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How to use EvaluateFunctionAsync method of PuppeteerSharp.Frame class

Best Puppeteer-sharp code snippet using PuppeteerSharp.Frame.EvaluateFunctionAsync

ExecutionContext.cs

Source:ExecutionContext.cs

...43        /// <param name="script">Script to be evaluated in browser context</param>44        /// <remarks>45        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.46        /// </remarks>47        /// <seealso cref="EvaluateFunctionAsync{T}(string, object[])"/>48        /// <seealso cref="EvaluateExpressionHandleAsync(string)"/>49        /// <returns>Task which resolves to script return value</returns>50        public Task<JToken> EvaluateExpressionAsync(string script) => EvaluateExpressionAsync<JToken>(script);51        /// <summary>52        /// Executes a script in browser context53        /// </summary>54        /// <typeparam name="T">The type to deserialize the result to</typeparam>55        /// <param name="script">Script to be evaluated in browser context</param>56        /// <remarks>57        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.58        /// </remarks>59        /// <seealso cref="EvaluateFunctionAsync{T}(string, object[])"/>60        /// <seealso cref="EvaluateExpressionHandleAsync(string)"/>61        /// <returns>Task which resolves to script return value</returns>62        public Task<T> EvaluateExpressionAsync<T>(string script)63            => RemoteObjectTaskToObject<T>(EvaluateExpressionInternalAsync(true, script));64        internal async Task<JSHandle> EvaluateExpressionHandleAsync(string script)65            => CreateJSHandle(await EvaluateExpressionInternalAsync(false, script).ConfigureAwait(false));66        /// <summary>67        /// Executes a function in browser context68        /// </summary>69        /// <param name="script">Script to be evaluated in browser context</param>70        /// <param name="args">Arguments to pass to script</param>71        /// <remarks>72        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.73        /// <see cref="JSHandle"/> instances can be passed as arguments74        /// </remarks>75        /// <seealso cref="EvaluateExpressionAsync{T}(string)"/>76        /// <returns>Task which resolves to script return value</returns>77        public Task<JToken> EvaluateFunctionAsync(string script, params object[] args) => EvaluateFunctionAsync<JToken>(script, args);78        /// <summary>79        /// Executes a function in browser context80        /// </summary>81        /// <typeparam name="T">The type to deserialize the result to</typeparam>82        /// <param name="script">Script to be evaluated in browser context</param>83        /// <param name="args">Arguments to pass to script</param>84        /// <remarks>85        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.86        /// <see cref="JSHandle"/> instances can be passed as arguments87        /// </remarks>88        /// <seealso cref="EvaluateExpressionAsync{T}(string)"/>89        /// <returns>Task which resolves to script return value</returns>90        public Task<T> EvaluateFunctionAsync<T>(string script, params object[] args)91            => RemoteObjectTaskToObject<T>(EvaluateFunctionInternalAsync(true, script, args));92        internal async Task<JSHandle> EvaluateFunctionHandleAsync(string script, params object[] args)93            => CreateJSHandle(await EvaluateFunctionInternalAsync(false, script, args).ConfigureAwait(false));94        /// <summary>95        /// The method iterates JavaScript heap and finds all the objects with the given prototype.96        /// </summary>97        /// <returns>A task which resolves to a handle to an array of objects with this prototype.</returns>98        /// <param name="prototypeHandle">A handle to the object prototype.</param>99        public async Task<JSHandle> QueryObjectsAsync(JSHandle prototypeHandle)100        {101            if (prototypeHandle.Disposed)102            {103                throw new PuppeteerException("Prototype JSHandle is disposed!");104            }...

