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⚠️ This is the archived documentation for k6 v0.45. Go to the latest version.

evaluate(pageFunction[, arg])

Returns the value of the pageFunction invocation.

ParameterTypeDefaultsDescription
pageFunction
function or stringFunction to be evaluated in the page context. This can also be a string.
arg
string''Optional argument to pass to pageFunction

Returns

TypeDescription
anyThe value of the pageFunction invocation.

Example

import { chromium } from 'k6/experimental/browser';
import { check } from 'k6/http';
export default async function () {
const browser = chromium.launch();
const page = browser.newPage();
await page.goto('https://test.k6.io/browser.php');
const dimensions = page.evaluate(() => {
const obj = {
width: document.documentElement.clientWidth,
height: document.documentElement.clientHeight,
deviceScaleFactor: window.devicePixelRatio
};
return obj;
});
check(dimensions, {
'width': d => d.width === 1280,
'height': d => d.height === 720,
'scale': d => d.deviceScaleFactor === 1,
});
}