How to use ElementHandleQuerySelectorEvalTests class of PuppeteerSharp.Tests.QuerySelectorTests package

Best Puppeteer-sharp code snippet using PuppeteerSharp.Tests.QuerySelectorTests.ElementHandleQuerySelectorEvalTests

ElementHandleQuerySelectorEvalTests.cs

Source: ElementHandleQuerySelectorEvalTests.cs Github

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...6using Xunit.Abstractions;7namespace PuppeteerSharp.Tests.QuerySelectorTests8{9 [Collection(TestConstants.TestFixtureCollectionName)]10 public class ElementHandleQuerySelectorEvalTests : PuppeteerPageBaseTest11 {12 public ElementHandleQuerySelectorEvalTests(ITestOutputHelper output) : base(output)13 {14 }15 async Task Usage(Browser browser)16 {17 #region Evaluate18 await using var page = await browser.NewPageAsync();19 var seven = await page.EvaluateExpressionAsync<int>("4 + 3");20 var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);21 Console.WriteLine(someObject.a);22 #endregion23 }24 [PuppeteerTest("queryselector.spec.ts", "ElementHandle.$eval", "should work")]25 [PuppeteerFact]26 public async Task QuerySelectorShouldWork()...

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ElementHandleQuerySelectorEvalTests

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1using PuppeteerSharp.Tests.QuerySelectorTests;2{3 {4 public async Task ShouldWork()5 {6 await Page.SetContentAsync("<section id=\"testAttribute\">43543</​section>");7 var element = await Page.QuerySelectorAsync("section");8 var text = await element.QuerySelectorEvalAsync<string>("id", "e => e.textContent");9 Assert.Equal("testAttribute", text);10 }11 public async Task ShouldThrowIfNoElementIsFound()12 {13 await Page.SetContentAsync("<section>43543</​section>");14 var element = await Page.QuerySelectorAsync("section");15 var exception = await Assert.ThrowsAsync<PuppeteerException>(() => element.QuerySelectorEvalAsync<string>("id", "e => e.textContent"));16 Assert.Contains("Unable to find element", exception.Message);17 }18 }19}20using PuppeteerSharp.Tests.QuerySelectorTests;21{22 {23 public async Task ShouldWork()24 {25 await Page.SetContentAsync("<div>hello</​div><div>beautiful</​div><div>world!</​div>");26 var html = await Page.QuerySelectorAsync("div");27 var elements = await html.QuerySelectorAllAsync("*");28 Assert.Equal(3, elements.Length);29 }30 public async Task ShouldReturnEmptyArrayIfNothingIsFound()31 {32 await Page.SetContentAsync("<div>hello</​div><div>beautiful</​div><div>world!</​div>");33 var html = await Page.QuerySelectorAsync("span");34 var elements = await html.QuerySelectorAllAsync("*");35 Assert.Empty(elements);36 }37 }38}39using PuppeteerSharp.Tests.QuerySelectorTests;40{41 {42 public async Task ShouldWork()43 {44 await Page.SetContentAsync("<section>test

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ElementHandleQuerySelectorEvalTests

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1using PuppeteerSharp.Tests.QuerySelectorTests;2using PuppeteerSharp.Tests.QuerySelectorTests;3using PuppeteerSharp.Tests.QuerySelectorTests;4using PuppeteerSharp.Tests.QuerySelectorTests;5using PuppeteerSharp.Tests.QuerySelectorTests;6using PuppeteerSharp.Tests.QuerySelectorTests;7using PuppeteerSharp.Tests.QuerySelectorTests;8using PuppeteerSharp.Tests.QuerySelectorTests;9using PuppeteerSharp.Tests.QuerySelectorTests;10using PuppeteerSharp.Tests.QuerySelectorTests;11using PuppeteerSharp.Tests.QuerySelectorTests;12using PuppeteerSharp.Tests.QuerySelectorTests;13using PuppeteerSharp.Tests.QuerySelectorTests;14using PuppeteerSharp.Tests.QuerySelectorTests;15using PuppeteerSharp.Tests.QuerySelectorTests;

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ElementHandleQuerySelectorEvalTests

