What is a headless browser?Ī headless browser is simply a browser but without a graphical user interface. Fortunately, there are better solutions – headless browsers.

These UI elements are not needed when everything is being controlled with code. Unfortunately, loading a browser would take a lot of resources because it has to load a lot of other things like the toolbar and buttons. The easiest way to manage these sites is to open a browser and load the site. The biggest is that it cannot handle dynamic sites – sites that are rendered using JavaScript. Though this is a fast method, it has its limitations. We covered this process in-depth in our JavaScript web scraping tutorial. This can then be parsed using packages like Cheerio. It directly sends a get request to the web page and receives HTML content. The first method uses packages e.g., Axios. Generally, there are two methods of accessing and parsing web pages.

There are a few methods to accessing and parsing web pages, but in this tutorial we will be covering how to do it with Google Puppeteer. Web scraping and automation with JavaScript has evolved a lot in recent years. AllowDecimalPoint, deDE, out var decValueEstPercent ) ĭto. AllowDecimalPoint, deDE, out var decValueEst ) ĭecimal. Var deDE = new CultureInfo ( 'de-DE ' ) ĭecimal. EvaluateFunctionAsync ( '()=>document.querySelector('#ui-id-4 > div.ekst_ergebnis > div:nth-child(6) > table > tbody > tr:nth-child(3) > td:nth-child(3) > strong').textContent ' ) EvaluateFunctionAsync ( '()=>document.querySelector('#ui-id-4 > div.ekst_ergebnis > div:nth-child(6) > table > tbody > tr:nth-child(3) > td:nth-child(2) > strong').textContent ' ) WaitForExpressionAsync ( $' document.getElementById(' ').checked = true ' ) Īwait page. await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision) // This statement downloads and installs chromium String id_input_Umsatz = 'bmf_form_ekst:ekst_zve ' String id_checkbox_IsMarried = 'bmf_form_ekst:ekst_pv:0 ' downloads chromium to the local project, needed by Puppeteer Sharp for execution, takes about 2 min!Īwait new BrowserFetcher ( ).

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