BlazorTest.cs

Source:BlazorTest.cs

...266      Assert.Equal("puppeteer-sharp", innerHtml);267      Assert.Equal("<a data-pjax=\"#js-repo-pjax-container\" href=\"/kblok/puppeteer-sharp\">puppeteer-sharp</a>", outerHtml);268      Assert.Equal("https://github.com/kblok/puppeteer-sharp", url);269270      var innerText = await page.QuerySelectorAsync("h1 > strong > a").EvaluateFunctionAsync<string>("node => node.innerText");271      var outerText = await page.QuerySelectorAsync("h1 > strong > a").EvaluateFunctionAsync<string>("node => node.outerText");272      var textContent = await page.QuerySelectorAsync("h1 > strong > a").EvaluateFunctionAsync<string>("node => node.textContent");273      var hasContent = await page.QuerySelectorAsync("h1 > strong > a").EvaluateFunctionAsync<bool>("(node, value) => node.textContent.includes(value)", "puppeteer-sharp");274275      Assert.Equal("puppeteer-sharp", innerText);276      Assert.Equal("puppeteer-sharp", outerText);277      Assert.Equal("puppeteer-sharp", textContent);278      Assert.True(hasContent);279280      innerHtml = await page.QuerySelectorAsync("h1 > strong > a").EvaluateFunctionAsync<string>("element => element.innerHTML");281      outerHtml = await page.QuerySelectorAsync("h1 > strong > a").EvaluateFunctionAsync<string>("element => element.outerHTML");282      url = await page.QuerySelectorAsync("h1 > strong > a").EvaluateFunctionAsync<string>("element => element.getAttribute('href')");283284      Assert.Equal("puppeteer-sharp", innerHtml);285      Assert.Equal("<a data-pjax=\"#js-repo-pjax-container\" href=\"/kblok/puppeteer-sharp\">puppeteer-sharp</a>", outerHtml);286      Assert.Equal("/kblok/puppeteer-sharp", url);287288      innerText = await page.EvaluateFunctionAsync<string>("node => node.innerText", element);289      outerText = await page.EvaluateFunctionAsync<string>("node => node.outerText", element);290      textContent = await page.EvaluateFunctionAsync<string>("node => node.textContent", element);291292      Assert.Equal("puppeteer-sharp", innerText);293      Assert.Equal("puppeteer-sharp", outerText);294      Assert.Equal("puppeteer-sharp", textContent);295    }296  }*/
...

Examples.cs

Source:Examples.cs

...135        public async Task evaluate()136        {137            await _page.GoToAsync("https://github.com/hardkoded/puppeteer-sharp");138            var element = await _page.QuerySelectorAsync("h1 > strong > a");139            var outerHtml = await element.EvaluateFunctionAsync<string>("e => e.outerHTML");140            var innerText = await element.EvaluateFunctionAsync<string>("e => e.innerText");141            var url = await element.EvaluateFunctionAsync<string>("e => e.getAttribute('href')");142            var hasContent = await