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1using PuppeteerSharp.Tests.QuerySelectorTests;2using System;3using System.Threading.Tasks;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.QuerySelectorEvalAsync("input[name=q]", "element => element.value = 'PuppeteerSharp'");14 await page.QuerySelectorEvalAsync("input[name=q]", "element => element.value");15 await page.QuerySelectorEvalAsync("input[name=q]", "element => element.value = 'PuppeteerSharp'");16 await page.QuerySelectorEvalAsync("input[name=q]", "element => element.value");17 await browser.CloseAsync();18 }19 }20}21var page = await browser.NewPageAsync();22await page.QuerySelectorEvalAsync("input[name=q]", "element => element.value = 'PuppeteerSharp'");23var value = await page.QuerySelectorEvalAsync("input[name=q]", "element => element.value");24Console.WriteLine(value);25var page = await browser.NewPageAsync();26await page.QuerySelectorEvalAsync("input[name=q]", "element => element.value = 'PuppeteerSharp'");27var value = await page.QuerySelectorEvalAsync("input[name=q]", "element => element.value");28Console.WriteLine(value);

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ElementHandleQuerySelectorEvalTests

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1using PuppeteerSharp.Tests.QuerySelectorTests;2using System;3using System.Threading.Tasks;4{5 {6 public async Task ShouldWork()7 {8 await Page.SetContentAsync("<section id='testAttribute'>43543</​section>");9 var html = await Page.QuerySelectorAsync("section").QuerySelectorEvalAsync<string>("id", "e => e.textContent");10 Assert.Equal("43543", html);11 }12 }13}14using PuppeteerSharp.Tests.QuerySelectorTests;15using System;16using System.Threading.Tasks;17{18 {19 public async Task ShouldThrowAnErrorIfNoElementIsFound()20 {21 await Page.SetContentAsync("<section>test</​section>");22 var exception = await Assert.ThrowsAsync<PuppeteerException>(async () => await Page.QuerySelectorAsync("section").QuerySelectorEvalAsync<string>("no-existo", "e => e.textContent"));23 Assert.Equal("Error: failed to find element matching selector \"no-existo\"", exception.Message);24 }25 }26}27using PuppeteerSharp.Tests.QuerySelectorTests;28using System;29using System.Threading.Tasks;30{31 {32 public async Task ShouldRetainElementHandles()33 {34 await Page.SetContentAsync("<section>test</​section>");35 var element = await Page.QuerySelectorAsync("section");36 await element.QuerySelectorEvalAsync<string>("section", "e => e.textContent");37 Assert.NotNull(element);38 }39 }40}41using PuppeteerSharp.Tests.QuerySelectorTests;42using System;43using System.Threading.Tasks;44{

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ElementHandleQuerySelectorEvalTests

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1using PuppeteerSharp.Tests.QuerySelectorTests;2{3 [Collection("PuppeteerLoaderFixture collection")]4 {5 public async Task ShouldWork()6 {7 await Page.SetContentAsync("<section id='testAttribute'>43543</​section>");8 var element = await Page.QuerySelectorAsync("section");9 var text = await element.QuerySelectorEvalAsync<string>("id", "e => e.textContent");10 Assert.Equal("testAttribute", text);11 }12 }13}14{15 [Collection("PuppeteerLoaderFixture collection")]16 {17 public async Task ShouldWork()18 {19 await Page.SetContentAsync("<section id='testAttribute'>43543</​section>");20 var element = await Page.QuerySelectorAsync("section");21 var text = await element.QuerySelectorEvalAsync<string>("id", "e => e.textContent");22 Assert.Equal("testAttribute", text);23 }24 }25}

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StackOverFlow community discussions

Questions
Discussion

Is there a remove page method corresponding to NewPageAsync() in PuppeteerSharp?

how to use puppeteer-sharp touchStart and touchEnd and touch move

How to set download behaviour in PuppeteerSharp?

PuppeteerSharp throws ChromiumProcessException &quot;Failed to create connection&quot; when launching a browser

How to get text out of ElementHandle?

PuppeteerSharp - querySelectorAll + click

How do you set a cookie in Puppetteer-Sharp?

PuppeteerSharp best practices

PuppeteerSharp evaluate expression to complex type?

Puppeteer Sharp strange behaviour

You can close the page using CloseAsync:

var page = browser.NewPageAsync();
////
await page.CloseAsync();

An using block will also close the page:

using (var page = await new browser.PageAsync())
{
///
}

Puppeteer-Sharp v2.0.3+ also supports await using blocks

await using (var page = await new browser.PageAsync())
{
 ///
}
https://stackoverflow.com/questions/61517099/is-there-a-remove-page-method-corresponding-to-newpageasync-in-puppeteersharp

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