Private Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles convertToPdfButton.Click ' Create a HTML to PDF converter object with default settings Dim htmlToPdfConverter As New HtmlToPdfConverter() ' Set license key received after purchase to use the converter in licensed mode ' Leave it not set to use the converter in demo mode htmlToPdfConverter.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=" ' Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed ' Set this property to 0 if you don't need to wait for such asynchcronous operations to finish htmlToPdfConverter.ConversionDelay = 2 Cursor = Cursors.WaitCursor ' Convert HTML to PDF using the settings above Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Button_JavaScript_Actions.pdf" Dim pdfDocument As Document = Nothing Try Dim htmlWithButton As String = htmlStringTextBox.Text Dim baseUrl As String = baseUrlTextBox.Text ' Convert a HTML string with a button to a PDF document object pdfDocument = htmlToPdfConverter.ConvertHtmlToPdfDocumentObject(htmlWithButton, baseUrl) ' Get the button location in PDF Dim buttonMapping As HtmlElementMapping = htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult.GetElementByMappingId("javascript_button") If buttonMapping IsNot Nothing Then Dim buttonPdfPage As PdfPage = buttonMapping.PdfRectangles(0).PdfPage Dim buttonRectangle As RectangleF = buttonMapping.PdfRectangles(0).Rectangle ' The font used for buttons text in PDF document Dim buttonTextFont As PdfFont = pdfDocument.AddFont(New Font("Times New Roman", 8, FontStyle.Regular, GraphicsUnit.Point)) ' Create a PDF form button Dim pdfButton As PdfFormButton = pdfDocument.Form.AddButton(buttonPdfPage, buttonRectangle, "Execute Acrobat JavaScript", buttonTextFont) ' Set JavaScript action to be executed when the button is clicked Dim javaScript As String = Nothing If alertMessageRadioButton.Checked Then ' JavaScript to display an alert mesage javaScript = String.Format("app.alert(""{0}"")", alertMessageTextBox.Text) ElseIf printDialogRadioButton.Checked Then ' JavaScript to open the print dialog javaScript = "print()" ElseIf zoomLevelRadioButton.Checked Then ' JavaScript to set an initial zoom level javaScript = String.Format("zoom={0}", Integer.Parse(zoomLevelTextBox.Text)) End If ' Set the JavaScript action pdfButton.Action = New PdfActionJavaScript(javaScript) End If ' Save the PDF document in a memory buffer Dim outPdfBuffer() As Byte = pdfDocument.Save() ' Write the memory buffer in a PDF file System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer) Catch ex As Exception ' The HTML to PDF conversion failed MessageBox.Show(String.Format("HTML to PDF Error. {0}", ex.Message)) Return Finally ' Close the PDF document If pdfDocument IsNot Nothing Then pdfDocument.Close() End If Cursor = Cursors.Arrow End Try ' Open the created PDF document in default PDF viewer Try Process.Start(outPdfFile) Catch ex As Exception MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message)) End Try End Sub