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How to use XPathAsync method of PuppeteerSharp.ElementHandle class

Best Puppeteer-sharp code snippet using PuppeteerSharp.ElementHandle.XPathAsync

Program.cs

Source:Program.cs

...108109        public static async Task<string[]> GetAllCurrencies(Page page)110        {111            await page.WaitForSelectorAsync("#pjname");112            var elementHandles = await page.XPathAsync($"//select[@id=\"pjname\"]/option[position()>1]");113            //var all_currencies = await page.EvaluateExpressionAsync<string[]>("Array.from(document.querySelectorAll('option')).map(option => option.value);");114            if (elementHandles.Length == 0)115            {116                throw new Exception("No currencies available");117            }118            var all_currencies = await ElementHandlesToArrayOfStrings(elementHandles, "value");119            return all_currencies;120        }121122        public static async Task<string[]> ElementHandlesToArrayOfStrings(ElementHandle[] elementHandles, string property)123        {124            string[] return_value = new string[elementHandles.Length];125            int i = 0;126            foreach (var data in elementHandles)127            {128                var jsHandle = await data.GetPropertyAsync(property);129                string data_value = await jsHandle.JsonValueAsync<string>();130                return_value[i++] = data_value;131            }132133            return return_value;134        }135136        public static async Task<bool> SearchDataForCurrency(Page page, string url, string date1, string date2, string currency)137        {138            //await page.GoToAsync(url);139            await page.WaitForSelectorAsync("input[type='text'][name='erectDate']");140            await page.ClickAsync("input[type='text'][name='erectDate']", new PuppeteerSharp.Input.ClickOptions { ClickCount = 3 });141            await page.TypeAsync("input[type='text'][name='erectDate']", date1);142143            await page.WaitForSelectorAsync("input[type='text'][name='nothing']");144            await page.ClickAsync("input[type = 'text'][name = 'nothing']", new PuppeteerSharp.Input.ClickOptions { ClickCount = 3 });145            await page.TypeAsync("input[type='text'][name='nothing']", date2);146147            await page.WaitForSelectorAsync("#pjname");148            await page.SelectAsync("#pjname", currency);149150            await page.WaitForSelectorAsync("input[type='button'][value='search']");151            await page.ClickAsync("input[type='button'][value='search']");152153            bool data_exist = await WaitForSearchingToComplete(page);154            return data_exist;155        }156157        public static async Task<bool> WaitForSearchingToComplete(Page page)158        {159            bool data_exist = false;160            bool loaded = false;161            while (!loaded)162            {163                await page.WaitForSelectorAsync(".hui12_20");164                var elementHandles = await page.XPathAsync($"//td[@class=\"hui12_20\"][text()=\"soryy,wrong search word submit,please check your search word!\"]");165                var search_failed_msg = await ElementHandlesToArrayOfStrings(elementHandles, "innerHTML");166                if (search_failed_msg.Length == 0)167                {168                    loaded = true;169                    await page.WaitForSelectorAsync(".hui12_20");170                    var elementHandles2 = await page.XPathAsync($"//td[@class=\"hui12_20\"][text()=\"sorry, no recordsï¼\"]");171                    var no_records_msg = await ElementHandlesToArrayOfStrings(elementHandles2, "innerHTML");172                    if (no_records_msg.Length == 0)173                    {174                        data_exist = true;175                    }176                }177                else178                {179                    Console.WriteLine("Website isn't behaving as expected, this may take a while...");180                    await page.WaitForSelectorAsync("input[type='button'][value='search']");181                    await page.ClickAsync("input[type='button'][value='search']");182                }183            }184            return data_exist;185        }186187        public static async Task<string[]> GetCurrencyDataHeader(Page page)188        {189            var elementHandles = await page.XPathAsync($"//td[@class=\"lan12_hover\"][text()]");190            var header = await ElementHandlesToArrayOfStrings(elementHandles, "innerHTML");191            return header;192        }193194        public static async Task<string[]> GetCurrencyData(Page page)195        {196            if(SEARCH_ALL_PAGES)197            {198                //get page number199                var elementHandles_number_of_pages = await page.XPathAsync($"//span[@class=\"nav_pagenum\"]");200                var pagenum_string_array = await ElementHandlesToArrayOfStrings(elementHandles_number_of_pages, "innerHTML");201                int number_of_pages = 1;202                if (pagenum_string_array.Length != 0)203                {204                    number_of_pages = Int32.Parse(pagenum_string_array[0]);205                }206                else207                {208                    throw new Exception("Could not find number of pages for current currency");209                }210211                //get data from every page212                List<string> records = new List<string>();213                for (int curr_page = 1; curr_page <= number_of_pages; ++curr_page)214                {215                    //take data from current page216                    Console.WriteLine("Loading data from page: " + curr_page + "...");217                    var elementHandles_records = await page.XPathAsync($"//td[@class=\"hui12_20\"]");218                    records.AddRange(await ElementHandlesToArrayOfStrings(elementHandles_records, "innerHTML"));219                    Console.WriteLine("Data from page: " + curr_page + " loaded");220221                    if (curr_page == number_of_pages) break;222                    //else go to next page223                    bool new_page_loaded_successfully = false;224                    while (!new_page_loaded_successfully)225                    {226                        //go to next page227                        await page.WaitForSelectorAsync("span[class='wcm_pointer nav_go_next']");228                        await page.ClickAsync("span[class='wcm_pointer nav_go_next']");229230                        //check if next page loaded successfully231                        await page.WaitForSelectorAsync(".hui12_20");232                        var elementHandles_search_error_msg = await page.XPathAsync($"//td[@class=\"hui12_20\"][text()=\"soryy,wrong search word submit,please check your search word!