Playwright　その他の操作

イベント発生時に処理を行う

Playwrightで指定したイベントが発生したときに処理を行う方法です。
１回だけイベント処理を行う場合はPage.once()を使用します。

サンプル

loadイベント、requestイベント、responseイベント発生時に処理を行うサンプルです。 

						const pw = require('playwright');

						(async () => {
						  const browser = await pw.chromium.launch({ headless: false });
						  const context = await browser.newContext();
						  const page = await context.newPage();
						
						  page.once('load', () => console.log('Page loaded!'));
						  page.once("request", req => {console.log(req.method()) + " " + console.log(req.headers())});
						  page.once("response", res => {console.log(res.status() + " " + res.url())});
						
						  await page.goto('https://web.biz-prog.net/test/testpage.html');
						
						  await browser.close();
						})();
					
						private async void btnEvent_Click(object sender, EventArgs e)
						{
							using var playwright = await Playwright.CreateAsync();
							await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions() { Headless = false });
							var page = await browser.NewPageAsync();
				
							page.Load += (_, _) => Debug.WriteLine($"Page loaded!");
							page.Request += (_, req) => Debug.WriteLine($"Request:{req.Method} {req.Url}");
							page.Response += (_, res) => Debug.WriteLine($"Response:{res.Status} {res.Url}");
				
							await page.GotoAsync("https://web.biz-prog.net/test/testpage.html");
						}
					
						from playwright.sync_api import sync_playwright

						with sync_playwright() as p:
						
							browser = p.chromium.launch(headless=False)
							page = browser.new_page()
						
							page.once('load', print('Page loaded!'))
							page.once("request", lambda req : print("{} {}".format(req.method, req.headers)))
							page.once("response", lambda res : print("{} {}".format(res.status, res.url)))
						
							page.goto("https://web.biz-prog.net/test/testpage.html")
						
						    browser.close()

継続してイベント処理を行う場合はPage.on()を使用します。
処理が不要になればPage.off()で解放します。

サンプル

						const pw = require('playwright');

						(async () => {
						  const browser = await pw.chromium.launch({ headless: false });
						  const context = await browser.newContext();
						  const page = await context.newPage();
						
						  page.on("load", load);
						  page.on("request", request);
						  page.on("response", response);
						
						  await page.goto('https://web.biz-prog.net/test/testpage.html');
						
						  page.off("load", load);
						  page.off("request", request);
						  page.off("response", response);
						
						  await browser.close();
						})();
						
						function load() {
						  console.log('Page loaded!')
						}
						
						function request(req) {
						  console.log(req.method()) + " " + console.log(req.headers())
						}
						
						function response(res) {
						  console.log(res.status() + " " + res.url())
						}
					
						private async void btnEvent2_Click(object sender, EventArgs e)
						{
							using var playwright = await Playwright.CreateAsync();
							await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions() { Headless = false });
							var page = await browser.NewPageAsync();
				
							page.Load += Page_Load;
							page.Request += Page_Request;
							page.Response += Page_Response;
				
							await page.GotoAsync("https://web.biz-prog.net/test/testpage.html");
				
							page.Request -= Page_Request;
							page.Response -= Page_Response;
						}

						private void Page_Load(object? sender, IPage e)
						{
							Debug.WriteLine($"Page loaded!");
						}
				
						private void Page_Response(object? sender, IResponse e)
						{
							Debug.WriteLine($"Response:{e.Status} {e.Url}");
						}
				
						private void Page_Request(object? sender, IRequest e)
						{
							Debug.WriteLine($"Request:{e.Method} {e.Url}");
						}
					
						from playwright.sync_api import sync_playwright

						def load():
							print('Page loaded!')
						
						def request(req):
							print(req.method)
							print(req.headers)
						
						def response(res):
							print(res.status)
							print(res.url)
						
						with sync_playwright() as p:
						
							browser = p.chromium.launch(headless=False)
							page = browser.new_page()
						
							page.on('load', load)
							page.on("request", request)
							page.on("response", response)
						
							page.goto("https://web.biz-prog.net/test/testpage.html")
						
							page.remove_listener("load", load)
							page.remove_listener("request", request)
							page.remove_listener("response", response)
						
						    browser.close()

参考

Events