Test your AI Agents with the all-new Agent to Agent Testing Platform.Learn More

How to use EvaluateAsync method of Microsoft.Playwright.Core.JSHandle class

Best Playwright-dotnet code snippet using Microsoft.Playwright.Core.JSHandle.EvaluateAsync

JSHandle.cs

Source:JSHandle.cs

...40        ChannelBase IChannelOwner.Channel => _channel;41        IChannel<JSHandle> IChannelOwner<JSHandle>.Channel => _channel;42        internal string Preview { get; set; }43        public IElementHandle AsElement() => this as IElementHandle;44        public async Task<JsonElement?> EvaluateAsync(string expression, object arg = null)45            => ScriptsHelper.ParseEvaluateResult<JsonElement?>(await _channel.EvaluateExpressionAsync(46                script: expression,47                arg: ScriptsHelper.SerializedArgument(arg)).ConfigureAwait(false));48        public async Task<IJSHandle> EvaluateHandleAsync(string expression, object arg = null)49            => (await _channel.EvaluateExpressionHandleAsync(50                script: expression,51                arg: ScriptsHelper.SerializedArgument(arg)).ConfigureAwait(false))?.Object;52        public async Task<T> EvaluateAsync<T>(string expression, object arg = null)53            => ScriptsHelper.ParseEvaluateResult<T>(await _channel.EvaluateExpressionAsync(54                script: expression,55                arg: ScriptsHelper.SerializedArgument(arg)).ConfigureAwait(false));56        public async Task<T> JsonValueAsync<T>() => ScriptsHelper.ParseEvaluateResult<T>(await _channel.JsonValueAsync().ConfigureAwait(false));57        public async Task<IJSHandle> GetPropertyAsync(string propertyName) => (await _channel.GetPropertyAsync(propertyName).ConfigureAwait(false))?.Object;58        public async Task<Dictionary<string, IJSHandle>> GetPropertiesAsync()59        {60            var result = new Dictionary<string, IJSHandle>();61            var channelResult = await _channel.GetPropertiesAsync().ConfigureAwait(false);62            foreach (var kv in channelResult)63            {64                result[kv.Name] = kv.Value.Object;65            }66            return result;...

EvaluateAsync

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 page = await browser.NewPageAsync();13            var element = await page.QuerySelectorAsync("input[name='q']");14            var jsHandle = await element.EvaluateHandleAsync("element => element");15            var result = await jsHandle.EvaluateAsync<string>("element => element.nodeName");16            Console.WriteLine(result);17        }18    }19}20using System;21using System.Threading.Tasks;22using Microsoft.Playwright;23{24    {25        static async Task Main(string[] args)26        {27            using var playwright = await Playwright.CreateAsync();28            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions29            {30            });31            var page = await browser.NewPageAsync();32            var element = await page.QuerySelectorAsync("input[name='q']");33            var result = await element.EvaluateAsync<string>("element => element.nodeName");34            Console.WriteLine(result);35        }36    }37}38using System;39using System.Threading.Tasks;40using Microsoft.Playwright;41{42    {43        static async Task Main(string[] args)44        {45            using var playwright = await Playwright.CreateAsync();46            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions47            {48            });49            var page = await browser.NewPageAsync();50            var result = await page.EvaluateAsync<string>("() => document.title");51            Console.WriteLine(result);52        }53    }54}55using System;

EvaluateAsync

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();10            var page = await browser.NewPageAsync();11            var jsHandle = await page.EvaluateHandleAsync("() => document.body");

EvaluateAsync

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            await page.TypeAsync("input[name=q]", "Microsoft");14            await page.ClickAsync("input[value='Google Search']");15            await page.WaitForLoadStateAsync(LoadState.DOMContentLoaded);16            var searchResults = await page.QuerySelectorAllAsync("div.g");17            var resultTexts = await Task.WhenAll(searchResults.Select(async result =>18            {19                var titleElement = await result.QuerySelectorAsync("h3");20                var title = await titleElement.EvaluateAsync<string>("node => node.textContent");21                var urlElement = await result.QuerySelectorAsync("cite");22                var url = await urlElement.EvaluateAsync<string>("node => node.textContent");23                return $"{title} - {url}";24            }));25            foreach (var resultText in resultTexts)26            {27                Console.WriteLine(resultText);28            }29        }30    }31}