\"]");233                        var search_error_msg = await ElementHandlesToArrayOfStrings(elementHandles_search_error_msg, "innerHTML");234                        if (search_error_msg.Length != 0)235                        {236                            Console.WriteLine("Website isn't behaving as expected, this may take a while...");237                            //if not, recover to current page238                            bool loaded = false;239                            while (!loaded)240                            {241                                //recovery process:242                                await page.WaitForSelectorAsync(".hui12_20");243                                var elementHandles = await page.XPathAsync($"//td[@class=\"hui12_20\"][text()=\"soryy,wrong search word submit,please check your search word!\"]");244                                var search_failed_msg = await ElementHandlesToArrayOfStrings(elementHandles, "innerHTML");245                                if (search_failed_msg.Length != 0)246                                {247                                    await page.WaitForSelectorAsync("input[type='button'][value='search']");248                                    await page.ClickAsync("input[type='button'][value='search']");249                                }250                                else251                                {252                                    await page.WaitForSelectorAsync(".nav_page");253                                    var elementHandles_nav_pages_links = await page.XPathAsync($"//span[@class=\"nav_page\"]/a");254                                    var nav_pages_links = await ElementHandlesToArrayOfStrings(elementHandles_nav_pages_links, "innerHTML");255256                                    bool recovery_start_page_success = true;257                                    int recovery_start_page_number = 1;258                                    foreach(var link in nav_pages_links)259                                    {260                                        int link_pagenum = Int32.Parse(link);261                                        if (link_pagenum <= curr_page && link_pagenum > recovery_start_page_number)262                                        {263                                            recovery_start_page_number = link_pagenum;264                                        }265                                    }266                                    if(recovery_start_page_number != 1)267                                    {268                                        await page.WaitForSelectorAsync("span[class='nav_page']");269                                        await page.ClickAsync("span[class='nav_page'] a[onclick~='(" + recovery_start_page_number + "," + number_of_pages + ")']");270271                                        await page.WaitForSelectorAsync(".hui12_20");272                                        var elementHandles_search_error_msg3 = await page.XPathAsync($"//td[@class=\"hui12_20\"][text()=\"soryy,wrong search word submit,please check your search word!\"]");273                                        var search_error_msg3 = await ElementHandlesToArrayOfStrings(elementHandles_search_error_msg3, "innerHTML");274                                        if (search_error_msg3.Length != 0)275                                        {276                                            recovery_start_page_success = false;277                                        }278                                    }279                                    if(recovery_start_page_success)280                                    {281                                        int i;282                                        for (i = recovery_start_page_number; i < curr_page; ++i)283                                        {284                                            await page.WaitForSelectorAsync("span[class='wcm_pointer nav_go_next']");285                                            await page.ClickAsync("span[class='wcm_pointer nav_go_next']");286287                                            await page.WaitForSelectorAsync(".hui12_20");288                                            var elementHandles_search_error_msg2 = await page.XPathAsync($"//td[@class=\"hui12_20\"][text()=\"soryy,wrong search word submit,please check your search word!\"]");289                                            var search_error_msg2 = await ElementHandlesToArrayOfStrings(elementHandles_search_error_msg2, "innerHTML");290                                            if (search_error_msg2.Length != 0)291                                            {292                                                break;293                                            }294                                        }295                                        if (i == curr_page)296                                        {297                                            loaded = true;298                                        }299                                    }300                                }301                            }302                        }303                        else304                        {305                            //if it is loaded successfully, just continue306                            new_page_loaded_successfully = true;307                        }308                    }309                   310                }311312                return records.ToArray();313            }314            else315            {316                //get element from only first page317                var elementHandles_records = await page.XPathAsync($"//td[@class=\"hui12_20\"]");318                var records = await ElementHandlesToArrayOfStrings(elementHandles_records, "innerHTML");319                return records;320            }321            322        }323324        public static async Task WriteDataToOutputFile(string filepath, string[] header, string[] records)325        {326            using (System.IO.StreamWriter file = new System.IO.StreamWriter(@filepath, false))327            {328                int number_of_columns = 7;329                //write header330                string line = "";331                for (int i = 0; i < number_of_columns; ++i)
...

