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How to use GetExecutionContextAsync method of PuppeteerSharp.Frame class

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

Page.cs

Source:Page.cs

...288        /// </remarks>289        /// <returns>Task which resolves to script return value</returns>290        public async Task<JSHandle> EvaluateExpressionHandleAsync(string script)291        {292            var context = await MainFrame.GetExecutionContextAsync();293            return await context.EvaluateExpressionHandleAsync(script);294        }295        /// <summary>296        /// Executes a script in browser context297        /// </summary>298        /// <param name="pageFunction">Script to be evaluated in browser context</param>299        /// <param name="args">Function arguments</param>300        /// <remarks>301        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.302        /// <see cref="JSHandle"/> instances can be passed as arguments303        /// </remarks>304        /// <returns>Task which resolves to script return value</returns>305        public async Task<JSHandle> EvaluateFunctionHandleAsync(string pageFunction, params object[] args)306        {307            var context = await MainFrame.GetExecutionContextAsync();308            return await context.EvaluateFunctionHandleAsync(pageFunction, args);309        }310        /// <summary>311        /// Adds a function which would be invoked in one of the following scenarios:312        /// - whenever the page is navigated313        /// - whenever the child frame is attached or navigated. In this case, the function is invoked in the context of the newly attached frame314        /// </summary>315        /// <param name="pageFunction">Function to be evaluated in browser context</param>316        /// <param name="args">Arguments to pass to <c>pageFunction</c></param>317        /// <remarks>318        /// The function is invoked after the document was created but before any of its scripts were run. This is useful to amend JavaScript environment, e.g. to seed <c>Math.random</c>.319        /// </remarks>320        /// <example>321        /// An example of overriding the navigator.languages property before the page loads:322        /// <code>323        /// var overrideNavigatorLanguages = @"Object.defineProperty(navigator, 'languages', {324        ///   get: function() {325        ///     return ['en-US', 'en', 'bn'];326        ///   };327        /// });";328        /// await page.EvaluateOnNewDocumentAsync(overrideNavigatorLanguages);329        /// </code>330        /// </example>331        /// <returns>Task</returns>332        public Task EvaluateOnNewDocumentAsync(string pageFunction, params object[] args)333        {334            var source = EvaluationString(pageFunction, args);335            return Client.SendAsync("Page.addScriptToEvaluateOnNewDocument", new { source });336        }337        /// <summary>338        /// The method iterates JavaScript heap and finds all the objects with the given prototype.339        /// Shortcut for <c>page.MainFrame.GetExecutionContextAsync().QueryObjectsAsync(prototypeHandle)</c>.340        /// </summary>341        /// <returns>A task which resolves to a handle to an array of objects with this prototype.</returns>342        /// <param name="prototypeHandle">A handle to the object prototype.</param>343        public async Task<JSHandle> QueryObjectsAsync(JSHandle prototypeHandle)344        {345            var context = await MainFrame.GetExecutionContextAsync();346            return await context.QueryObjectsAsync(prototypeHandle);347        }348        /// <summary>349        /// Activating request interception enables <see cref="Request.AbortAsync(RequestAbortErrorCode)">request.AbortAsync</see>, 350        /// <see cref="Request.ContinueAsync(Payload)">request.ContinueAsync</see> and <see cref="Request.RespondAsync(ResponseData)">request.RespondAsync</see> methods.351        /// </summary>352        /// <returns>The request interception task.</returns>353        /// <param name="value">Whether to enable request interception..</param>354        public Task SetRequestInterceptionAsync(bool value)355            => _networkManager.SetRequestInterceptionAsync(value);356        /// <summary>357        /// Set offline mode for the page.358        /// </summary>359        /// <returns>Result task</returns>...