element.EvaluateFunctionAsync<bool>("(e, value) => e.textContent.includes(value)", "puppeteer-sharp");143            Assert.Equal("<a data-pjax=\"#js-repo-pjax-container\" href=\"/hardkoded/puppeteer-sharp\">puppeteer-sharp</a>", outerHtml);144            Assert.Equal("puppeteer-sharp", innerText);145            Assert.Equal("/hardkoded/puppeteer-sharp", url);146            Assert.True(hasContent);147            outerHtml = await _page.EvaluateFunctionAsync<string>("e => e.outerHTML", element);148            innerText = await _page.EvaluateFunctionAsync<string>("e => e.innerText", element);149            url = await _page.EvaluateFunctionAsync<string>("e => e.getAttribute('href')", element);150            hasContent = await _page.EvaluateFunctionAsync<bool>("(e, value) => e.textContent.includes(value)", element, "puppeteer-sharp");151            Assert.Equal("<a data-pjax=\"#js-repo-pjax-container\" href=\"/hardkoded/puppeteer-sharp\">puppeteer-sharp</a>", outerHtml);152            Assert.Equal("puppeteer-sharp", innerText);153            Assert.Equal("/hardkoded/puppeteer-sharp", url);154            Assert.True(hasContent);155            outerHtml = await _page.EvaluateExpressionAsync<string>($"document.querySelector({"'h1 > strong > a'"}).outerHTML");156            innerText = await _page.EvaluateExpressionAsync<string>($"document.querySelector({"'h1 > strong > a'"}).innerText");157            url = await _page.EvaluateExpressionAsync<string>($"document.querySelector({"'h1 > strong > a'"}).getAttribute('href')");158            hasContent = await _page.EvaluateExpressionAsync<bool>($"document.querySelector({"'h1 > strong > a'"}).textContent.includes({"'puppeteer-sharp'"})");159            Assert.Equal("<a data-pjax=\"#js-repo-pjax-container\" href=\"/hardkoded/puppeteer-sharp\">puppeteer-sharp</a>", outerHtml);160            Assert.Equal("puppeteer-sharp", innerText);161            Assert.Equal("/hardkoded/puppeteer-sharp", url);162            Assert.True(hasContent);163            outerHtml = await (await element.GetPropertyAsync("outerHTML")).JsonValueAsync<string>();164            innerText = await (await element.GetPropertyAsync("innerText")).JsonValueAsync<string>();165            url = await (await element.GetPropertyAsync("href")).JsonValueAsync<string>();166            hasContent = await (await element.GetPropertyAsync("textContent")).EvaluateFunctionAsync<bool>("(p, value) => p.includes(value)", "puppeteer-sharp");167            Assert.Equal("<a data-pjax=\"#js-repo-pjax-container\" href=\"/hardkoded/puppeteer-sharp\">puppeteer-sharp</a>", outerHtml);168            Assert.Equal("puppeteer-sharp", innerText);169            Assert.Equal("https://github.com/hardkoded/puppeteer-sharp", url);170            Assert.True(hasContent);171        }172    }173}...