InvocationExtensions.cs

Source:InvocationExtensions.cs

...96            var page = pageObject.Page;97            if (page == null) return null;98            if (invocation.IsReturning<ElementHandle[]>())99            {100                return await page.XPathAsync(attribute.Expression).ConfigureAwait(false);101            }102            if (invocation.IsReturningElementObjectArray())103            {104                var arrayType = invocation.Method.ReturnType.GetGenericArguments()[0];105                var proxyType = arrayType.GetElementType();106                var elementHandles = await page.XPathAsync(attribute.Expression).ConfigureAwait(false);107                return ProxyFactory.ElementObjectArray(proxyType, page, elementHandles);108            }109            return null;110        }111        public static async Task<object> GetReturnValueAsync(this IInvocation invocation, ElementObject elementObject, XPathAttribute attribute)112        {113            var element = elementObject.Element;114            if (element == null) return null;115            if (invocation.IsReturning<ElementHandle[]>())116            {117                return await element.XPathAsync(attribute.Expression).ConfigureAwait(false);118            }119            if (invocation.IsReturningElementObjectArray())120            {121                var arrayType = invocation.Method.ReturnType.GetGenericArguments()[0];122                var proxyType = arrayType.GetElementType();123                var elementHandles = await element.XPathAsync(attribute.Expression).ConfigureAwait(false);124                return ProxyFactory.ElementObjectArray(proxyType, elementObject.Page, elementHandles);125            }126            return null;127        }128    }129}...

ShiftSearchClient.cs

Source:ShiftSearchClient.cs

...85            }86        }87        protected async Task<ElementHandle?> GetElement(Page page, string xPathMatch)88        {89            ElementHandle[] elementHandles = await page.XPathAsync(xPathMatch);90            List<ElementHandle> visibleHandles = new List<ElementHandle>();91            foreach (ElementHandle handle in elementHandles)92            {93                if (await handle.IsIntersectingViewportAsync())94                {95                    visibleHandles.Add(handle);96                }97            }98            if (visibleHandles.Count == 0)99            {100                return null;101            }102            if (visibleHandles.Count > 1)103            {...

RagingBullClient.cs

Source:RagingBullClient.cs

...94            return await GetElement(page, xPathMatch);95        }96        protected async Task<ElementHandle?> GetElement(Page page, string xPathMatch)97        {98            ElementHandle[] elementHandles = await page.XPathAsync(xPathMatch);99            List<ElementHandle> visibleHandles = new List<ElementHandle>();100            foreach (ElementHandle handle in elementHandles)101            {102                if (await handle.IsIntersectingViewportAsync())103                {104                    visibleHandles.Add(handle);105                }106            }107            if (visibleHandles.Count == 0)108            {109                return null;110            }111            if (visibleHandles.Count > 1)112            {...