Frame.cs

Source:Frame.cs

...136        /// <seealso cref="EvaluateFunctionAsync{T}(string, object[])"/>137        /// <seealso cref="Page.EvaluateExpressionAsync{T}(string)"/>138        public async Task<JToken> EvaluateExpressionAsync(string script)139        {140            var context = await GetExecutionContextAsync().ConfigureAwait(false);141            return await context.EvaluateExpressionAsync<JToken>(script).ConfigureAwait(false);142        }143        /// <summary>144        /// Executes a script in browser context145        /// </summary>146        /// <typeparam name="T">The type to deserialize the result to</typeparam>147        /// <param name="script">Script to be evaluated in browser context</param>148        /// <remarks>149        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.150        /// </remarks>151        /// <returns>Task which resolves to script return value</returns>152        /// <seealso cref="EvaluateFunctionAsync{T}(string, object[])"/>153        /// <seealso cref="Page.EvaluateExpressionAsync{T}(string)"/>154        public async Task<T> EvaluateExpressionAsync<T>(string script)155        {156            var context = await GetExecutionContextAsync().ConfigureAwait(false);157            return await context.EvaluateExpressionAsync<T>(script).ConfigureAwait(false);158        }159        /// <summary>160        /// Executes a function in browser context161        /// </summary>162        /// <param name="script">Script to be evaluated in browser context</param>163        /// <param name="args">Arguments to pass to script</param>164        /// <remarks>165        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.166        /// <see cref="JSHandle"/> instances can be passed as arguments167        /// </remarks>168        /// <returns>Task which resolves to script return value</returns>169        /// <seealso cref="EvaluateExpressionAsync{T}(string)"/>170        /// <seealso cref="Page.EvaluateFunctionAsync{T}(string, object[])"/>171        public async Task<JToken> EvaluateFunctionAsync(string script, params object[] args)172        {173            var context = await GetExecutionContextAsync().ConfigureAwait(false);174            return await context.EvaluateFunctionAsync<JToken>(script, args).ConfigureAwait(false);175        }176        /// <summary>177        /// Executes a function in browser context178        /// </summary>179        /// <typeparam name="T">The type to deserialize the result to</typeparam>180        /// <param name="script">Script to be evaluated in browser context</param>181        /// <param name="args">Arguments to pass to script</param>182        /// <remarks>183        /// If the script, returns a Promise, then the method would wait for the promise to resolve and return its value.184        /// <see cref="JSHandle"/> instances can be passed as arguments185        /// </remarks>186        /// <returns>Task which resolves to script return value</returns>187        /// <seealso cref="EvaluateExpressionAsync{T}(string)"/>188        /// <seealso cref="Page.EvaluateFunctionAsync{T}(string, object[])"/>189        public async Task<T> EvaluateFunctionAsync<T>(string script, params object[] args)190        {191            var context = await GetExecutionContextAsync().ConfigureAwait(false);192            return await context.EvaluateFunctionAsync<T>(script, args).ConfigureAwait(false);193        }194        /// <summary>195        /// Passes an expression to the <see cref="ExecutionContext.EvaluateExpressionHandleAsync(string)"/>, returns a <see cref="Task"/>, then <see cref="ExecutionContext.EvaluateExpressionHandleAsync(string)"/> would wait for the <see cref="Task"/> to resolve and return its value.196        /// </summary>197        /// <example>198        /// <code>199        /// var frame = page.MainFrame;200        /// const handle = Page.MainFrame.EvaluateExpressionHandleAsync("1 + 2");201        /// </code>202        /// </example>203        /// <returns>Resolves to the return value of <paramref name="script"/></returns>204        /// <param name="script">Expression to be evaluated in the <seealso cref="ExecutionContext"/></param>205        public async Task<JSHandle> EvaluateExpressionHandleAsync(string script)206        {207            var context = await GetExecutionContextAsync().ConfigureAwait(false);208            return await context.EvaluateExpressionHandleAsync(script).ConfigureAwait(false);209        }210        /// <summary>211        /// Passes a function to the <see cref="ExecutionContext.EvaluateFunctionAsync(string, object[])"/>, returns a <see cref="Task"/>, then <see cref="ExecutionContext.EvaluateFunctionHandleAsync(string, object[])"/> would wait for the <see cref="Task"/> to resolve and return its value.212        /// </summary>213        /// <example>214        /// <code>215        /// var frame = page.MainFrame;216        /// const handle = Page.MainFrame.EvaluateFunctionHandleAsync("() => Promise.resolve(self)");217        /// return handle; // Handle for the global object.218        /// </code>219        /// <see cref="JSHandle"/> instances can be passed as arguments to the <see cref="ExecutionContext.EvaluateFunctionAsync(string, object[])"/>:220        /// 221        /// const handle = await Page.MainFrame.EvaluateExpressionHandleAsync("document.body");222        /// const resultHandle = await Page.MainFrame.EvaluateFunctionHandleAsync("body => body.innerHTML", handle);223        /// return await resultHandle.JsonValueAsync(); // prints body's innerHTML224        /// </example>225        /// <returns>Resolves to the return value of <paramref name="function"/></returns>226        /// <param name="function">Function to be evaluated in the <see cref="ExecutionContext"/></param>227        /// <param name="args">Arguments to pass to <paramref name="function"/></param>228        public async Task<JSHandle> EvaluateFunctionHandleAsync(string function, params object[] args)229        {230            var context = await GetExecutionContextAsync().ConfigureAwait(false);231            return await context.EvaluateFunctionHandleAsync(function, args).ConfigureAwait(false);232        }233        /// <summary>234        /// Gets the <see cref="ExecutionContext"/> associated with the frame.235        /// </summary>236        /// <returns><see cref="ExecutionContext"/> associated with the frame.</returns>237        public Task<ExecutionContext> GetExecutionContextAsync() => _contextResolveTaskWrapper.Task;238        /// <summary>239        /// Waits for a selector to be added to the DOM240        /// </summary>241        /// <param name="selector">A selector of an element to wait for</param>242        /// <param name="options">Optional waiting parameters</param>243        /// <returns>A task that resolves when element specified by selector string is added to DOM</returns>244        /// <seealso cref="WaitForXPathAsync(string, WaitForSelectorOptions)"/>245        /// <seealso cref="Page.WaitForSelectorAsync(string, WaitForSelectorOptions)"/>246        /// <exception cref="WaitTaskTimeoutException">If timeout occurred.</exception>247        public Task<ElementHandle> WaitForSelectorAsync(string selector, WaitForSelectorOptions options = null)248            => WaitForSelectorOrXPathAsync(selector, false, options);249        /// <summary>250        /// Waits for a selector to be added to the DOM251        /// </summary>252        /// <param name="xpath">A xpath selector of an element to wait for</param>253        /// <param name="options">Optional waiting parameters</param>254        /// <returns>A task that resolves when element specified by selector string is added to DOM</returns>255        /// <example>256        /// <code>257        /// <![CDATA[258        /// var browser = await Puppeteer.LaunchAsync(new LaunchOptions());259        /// var page = await browser.NewPageAsync();260        /// string currentURL = null;261        /// page.MainFrame262        ///     .WaitForXPathAsync("//img")263        ///     .ContinueWith(_ => Console.WriteLine("First URL with image: " + currentURL));264        /// foreach (var current in new[] { "https://example.com", "https://google.com", "https://bbc.com" })265        /// {266        ///     currentURL = current;267        ///     await page.GoToAsync(currentURL);268        /// }269        /// await browser.CloseAsync();270        /// ]]>271        /// </code>272        /// </example>273        /// <seealso cref="WaitForSelectorAsync(string, WaitForSelectorOptions)"/>274        /// <seealso cref="Page.WaitForXPathAsync(string, WaitForSelectorOptions)"/>275        /// <exception cref="WaitTaskTimeoutException">If timeout occurred.</exception>276        public Task<ElementHandle> WaitForXPathAsync(string xpath, WaitForSelectorOptions options = null)277            => WaitForSelectorOrXPathAsync(xpath, true, options);278        /// <summary>279        /// Waits for a timeout280        /// </summary>281        /// <param name="milliseconds"></param>282        /// <returns>A task that resolves when after the timeout</returns>283        /// <seealso cref="Page.WaitForTimeoutAsync(int)"/>284        /// <exception cref="WaitTaskTimeoutException">If timeout occurred.