EvaluateAsync

Using AI Code Generation

1using Microsoft.Playwright;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            await 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 elementHandle = await page.QuerySelectorAsync("input[title='Search']");14            var value = await elementHandle.EvaluateAsync<string>("input => input.value");15            Console.WriteLine(value);16        }17    }18}

EvaluateAsync

Using AI Code Generation

1using Microsoft.Playwright;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            await 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 elementHandle = await page.QuerySelectorAsync("input[title='Search']");14            var value = await elementHandle.EvaluateAsync<string>("input => input.value");15            Console.WriteLine(value);16        }17    }18}

EvaluateAsync

Using AI Code Generation

1using System.Threading.Tasks;2using Microsoft.Playwright;3using Microsoft.Playwright.Core;4using Microsoft.Playwright.Helpers;5using Microsoft.Playwright.Transport.Channels;6using Microsoft.Playwright.Transport.Protocol;7using Microsoft.Playwright.Transport;8{9    {10        static async Task Main(string[] args)11        {12            using var playwright = await Playwright.CreateAsync();13            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions14            {

EvaluateAsync

Using AI Code Generation

1var page = await browser.NewPageAsync();2var jsHandle = await page.EvaluateHandleAsync("() => document.querySelector('body')");3var json = await jsHandle.EvaluateAsync<string>("(e) => JSON.stringify(e)", jsHandle);4Console.WriteLine(json);5var page = await browser.NewPageAsync();6var jsHandle = await page.EvaluateHandleAsync("() => document.querySelector('body')");7var json = await jsHandle.EvaluateAsync<string>("(e) => JSON.stringify(e)", jsHandle);8Console.WriteLine(json);9var page = await browser.NewPageAsync();10var jsHandle = await page.EvaluateHandleAsync("() => document.querySelector('body')");11var json = await jsHandle.EvaluateAsync<string>("(e) => JSON.stringify(e)", jsHandle);12Console.WriteLine(json);13var page = await browser.NewPageAsync();14var jsHandle = await page.EvaluateHandleAsync("() => document.querySelector('body')");15var json = await jsHandle.EvaluateAsync<string>("(e) => JSON.stringify(e)", jsHandle);16Console.WriteLine(json);17var page = await browser.NewPageAsync();18var jsHandle = await page.EvaluateHandleAsync("() => document.querySelector('body')");19var json = await jsHandle.EvaluateAsyn <string>("(e) => JSON.stringify(e)", jsHandle);20Conso e.WriteLine(json);21var page = await b vwser.NewPaaeAsync();22var jsHandle = await page.Evalu teHandleAsync("() => docupent.querySelector('body')");age = await browser.NewPageAsync();23            var jsHandle = await page.EvaluateHandleAsync(@"() => {24                return document.querySelector('body');25            }");26            var result = await jsHandle.EvaluateAsync<string>(@"(element) => {27                return element.innerText;28            }", jsHandle);29            Console.WriteLine(result);30            await browser.CloseAsync();31        }32    }33}34using System.Threading.Tasks;35using Microsoft.Playwright;36using Microsoft.Playwright.Core;37using Microsoft.Playwright.Helpers;38using Microsoft.Playwright.Transport.Channels;39using Microsoft.Playwright.Transport.Protocol;40using Microsoft.Playwright.Transport;41{42    {43        static async Task Main(string[] args)44        {45            using var playwright = await Playwright.CreateAsync();46            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions47            {48            });49            var page = await browser.NewPageAsync();50            var jsHandle = await page.EvaluateHandleAsync(@"() => {51                return document.querySelector('body');52            }");53            var result = await jsHandle.EvaluateHandleAsync(@"(element) => {54                return element;55            }", jsHandle);56            Console.WriteLine(result);57            await browser.CloseAsync();58        }59    }60}61using System.Threading.Tasks;62using Microsoft.Playwright;63using Microsoft.Playwright.Core;64using Microsoft.Playwright.Helpers;65using Microsoft.Playwright.Transport.Channels;66using Microsoft.Playwright.Transport.Protocol;67using Microsoft.Playwright.Transport;68{

