how to scroll to top puputter code example

Example 1: puppeteer scrolling down

const puppeteer = require('puppeteer');

(async () => {
    const browser = await puppeteer.launch({
        headless: false
    });
    const page = await browser.newPage();
    await page.goto('https://www.yoursite.com');
    await page.setViewport({
        width: 1200,
        height: 800
    });

    await autoScroll(page);

    await page.screenshot({
        path: 'yoursite.png',
        fullPage: true
    });

    await browser.close();
})();

async function autoScroll(page){
    await page.evaluate(async () => {
        await new Promise((resolve, reject) => {
            var totalHeight = 0;
            var distance = 100;
            var timer = setInterval(() => {
                var scrollHeight = document.body.scrollHeight;
                window.scrollBy(0, distance);
                totalHeight += distance;

                if(totalHeight >= scrollHeight){
                    clearInterval(timer);
                    resolve();
                }
            }, 100);
        });
    });
}

Example 2: simulate schrool event puppeter

const autoScroll = async (page) => {
  await page.evaluate(async () => {
    await new Promise((resolve, reject) => {
      let totalHeight = 0
      let distance = 100
      let timer = setInterval(() => {
        let scrollHeight = document.body.scrollHeight
        window.scrollBy(0, distance)
        totalHeight += distance
        if(totalHeight >= scrollHeight){
          clearInterval(timer)
          resolve()
        }
      }, 100)
    })
  })
}