</exception>285        public Task WaitForTimeoutAsync(int milliseconds) => Task.Delay(milliseconds);286        /// <summary>287        /// Waits for a function to be evaluated to a truthy value288        /// </summary>289        /// <param name="script">Function to be evaluated in browser context</param>290        /// <param name="options">Optional waiting parameters</param>291        /// <param name="args">Arguments to pass to <c>script</c></param>292        /// <returns>A task that resolves when the <c>script</c> returns a truthy value</returns>293        /// <seealso cref="Page.WaitForFunctionAsync(string, WaitForFunctionOptions, object[])"/>294        /// <exception cref="WaitTaskTimeoutException">If timeout occurred.</exception>295        public Task<JSHandle> WaitForFunctionAsync(string script, WaitForFunctionOptions options, params object[] args)296            => new WaitTask(this, script, false, "function", options.Polling, options.PollingInterval, options.Timeout, args).Task;297        /// <summary>298        /// Waits for an expression to be evaluated to a truthy value299        /// </summary>300        /// <param name="script">Expression to be evaluated in browser context</param>301        /// <param name="options">Optional waiting parameters</param>302        /// <returns>A task that resolves when the <c>script</c> returns a truthy value</returns>303        /// <seealso cref="Page.WaitForExpressionAsync(string, WaitForFunctionOptions)"/>304        /// <exception cref="WaitTaskTimeoutException">If timeout occurred.</exception>305        public Task<JSHandle> WaitForExpressionAsync(string script, WaitForFunctionOptions options)306            => new WaitTask(this, script, true, "function", options.Polling, options.PollingInterval, options.Timeout).Task;307        /// <summary>308        /// Triggers a change and input event once all the provided options have been selected. 309        /// If there's no <![CDATA[<select>]]> element matching selector, the method throws an error.310        /// </summary>311        /// <exception cref="SelectorException">If there's no element matching <paramref name="selector"/></exception>312        /// <param name="selector">A selector to query page for</param>313        /// <param name="values">Values of options to select. If the <![CDATA[<select>]]> has the multiple attribute, 314        /// all values are considered, otherwise only the first one is taken into account.</param>315        /// <returns>Returns an array of option values that have been successfully selected.</returns>316        /// <seealso cref="Page.SelectAsync(string, string[])"/>317        public Task<string[]> SelectAsync(string selector, params string[] values)318            => QuerySelectorAsync(selector).EvaluateFunctionAsync<string[]>(@"(element, values) => {319                if (element.nodeName.toLowerCase() !== 'select')320                    throw new Error('Element is not a <select> element.');321                const options = Array.from(element.options);322                element.value = undefined;323                for (const option of options) {324                    option.selected = values.includes(option.value);325                    if (option.selected && !element.multiple)326                      break;327                }328                element.dispatchEvent(new Event('input', { 'bubbles': true }));329                element.dispatchEvent(new Event('change', { 'bubbles': true }));330                return options.filter(option => option.selected).map(option => option.value);331            }", new[] { values });332        /// <summary>333        /// Queries frame for the selector. If there's no such element within the frame, the method will resolve to <c>null</c>.334        /// </summary>335        /// <param name="selector">Selector to query frame for</param>336        /// <returns>Task which resolves to <see cref="ElementHandle"/> pointing to the frame element</returns>337        /// <seealso cref="Page.QuerySelectorAsync(string)"/>338        public async Task<ElementHandle> QuerySelectorAsync(string selector)339        {340            var document = await GetDocument().ConfigureAwait(false);341            var value = await document.QuerySelectorAsync(selector).ConfigureAwait(false);342            return value;343        }344        /// <summary>345        /// Queries frame for the selector. If no elements match the selector, the return value resolve to <see cref="Array.Empty{T}"/>.346        /// </summary>347        /// <param name="selector">A selector to query frame for</param>348        /// <returns>Task which resolves to ElementHandles pointing to the frame elements</returns>349        /// <seealso cref="Page.QuerySelectorAllAsync(string)"/>350        public async Task<ElementHandle[]> QuerySelectorAllAsync(string selector)351        {352            var document = await GetDocument().ConfigureAwait(false);353            var value = await document.QuerySelectorAllAsync(selector).ConfigureAwait(false);354            return value;355        }356        /// <summary>357        /// Evaluates the XPath expression358        /// </summary>359        /// <param name="expression">Expression to evaluate <see href="https://developer.mozilla.org/en-US/docs/Web/API/Document/evaluate"/></param>360        /// <returns>Task which resolves to an array of <see cref="ElementHandle"/></returns>361        /// <seealso cref="Page.XPathAsync(string)"/>362        public async Task<ElementHandle[]> XPathAsync(string expression)363        {364            var document = await GetDocument().ConfigureAwait(false);365            var value = await document.XPathAsync(expression).ConfigureAwait(false);366            return value;367        }368        /// <summary>369        /// Adds a <c><![CDATA[<link rel="stylesheet">]]></c> tag into the page with the desired url or a <c><![CDATA[<link rel="stylesheet">]]></c> tag with the content370        /// </summary>371        /// <param name="options">add style tag options</param>372        /// <returns>Task which resolves to the added tag when the stylesheet's onload fires or when the CSS content was injected into frame</returns>373        /// <seealso cref="Page.AddStyleTagAsync(AddTagOptions)"/>374        /// <seealso cref="Page.AddStyleTagAsync(string)"/>375        public async Task<ElementHandle> AddStyleTag(AddTagOptions options)376        {377            const string addStyleUrl = @"async function addStyleUrl(url) {378              const link = document.createElement('link');379              link.rel = 'stylesheet';380              link.href = url;381              const promise = new Promise((res, rej) => {382                link.onload = res;383                link.onerror = rej;384              });385              document.head.appendChild(link);386              await promise;387              return link;388            }";389            const string addStyleContent = @"async function addStyleContent(content) {390              const style = document.createElement('style');391              style.type = 'text/css';392              style.appendChild(document.createTextNode(content));393              const promise = new Promise((res, rej) => {394                style.onload = res;395                style.onerror = rej;396              });397              document.head.appendChild(style);398              await promise;399              return style;400            }";401            if (!string.IsNullOrEmpty(options.Url))402            {403                var url = options.Url;404                try405                {406                    var context = await GetExecutionContextAsync().ConfigureAwait(false);407                    return (await context.EvaluateFunctionHandleAsync(addStyleUrl, url).ConfigureAwait(false)) as ElementHandle;408                }409                catch (PuppeteerException)410                {411                    throw new PuppeteerException($"Loading style from {url} failed");412                }413            }414            if (!string.IsNullOrEmpty(options.Path))415            {416                var contents = await AsyncFileHelper.ReadAllText(options.Path).ConfigureAwait(false);417                contents += "//# sourceURL=" + options.Path.Replace("\n", string.Empty);418                var context = await GetExecutionContextAsync().ConfigureAwait(false);419                return (await context.EvaluateFunctionHandleAsync(addStyleContent, contents).ConfigureAwait(false)) as ElementHandle;420            }421            if (!string.IsNullOrEmpty(options.Content))422            {423                var context = await GetExecutionContextAsync().ConfigureAwait(false);424                return (await context.EvaluateFunctionHandleAsync(addStyleContent, options.Content).ConfigureAwait(false)) as ElementHandle;425            }426            throw new ArgumentException("Provide options with a `Url`, `Path` or `Content` property");427        }428        /// <summary>429        /// Adds a <c><![CDATA[<script>]]></c> tag into the page with the desired url or content430        /// </summary>431        /// <param name="options">add script tag options</param>432        /// <returns>Task