EvaluateAsync

Using AI Code Generation

1using Microsoft.Playwright;2using System;3using System.Threading.Tasks;4{5    static async Task Main(string[] args)6    {7        await using var playwright = await Playwright.CreateAsync();8        await using var browser = await playwright.Chromium.LaunchAsync();9        var page = await browser.NewPageAsync();10        var handle = await page.EvaluateHandleAsync("document.title");11        Console.WriteLine(await handle.EvaluateAsync<string>("x => x"));12    }13}14using Microsoft.Playwright;15using System;16using System.Threading.Tasks;17{18    static async Task Main(string[] args)19    {20        await using var playwright = await Playwright.CreateAsync();21        await using var browser = await playwright.Chromium.LaunchAsync();22        var page = await browser.NewPageAsync();23        var handle = await page.EvaluateHandleAsync("document.title");24        Console.WriteLine(await handle.EvaluateAsync<string>(aunchAsync();25        var page = await browser.NewPageAsync();

EvaluateAsync

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 context = await browser.NewContextAsync();11            var page = await context.NewPageAsync();12            var jsHandle = await page.QuerySelectorAsync("body");13            var result = await jsHandle.EvaluateAsync<string>("() => document.body.innerText");14            Console.WriteLine(result);15        }16    }17}18using System;19using System.T>reading.Tasks;20using Microsoft.Playwright;21{22    {23        static async Task Main(string[] args)24        {

EvaluateAsync

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 BrowserTypeLaunchOptions { Headless = false });10            var page = await browser.NewPageAsync();11            await page.EvaluateAsync("() => document.getElementById('result').value = 'Hello from Playwright'");12            var result = await page.EvaluateAsync<string>("() => document.getElementById('result').value");13            Console.WriteLine(result);14            page.Console += (sender, e) => Console.WriteLine(e.Text);15            await page.EvaluateAsync("() => console.log('Hello from the browser console!')");16        }17    }18}19using System;20using System.Threading.Tasks;21using Microsoft.Playwright;22{23    {24        static async Task Main(string[] args)25        {26            using var playwright = await Playwright.CreateAsync();27            await using var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions { Headless = false });28            var page = await browser.NewPageAsync();29            await page.EvaluateAsync("() => document.getElementById('result').value = 'Hello from Playwright'");30            var result = await page.EvaluateAsync<string>("() => document.getElementById('result').value");31            using var playwright = await Playwright.Create x"));32         }awaitusing browser = await lywriht.Chromium.LaunchAsync(headless: false);33            var contxtContextAsync();34            var page = await context.NewageAsync();35            var result = await jsHandle.EvaluateAsync<string>("() => document.body.innerText");36            Console.WriteLine(result);37        }38    }39}40using System;41using System.Threading.Tasks;42using Microsoft.Playwright;43{44    {45        static async Task Main(string[] args)46        {47            using var playwright = await Playwright.CreateAsync();48            await using var browser = await playwright.Chromium.LaunchAsync(headless:49}50using Microsoft.Playwright;51using System;52using System.Threading.Tasks;53{54    static async Task Main(string[] args)55    {56        await using var playwright = await Playwright.CreateAsync();57        await using var browser = await playwright.Chromium.LaunchAsync();58        var page = await browser.NewPageAsync();59        var handle = await page.EvaluateHandleAsync("document.title");60        Console.WriteLine(await handle.EvaluateAsync<string>("x => x"));61    }62}63using Microsoft.Playwright;64using System;65using System.Threading.Tasks;66{67    static async Task Main(string[] args)68    {69        await using var playwright = await Playwright.CreateAsync();70        await using var browser = await playwright.Chromium.LaunchAsync();71        var page = await browser.NewPageAsync();

EvaluateAsync

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 context = await browser.NewContextAsync();11            var page = await context.NewPageAsync();12            var jsHandle = await page.QuerySelectorAsync("body");13            var result = await jsHandle.EvaluateAsync<string>("() => document.body.innerText");14            Console.WriteLine(result);15        }16    }17}18using System;19using System.Threading.Tasks;20using Microsoft.Playwright;21{22    {23        static async Task Main(string[] args)24        {25            using var playwright = await Playwright.CreateAsync();26            await using var browser = await playwright.Chromium.LaunchAsync(headless: false);27            var context = await browser.NewContextAsync();28            var page = await context.NewPageAsync();29            var jsHandle = await page.QuerySelectorAsync("body");30            var result = await jsHandle.EvaluateAsync<string>("() => document.body.innerText");31            Console.WriteLine(result);32        }33    }34}35using System;36using System.Threading.Tasks;37using Microsoft.Playwright;38{39    {40        static async Task Main(string[] args)41        {42            using var playwright = await Playwright.CreateAsync();43            await using var browser = await playwright.Chromium.LaunchAsync(headless:

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.