从浏览器控件vb.net获取textarea命名输入中的文本

Question

如何在浏览器控件的窗体中的文本区域中获取文本？有没有办法？

Answer 1

（注：我假设你的意思WebBrowser控件）。

你需要步行文档的DOM的控制。您必须开始加载控件，然后在加载后查询DOM。这里是一个例子：

Public Class Form1 

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
     AddHandler WebBrowser1.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf DocumentCompletedHandler) 
     WebBrowser1.Navigate("http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_textarea") 

    End Sub 

    Private Sub DocumentCompletedHandler(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs) 
     ' Walk the DOM of the document (any time needed after the document has been loaded) 
     Dim element As HtmlElement 

     For Each element In WebBrowser1.Document.GetElementsByTagName("textarea") 
      ' Limit our text area to the one with class="code_input". 
      ' You can change this to any other attribute that makes sense: 
      If element.GetAttribute("className") = "code_input" Then 
       Console.WriteLine(element.InnerText) 
      End If 
     Next 
    End Sub 
End Class