which resolves to the added tag when the script's onload fires or when the script content was injected into frame</returns>433        /// <seealso cref="Page.AddScriptTagAsync(AddTagOptions)"/>434        /// <seealso cref="Page.AddScriptTagAsync(string)"/>435        public async Task<ElementHandle> AddScriptTag(AddTagOptions options)436        {437            const string addScriptUrl = @"async function addScriptUrl(url, type) {438              const script = document.createElement('script');439              script.src = url;440              if(type)441                script.type = type;442              const promise = new Promise((res, rej) => {443                script.onload = res;444                script.onerror = rej;445              });446              document.head.appendChild(script);447              await promise;448              return script;449            }";450            const string addScriptContent = @"function addScriptContent(content, type = 'text/javascript') {451              const script = document.createElement('script');452              script.type = type;453              script.text = content;454              let error = null;455              script.onerror = e => error = e;456              document.head.appendChild(script);457              if (error)458                throw error;459              return script;460            }";461            async Task<ElementHandle> AddScriptTagPrivate(string script, string urlOrContent, string type)462            {463                var context = await GetExecutionContextAsync().ConfigureAwait(false);464                return (string.IsNullOrEmpty(type)465                        ? await context.EvaluateFunctionHandleAsync(script, urlOrContent).ConfigureAwait(false)466                        : await context.EvaluateFunctionHandleAsync(script, urlOrContent, type).ConfigureAwait(false)) as ElementHandle;467            }468            if (!string.IsNullOrEmpty(options.Url))469            {470                var url = options.Url;471                try472                {473                    return await AddScriptTagPrivate(addScriptUrl, url, options.Type).ConfigureAwait(false);474                }475                catch (PuppeteerException)476                {477                    throw new PuppeteerException($"Loading script from {url} failed");478                }479            }480            if (!string.IsNullOrEmpty(options.Path))481            {482                var contents = await AsyncFileHelper.ReadAllText(options.Path).ConfigureAwait(false);483                contents += "//# sourceURL=" + options.Path.Replace("\n", string.Empty);484                return await AddScriptTagPrivate(addScriptContent, contents, options.Type).ConfigureAwait(false);485            }486            if (!string.IsNullOrEmpty(options.Content))487            {488                return await AddScriptTagPrivate(addScriptContent, options.Content, options.Type).ConfigureAwait(false);489            }490            throw new ArgumentException("Provide options with a `Url`, `Path` or `Content` property");491        }492        /// <summary>493        /// Gets the full HTML contents of the page, including the doctype.494        /// </summary>495        /// <returns>Task which resolves to the HTML content.</returns>496        /// <seealso cref="Page.GetContentAsync"/>497        public Task<string> GetContentAsync()498            => EvaluateFunctionAsync<string>(@"() => {499                let retVal = '';500                if (document.doctype)501                    retVal = new XMLSerializer().serializeToString(document.doctype);502                if (document.documentElement)503                    retVal += document.documentElement.outerHTML;504                return retVal;505            }");506        /// <summary>507        /// Sets the HTML markup to the page508        /// </summary>509        /// <param name="html">HTML markup to assign to the page.</param>510        /// <returns>Task.</returns>511        /// <seealso cref="Page.SetContentAsync(string)"/>512        public Task SetContentAsync(string html)513            => EvaluateFunctionAsync(@"html => {514                document.open();515                document.write(html);516                document.close();517            }", html);518        /// <summary>519        /// Returns page's title520        /// </summary>521        /// <returns>page's title</returns>522        /// <seealso cref="Page.GetTitleAsync"/>523        public Task<string> GetTitleAsync() => EvaluateExpressionAsync<string>("document.title");524        internal async Task<ElementHandle> WaitForSelectorOrXPathAsync(string selectorOrXPath, bool isXPath, WaitForSelectorOptions options = null)525        {526            options = options ?? new WaitForSelectorOptions();527            const string predicate = @"528              function predicate(selectorOrXPath, isXPath, waitForVisible, waitForHidden) {529                const node = isXPath530                  ? document.evaluate(selectorOrXPath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue531                  : document.querySelector(selectorOrXPath);532                if (!node)533                  return waitForHidden;534                if (!waitForVisible && !waitForHidden)535                  return node;536                const element = node.nodeType === Node.TEXT_NODE ? node.parentElement : node;537                const style = window.getComputedStyle(element);538                const isVisible = style && style.visibility !== 'hidden' && hasVisibleBoundingBox();539                const success = (waitForVisible === isVisible || waitForHidden === !isVisible);540                return success ? node : null;541                function hasVisibleBoundingBox() {542                  const rect = element.getBoundingClientRect();543                  return !!(rect.top || rect.bottom || rect.width || rect.height);544                }545              }";546            var polling = options.Visible || options.Hidden ? WaitForFunctionPollingOption.Raf : WaitForFunctionPollingOption.Mutation;547            var handle = await new WaitTask(548                this,549                predicate,550                false,551                $"{(isXPath ? "XPath" : "selector")} '{selectorOrXPath}'{(options.Hidden ? " to be hidden" : "")}",552                options.Polling,553                options.PollingInterval,554                options.Timeout,555                new object[]556                {557                    selectorOrXPath,558                    isXPath,559                    options.Visible,560                    options.Hidden561                }).Task.ConfigureAwait(false);562            return handle as ElementHandle;563        }564        internal void OnLoadingStopped()565        {566            LifecycleEvents.Add("DOMContentLoaded");567            LifecycleEvents.Add("load");568        }569        internal void OnLifecycleEvent(string loaderId, string name)570        {571            if (name == "init")572            {573                LoaderId = loaderId;574                LifecycleEvents.Clear();575            }576            LifecycleEvents.Add(name);577        }578        internal void Navigated(FramePayload framePayload)579        {580            Name = framePayload.Name ?? string.Empty;581            NavigationURL = framePayload.Url;582            Url = framePayload.Url;583        }584        internal void NavigatedWithinDocument(string url) => Url = url;585        internal void SetDefaultContext(ExecutionContext context)586        {587            if (context != null)588            {589                _contextResolveTaskWrapper.SetResult(context);590                foreach (var waitTask in WaitTasks)591                {592                    _ = waitTask.Rerun();593                }594            }595            else596            {597                _documentCompletionSource = null;598                _contextResolveTaskWrapper = new TaskCompletionSource<ExecutionContext>();599            }600        }601        internal void Detach()602        {603            while (WaitTasks.Count > 0)604            {605                WaitTasks[0].Terminate(new Exception("waitForFunction failed: frame got detached."));606            }607            Detached = true;608            if (ParentFrame != null)609            {610                ParentFrame.ChildFrames.Remove(this);611            }612            ParentFrame = null;613        }614        #endregion615        #region Private Methods616        private async Task<ElementHandle> GetDocument()617        {618            if (_documentCompletionSource == null)619            {620                _documentCompletionSource = new TaskCompletionSource<ElementHandle>();621                var context = await GetExecutionContextAsync().ConfigureAwait(false);622                var document = await context.EvaluateExpressionHandleAsync("document").ConfigureAwait(false);623                _documentCompletionSource.SetResult(document as ElementHandle);624            }625            return await _documentCompletionSource.Task.ConfigureAwait(false);626        }627        #endregion628    }629}...

