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docfx_project/examples/Page.WaitForSelectorAsync.Searching.md
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| # How to wait for a selector | ||
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| _Contributors: [Bilal Durrani](https://bilaldurrani.io/)_ | ||
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| ## Problem | ||
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| You need to wait for a selector to exist before operating on it. | ||
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| ## Solution | ||
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| Use `Page.WaitForSelectorAsync()` to delay execution until the selector is available. | ||
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| ```cs | ||
| using (var browser = await Puppeteer.LaunchAsync(options)) | ||
| using (var page = await browser.NewPageAsync()) | ||
| { | ||
| await page.GoToAsync("https://developers.google.com/web/"); | ||
| // Type into search box. | ||
| await page.TypeAsync("#searchbox input", "Headless Chrome"); | ||
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| // Wait for suggest overlay to appear and click "show all results". | ||
| var allResultsSelector = ".devsite-suggest-all-results"; | ||
| await page.WaitForSelectorAsync(allResultsSelector); | ||
| await page.ClickAsync(allResultsSelector); | ||
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| // continue the operation | ||
| } | ||
| ``` |
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| @@ -1,31 +1,37 @@ | ||
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| Microsoft Visual Studio Solution File, Format Version 12.00 | ||
| # Visual Studio 15 | ||
| VisualStudioVersion = 15.0.28010.2046 | ||
| MinimumVisualStudioVersion = 10.0.40219.1 | ||
| Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "get-all-links", "get-all-links\get-all-links.csproj", "{8A25F29D-EC44-4AA9-86D6-C86A476B85CC}" | ||
| EndProject | ||
| Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "complex-js-objects", "complex-js-objects\complex-js-objects.csproj", "{47A6DEE8-5581-472A-91E2-9FC8A2924D70}" | ||
| EndProject | ||
| Global | ||
| GlobalSection(SolutionConfigurationPlatforms) = preSolution | ||
| Debug|Any CPU = Debug|Any CPU | ||
| Release|Any CPU = Release|Any CPU | ||
| EndGlobalSection | ||
| GlobalSection(ProjectConfigurationPlatforms) = postSolution | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Debug|Any CPU.Build.0 = Debug|Any CPU | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Release|Any CPU.ActiveCfg = Release|Any CPU | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Release|Any CPU.Build.0 = Release|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Debug|Any CPU.ActiveCfg = Debug|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Debug|Any CPU.Build.0 = Debug|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Release|Any CPU.ActiveCfg = Release|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Release|Any CPU.Build.0 = Release|Any CPU | ||
| EndGlobalSection | ||
| GlobalSection(SolutionProperties) = preSolution | ||
| HideSolutionNode = FALSE | ||
| EndGlobalSection | ||
| GlobalSection(ExtensibilityGlobals) = postSolution | ||
| SolutionGuid = {9813FF07-4856-4880-BB3A-E34F69F783BA} | ||
| EndGlobalSection | ||
| EndGlobal | ||
|
|
||
| Microsoft Visual Studio Solution File, Format Version 12.00 | ||
| # Visual Studio 15 | ||
| VisualStudioVersion = 15.0.28010.2046 | ||
| MinimumVisualStudioVersion = 10.0.40219.1 | ||
| Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "get-all-links", "get-all-links\get-all-links.csproj", "{8A25F29D-EC44-4AA9-86D6-C86A476B85CC}" | ||
| EndProject | ||
| Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "complex-js-objects", "complex-js-objects\complex-js-objects.csproj", "{47A6DEE8-5581-472A-91E2-9FC8A2924D70}" | ||
| EndProject | ||
| Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "searching", "searching\searching.csproj", "{DEB4FB4A-3353-46AE-965D-F9D9D2092157}" | ||
| EndProject | ||
| Global | ||
| GlobalSection(SolutionConfigurationPlatforms) = preSolution | ||
| Debug|Any CPU = Debug|Any CPU | ||
| Release|Any CPU = Release|Any CPU | ||