Extensions.cs

Source:Extensions.cs

...13        /// <param name="pageFunction">Function to be evaluated in browser context</param>14        /// <param name="args">Arguments to pass to <c>pageFunction</c></param>15        /// <returns>Task</returns>16        /// <exception cref="SelectorException">If <paramref name="elementHandleTask"/> resolves to <c>null</c></exception>17        public static Task EvaluateFunctionAsync(this Task<ElementHandle> elementHandleTask, string pageFunction, params object[] args)18            => elementHandleTask.EvaluateFunctionAsync<object>(pageFunction, args);19        /// <summary>20        /// Runs <paramref name="pageFunction"/> within the frame and passes it the outcome of <paramref name="elementHandleTask"/> as the first argument21        /// </summary>22        /// <typeparam name="T">The type of the response</typeparam>23        /// <param name="elementHandleTask">A task that returns an <see cref="ElementHandle"/> that will be used as the first argument in <paramref name="pageFunction"/></param>24        /// <param name="pageFunction">Function to be evaluated in browser context</param>25        /// <param name="args">Arguments to pass to <c>pageFunction</c></param>26        /// <returns>Task which resolves to the return value of <c>pageFunction</c></returns>27        /// <exception cref="SelectorException">If <paramref name="elementHandleTask"/> resolves to <c>null</c></exception>28        public static async Task<T> EvaluateFunctionAsync<T>(this Task<ElementHandle> elementHandleTask, string pageFunction, params object[] args)29        {30            var elementHandle = await elementHandleTask.ConfigureAwait(false);31            if (elementHandle == null)32            {33                throw new SelectorException("Error: failed to find element matching selector");34            }35            return await elementHandle.EvaluateFunctionAsync<T>(pageFunction, args).ConfigureAwait(false);36        }37        /// <summary>38        /// Runs <paramref name="pageFunction"/> within the frame and passes it the outcome the <paramref name="elementHandle"/> as the first argument39        /// </summary>40        /// <typeparam name="T">The type of the response</typeparam>41        /// <param name="elementHandle">An <see cref="ElementHandle"/> that will be used as the first argument in <paramref name="pageFunction"/></param>42        /// <param name="pageFunction">Function to be evaluated in browser context</param>43        /// <param name="args">Arguments to pass to <c>pageFunction</c></param>44        /// <returns>Task which resolves to the return value of <c>pageFunction</c></returns>45        /// <exception cref="SelectorException">If <paramref name="elementHandle"/> is <c>null</c></exception>46        public static async Task<T> EvaluateFunctionAsync<T>(this ElementHandle elementHandle, string pageFunction, params object[] args)47        {48            if (elementHandle == null)49            {50                throw new SelectorException("Error: failed to find element matching selector");51            }52            var result = await elementHandle.EvaluateFunctionAsync<T>(pageFunction, args).ConfigureAwait(false);53            await elementHandle.DisposeAsync().ConfigureAwait(false);54            return result;55        }56        /// <summary>57        /// Runs <paramref name="pageFunction"/> within the frame and passes it the outcome of <paramref name="arrayHandleTask"/> as the first argument. Use only after <see cref="Page.QuerySelectorAllHandleAsync(string)"/>58        /// </summary>59        /// <param name="arrayHandleTask">A task that returns an <see cref="JSHandle"/> that represents an array of <see cref="ElementHandle"/> that will be used as the first argument in <paramref name="pageFunction"/></param>60        /// <param name="pageFunction">Function to be evaluated in browser context</param>61        /// <param name="args">Arguments to pass to <c>pageFunction</c></param>62        /// <returns>Task</returns>63        public static Task EvaluateFunctionAsync(this Task<JSHandle> arrayHandleTask, string pageFunction, params object[] args)64            => arrayHandleTask.EvaluateFunctionAsync<object>(pageFunction, args);65        /// <summary>66        /// Runs <paramref name="pageFunction"/> within the frame and passes it the outcome of <paramref name="arrayHandleTask"/> as the first argument. Use only after <see cref="Page.QuerySelectorAllHandleAsync(string)"/>67        /// </summary>68        /// <typeparam name="T"></typeparam>69        /// <param name="arrayHandleTask">A task that returns an <see cref="JSHandle"/> that represents an array of <see cref="ElementHandle"/> that will be used as the first argument in <paramref name="pageFunction"/></param>70        /// <param name="pageFunction">Function to be evaluated in browser context</param>71        /// <param name="args">Arguments to pass to <c>pageFunction</c></param>72        /// <returns>Task which resolves to the return value of <c>pageFunction</c></returns>73        public static async Task<T> EvaluateFunctionAsync<T>(this Task<JSHandle> arrayHandleTask, string pageFunction, params object[] args)74            => await (await arrayHandleTask.ConfigureAwait(false)).EvaluateFunctionAsync<T>(pageFunction, args).ConfigureAwait(false);75        /// <summary>76        /// Runs <paramref name="pageFunction"/> within the frame and passes it the outcome of <paramref name="arrayHandle"/> as the first argument. Use only after <see cref="Page.QuerySelectorAllHandleAsync(string)"/>77        /// </summary>78        /// <typeparam name="T"></typeparam>79        /// <param name="arrayHandle">An <see cref="JSHandle"/> that represents an array of <see cref="ElementHandle"/> that will be used as the first argument in <paramref name="pageFunction"/></param>80        /// <param name="pageFunction">Function to be evaluated in browser context</param>81        /// <param name="args">Arguments to pass to <c>pageFunction</c></param>82        /// <returns>Task which resolves to the return value of <c>pageFunction</c></returns>83        public static async Task<T> EvaluateFunctionAsync<T>(this JSHandle arrayHandle, string pageFunction, params object[] args)84        {85            var result = await arrayHandle.EvaluateFunctionAsync<T>(pageFunction, args).ConfigureAwait(false);86            await arrayHandle.DisposeAsync().ConfigureAwait(false);87            return result;88        }89    }90}