PageEvaluateTests.cs

Source:PageEvaluateTests.cs

...272        [PuppeteerTest("evaluation.spec.ts", "Page.evaluate", "should throw a nice error after a navigation")]273        [SkipBrowserFact(skipFirefox: true)]274        public async Task ShouldThrowANiceErrorAfterANavigation()275        {276            var executionContext = await Page.MainFrame.GetExecutionContextAsync();277            await Task.WhenAll(278                Page.WaitForNavigationAsync(),279                executionContext.EvaluateFunctionAsync("() => window.location.reload()")280            );281            var ex = await Assert.ThrowsAsync<EvaluationFailedException>(() =>282            {283                return executionContext.EvaluateFunctionAsync("() => null");284            });285            Assert.Contains("navigation", ex.Message);286        }287        [PuppeteerTest("evaluation.spec.ts", "Page.evaluate", "should not throw an error when evaluation does a navigation")]288        [SkipBrowserFact(skipFirefox: true)]289        public async Task ShouldNotThrowAnErrorWhenEvaluationDoesANavigation()290        {...

EvaluateTests.cs

Source:EvaluateTests.cs

...232            }"));233        [Fact]234        public async Task ShouldThrowANiceErrorAfterANavigation()235        {236            var executionContext = await Page.MainFrame.GetExecutionContextAsync();237            await Task.WhenAll(238                Page.WaitForNavigationAsync(),239                executionContext.EvaluateFunctionAsync("() => window.location.reload()")240            );241            var ex = await Assert.ThrowsAsync<EvaluationFailedException>(() =>242            {243                return executionContext.EvaluateFunctionAsync("() => null");244            });245            Assert.Contains("navigation", ex.Message);246        }247        [Fact]248        public async Task ShouldNotThrowAnErrorWhenEvaluationDoesANavigation()249        {250            await Page.GoToAsync(TestConstants.ServerUrl + "/one-style.html");...

