Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

How to use WaitForFunctionAsync method of Microsoft.Playwright.Core.Frame class

Best Playwright-dotnet code snippet using Microsoft.Playwright.Core.Frame.WaitForFunctionAsync

Page.cs

Source:Page.cs

...319        public Task<IResponse> RunAndWaitForResponseAsync(Func<Task> action, Regex urlOrPredicate, PageRunAndWaitForResponseOptions options = default)320            => InnerWaitForEventAsync(PageEvent.Response, action, e => urlOrPredicate.IsMatch(e.Url), options?.Timeout);321        public Task<IResponse> RunAndWaitForResponseAsync(Func<Task> action, Func<IResponse, bool> urlOrPredicate, PageRunAndWaitForResponseOptions options = default)322            => InnerWaitForEventAsync(PageEvent.Response, action, e => urlOrPredicate(e), options?.Timeout);323        public Task<IJSHandle> WaitForFunctionAsync(string expression, object arg = default, PageWaitForFunctionOptions options = default)324            => MainFrame.WaitForFunctionAsync(expression, arg, new() { PollingInterval = options?.PollingInterval, Timeout = options?.Timeout });325        public async Task<T> InnerWaitForEventAsync<T>(PlaywrightEvent<T> pageEvent, Func<Task> action = default, Func<T, bool> predicate = default, float? timeout = default)326        {327            if (pageEvent == null)328            {329                throw new ArgumentException("Page event is required", nameof(pageEvent));330            }331            timeout ??= _defaultTimeout;332            using var waiter = new Waiter(this, $"page.WaitForEventAsync(\"{typeof(T)}\")");333            waiter.RejectOnTimeout(Convert.ToInt32(timeout), $"Timeout {timeout}ms exceeded while waiting for event \"{pageEvent.Name}\"");334            if (pageEvent.Name != PageEvent.Crash.Name)335            {336                waiter.RejectOnEvent<IPage>(this, PageEvent.Crash.Name, new("Page crashed"));337            }338            if (pageEvent.Name != PageEvent.Close.Name)...

Frame.cs

Source:Frame.cs

...385        public async Task<IElementHandle> QuerySelectorAsync(string selector)386            => (await _channel.QuerySelectorAsync(selector).ConfigureAwait(false))?.Object;387        public async Task<IReadOnlyList<IElementHandle>> QuerySelectorAllAsync(string selector)388            => (await _channel.QuerySelectorAllAsync(selector).ConfigureAwait(false)).Select(c => ((ElementHandleChannel)c).Object).ToList().AsReadOnly();389        public async Task<IJSHandle> WaitForFunctionAsync(string expression, object arg = default, FrameWaitForFunctionOptions options = default)390             => (await _channel.WaitForFunctionAsync(391                expression: expression,392                arg: ScriptsHelper.SerializedArgument(arg),393                timeout: options?.Timeout,394                polling: options?.PollingInterval).ConfigureAwait(false)).Object;395        public async Task<IElementHandle> WaitForSelectorAsync(string selector, FrameWaitForSelectorOptions options = default)396            => (await _channel.WaitForSelectorAsync(397                selector: selector,398                state: options?.State,399                timeout: options?.Timeout,400                strict: options?.Strict,401                omitReturnValue: false).ConfigureAwait(false))?.Object;402        public async Task<IElementHandle> LocatorWaitForAsync(string selector, LocatorWaitForOptions options = default)403            => (await _channel.WaitForSelectorAsync(404                selector: selector,...

FrameChannel.cs

Source:FrameChannel.cs

...90                    ["expression"] = script,91                    ["arg"] = arg,92                });93        }94        internal Task<JSHandleChannel> WaitForFunctionAsync(95            string expression,96            object arg,97            float? timeout,98            float? polling)99        {100            var args = new Dictionary<string, object>101            {102                ["expression"] = expression,103                ["arg"] = arg,104                ["timeout"] = timeout,105                ["pollingInterval"] = polling,106            };107            return Connection.SendMessageToServerAsync<JSHandleChannel>(108                Guid,...

WaitForFunctionAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4{5    {6        static async Task Main(string[] args)7        {8            using var playwright = await Playwright.CreateAsync();9            await using var browser = await playwright.Chromium.LaunchAsync(headless: false);10            var page = await browser.NewPageAsync();11            await page.ClickAsync("text=Sign in");12            await page.TypeAsync("[name=\"identifier\"]", "yourEmail");13            await page.ClickAsync("text=Next");14            await page.WaitForFunctionAsync("document.querySelector(\"[name=\\\"password\\\"]\").value.length >= 1");15            await page.TypeAsync("[name=\"password\"]", "yourPassword");16            await page.ClickAsync("text=Next");17            await page.WaitForLoadStateAsync(LoadState.DOMContentLoaded);18            await page.ScreenshotAsync(new PageScreenshotOptions { Path = "screenshot.png" });19        }20    }21}

WaitForFunctionAsync

Using AI Code Generation

1using Microsoft.Playwright;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            using var playwright = await Playwright.CreateAsync();9            await using var browser = await playwright.Chromium.LaunchAsync();10            var page = await browser.NewPageAsync();11            await page.WaitForFunctionAsync("() => document.querySelector('input[name=\"q\"]').value == 'test'");12        }13    }14}15using Microsoft.Playwright;16using System;17using System.Threading.Tasks;18{19    {20        static async Task Main(string[] args)21        {22            using var playwright = await Playwright.CreateAsync();23            await using var browser = await playwright.Chromium.LaunchAsync();24            var page = await browser.NewPageAsync();25            await page.WaitForFunctionAsync("() => document.querySelector('input[name=\"q\"]').value == 'test'");26        }27    }28}29using Microsoft.Playwright;30using System;31using System.Threading.Tasks;32{33    {34        static async Task Main(string[] args)35        {36            using var playwright = await Playwright.CreateAsync();37            await using var browser = await playwright.Chromium.LaunchAsync();38            var page = await browser.NewPageAsync();39            var input = await page.QuerySelectorAsync("input[name=\"q\"]");40            await input.WaitForFunctionAsync("() => document.querySelector('input[name=\"q\"]').value == 'test'");41        }42    }43}44using Microsoft.Playwright;45using System;46using System.Threading.Tasks;47{48    {49        static async Task Main(string[] args)50        {51            using var playwright = await Playwright.CreateAsync();52            await using var browser = await playwright.Chromium.LaunchAsync();53            var page = await browser.NewPageAsync();

WaitForFunctionAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4{5    {6        static async Task Main(string[] args)7        {8            using var playwright = await Playwright.CreateAsync();9            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions10            {11            });12            var context = await browser.NewContextAsync();13            var page = await context.NewPageAsync();14            await page.ClickAsync("input[name=q]");15            await page.TypeAsync("input[name=q]", "Hello World");16            await page.ClickAsync("input[name=btnK]");17            var result = await page.WaitForFunctionAsync("document.querySelector('input[name=q]').value == 'Hello World'");18        }19    }20}21using System;22using System.Threading.Tasks;23using Microsoft.Playwright;24{25    {26        static async Task Main(string[] args)27        {28            using var playwright = await Playwright.CreateAsync();29            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions30            {31            });32            var context = await browser.NewContextAsync();33            var page = await context.NewPageAsync();34            await page.ClickAsync("input[name=q]");35            await page.TypeAsync("input[name=q]", "Hello World");36            await page.ClickAsync("input[name=btnK]");37            var result = await page.WaitForFunctionAsync("document.querySelector('input[name=q]').value == 'Hello World'");38        }39    }40}41using System;42using System.Threading.Tasks;43using Microsoft.Playwright;44{45    {46        static async Task Main(string[] args)47        {48            using var playwright = await Playwright.CreateAsync();49            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions50            {51            });52            var context = await browser.NewContextAsync();53            var page = await context.NewPageAsync();54            await page.GotoAsync("https