| EndGlobalSection | ||
| GlobalSection(ProjectConfigurationPlatforms) = postSolution | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Debug|Any CPU.Build.0 = Debug|Any CPU | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Release|Any CPU.ActiveCfg = Release|Any CPU | ||
| {8A25F29D-EC44-4AA9-86D6-C86A476B85CC}.Release|Any CPU.Build.0 = Release|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Debug|Any CPU.ActiveCfg = Debug|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Debug|Any CPU.Build.0 = Debug|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Release|Any CPU.ActiveCfg = Release|Any CPU | ||
| {47A6DEE8-5581-472A-91E2-9FC8A2924D70}.Release|Any CPU.Build.0 = Release|Any CPU | ||
| {DEB4FB4A-3353-46AE-965D-F9D9D2092157}.Debug|Any CPU.ActiveCfg = Debug|Any CPU | ||
| {DEB4FB4A-3353-46AE-965D-F9D9D2092157}.Debug|Any CPU.Build.0 = Debug|Any CPU | ||
| {DEB4FB4A-3353-46AE-965D-F9D9D2092157}.Release|Any CPU.ActiveCfg = Release|Any CPU | ||
| {DEB4FB4A-3353-46AE-965D-F9D9D2092157}.Release|Any CPU.Build.0 = Release|Any CPU | ||
| EndGlobalSection | ||
| GlobalSection(SolutionProperties) = preSolution | ||
| HideSolutionNode = FALSE | ||
| EndGlobalSection | ||
| GlobalSection(ExtensibilityGlobals) = postSolution | ||
| SolutionGuid = {9813FF07-4856-4880-BB3A-E34F69F783BA} | ||
| EndGlobalSection | ||
| EndGlobal |
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| using System; | ||
| using System.Threading.Tasks; | ||
| using PuppeteerSharp; | ||
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| namespace Example.Searching | ||
| { | ||
| class Program | ||
| { | ||
| public static async Task Main(string[] args) | ||
| { | ||
| var options = new LaunchOptions { Headless = true }; | ||
| Console.WriteLine("Downloading chromium"); | ||
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| await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision); | ||
| Console.WriteLine("Navigating to developers.google.com"); | ||
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| using (var browser = await Puppeteer.LaunchAsync(options)) | ||
| using (var page = await browser.NewPageAsync()) | ||
| { | ||
| await page.GoToAsync("https://developers.google.com/web/"); | ||
| // Type into search box. | ||
| await page.TypeAsync("#searchbox input", "Headless Chrome"); | ||
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| // Wait for suggest overlay to appear and click "show all results". | ||
| var allResultsSelector = ".devsite-suggest-all-results"; | ||
| await page.WaitForSelectorAsync(allResultsSelector); | ||
| await page.ClickAsync(allResultsSelector); | ||
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| // Wait for the results page to load and display the results. | ||
| var resultsSelector = ".gsc-results .gsc-thumbnail-inside a.gs-title"; | ||
| await page.WaitForSelectorAsync(resultsSelector); | ||
| var links = await page.EvaluateFunctionAsync(@"(resultsSelector) => { | ||
| const anchors = Array.from(document.querySelectorAll(resultsSelector)); | ||
| return anchors.map(anchor => { | ||
| const title = anchor.textContent.split('|')[0].trim(); | ||
| return `${title} - ${anchor.href}`; | ||
| }); | ||
| }", resultsSelector); | ||
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| foreach (var link in links) | ||
| { | ||
| Console.WriteLine(link); | ||
| } | ||
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| Console.WriteLine("Press any key to continue..."); | ||
| Console.ReadLine(); | ||
| } | ||
| } | ||
| } | ||
| } |
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| # Scraping search results from a website | ||
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| This example searches developers.google.com/web for articles tagged | ||
| "Headless Chrome" and scrape results from the results page. |
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>netcoreapp2.1</TargetFramework> | ||
| <LangVersion>7.1</LangVersion> | ||
| </PropertyGroup> | ||
|
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| <ItemGroup> | ||
| <PackageReference Include="puppeteersharp" Version="1.9.0" /> | ||
| </ItemGroup> | ||
|
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| </Project> |