DOMWorld.cs

Source:DOMWorld.cs

...47            {48                WaitTasks[0].Terminate(new Exception("waitForFunction failed: frame got detached."));49            }50        }51        internal Task<ExecutionContext> GetExecutionContextAsync()52        {53            if (_detached)54            {55                throw new PuppeteerException($"Execution Context is not available in detached frame \"{Frame.Url}\"(are you trying to evaluate?)");56            }57            return _contextResolveTaskWrapper.Task;58        }59        internal async Task<JSHandle> EvaluateExpressionHandleAsync(string script)60        {61            var context = await GetExecutionContextAsync().ConfigureAwait(false);62            return await context.EvaluateExpressionHandleAsync(script).ConfigureAwait(false);63        }64        internal async Task<JSHandle> EvaluateFunctionHandleAsync(string script, params object[] args)65        {66            var context = await GetExecutionContextAsync().ConfigureAwait(false);67            return await context.EvaluateFunctionHandleAsync(script, args).ConfigureAwait(false);68        }69        internal async Task<T> EvaluateExpressionAsync<T>(string script)70        {71            var context = await GetExecutionContextAsync().ConfigureAwait(false);72            return await context.EvaluateExpressionAsync<T>(script).ConfigureAwait(false);73        }74        internal async Task<JToken> EvaluateExpressionAsync(string script)75        {76            var context = await GetExecutionContextAsync().ConfigureAwait(false);77            return await context.EvaluateExpressionAsync(script).ConfigureAwait(false);78        }79        internal async Task<T> EvaluateFunctionAsync<T>(string script, params object[] args)80        {81            var context = await GetExecutionContextAsync().ConfigureAwait(false);82            return await context.EvaluateFunctionAsync<T>(script, args).ConfigureAwait(false);83        }84        internal async Task<JToken> EvaluateFunctionAsync(string script, params object[] args)85        {86            var context = await GetExecutionContextAsync().ConfigureAwait(false);87            return await context.EvaluateFunctionAsync(script, args).ConfigureAwait(false);88        }89        internal Task<string> GetContentAsync() => EvaluateFunctionAsync<string>(@"() => {90                let retVal = '';91                if (document.doctype)92                    retVal = new XMLSerializer().serializeToString(document.doctype);93                if (document.documentElement)94                    retVal += document.documentElement.outerHTML;95                return retVal;96            }");97        internal async Task SetContentAsync(string html, NavigationOptions options = null)98        {99            var waitUntil = options?.WaitUntil ?? new[] { WaitUntilNavigation.Load };100            var timeout = options?.Timeout ?? _timeoutSettings.NavigationTimeout;101            // We rely upon the fact that document.open() will reset frame lifecycle with "init"102            // lifecycle event. @see https://crrev.com/608658103            await EvaluateFunctionAsync(@"html => {104                document.open();105                document.write(html);106                document.close();107            }", html).ConfigureAwait(false);108            using (var watcher = new LifecycleWatcher(_frameManager, Frame, waitUntil, timeout))109            {110                var watcherTask = await Task.WhenAny(111                    watcher.TimeoutOrTerminationTask,112                    watcher.LifecycleTask).ConfigureAwait(false);113                await watcherTask.ConfigureAwait(false);114            }115        }116        internal async Task<ElementHandle> AddScriptTagAsync(AddTagOptions options)117        {118            const string addScriptUrl = @"async function addScriptUrl(url, type) {119              const script = document.createElement('script');120              script.src = url;121              if(type)122                script.type = type;123              const promise = new Promise((res, rej) => {124                script.onload = res;125                script.onerror = rej;126              });127              document.head.appendChild(script);128              await promise;129              return script;130            }";131            const string addScriptContent = @"function addScriptContent(content, type = 'text/javascript') {132              const script = document.createElement('script');133              script.type = type;134              script.text = content;135              let error = null;136              script.onerror = e => error = e;137              document.head.appendChild(script);138              if (error)139                throw error;140              return script;141            }";142            async Task<ElementHandle> AddScriptTagPrivate(string script, string urlOrContent, string type)143            {144                var context = await GetExecutionContextAsync().ConfigureAwait(false);145                return (string.IsNullOrEmpty(type)146                        ? await context.EvaluateFunctionHandleAsync(script, urlOrContent).ConfigureAwait(false)147                        : await context.EvaluateFunctionHandleAsync(script, urlOrContent, type).ConfigureAwait(false)) as ElementHandle;148            }149            if (!string.IsNullOrEmpty(options.Url))150            {151                var url = options.Url;152                try153                {154                    return await AddScriptTagPrivate(addScriptUrl, url, options.Type).ConfigureAwait(false);155                }156                catch (PuppeteerException)157                {158                    throw new PuppeteerException($"Loading script from {url} failed");159                }160            }161            if (!string.IsNullOrEmpty(options.Path))162            {163                var contents = await AsyncFileHelper.ReadAllText(options.Path).ConfigureAwait(false);164                contents += "//# sourceURL=" + options.Path.Replace("\n", string.Empty);165                return await AddScriptTagPrivate(addScriptContent, contents, options.Type).ConfigureAwait(false);166            }167            if (!string.IsNullOrEmpty(options.Content))168            {169                return await AddScriptTagPrivate(addScriptContent, options.Content, options.Type).ConfigureAwait(false);170            }171            throw new ArgumentException("Provide options with a `Url`, `Path` or `Content` property");172        }173        internal async Task<ElementHandle> AddStyleTagAsync(AddTagOptions options)174        {175            const string addStyleUrl = @"async function addStyleUrl(url) {176              const link = document.createElement('link');177              link.rel = 'stylesheet';178              link.href = url;179              const promise = new Promise((res, rej) => {180                link.onload = res;181                link.onerror = rej;182              });183              document.head.appendChild(link);184              await promise;185              return link;186            }";187            const string addStyleContent = @"async function addStyleContent(content) {188              const style = document.createElement('style');189              style.type = 'text/css';190              style.appendChild(document.createTextNode(content));191              const promise = new Promise((res, rej) => {192                style.onload = res;193                style.onerror = rej;194              });195              document.head.appendChild(style);196              await promise;197              return style;198            }";199            if (!string.IsNullOrEmpty(options.Url))200            {201                var url = options.Url;202                try203                {204                    var context = await GetExecutionContextAsync().ConfigureAwait(false);205                    return (await context.EvaluateFunctionHandleAsync(addStyleUrl, url).ConfigureAwait(false)) as ElementHandle;206                }207                catch (PuppeteerException)208                {209                    throw new PuppeteerException($"Loading style from {url} failed");210                }211            }212            if (!string.IsNullOrEmpty(options.Path))213            {214                var contents = await AsyncFileHelper.ReadAllText(options.Path).ConfigureAwait(false);215                contents += "//# sourceURL=" + options.Path.Replace("\n", string.Empty);216                var context = await GetExecutionContextAsync().ConfigureAwait(false);217                return (await context.EvaluateFunctionHandleAsync(addStyleContent, contents).ConfigureAwait(false)) as ElementHandle;218            }219            if (!string.IsNullOrEmpty(options.Content))220            {221                var context = await GetExecutionContextAsync().ConfigureAwait(false);222                return (await context.EvaluateFunctionHandleAsync(addStyleContent, options.Content).ConfigureAwait(false)) as ElementHandle;223            }224            throw new ArgumentException("Provide options with a `Url`, `Path` or `Content` property");225        }226        internal Task<ElementHandle> WaitForSelectorAsync(string selector, WaitForSelectorOptions options = null)227            => WaitForSelectorOrXPathAsync(selector, false, options);228        internal Task<ElementHandle> WaitForXPathAsync(string xpath, WaitForSelectorOptions options = null)229            => WaitForSelectorOrXPathAsync(xpath, true, options);230        internal Task<JSHandle> WaitForFunctionAsync(string script, WaitForFunctionOptions options, params object[] args)231            => new WaitTask(232                this,233                script,234                false,235                "function",236                options.Polling,237                options.PollingInterval,238                options.Timeout ?? _timeoutSettings.Timeout,239                args).Task;240        internal Task<JSHandle> WaitForExpressionAsync(string script, WaitForFunctionOptions options)241            => new WaitTask(242                this,243                script,244                true,245                "function",246                options.Polling,247                options.PollingInterval,248                options.Timeout ?? _timeoutSettings.Timeout).Task;249        internal Task<string> GetTitleAsync() => EvaluateExpressionAsync<string>("document.title");250        private async Task<ElementHandle> GetDocument()251        {252            if (_documentCompletionSource == null)253            {254                _documentCompletionSource = new TaskCompletionSource<ElementHandle>(TaskCreationOptions.RunContinuationsAsynchronously);255                var context = await GetExecutionContextAsync().ConfigureAwait(false);256                var document = await context.EvaluateExpressionHandleAsync("document").ConfigureAwait(false);257                _documentCompletionSource.TrySetResult(document as ElementHandle);258            }259            return await _documentCompletionSource.Task.ConfigureAwait(false);260        }261        private async Task<ElementHandle> WaitForSelectorOrXPathAsync(string selectorOrXPath, bool isXPath, WaitForSelectorOptions options = null)262        {263            options = options ?? new WaitForSelectorOptions();264            var timeout = options.Timeout ?? _timeoutSettings.Timeout;265            const string predicate = @"266              function predicate(selectorOrXPath, isXPath, waitForVisible, waitForHidden) {267                const node = isXPath268                  ? document.evaluate(selectorOrXPath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue269                  : document.querySelector(selectorOrXPath);...

