cantops / PuppeteerAot

Headless Chrome .NET API and support for AOT compilation

PuppeteerAot

PuppeteerAot is fork from PuppeteerSharp and support for AOT compilation.

Why do we create this library?

• I am developing The Net8.0 application attempted to reference PuppeterSharp Or Microsoft PlayWright, programs cannot be executed in AOT environment. The purpose of developing this library is very simple, which is to use Puppeter or PlayWright under Aot,

What modifications have been made?

1. Net Standard 2.0 to Net 8.0
2. WebClient to HttpClient
3. NewtonSoft.Json to System.Text.Json

Prerequisites

• As PuppeteerAot is a Net 8.0 library, the minimum platform versions are .Net 8.0. Read more.
• If you have issues running Chrome on Linux, the Puppeteer repo has a great troubleshooting guide.
• X-server is required on Linux.

How to Contribute and Provide Feedback

Some of the best ways to contribute are to try things out file bugs and fix issues.

If you have an issue or a question:

• File a new issue.

Usage

Take screenshots

using var browserFetcher = new BrowserFetcher();
await browserFetcher.DownloadAsync();
await using var browser = await Puppeteer.LaunchAsync(
    new LaunchOptions { Headless = true });
await using var page = await browser.NewPageAsync();
await page.GoToAsync("http://www.google.com");
await page.ScreenshotAsync(outputFile);

^anchor

You can also change the view port before generating the screenshot

await Page.SetViewportAsync(new ViewPortOptions
{
    Width = 500,
    Height = 500
});

^anchor

Generate PDF files

using var browserFetcher = new BrowserFetcher();
await browserFetcher.DownloadAsync();
await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });
await using var page = await browser.NewPageAsync();
await page.GoToAsync("http://www.google.com"); // In case of fonts being loaded from a CDN, use WaitUntilNavigation.Networkidle0 as a second param.
await page.EvaluateExpressionHandleAsync("document.fonts.ready"); // Wait for fonts to be loaded. Omitting this might result in no text rendered in pdf.
await page.PdfAsync(outputFile);

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Inject HTML

await using var page = await browser.NewPageAsync();
await page.SetContentAsync("<div>My Receipt</div>");
var result = await page.GetContentAsync();

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Evaluate Javascript

await using var page = await browser.NewPageAsync();
var seven = await page.EvaluateExpressionAsync<int>("4 + 3");
var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);
Console.WriteLine(someObject.a);

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Wait For Selector

using (var page = await browser.NewPageAsync())
{
    await page.GoToAsync("http://www.spapage.com");
    await page.WaitForSelectorAsync("div.main-content")
    await page.PdfAsync(outputFile));
}

Wait For Function

using (var page = await browser.NewPageAsync())
{
    await page.GoToAsync("http://www.spapage.com");
    var watchDog = page.WaitForFunctionAsync("()=> window.innerWidth < 100");
    await page.SetViewportAsync(new ViewPortOptions { Width = 50, Height = 50 });
    await watchDog;
}

Connect to a remote browser

var options = new ConnectOptions()
{
    BrowserWSEndpoint = $"wss://www.externalbrowser.io?token={apikey}"
};

var url = "https://www.google.com/";

using (var browser = await PuppeteerAot.Puppeteer.ConnectAsync(options))
{
    using (var page = await browser.NewPageAsync())
    {
        await page.GoToAsync(url);
        await page.PdfAsync("wot.pdf");
    }
}