vbnet/console/InjectObjectForScripting/Program.vb

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Imports System
Imports System.Text
Imports DotNetBrowser.Browser
Imports DotNetBrowser.Browser.Handlers
Imports DotNetBrowser.Engine
Imports DotNetBrowser.Geometry
Imports DotNetBrowser.Handlers
Imports DotNetBrowser.Js

Namespace InjectObjectForScripting
	''' <summary>
	'''     This example demonstrates how to use InjectJsHandler for injecting "window.external"
	'''     object into the web page.
	''' </summary>
	Friend Class Program

		Private Shared Sub InjectObjectForScripting(ByVal p As InjectJsParameters)
			Dim window As IJsObject = p.Frame.ExecuteJavaScript(Of IJsObject)("window").Result
			window.Properties("external") = ObjectForScripting.Instance
		End Sub

		Public Shared Sub Main(ByVal args() As String)
			Try
				Using engine As IEngine = EngineFactory.Create((New EngineOptions.Builder()).Build())
					Using browser As IBrowser = engine.CreateBrowser()

						browser.Size = New Size(700, 500)
						browser.InjectJsHandler = New Handler(Of InjectJsParameters)(AddressOf InjectObjectForScripting)
					    Dim htmlBytes() As Byte = Encoding.UTF8.GetBytes("<html>
                                     <body>
                                        <script type='text/javascript'>
                                            var SetTitle = function () 
                                            {
                                                 document.title = window.external.GetTitle();
                                            };
                                        </script>
                                     </body>
                                   </html>")
					    browser.Navigation.LoadUrl("data:text/html;base64," + Convert.ToBase64String(htmlBytes)).Wait()

						browser.MainFrame.ExecuteJavaScript(Of IJsObject)("window.SetTitle();").Wait()

						Console.WriteLine($"{vbTab}Browser title: {browser.Title}")
					End Using
				End Using
			Catch e As Exception
				Console.WriteLine(e)
			End Try

			Console.WriteLine("Press any key to terminate...")
			Console.ReadKey()
		End Sub

		Public NotInheritable Class ObjectForScripting

			Public Shared ReadOnly Property Instance() As New ObjectForScripting()

			Shared Sub New()
			End Sub

			Private Sub New()
			End Sub

			Public Function GetTitle() As String
				Return "Document title from .NET"
			End Function

		End Class
	End Class
End Namespace