EvaluateTests.cs

Source:EvaluateTests.cs

...23        [InlineData("() => 7 * 3", 21)] //ShouldWork24        [InlineData("() => Promise.resolve(8 * 7)", 56)] //ShouldAwaitPromise25        public async Task BasicIntFunctionEvaluationTest(string script, object expected)26        {27            var result = await Page.EvaluateFunctionAsync<int>(script);28            Assert.Equal(expected, result);29        }30        [Fact]31        public async Task ShouldWorkRightAfterFrameNavigated()32        {33            Task<int> frameEvaluation = null;34            Page.FrameNavigated += (sender, e) =>35            {36                frameEvaluation = e.Frame.EvaluateFunctionAsync<int>("() => 6 * 7");37            };38            await Page.GoToAsync(TestConstants.EmptyPage);39            Assert.Equal(42, await frameEvaluation);40        }41        [Fact]42        public async Task ShouldRejectPromiseWithExeption()43        {44            var exception = await Assert.ThrowsAsync<EvaluationFailedException>(() =>45            {46                return Page.EvaluateFunctionAsync<object>("() => not.existing.object.property");47            });48            Assert.Contains("not is not defined", exception.Message);49        }50        [Fact]51        public async Task SouldReturnComplexObjects()52        {53            dynamic obj = new54            {55                foo = "bar!"56            };57            dynamic result = await Page.EvaluateFunctionAsync("a => a", obj);58            Assert.Equal("bar!", result.foo.ToString());59        }60        [Theory]61        [InlineData("() => NaN", double.NaN)] //ShouldReturnNaN62        [InlineData("() => -0", -0)] //ShouldReturnNegative063        [InlineData("() => Infinity", double.PositiveInfinity)] //ShouldReturnInfinity64        [InlineData("() => -Infinity", double.NegativeInfinity)] //ShouldReturnNegativeInfinty65        public async Task BasicEvaluationTest(string script, object expected)66        {67            dynamic result = await Page.EvaluateFunctionAsync(script);68            Assert.Equal(expected, result);69        }70        [Fact]71        public async Task ShouldAcceptNullAsOneOfMultipleParameters()72        {73            bool result = await Page.EvaluateFunctionAsync<bool>("(a, b) => Object.is(a, null) && Object.is(b, 'foo')", null, "foo");74            Assert.True(result);75        }76        [Fact]77        public async Task ShouldProperlyIgnoreUndefinedFields()78        {79            var result = await Page.EvaluateFunctionAsync<Dictionary<string, object>>("() => ({a: undefined})");80            Assert.Empty(result);81        }82        [Fact]83        public async Task ShouldProperlySerializeNullFields()84        {85            var result = await Page.EvaluateFunctionAsync<Dictionary<string, object>>("() => ({a: null})");86            Assert.True(result.ContainsKey("a"));87            Assert.Null(result["a"]);88        }89        [Fact]90        public async Task ShouldFailForWindowObjectUsingEvaluateExpression()91        {92            var window = await Page.EvaluateExpressionAsync("window");93            Assert.Null(window);94        }95        [Fact]96        public async Task ShouldFailForWindowObjectUsingEvaluateFunction()97        {98            var window = await Page.EvaluateFunctionAsync("() => window");99            Assert.Null(window);100        }101        102        [Fact]103        public async Task ShouldAcceptElementHandleAsAnArgument()104        {105            await Page.SetContentAsync("<section>42</section>");106            var element = await Page.QuerySelectorAsync("section");107            var text = await Page.EvaluateFunctionAsync<string>("e => e.textContent", element);108            Assert.Equal("42", text);109        }110        [Fact]111        public async Task ShouldThrowIfUnderlyingElementWasDisposed()112        {113            await Page.SetContentAsync("<section>39</section>");114            var element = await Page.QuerySelectorAsync("section");115            Assert.NotNull(element);116            await element.DisposeAsync();117            var exception = await Assert.ThrowsAsync<PuppeteerException>(()118                => Page.EvaluateFunctionAsync<string>("e => e.textContent", element));119            Assert.Contains("JSHandle is disposed", exception.Message);120        }121        [Fact]122        public async Task ShouldThrowIfElementHandlesAreFromOtherFrames()123        {124            await FrameUtils.AttachFrameAsync(Page, "frame1", TestConstants.EmptyPage);125            var bodyHandle = await Page.Frames[1].QuerySelectorAsync("body");126            var exception = await Assert.ThrowsAsync<PuppeteerException>(()127                => Page.EvaluateFunctionAsync<string>("body => body.innerHTML", bodyHandle));128            Assert.Contains("JSHandles can be evaluated only in the context they were created", exception.Message);129        }130        [Fact]131        public async Task ShouldAcceptObjectHandleAsAnArgument()132        {133            var navigatorHandle = await Page.EvaluateExpressionHandleAsync("navigator");134            var text = await Page.EvaluateFunctionAsync<string>("e => e.userAgent", navigatorHandle);135            Assert.Contains("Mozilla", text);136        }137        [Fact]138        public async Task ShouldAcceptObjectHandleToPrimitiveTypes()139        {140            var aHandle = await Page.EvaluateExpressionHandleAsync("5");141            var isFive = await Page.EvaluateFunctionAsync<bool>("e => Object.is(e, 5)", aHandle);142            Assert.True(isFive);143        }144        [Fact]145        public async Task ShouldWorkFromInsideAnExposedFunction()146        {147            await Page.ExposeFunctionAsync("callController", async (int a, int b) =>148            {149                return await Page.EvaluateFunctionAsync("(a, b) => a * b", a, b);150            });151            var result = await Page.EvaluateFunctionAsync<int>(@"async function() {152                return await callController(9, 3);153            }");154            Assert.Equal(27, result);155        }156    }157}...

