剧作家在暴露功能的范围内使用Page

Question

我在使用 Playwright 的expose_function API 时遇到问题。 我还希望能够将Page传递到公开函数中，以便能够在公开函数的上下文中导航、使用定位器等。

问题是公开函数中的 Page 实例以某种方式与其原始“断开连接”，并且不执行导航、定位器等。对 Page 方法的任何调用似乎都会无限期地阻塞。

考虑这个简化的例子：

from playwright.sync_api import sync_playwright, Page
from functools import partial


def search_title(page: Page, title: str):
    print(title)
    page.goto(f"https://bing.com?q={title}")


def main():
    with sync_playwright() as p:
        browser = p.chromium.launch(headless=False)
        context = browser.new_context(viewport={ 'width': 1920, 'height': 1024 })
        page = context.new_page()
        page.goto(f"https://wikipedia.org")
        context.expose_function("search_title", partial(handle_title, page))
        page.evaluate("window.onload = () => search_title(document.title)")
        while True:
            page.wait_for_timeout(1000)


if __name__ == "__main__":
    main()

它所做的是打印标题，并在导航步骤中无限期地停止。

编辑：使用上面相同代码的 asyncio 版本会产生playwright._impl._api_types.Error: Execution context was destroyed, most likely because of a navigation. 错误：

from playwright.async_api import  Page, async_playwright
import asyncio
from functools import partial
import time

async def handle_title(page: Page, title: str):
    print(title)
    print(page)
    await page.goto(f"https://bing.com?q={title}")


async def main():
     async with async_playwright() as p:
        browser = await p.chromium.launch(headless=False)
        context = await browser.new_context(viewport={ 'width': 1920, 'height': 1024 })
        page = await context.new_page()
        await page.goto(f"https://wikipedia.org")
        await context.expose_function("handle_title", partial(handle_title, page))
        await page.evaluate("window.onload = () => handle_title(document.title)")
        while True:
            await asyncio.sleep(1)


if __name__ == "__main__":
    asyncio.run(main())

Answer 1

我发现可以在公开功能的上下文中使用 Page ，只要：

1. 您使用异步剧作家（根据@hardkoded 的建议）
2. 不要离开（根据@Charchit 的建议）

from playwright.async_api import  Page, async_playwright
import asyncio
from functools import partial
import time


async def handle_title(page: Page, title: str):
    # page = page_var.get()
    print(page)
    await page.locator("#searchInput").type(f"{title}")
    return "hello world"


async def main():
     async with async_playwright() as p:
        browser = await p.chromium.launch(headless=False)
        context = await browser.new_context(viewport={ 'width': 1920, 'height': 1024 })
        page = await context.new_page()
        await page.goto(f"https://wikipedia.org")
        await context.expose_function("handle_title", partial(handle_title, page))
        await page.evaluate("window.onload = () => handle_title(document.title)")
        while True:
            await asyncio.sleep(1)



asyncio.run(main())