Window blur and focus events in headful/headless mode

Puppeteer doesn’t have any page method to simulate or dispatch blur and focus window events.

I was trying to evaluate window.focus(); and window.blur(); but event was not fired.

I was trying to dispatch:

const event = document.createEvent('Event');
event.initEvent('blur', true, false);
window.dispatchEvent(event);

Of course event is not trusted after manual dispatching.

After my PR we have bringToFront method, which can help with focus in headful, but what about headless. Any suggestions or ideas?

[schelkun]

@maxwellllll this method is not working in headless.

const puppeteer = require('puppeteer');

(async() => {
    try {
        const browser = await puppeteer.launch({
            headless: false,
            timeout: 10000
        });

        const page = await browser.newPage();

        await page.setViewport({
            width: 1280,
            height: 800
        });

        await page.goto('https://schelkun.github.io/padding-link/');

        await page.evaluate(() => {
            window.addEventListener('visibilitychange', (event) => {
               let c = document.createElement('code');
               c.style.display = 'block';
               c.textContent = 'Event fired!';
               document.body.appendChild(c);
            });
        });

        const selectorWaiter = new Promise(async (resolve, reject) => {
            await page.waitForSelector('code');
            console.log('Code tag exist!');
            resolve();
        });

        const targetChanger = new Promise(async (resolve, reject) => {
            await browser._connection.send('Target.activateTarget', {
                targetId: page._client.targetId()
            });
            console.log('Target changed back!');
            resolve();
        });

        await browser.newPage();

        await Promise.all([selectorWaiter, targetChanger]);
    } catch (e) {
        console.log(e);
    }
})();

Try to execute with headless true and false. visibilitychange is not working at headless at all.

[lixiaolihua]

+1