---
title: "evaluate(pageFunction[, arg]) | Grafana k6 documentation"
description: "Browser module: locator.evaluate(pageFunction[, arg]) method"
---

# evaluate(pageFunction\[, arg])

Executes JavaScript code in the page, passing the matching element of the locator as the first argument to the `pageFunction` and `arg` as the following arguments. It returns the value of the `pageFunction` invocation.

Expand table

| Parameter    | Type               | Defaults | Description                                   |
|--------------|--------------------|----------|-----------------------------------------------|
| pageFunction | function or string |          | Function to be evaluated in the page context. |
| arg          | string             | `''`     | Optional argument to pass to `pageFunction`.  |

### Returns

Expand table

| Type    | Description                         |
|---------|-------------------------------------|
| Promise | The return value of `pageFunction`. |

### Example

JavaScript ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```javascript
import { browser } from 'k6/browser';
import { check } from 'https://jslib.k6.io/k6-utils/1.5.0/index.js';

export const options = {
  scenarios: {
    browser: {
      executor: 'shared-iterations',
      options: {
        browser: {
          type: 'chromium',
        },
      },
    },
  },
};

export default async function () {
  const page = await browser.newPage();

  try {
    await page.goto("https://quickpizza.grafana.com", { waitUntil: "load" });

    await page.getByText('Pizza, Please!').click();

    await check(page, {
      'pizza name': async p => {
        const n = await p.locator('#pizza-name').evaluate((pizzaName, extra) => pizzaName.textContent + extra, ' Super pizza!');
        return n == 'Our recommendation: Super pizza!';
      }
    });
  } finally {
    await page.close();
  }
}
```