Best Puppeteer-sharp code snippet using PuppeteerSharp.Worker.EvaluateExpressionHandleAsync
Page.cs
Source:Page.cs
...329 /// <remarks>330 /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.331 /// </remarks>332 /// <returns>Task which resolves to script return value</returns>333 public async Task<JSHandle> EvaluateExpressionHandleAsync(string script)334 {335 var context = await MainFrame.GetExecutionContextAsync().ConfigureAwait(false);336 return await context.EvaluateExpressionHandleAsync(script).ConfigureAwait(false);337 }338 /// <summary>339 /// Executes a script in browser context340 /// </summary>341 /// <param name="pageFunction">Script to be evaluated in browser context</param>342 /// <param name="args">Function arguments</param>343 /// <remarks>344 /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.345 /// <see cref="JSHandle"/> instances can be passed as arguments346 /// </remarks>347 /// <returns>Task which resolves to script return value</returns>348 public async Task<JSHandle> EvaluateFunctionHandleAsync(string pageFunction, params object[] args)349 {350 var context = await MainFrame.GetExecutionContextAsync().ConfigureAwait(false);...
TargetTests.cs
Source:TargetTests.cs
...81 createdTargetTaskCompletion.SetResult(e.Target);82 Browser.TargetCreated -= TargetCreatedEventHandler;83 }84 Browser.TargetCreated += TargetCreatedEventHandler;85 var registration = await Page.EvaluateExpressionHandleAsync("navigator.serviceWorker.register('sw.js')");86 var createdTarget = await createdTargetTaskCompletion.Task;87 Assert.Equal("service_worker", createdTarget.Type);88 Assert.Equal(TestConstants.ServerUrl + "/sw.js", createdTarget.Url);89 var targetDestroyedTaskCompletion = new TaskCompletionSource<Target>();90 void TargetDestroyedEventHandler(object sender, TargetChangedArgs e)91 {92 targetDestroyedTaskCompletion.SetResult(e.Target);93 Browser.TargetDestroyed -= TargetDestroyedEventHandler;94 }95 Browser.TargetDestroyed += TargetDestroyedEventHandler;96 await Page.EvaluateFunctionAsync("registration => registration.unregister()", registration);97 Assert.Equal(createdTarget, await targetDestroyedTaskCompletion.Task);98 }99 [Fact]100 public async Task ShouldReportWhenATargetUrlChanges()101 {102 await Page.GoToAsync(TestConstants.EmptyPage);103 var changedTargetTaskCompletion = new TaskCompletionSource<Target>();104 void ChangedTargetEventHandler(object sender, TargetChangedArgs e)105 {106 changedTargetTaskCompletion.SetResult(e.Target);107 Browser.TargetChanged -= ChangedTargetEventHandler;108 }109 Browser.TargetChanged += ChangedTargetEventHandler;110 await Page.GoToAsync(TestConstants.CrossProcessUrl + "/");111 var changedTarget = await changedTargetTaskCompletion.Task;112 Assert.Equal(TestConstants.CrossProcessUrl + "/", changedTarget.Url);113 changedTargetTaskCompletion = new TaskCompletionSource<Target>();114 Browser.TargetChanged += ChangedTargetEventHandler;115 await Page.GoToAsync(TestConstants.EmptyPage);116 changedTarget = await changedTargetTaskCompletion.Task;117 Assert.Equal(TestConstants.EmptyPage, changedTarget.Url);118 }119 [Fact]120 public async Task ShouldNotReportUninitializedPages()121 {122 var targetChanged = false;123 EventHandler<TargetChangedArgs> listener = (sender, e) => targetChanged = true;124 Browser.TargetChanged += listener;125 var targetCompletionTask = new TaskCompletionSource<Target>();126 void TargetCreatedEventHandler(object sender, TargetChangedArgs e)127 {128 targetCompletionTask.SetResult(e.Target);129 Browser.TargetCreated -= TargetCreatedEventHandler;130 }131 Browser.TargetCreated += TargetCreatedEventHandler;132 var newPageTask = Browser.NewPageAsync();133 var target = await targetCompletionTask.Task;134 Assert.Equal(TestConstants.AboutBlank, target.Url);135 var newPage = await newPageTask;136 targetCompletionTask = new TaskCompletionSource<Target>();137 Browser.TargetCreated += TargetCreatedEventHandler;138 var evaluateTask = newPage.EvaluateExpressionHandleAsync("window.open('about:blank')");139 var target2 = await targetCompletionTask.Task;140 Assert.Equal(TestConstants.AboutBlank, target2.Url);141 await evaluateTask;142 await newPage.CloseAsync();143 Assert.False(targetChanged, "target should not be reported as changed");144 Browser.TargetChanged -= listener;145 }146 [Fact]147 public async Task ShouldNotCrashWhileRedirectingIfOriginalRequestWasMissed()148 {149 var serverResponseEnd = new TaskCompletionSource<bool>();150 var serverResponse = (HttpResponse)null;151 Server.SetRoute("/one-style.css", context => { serverResponse = context.Response; return serverResponseEnd.Task; });152 // Open a new page. Use window.open to connect to the page later....
