Optimus headless browser with C#

Question

Can somebody tell me how to use Optimus (headless browser) nuget package with C# to get response from a URL. I also want javascript on the page to be executed automatically like phantomjs.

Answer 1

Quite a simple bit of kit:

1. Create an Engine component first (common for dynamic and static pages):

   Engine engine = new Engine();

2. Open the url of the html document you want to retreive:

   a) Not waiting for any elements added in with javascript:

   engine.OpenUrl("http://google.com").Wait();

   b) Waiting for any elements added in with javascript:

   engine.OpenUrl("http://google.com")

   and then either:

   • engine.WaitDesappearingOfId("some-id")
   • engine.WaitId("some-id")
   • engine.WaitDocumentLoad()
   • engine.WaitSelector("#some-id")
   • engine.WaitSelector(".some-class")

now you open the url, there are two ways of doing this - load the document (prior to any javascript being executed):

More complete examples:

public static string dynamicLoadingPage()
{
    var engine = new Engine();
    engine.OpenUrl("https://html5test.com");
    var tagWithValue = engine.WaitSelector("#score strong").FirstOrDefault();
    System.Console.WriteLine("Score: " + tagWithValue.InnerHTML);
}

Otherwise:

static string staticLoadingPage()
{
   var engine = new Engine();
   engine.OpenUrl("http://google.com").Wait();
   Console.WriteLine("The first document child node is: " + engine.Document.FirstChild);
   Console.WriteLine("The first document body child node is: " + engine.Document.Body.FirstChild);
   Console.WriteLine("The first element tag name is: " + engine.Document.ChildNodes.OfType<HtmlElement>().First().TagName);
   Console.WriteLine("Whole document innerHTML length is: " + engine.Document.DocumentElement.InnerHTML.Length);

}