WebBrowserNavigatingEventArgs Class (System.Windows.Forms)

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Microsoft Visual Studio 2008/.NET Framework 3.5

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.NET Framework Class Library

WebBrowserNavigatingEventArgs Class

Provides data for the WebBrowser..::.Navigating event.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

Syntax

Visual Basic (Declaration)

Public Class WebBrowserNavigatingEventArgs _
    Inherits CancelEventArgs

Visual Basic (Usage)

Dim instance As WebBrowserNavigatingEventArgs

public class WebBrowserNavigatingEventArgs : CancelEventArgs

Visual C++

public ref class WebBrowserNavigatingEventArgs : public CancelEventArgs

JScript

public class WebBrowserNavigatingEventArgs extends CancelEventArgs

Remarks

The WebBrowser..::.Navigating event occurs before the WebBrowser control navigates to a new document. You can handle this event to cancel navigation before it begins if certain conditions have not been met, for example, when the user has not completely filled out a form. To do this, set the Cancel property of the WebBrowserNavigatingEventArgs object passed to the event handler to true. You can also use this object to retrieve the location of the new document through the Url property. If the new document will be displayed in a Web page frame, you can retrieve the name of the frame through the TargetFrameName property.

Examples

The following code example demonstrates how to use a handler for the WebBrowser..::.Navigating event to cancel navigation when a Web page form has not been filled in. The WebBrowser..::.Document property is used to determine whether the form input field contains a value. This example requires that your form contains a WebBrowser control called webBrowser1.

Visual Basic

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

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());
    }
}

Inheritance Hierarchy

System..::.Object
  System..::.EventArgs
    System.ComponentModel..::.CancelEventArgs
      System.Windows.Forms..::.WebBrowserNavigatingEventArgs

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5, 2.0

Reference

WebBrowserNavigatingEventArgs Members

System.Windows.Forms Namespace

CancelEventArgs..::.Cancel

TargetFrameName

Url

WebBrowser

WebBrowser..::.Navigating