ElementHandleExtensions.cs

Source:ElementHandleExtensions.cs

...45        /// <typeparam name="T">The type of <see cref="ElementObject" /></typeparam>46        /// <param name="elementHandle">A <see cref="ElementHandle" /></param>47        /// <param name="expression">Expression to evaluate <see href="https://developer.mozilla.org/en-US/docs/Web/API/Document/evaluate" /></param>48        /// <returns>Task which resolves to the <see cref="ElementObject" /> array</returns>49        /// <seealso cref="ElementHandle.XPathAsync(string)"/>50        public static async Task<T[]> XPathAsync<T>(this ElementHandle elementHandle, string expression) where T : ElementObject51        {52            var results = await elementHandle.GuardFromNull().XPathAsync(expression).ConfigureAwait(false);53            return results.Select(x => ProxyFactory.ElementObject<T>(x.GetPage(), x)).ToArray();54        }55        private static Page GetPage(this ElementHandle elementHandle)56        {57            var propertyInfo = elementHandle.GetType().GetProperty("Page", BindingFlags.NonPublic | BindingFlags.Instance);58            var methodInfo = propertyInfo?.GetGetMethod(nonPublic: true);59            return methodInfo?.Invoke(elementHandle, null) as Page;60        }61        private static ElementHandle GuardFromNull(this ElementHandle elementHandle)62        {63            if (elementHandle == null) throw new ArgumentNullException(nameof(elementHandle));64            return elementHandle;65        }66    }...

ElementHandleExtensionsTests.cs

Source:ElementHandleExtensionsTests.cs

...32            result = await _elementHandle.QuerySelectorAsync<FakeElementObject>(".missing");33            Assert.Null(result);34        }35        [Fact]36        public async Task XPathAsync_returns_proxies_of_type()37        {38            var result = await _elementHandle.XPathAsync<FakeElementObject>("//div");39            Assert.NotEmpty(result);40            Assert.All(result, x => Assert.IsAssignableFrom<FakeElementObject>(x));41            Assert.All(result, x => Assert.NotNull(x.Page));42            result = await _elementHandle.XPathAsync<FakeElementObject>("//missing");43            Assert.Empty(result);44        }45    }46}...

ElementHandleXPathTests.cs

Source:ElementHandleXPathTests.cs

...17        {18            await Page.GoToAsync(TestConstants.ServerUrl + "/playground.html");19            await Page.SetContentAsync("<html><body><div class=\"second\"><div class=\"inner\">A</div></div></body></html>");20            var html = await Page.QuerySelectorAsync("html");21            var second = await html.XPathAsync("./body/div[contains(@class, 'second')]");22            var inner = await second[0].XPathAsync("./div[contains(@class, 'inner')]");23            var content = await Page.EvaluateFunctionAsync<string>("e => e.textContent", inner[0]);24            Assert.Equal("A", content);25        }26        [PuppeteerTest("queryselector.spec.ts", "ElementHandle.$x", "should return null for non-existing element")]27        [PuppeteerFact]28        public async Task ShouldReturnNullForNonExistingElement()29        {30            await Page.SetContentAsync("<html><body><div class=\"second\"><div class=\"inner\">B</div></div></body></html>");31            var html = await Page.QuerySelectorAsync("html");32            var second = await html.XPathAsync("/div[contains(@class, 'third')]");33            Assert.Empty(second);34        }35    }36}...

HandleExtensions.cs

Source:HandleExtensions.cs

...4namespace Wasari.Puppeteer5{6    public static class HandleExtensions7    {8        public static async Task<ElementHandle> SingleOrDefaultXPathAsync(this Page page,9            string xpath)10        {11            var handles = await page.XPathAsync(xpath);12            return handles.SingleOrDefault();13        }14        15        public static async Task<ElementHandle> SingleOrDefaultXPathAsync(this ElementHandle elementHandle,16            string xpath)17        {18            var handles = await elementHandle.XPathAsync(xpath);19            return handles.SingleOrDefault();20        }21        public static async Task<T> GetPropertyValue<T>(this JSHandle elementHandle, string property)22        {23            await using var propertyAsync = await elementHandle.GetPropertyAsync(property);24            if (propertyAsync != null)25                return await propertyAsync.JsonValueAsync<T>();26            return default;27        }28    }29}...