WaitForFunctionAsync

Using AI Code Generation

1using Microsoft.Playwright.Core;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            var playwright = await Playwright.CreateAsync();9            var browser = await playwright.Chromium.LaunchAsync();10            var page = await browser.NewPageAsync();11            await page.WaitForFunctionAsync("() => document.title === 'Google'");12            await page.ScreenshotAsync("google.png");13            await browser.CloseAsync();14        }15    }16}17using Microsoft.Playwright.Core;18using System;19using System.Threading.Tasks;20{21    {22        static async Task Main(string[] args)23        {24            var playwright = await Playwright.CreateAsync();25            var browser = await playwright.Chromium.LaunchAsync();26            var page = await browser.NewPageAsync();27            await page.WaitForFunctionAsync("() => document.title === 'Google'", new WaitForFunctionOptions { Timeout = 5000 });28            await page.ScreenshotAsync("google.png");29            await browser.CloseAsync();30        }31    }32}33using Microsoft.Playwright.Core;34using System;35using System.Threading.Tasks;36{37    {38        static async Task Main(string[] args)39        {40            var playwright = await Playwright.CreateAsync();41            var browser = await playwright.Chromium.LaunchAsync();42            var page = await browser.NewPageAsync();43            await page.WaitForFunctionAsync("() => document.title === 'Google'", new WaitForFunctionOptions { PollingInterval = 500 });44            await page.ScreenshotAsync("google.png");45            await browser.CloseAsync();46        }47    }48}49using Microsoft.Playwright.Core;50using System;51using System.Threading.Tasks;52{53    {54        static async Task Main(string[] args)55        {56            var playwright = await Playwright.CreateAsync();

WaitForFunctionAsync

Using AI Code Generation

1using Microsoft.Playwright.Core;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            var playwright = await Playwright.CreateAsync();9            var browser = await playwright.Chromium.LaunchAsync();10            var page = await browser.NewPageAsync();11            var frame = page.MainFrame;12            var wait = await frame.WaitForFunctionAsync(@"() => {13                return document.querySelector('#foo') !== null;14            }", new WaitForFunctionOptions15            {16            });17            var result = await frame.EvaluateAsync<bool>(@"() => {18                return document.querySelector('#foo') !== null;19            }");20            Console.WriteLine(result);21            await browser.CloseAsync();22        }23    }24}25using Microsoft.Playwright.Core;26using System;27using System.Threading.Tasks;28{29    {30        static async Task Main(string[] args)31        {32            var playwright = await Playwright.CreateAsync();33            var browser = await playwright.Chromium.LaunchAsync();34            var page = await browser.NewPageAsync();35            var frame = page.MainFrame;36            var wait = await frame.WaitForFunctionAsync(@"() => {37                return document.querySelector('#foo') !== null;38            }", new WaitForFunctionOptions39            {40            });41            var result = await frame.EvaluateAsync<bool>(@"() => {42                return document.querySelector('#foo') !== null;43            }");44            Console.WriteLine(result);45            await browser.CloseAsync();46        }47    }48}49using Microsoft.Playwright.Core;50using System;51using System.Threading.Tasks;52{53    {54        static async Task Main(string

WaitForFunctionAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4using System.Linq;5{6    {7        static async Task Main(string[] args)8        {9            await using var playwright = await Playwright.CreateAsync();10            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions11            {12            });13            var page = await browser.NewPageAsync();14            var frame = page.MainFrame.ChildFrames.FirstOrDefault();15            await frame.WaitForFunctionAsync("() => window.innerWidth < 100");16            await page.ScreenshotAsync("screenshot.png");17            await browser.CloseAsync();18        }19    }20}21using System;22using System.Threading.Tasks;23using Microsoft.Playwright;24using System.Linq;25{26    {27        static async Task Main(string[] args)28        {29            await using var playwright = await Playwright.CreateAsync();30            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions31            {32            });

WaitForFunctionAsync

Using AI Code Generation

1using Microsoft.Playwright;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            using var playwright = await Playwright.CreateAsync();9            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions10            {11            });12            var page = await browser.NewPageAsync();13            var searchBox = await page.WaitForSelectorAsync("input[name=q]");14            await searchBox.TypeAsync("playwright");15            await page.ClickAsync("text=Search");16            await page.WaitForFunctionAsync("() => document.querySelector('.b_algo') != null");17            await page.ScreenshotAsync("screenshot.png");18        }19    }20}21using Microsoft.Playwright;22using System;23using System.Threading.Tasks;24{25    {26        static async Task Main(string[] args)27        {28            using var playwright = await Playwright.CreateAsync();29            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions30            {31            });32            var page = await browser.NewPageAsync();33            var searchBox = await page.WaitForSelectorAsync("input[name=q]");34            await searchBox.TypeAsync("playwright");35            await page.ClickAsync("text=Search");36            await page.WaitForFunctionAsync("() => document.querySelector('.b_algo') != null");37            await page.ScreenshotAsync("screenshot.png");38        }39    }40}41using Microsoft.Playwright;42using System;43using System.Threading.Tasks;44{45    {46        static async Task Main(string[] args

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.