns:
Promise<[WrapElementHandle](./puppeteer.wrapelementhandle.md)<ReturnType>>
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(
'#search', (el: HTMLInputElement) => el.value
);
```