XPathAsync

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.Linq;4using System.Text;5using System.Threading.Tasks;6using PuppeteerSharp;7{8    {9        static void Main(string[] args)10        {11            MainAsync(args).GetAwaiter().GetResult();12        }13        static async Task MainAsync(string[] args)14        {15            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);16            using (var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false }))17            using (var page = await browser.NewPageAsync())18            {19                await element.TypeAsync("PuppeteerSharp");20            }21        }22    }23}24public Task<ElementHandle> XPathAsync(string expression, object[] args = null);

XPathAsync

Using AI Code Generation

1var page = await browser.NewPageAsync();2var searchBox = await page.QuerySelectorAsync("input[title='Search']");3await searchBox.TypeAsync("PuppeteerSharp");4await searchBox.PressAsync("Enter");5await page.WaitForNavigationAsync();6foreach (var result in results)7{8    var text = await result.EvaluateFunctionAsync<string>("node => node.textContent");9    Console.WriteLine(text);10}11await browser.CloseAsync();12var page = await browser.NewPageAsync();13var searchBox = await page.QuerySelectorAsync("input[title='Search']");14await searchBox.TypeAsync("PuppeteerSharp");15await searchBox.PressAsync("Enter");16await page.WaitForNavigationAsync();17foreach (var result in results)18{19    var text = await result.EvaluateFunctionAsync<string>("node => node.textContent");20    Console.WriteLine(text);21}22await browser.CloseAsync();

XPathAsync

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.Linq;4using System.Text;5using System.Threading.Tasks;6using PuppeteerSharp;7using System.Diagnostics;8{9    {10        public static async Task<ElementHandle> XPathAsync(this ElementHandle elementHandle, string selector)11        {12            var document = await elementHandle.GetOwnerFrameAsync();13            return await document.XPathAsync(selector);14        }15    }16}17using System;18using System.Collections.Generic;19using System.Linq;20using System.Text;21using System.Threading.Tasks;22using PuppeteerSharp;23using System.Diagnostics;24{25    {26        public static async Task<ElementHandle> XPathAsync(this Frame frame, string selector)27        {28            var document = await frame.GetDocumentAsync();29            return await document.XPathAsync(selector);30        }31    }32}33using System;34using System.Collections.Generic;35using System.Linq;36using System.Text;37using System.Threading.Tasks;38using PuppeteerSharp;39using System.Diagnostics;40{41    {42        public static async Task<ElementHandle> XPathAsync(this Page page, string selector)43        {44            var document = await page.GetDocumentAsync();45            return await document.XPathAsync(selector);46        }47    }48}49using System;50using System.Collections.Generic;51using System.Linq;52using System.Text;53using System.Threading.Tasks;54using PuppeteerSharp;55using System.Diagnostics;56{57    {58        public static async Task<ElementHandle> XPathAsync(this Browser browser, string selector)59        {60            var document = await browser.GetDocumentAsync();61            return await document.XPathAsync(selector);62        }63    }64}65using System;66using System.Collections.Generic;67using System.Linq;68using System.Text;69using System.Threading.Tasks;70using PuppeteerSharp;71using System.Diagnostics;72{73    {74        public static async Task<ElementHandle> XPathAsync(this ElementHandle

XPathAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            using (var browser = await Puppeteer.LaunchAsync(new LaunchOptions9            {10            }))11            {12                using (var page = await browser.NewPageAsync())13                {14                    var xpath = new XPathSelector(page);15                    await title.TypeAsync("PuppeteerSharp");16                }17            }18        }19    }20}

XPathAsync

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 value = await elementHandle.EvaluateFunctionAsync<string>("(element) => element.getAttribute('value')");14            Console.WriteLine(value);15            await browser.CloseAsync();16        }17    }18}19using System;20using System.Threading.Tasks;21using PuppeteerSharp;22{23    {24        static async Task Main(string[] args)25        {26            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);27            var browser = await Puppeteer.LaunchAsync(new LaunchOptions28            {29            });30            var page = await browser.NewPageAsync();31            await page.TypeAsync("#search", "Hello World");32            var value = await elementHandle.EvaluateFunctionAsync<string>("(element) => element.getAttribute('value')");33            Console.WriteLine(value);34            await browser.CloseAsync();35        }36    }37}

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