WebBrowser.Document Property

Definition

Gets an HtmlDocument representing the Web page currently displayed in the WebBrowser control.

public:
 property System::Windows::Forms::HtmlDocument ^ Document { System::Windows::Forms::HtmlDocument ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.HtmlDocument Document { get; }
member this.Document : System.Windows.Forms.HtmlDocument
Public ReadOnly Property Document As HtmlDocument

Property Value

An HtmlDocument representing the current page, or null if no page is loaded.

Attributes

Exceptions

This WebBrowser instance is no longer valid.

A reference to an implementation of the IWebBrowser2 interface could not be retrieved from the underlying ActiveX WebBrowser control.

Examples

The following code example demonstrates how to use the Document property in a handler for the Navigating event to determine whether a Web page form has been filled in. If the input field does not contain a value, the navigation is canceled.

This example requires that your form contains a WebBrowser control called webBrowser1.

private void Form1_Load(object sender, EventArgs e)
{
    webBrowser1.DocumentText =
        "<html><body>Please enter your name:<br/>" +
        "<input type='text' name='userName'/><br/>" +
        "<a href='http://www.microsoft.com'>continue</a>" +
        "</body></html>";
    webBrowser1.Navigating += 
        new WebBrowserNavigatingEventHandler(webBrowser1_Navigating);
}

private void webBrowser1_Navigating(object sender, 
    WebBrowserNavigatingEventArgs e)
{
    System.Windows.Forms.HtmlDocument document =
        this.webBrowser1.Document;

    if (document != null && document.All["userName"] != null && 
        String.IsNullOrEmpty(
        document.All["userName"].GetAttribute("value")))
    {
        e.Cancel = true;
        System.Windows.Forms.MessageBox.Show(
            "You must enter your name before you can navigate to " +
            e.Url.ToString());
    }
}
Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) _
    Handles Me.Load

    webBrowser1.DocumentText = _
        "<html><body>Please enter your name:<br/>" & _
        "<input type='text' name='userName'/><br/>" & _
        "<a href='http://www.microsoft.com'>continue</a>" & _
        "</body></html>"

End Sub

Private Sub webBrowser1_Navigating( _
    ByVal sender As Object, ByVal e As WebBrowserNavigatingEventArgs) _
    Handles webBrowser1.Navigating

    Dim document As System.Windows.Forms.HtmlDocument = _
        webBrowser1.Document
    If document IsNot Nothing And _
        document.All("userName") IsNot Nothing And _
        String.IsNullOrEmpty( _
        document.All("userName").GetAttribute("value")) Then

        e.Cancel = True
        MsgBox("You must enter your name before you can navigate to " & _
            e.Url.ToString())
    End If

End Sub

Remarks

Use this property when you want to access the contents of a Web page displayed in the WebBrowser control through the HTML document object model (DOM). This is useful, for example, when you want to use Web-based controls in your Windows Forms application.

You can use this property, in combination with the ObjectForScripting property, to implement two-way communication between a Web page displayed in the WebBrowser control and your application. Use the HtmlDocument.InvokeScript method to call script methods implemented in a Web page from your client application code. Your scripting code can access your application through the window.external object, which is a built-in DOM object provided for host access, and which maps to an object that you specify for the ObjectForScripting property.

To access the contents of a Web page as a string, use the DocumentText property. To access the contents of a Web page as a Stream, use the DocumentStream property.

Security

SecurityPermission
for immediate callers to use this control. Demand value: LinkDemand; Named Permission Sets: FullTrust.

Applies to

See also