WaitTask.cs

Source:WaitTask.cs

...139        {140            var runCount = Interlocked.Increment(ref _runCount);141            JSHandle success = null;142            Exception exception = null;143            var context = await _frame.GetExecutionContextAsync().ConfigureAwait(false);144            try145            {146                success = await context.EvaluateFunctionHandleAsync(WaitForPredicatePageFunction,147                    new object[] { _predicateBody, _pollingInterval ?? (object)_polling, _timeout }.Concat(_args).ToArray()).ConfigureAwait(false);148            }149            catch (Exception ex)150            {151                exception = ex;152            }153            if (_terminated || runCount != _runCount)154            {155                if (success != null)156                {157                    await success.DisposeAsync().ConfigureAwait(false);...

ExecutionContextTests.cs

Source:ExecutionContextTests.cs

...14        {15            await Page.GoToAsync(TestConstants.EmptyPage);16            await FrameUtils.AttachFrameAsync(Page, "frame1", TestConstants.EmptyPage);17            Assert.Equal(2, Page.Frames.Length);18            var context1 = await Page.MainFrame.GetExecutionContextAsync();19            var context2 = await Page.FirstChildFrame().GetExecutionContextAsync();20            Assert.NotNull(context1);21            Assert.NotNull(context2);22            Assert.NotEqual(context1, context2);23            Assert.Equal(Page.MainFrame, context1.Frame);24            Assert.Equal(Page.FirstChildFrame(), context2.Frame);25            await Task.WhenAll(26                context1.EvaluateExpressionAsync("window.a = 1"),27                context2.EvaluateExpressionAsync("window.a = 2")28            );29            var a1 = context1.EvaluateExpressionAsync<int>("window.a");30            var a2 = context2.EvaluateExpressionAsync<int>("window.a");31            await Task.WhenAll(a1, a2);32            Assert.Equal(1, a1.Result);33            Assert.Equal(2, a2.Result);...

ContextTests.cs

Source:ContextTests.cs

...14        {15            await Page.GoToAsync(TestConstants.EmptyPage);16            await FrameUtils.AttachFrameAsync(Page, "frame1", TestConstants.EmptyPage);17            Assert.Equal(2, Page.Frames.Length);18            var context1 = await Page.Frames[0].GetExecutionContextAsync();19            var context2 = await Page.Frames[1].GetExecutionContextAsync();20            Assert.NotNull(context1);21            Assert.NotNull(context2);22            Assert.NotEqual(context1, context2);23            await Task.WhenAll(24                context1.EvaluateExpressionAsync("window.a = 1"),25                context2.EvaluateExpressionAsync("window.a = 2")26            );27            var a1 = context1.EvaluateExpressionAsync<int>("window.a");28            var a2 = context2.EvaluateExpressionAsync<int>("window.a");29            await Task.WhenAll(a1, a2);30            Assert.Equal(1, a1.Result);31            Assert.Equal(2, a2.Result);32        }33    }...

GetExecutionContextAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);9            var browser = await Puppeteer.LaunchAsync(new LaunchOptions10            {11            });12            var page = await browser.NewPageAsync();13            var context = await page.GetExecutionContextAsync();14            var result = await context.EvaluateFunctionAsync<string>("() => { return \"Hello world!\"; }");15            Console.WriteLine(result);16            await browser.CloseAsync();17        }18    }19}

GetExecutionContextAsync

Using AI Code Generation

1var frame = await page.GetMainFrameAsync();2var context = await frame.GetExecutionContextAsync();3var context = await page.GetExecutionContextAsync();4var context = await elementHandle.GetExecutionContextAsync();5var frame = await page.GetMainFrameAsync();6var context = await frame.GetExecutionContextAsync();7var context = await page.GetExecutionContextAsync();8var context = await elementHandle.GetExecutionContextAsync();9var frame = await page.GetMainFrameAsync();10var context = await frame.GetExecutionContextAsync();11var context = await page.GetExecutionContextAsync();12var context = await elementHandle.GetExecutionContextAsync();13var frame = await page.GetMainFrameAsync();14var context = await frame.GetExecutionContextAsync();15var context = await page.GetExecutionContextAsync();16var context = await elementHandle.GetExecutionContextAsync();17var frame = await page.GetMainFrameAsync();18var context = await frame.GetExecutionContextAsync();19var context = await page.GetExecutionContextAsync();20var context = await elementHandle.GetExecutionContextAsync();21var frame = await page.GetMainFrameAsync();22var context = await frame.GetExecutionContextAsync();23var context = await page.GetExecutionContextAsync();

