Wait Until the Element Disappears with Puppeteer (Pyppeteer)

Because it's Python, we're using Pyppeteer. The same approach should work for Puppeteer in JS as well.

Here, we introduce code to wait until an element disappears.

from pyppeteer.browser import Browser
from pyppeteer.errors import TimeoutError
from pyppeteer.page import Page


async def _wait_no_exist_for_selector(page: Page, selector, timeout=30000):
    for i in range(int(timeout / 100)):
        try:
            await page.waitForSelector(selector, timeout=100)
            await asyncio.sleep(0.1)
            continue
        except TimeoutError:
            return

    raise TimeoutError(f'{selector} did not disappear')

The timeout value for waitForSelector is the time used when the element doesn't exist, so it can be shorter (like 1).

The polling wait time when the element exists is the following:

await asyncio.sleep(0.1)