WaitForXPathTests.cs

Source:WaitForXPathTests.cs

...17        public async Task ShouldSupportSomeFancyXpath()18        {19            await Page.SetContentAsync("<p>red herring</p><p>hello  world  </p>");20            var waitForXPath = Page.WaitForXPathAsync("//p[normalize-space(.)=\"hello world\"]");21            Assert.Equal("hello  world  ", await Page.EvaluateFunctionAsync<string>("x => x.textContent", await waitForXPath));22        }23        [Fact]24        public async Task ShouldRunInSpecifiedFrame()25        {26            await FrameUtils.AttachFrameAsync(Page, "frame1", TestConstants.EmptyPage);27            await FrameUtils.AttachFrameAsync(Page, "frame2", TestConstants.EmptyPage);28            var frame1 = Page.Frames.First(f => f.Name == "frame1");29            var frame2 = Page.Frames.First(f => f.Name == "frame2");30            var waitForXPathPromise = frame2.WaitForXPathAsync("//div");31            await frame1.EvaluateFunctionAsync(addElement, "div");32            await frame2.EvaluateFunctionAsync(addElement, "div");33            var eHandle = await waitForXPathPromise;34            Assert.Equal(frame2, eHandle.ExecutionContext.Frame);35        }36        [Fact]37        public async Task ShouldThrowWhenFrameIsDetached()38        {39            await FrameUtils.AttachFrameAsync(Page, "frame1", TestConstants.EmptyPage);40            var frame = Page.FirstChildFrame();41            var waitPromise = frame.WaitForXPathAsync("//*[@class=\"box\"]");42            await FrameUtils.DetachFrameAsync(Page, "frame1");43            var exception = await Assert.ThrowsAnyAsync<Exception>(() => waitPromise);44            Assert.Contains("waitForFunction failed: frame got detached.", exception.Message);45        }46        [Fact]47        public async Task HiddenShouldWaitForDisplayNone()48        {49            var divHidden = false;50            await Page.SetContentAsync("<div style='display: block;'></div>");51            var waitForXPath = Page.WaitForXPathAsync("//div", new WaitForSelectorOptions { Hidden = true })52                .ContinueWith(_ => divHidden = true);53            await Page.WaitForXPathAsync("//div"); // do a round trip54            Assert.False(divHidden);55            await Page.EvaluateExpressionAsync("document.querySelector('div').style.setProperty('display', 'none')");56            Assert.True(await waitForXPath.WithTimeout());57            Assert.True(divHidden);58        }59        [Fact]60        public async Task ShouldReturnTheElementHandle()61        {62            var waitForXPath = Page.WaitForXPathAsync("//*[@class=\"zombo\"]");63            await Page.SetContentAsync("<div class='zombo'>anything</div>");64            Assert.Equal("anything", await Page.EvaluateFunctionAsync<string>("x => x.textContent", await waitForXPath));65        }66        [Fact]67        public async Task ShouldAllowYouToSelectATextNode()68        {69            await Page.SetContentAsync("<div>some text</div>");70            var text = await Page.WaitForXPathAsync("//div/text()");71            Assert.Equal(3 /* Node.TEXT_NODE */, await (await text.GetPropertyAsync("nodeType")).JsonValueAsync<int>());72        }73        [Fact]74        public async Task ShouldAllowYouToSelectAnElementWithSingleSlash()75        {76            await Page.SetContentAsync("<div>some text</div>");77            var waitForXPath = Page.WaitForXPathAsync("/html/body/div");78            Assert.Equal("some text", await Page.EvaluateFunctionAsync<string>("x => x.textContent", await waitForXPath));79        }80        [Fact]81        public async Task ShouldRespectTimeout()82        {83            var exception = await Assert.ThrowsAsync<WaitTaskTimeoutException>(()84                    => Page.WaitForXPathAsync("//div", new WaitForSelectorOptions { Timeout = 10 }));85            Assert.Contains("waiting for XPath '//div' failed: timeout", exception.Message);86        }87    }88}...