GetExecutionContextAsync

Using AI Code Generation

1var page = await browser.NewPageAsync();2var frame = await page.GetMainFrameAsync();3var context = await frame.GetExecutionContextAsync();4var result = await context.EvaluateFunctionAsync<int>("() => 7 * 3");5var page = await browser.NewPageAsync();6var frame = await page.GetMainFrameAsync();7var context = await frame.GetExecutionContextAsync();8var result = await context.EvaluateFunctionAsync<int>("() => 7 * 3");9var page = await browser.NewPageAsync();10var frame = await page.GetMainFrameAsync();11var context = await frame.GetExecutionContextAsync();12var result = await context.EvaluateFunctionAsync<int>("() => 7 * 3");13var page = await browser.NewPageAsync();14var frame = await page.GetMainFrameAsync();15var context = await frame.GetExecutionContextAsync();16var result = await context.EvaluateFunctionAsync<int>("() => 7 * 3");17var page = await browser.NewPageAsync();18var frame = await page.GetMainFrameAsync();19var context = await frame.GetExecutionContextAsync();20var result = await context.EvaluateFunctionAsync<int>("() => 7 * 3");21var page = await browser.NewPageAsync();22var frame = await page.GetMainFrameAsync();23var context = await frame.GetExecutionContextAsync();24var result = await context.EvaluateFunctionAsync<int>("() => 7 * 3");

GetExecutionContextAsync

Using AI Code Generation

1var executionContext = await frame.GetExecutionContextAsync();2var result = await executionContext.EvaluateFunctionAsync<int>("() => 7 * 3");3var executionContext = await page.GetExecutionContextAsync();4var result = await executionContext.EvaluateFunctionAsync<int>("() => 7 * 3");5var executionContext = await frame.GetExecutionContextAsync();6var result = await executionContext.EvaluateExpressionAsync<int>("7 * 3");7var executionContext = await page.GetExecutionContextAsync();8var result = await executionContext.EvaluateExpressionAsync<int>("7 * 3");9var executionContext = await frame.GetExecutionContextAsync();10var result = await executionContext.EvaluateFunctionHandleAsync("() => document.body");11var executionContext = await page.GetExecutionContextAsync();12var result = await executionContext.EvaluateFunctionHandleAsync("() => document.body");13var executionContext = await frame.GetExecutionContextAsync();14var result = await executionContext.EvaluateExpressionHandleAsync("document.body");15var executionContext = await page.GetExecutionContextAsync();16var result = await executionContext.EvaluateExpressionHandleAsync("document.body");17var executionContext = await frame.GetExecutionContextAsync();18var result = await executionContext.EvaluateAsync("() => 7 * 3");

GetExecutionContextAsync

Using AI Code Generation

1var page = await browser.NewPageAsync();2var frame = page.MainFrame;3var context = await frame.GetExecutionContextAsync();4var result = await context.EvaluateExpressionAsync<int>("document.body.childElementCount");5Console.WriteLine(result);6var page = await browser.NewPageAsync();7var frame = page.MainFrame;8var context = await frame.GetExecutionContextAsync();9var result = await context.EvaluateExpressionAsync<int>("document.body.childElementCount");10Console.WriteLine(result);11var page = await browser.NewPageAsync();12var frame = page.MainFrame;13var context = await frame.GetExecutionContextAsync();14var result = await context.EvaluateExpressionAsync<int>("document.body.childElementCount");15Console.WriteLine(result);16var page = await browser.NewPageAsync();17var frame = page.MainFrame;18var context = await frame.GetExecutionContextAsync();19var result = await context.EvaluateExpressionAsync<int>("document.body.childElementCount");20Console.WriteLine(result);21var page = await browser.NewPageAsync();22var frame = page.MainFrame;23var context = await frame.GetExecutionContextAsync();24var result = await context.EvaluateExpressionAsync<int>("document.body.childElementCount");25Console.WriteLine(result);26var page = await browser.NewPageAsync();

GetExecutionContextAsync

Using AI Code Generation

1var frame = await page.GetMainFrameAsync();2var context = await frame.GetExecutionContextAsync();3var result = await context.EvaluateFunctionAsync<int>("() => 8 * 7");4var frame = await page.GetMainFrameAsync();5var context = await frame.GetExecutionContextAsync();6var result = await context.EvaluateFunctionAsync<int>("() => 8 * 7");7var frame = await page.GetMainFrameAsync();8var context = await frame.GetExecutionContextAsync();9var result = await context.EvaluateFunctionAsync<int>("() => 8 * 7");10var frame = await page.GetMainFrameAsync();11var context = await frame.GetExecutionContextAsync();12var result = await context.EvaluateFunctionAsync<int>("() => 8 * 7");13var frame = await page.GetMainFrameAsync();14var context = await frame.GetExecutionContextAsync();15var result = await context.EvaluateFunctionAsync<int>("() => 8 * 7");16var frame = await page.GetMainFrameAsync();17var context = await frame.GetExecutionContextAsync();18var result = await context.EvaluateFunctionAsync<int>("() => 8 * 7");19var frame = await page.GetMainFrameAsync();20var context = await frame.GetExecutionContextAsync();21var result = await context.EvaluateFunctionAsync<int>("() => 8 * 7");22var frame = await page.GetMainFrameAsync();23var context = await frame.GetExecutionContextAsync();24var result = await context.EvaluateFunctionAsync<int>("()

GetExecutionContextAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            var options = new LaunchOptions { Headless = true };9            using (var browser = await Puppeteer.LaunchAsync(options))10            using (var page = await browser.NewPageAsync())11            {12                var executionContext = await page.GetExecutionContextAsync();13                var result = await executionContext.EvaluateExpressionAsync<int>("1+1");14                Console.WriteLine(result);15            }16        }17    }18}

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