Answer

Waiting for Elements in Playwright

In Playwright, you can use the waitForSelector method to pause execution until a specific element appears. This method waits for the specified selector to satisfy a state option, such as 'attached', 'detached', 'visible', or 'hidden'. If the selector doesn't meet the condition within a given timeout, an exception is thrown.

Playwright automatically waits for elements to be ready before performing actions. But, if you need more control over when an element appears or disappears, waitForSelector is your go-to method. It works across navigations and returns null if waiting for a hidden or detached element.

Here's how you can use waitForSelector:

import { chromium } from 'playwright';

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();

  await page.goto('https://ray.run');
  const button = await page.waitForSelector('#my-button');

  // Do something with button...
  
  await browser.close();
})();

In this example, we launch a Chromium browser instance, navigate to https://ray.run, and wait for an element with ID "my-button" to appear. Once it appears, we store it in a variable and perform some action.

By using methods like waitForSelector, you can ensure your code behaves as expected when dealing with asynchronous behavior like loading web pages or interacting with user interfaces.