Worker.cs
Source:Worker.cs
...83 /// <remarks>84 /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.85 /// </remarks>86 /// <returns>Task which resolves to script return value</returns>87 /// <seealso cref="ExecutionContext.EvaluateExpressionHandleAsync(string)"/>88 public async Task<JSHandle> EvaluateExpressionHandleAsync(string script)89 => await (await ExecutionContextTask.ConfigureAwait(false)).EvaluateExpressionHandleAsync(script).ConfigureAwait(false);90 internal Task<ExecutionContext> ExecutionContextTask => _executionContextCallback.Task;91 internal async void OnMessageReceived(object sender, MessageEventArgs e)92 {93 switch (e.MessageID)94 {95 case "Runtime.executionContextCreated":96 OnExecutionContextCreated(e);97 break;98 case "Runtime.consoleAPICalled":99 await OnConsoleAPICalled(e).ConfigureAwait(false);100 break;101 case "Runtime.exceptionThrown":102 OnExceptionThrown(e);103 break;...
EvaluateExpressionHandleAsync
Using AI Code Generation
1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 var browser = await Puppeteer.LaunchAsync(new LaunchOptions9 {10 Args = new[] { "--start-maximized" }11 });12 var page = await browser.NewPageAsync();13 var worker = await page.WaitForWorkerAsync();14 var result = await worker.EvaluateExpressionHandleAsync("document.body.innerHTML");15 Console.WriteLine(result);16 Console.ReadLine();17 }18 }19}20{21 result: {
EvaluateExpressionHandleAsync
Using AI Code Generation
1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 var browser = await Puppeteer.LaunchAsync(new LaunchOptions9 {10 Args = new string[] { "--no-sandbox" }11 });12 var page = await browser.NewPageAsync();13 await page.EvaluateExpressionHandleAsync("() => { return 1 + 2 }");14 await browser.CloseAsync();15 }16 }17}18using System;19using System.Threading.Tasks;20using PuppeteerSharp;21{22 {23 static async Task Main(string[] args)24 {25 var browser = await Puppeteer.LaunchAsync(new LaunchOptions26 {27 Args = new string[] { "--no-sandbox" }28 });29 var page = await browser.NewPageAsync();30 await Task.WhenAny(page.CloseAsync(), page.EvaluateExpressionHandleAsync("() => { return 1 + 2 }"));31 await browser.CloseAsync();32 }33 }34}
EvaluateExpressionHandleAsync
Using AI Code Generation
1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 {9 };10 using (var browser = await Puppeteer.LaunchAsync(options))11 {12 var page = await browser.NewPageAsync();13 var windowHandle = await page.EvaluateExpressionHandleAsync("window");14 var documentHandle = await page.EvaluateExpressionHandleAsync("document");15 var bodyHandle = await page.EvaluateExpressionHandleAsync("document.body");16 var html = await page.EvaluateExpressionAsync<string>("document.body.innerHTML");17 Console.WriteLine(html);18 await browser.CloseAsync();19 }20 }21 }22}
EvaluateExpressionHandleAsync
Using AI Code Generation
