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How to use waiting_helper method in Playwright Python

Best Python code snippet using playwright-python

test_element_handle.py

Source:test_element_handle.py

...305    await div.evaluate("div => div.remove()")306    with pytest.raises(Error) as exc_info:307        await div.scroll_into_view_if_needed()308    assert "Element is not attached to the DOM" in exc_info.value.message309async def waiting_helper(page, after):310    div = await page.query_selector("div")311    done = list()312    async def scroll():313        done.append(False)314        await div.scroll_into_view_if_needed()315        done.append(True)316    promise = asyncio.create_task(scroll())317    await asyncio.sleep(0)  # execute scheduled tasks, but don't await them318    await page.evaluate("() => new Promise(f => setTimeout(f, 1000))")319    assert done == [False]320    await div.evaluate(after)321    await promise322    assert done == [False, True]323async def test_should_wait_for_display_none_to_become_visible(page):324    await page.set_content('<div style="display:none">Hello</div>')325    await waiting_helper(page, 'div => div.style.display = "block"')326async def test_should_wait_for_display_contents_to_become_visible(page):327    await page.set_content('<div style="display:contents">Hello</div>')328    await waiting_helper(page, 'div => div.style.display = "block"')329async def test_should_wait_for_visibility_hidden_to_become_visible(page):330    await page.set_content('<div style="visibility:hidden">Hello</div>')331    await waiting_helper(page, 'div => div.style.visibility = "visible"')332async def test_should_wait_for_zero_sized_element_to_become_visible(page):333    await page.set_content('<div style="height:0">Hello</div>')334    await waiting_helper(page, 'div => div.style.height = "100px"')335async def test_should_wait_for_nested_display_none_to_become_visible(page):336    await page.set_content('<span style="display:none"><div>Hello</div></span>')337    await waiting_helper(page, 'div => div.parentElement.style.display = "block"')338async def test_should_timeout_waiting_for_visible(page):339    await page.set_content('<div style="display:none">Hello</div>')340    div = await page.query_selector("div")341    with pytest.raises(Error) as exc_info:342        await div.scroll_into_view_if_needed(timeout=3000)343    assert "element is not visible" in exc_info.value.message344async def test_fill_input(page, server):345    await page.goto(server.PREFIX + "/input/textarea.html")346    handle = await page.query_selector("input")347    await handle.fill("some value")348    assert await page.evaluate("result") == "some value"349async def test_fill_input_when_Node_is_removed(page, server):350    await page.goto(server.PREFIX + "/input/textarea.html")351    await page.evaluate('delete window["Node"]')...

Playwright tutorial

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