Creating a custom selector engine in Playwright involves a few steps.
First, you need to register your custom selector engine using the selectors.register()
method. This method requires a create
function, a query
function, and a queryAll
function.
Here's an example of how to register a custom engine that queries elements based on their tag name:
import { selectors } from '@playwright/test';
const createTagNameEngine = () => ({
query(root: Document | ShadowRoot | Element, selector: string) {
return root.querySelector(selector);
},
queryAll(root: Document | ShadowRoot | Element, selector: string) {
return Array.from(root.querySelectorAll(selector));
},
});
await selectors.register('tag', createTagNameEngine);
Once registered, you can use your custom selector engine by prefixing the selector with its name. For example:
const button = page.locator('tag=button');
You can also combine your custom selectors with built-in locators and use them in any methods that support selectors. For example:
await page.locator('tag=div').getByText('Click me').click();
And you can perform assertions on elements selected using your custom engine:
await expect(page.locator('tag=button')).toHaveCount(3);
Remember to register your selectors before creating any pages in Playwright. For more details, check out Mastering Playwright Test Automation: Your Comprehensive Cheat Sheet.
If you still have questions, please ask a question and I will try to answer it.
Rayrun is a community for QA engineers. I am constantly looking for new ways to add value to people learning Playwright and other browser automation frameworks. If you have feedback, email [email protected].