puppeteer/docs/api/puppeteer.page._eval.md

---
sidebar_label: Page.$eval
---
# Page.$eval() method

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

**Signature:**

```typescript
class Page {$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](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors) to query for |
|  pageFunction | Func \| string | 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 | Params | any additional arguments to pass through to <code>pageFunction</code>. |

**Returns:**

Promise&lt;Awaited&lt;ReturnType&lt;Func&gt;&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


```ts
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


```ts
// 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


```ts
// 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
);
```