1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 var browser = await Puppeteer.LaunchAsync(new LaunchOptions9 {10 });11 var page = await browser.NewPageAsync();12 await page.EvaluateFunctionAsync(@"13 () => {14 }15 ");16 var worker = page.Workers[0];17 var result = await worker.EvaluateExpressionHandleAsync("1 + 2");18 Console.WriteLine(await result.JsonValueAsync());19 }20 }21}22using System;23using System.Threading.Tasks;24using PuppeteerSharp;25{26 {27 static async Task Main(string[] args)28 {29 var browser = await Puppeteer.LaunchAsync(new LaunchOptions30 {31 });32 var page = await browser.NewPageAsync();33 await page.EvaluateFunctionAsync(@"34 () => {35 }36 ");37 var worker = page.Workers[0];38 var result = await worker.EvaluateExpressionHandleAsync("document.body");39 Console.WriteLine(await result.JsonValueAsync());40 }41 }42}43using System;44using System.Threading.Tasks;45using PuppeteerSharp;46{47 {48 static async Task Main(string[] args)49 {50 var browser = await Puppeteer.LaunchAsync(new LaunchOptions51 {52 });53 var page = await browser.NewPageAsync();
EvaluateExpressionHandleAsync
Using AI Code Generation
1var browser = await Puppeteer.LaunchAsync(new LaunchOptions2{3 Args = new string[] { "--start-maximized" }4});5var page = await browser.NewPageAsync();6await page.WaitForSelectorAsync("input[title='Search']");7await page.ClickAsync("input[title='Search']");8await page.TypeAsync("input[title='Search']", "Puppeteer");9await page.Keyboard.PressAsync("Enter");10await page.WaitForSelectorAsync("div#search");11await page.ClickAsync("div#search");12await page.WaitForSelectorAsync("div.devsite-nav-title");13var title = await page.EvaluateExpressionAsync<string>("document.querySelector('div.devsite-nav-title').innerText");14Console.WriteLine(title);15await page.WaitForSelectorAsync("div.devsite-nav-title");16var titleHandle = await page.EvaluateExpressionHandleAsync("document.querySelector('div.devsite-nav-title')");17var title = await titleHandle.JsonValueAsync();18Console.WriteLine(title);19await page.WaitForSelectorAsync("div.devsite-nav-title");20var titleHandle = await page.EvaluateExpressionHandleAsync("document.querySelector('div.devsite-nav-title')");21var title = await titleHandle.JsonValueAsync<string>();22Console.WriteLine(title);23await page.WaitForSelectorAsync("div.devsite-nav-title");24var titleHandle = await page.EvaluateExpressionHandleAsync("document.querySelector('div.devsite-nav-title')");25var title = await titleHandle.JsonValueAsync<string>();26Console.WriteLine(title);27await page.WaitForSelectorAsync("div.devsite-nav-title");28var titleHandle = await page.EvaluateExpressionHandleAsync("document.querySelector('div.devsite-nav-title')");29var title = await titleHandle.JsonValueAsync<string>();30Console.WriteLine(title);31await page.WaitForSelectorAsync("div.devsite-nav-title");32var titleHandle = await page.EvaluateExpressionHandleAsync("document.querySelector('div.devsite-nav-title')");33var title = await titleHandle.JsonValueAsync();34Console.WriteLine(title);35await page.WaitForSelectorAsync("div.devsite-nav-title");36var titleHandle = await page.EvaluateExpressionHandleAsync("document.querySelector('div.devsite-nav-title')");
EvaluateExpressionHandleAsync
Using AI Code Generation
1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false });9 var page = await browser.NewPageAsync();10 var worker = await page.WorkerAsync();11 var expressionHandle = await worker.EvaluateExpressionHandleAsync("1+1");12 var result = await expressionHandle.JsonValueAsync();13 Console.WriteLine(result
Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.
You could also refer to video tutorials over LambdaTest YouTube channel to get step by step demonstration from industry experts.
Get 100 minutes of automation test minutes FREE!!