FrameUtils.cs

Source:FrameUtils.cs

...6    public static class FrameUtils7    {8        public static async Task AttachFrameAsync(Page page, string frameId, string url)9        {10            await page.EvaluateFunctionAsync(@"(frameId, url) => {11              const frame = document.createElement('iframe');12              frame.src = url;13              frame.id = frameId;14              document.body.appendChild(frame);15              return new Promise(x => frame.onload = x);16            }", frameId, url);17        }18        public static async Task DetachFrameAsync(Page page, string frameId)19        {20            await page.EvaluateFunctionAsync(@"function detachFrame(frameId) {21              const frame = document.getElementById(frameId);22              frame.remove();23            }", frameId);24        }25        public static string DumpFrames(Frame frame, string indentation = "")26        {27            var result = indentation + Regex.Replace(frame.Url, @":\d{4}", ":<PORT>");28            foreach (var child in frame.ChildFrames)29            {30                result += "\n" + DumpFrames(child, "    " + indentation);31            }32            return result;33        }34        internal static async Task NavigateFrameAsync(Page page, string frameId, string url)35        {36            await page.EvaluateFunctionAsync(@"function navigateFrame(frameId, url) {37              const frame = document.getElementById(frameId);38              frame.src = url;39              return new Promise(x => frame.onload = x);40            }", frameId, url);41        }42    }43}...

PuppeteerExtensions.cs

Source:PuppeteerExtensions.cs

...21            return await frame.GetInnerText(element);22        }23        public static async Task<string> GetInnerText(this Frame frame, ElementHandle handle)24        {25            return await frame.EvaluateFunctionAsync<string>("el => el.textContent", handle);26        }27        public static async Task<bool> NavigateAndWait(this Page page, string url)28        {29            try30            {31                return (await page.GoToAsync(url, 15000, new[] { WaitUntilNavigation.Networkidle2 })).Ok;32            }33            catch (System.Exception)34            {35                return false;36            }37        }38    }39}...

EvaluateFunctionAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static void Main(string[] args)7        {8            MainAsync().GetAwaiter().GetResult();9        }10        static async Task MainAsync()11        {12            var options = new LaunchOptions { Headless = false };13            using (var browser = await Puppeteer.LaunchAsync(options))14            using (var page = await browser.NewPageAsync())15            {16                string result = await page.EvaluateFunctionAsync<string>("() => {return 'hello from puppeteer!';}");17                Console.WriteLine(result);18            }19        }20    }21}

EvaluateFunctionAsync

Using AI Code Generation

1var page = await browser.NewPageAsync();2var result = await page.EvaluateFunctionAsync<int>("() => 7 * 3");3var page = await browser.NewPageAsync();4var result = await page.EvaluateFunctionAsync<int>("(a, b) => a * b", 7, 3);5var page = await browser.NewPageAsync();6var result = await page.EvaluateFunctionAsync<int>("(a, b) => a * b", new { a = 7, b = 3 });7var page = await browser.NewPageAsync();8var result = await page.EvaluateFunctionAsync<int>("() => Promise.resolve(7 * 3)");9var page = await browser.NewPageAsync();10var result = await page.EvaluateFunctionAsync<int>("() => Promise.resolve(7 * 3)", new { a = 7, b = 3 });11var page = await browser.NewPageAsync();12var result = await page.EvaluateFunctionAsync<int>("() => Promise.resolve(7 * 3)", new[] { 7, 3 });13var page = await browser.NewPageAsync();

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