HtmlElementEventArgs Class

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Provides data for the events defined on HtmlDocument and HtmlElement.

public ref class HtmlElementEventArgs sealed : EventArgs

public sealed class HtmlElementEventArgs : EventArgs

type HtmlElementEventArgs = class
    inherit EventArgs

Public NotInheritable Class HtmlElementEventArgs
Inherits EventArgs

Inheritance

Object

EventArgs

HtmlElementEventArgs

Examples

The following code example demonstrates the use of this type. In the example, an event handler reports on the occurrence of the Click event. This report helps you to learn when the event occurs and can assist you in debugging. To report on multiple events or on events that occur frequently, consider replacing Show with Console.WriteLine or appending the message to a multiline TextBox.

To run the example code, paste it into a project that contains an instance of type HtmlDocument named HtmlDocument1. Then ensure that the event handler is associated with the Click event.

private void HtmlDocument1_Click(Object sender, HtmlElementEventArgs e) {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "MouseButtonsPressed", e.MouseButtonsPressed );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "ClientMousePosition", e.ClientMousePosition );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "OffsetMousePosition", e.OffsetMousePosition );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "MousePosition", e.MousePosition );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "BubbleEvent", e.BubbleEvent );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "KeyPressedCode", e.KeyPressedCode );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "AltKeyPressed", e.AltKeyPressed );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "CtrlKeyPressed", e.CtrlKeyPressed );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "ShiftKeyPressed", e.ShiftKeyPressed );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "EventType", e.EventType );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "ReturnValue", e.ReturnValue );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "FromElement", e.FromElement );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "ToElement", e.ToElement );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "Click Event" );
}

Private Sub HtmlDocument1_Click(sender as Object, e as HtmlElementEventArgs) _ 
     Handles HtmlDocument1.Click

    Dim messageBoxVB as New System.Text.StringBuilder()
    messageBoxVB.AppendFormat("{0} = {1}", "MouseButtonsPressed", e.MouseButtonsPressed)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "ClientMousePosition", e.ClientMousePosition)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "OffsetMousePosition", e.OffsetMousePosition)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "MousePosition", e.MousePosition)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "BubbleEvent", e.BubbleEvent)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "KeyPressedCode", e.KeyPressedCode)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "AltKeyPressed", e.AltKeyPressed)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "CtrlKeyPressed", e.CtrlKeyPressed)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "ShiftKeyPressed", e.ShiftKeyPressed)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "EventType", e.EventType)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "ReturnValue", e.ReturnValue)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "FromElement", e.FromElement)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "ToElement", e.ToElement)
    messageBoxVB.AppendLine()
    MessageBox.Show(messageBoxVB.ToString(),"Click Event")

End Sub

Remarks

HtmlElementEventArgs encapsulates the same information found on the window.event object when programming against the unmanaged HTML DOM or when writing Active Script for HTML pages.

In most cases, you can use ToElement to find the HTML element that's receiving the event action, and FromElement to find the HTML element that's being left. However, not every event supplies a value for these properties.

Many events in the HTML DOM are sent to their parent elements unless they are cancelled. This is known as event bubbling. If a SPAN inside of a DIV receives a click, then a click event is raised for the SPAN first, then for the DIV, and finally for the HTML page's BODY element. BubbleEvent controls whether an event behaves in this manner or not.

Properties

AltKeyPressed	Indicates whether the ALT key was pressed when this event occurred.
BubbleEvent	Gets or sets a value indicating whether the current event bubbles up through the element hierarchy of the HTML Document Object Model.
ClientMousePosition	Gets or sets the position of the mouse cursor in the document's client area.
CtrlKeyPressed	Indicates whether the CTRL key was pressed when this event occurred.
EventType	Gets the name of the event that was raised.
FromElement	Gets the HtmlElement the mouse pointer is moving away from.
KeyPressedCode	Gets the ASCII value of the keyboard character typed in a KeyPress, KeyDown, or KeyUp event.
MouseButtonsPressed	Gets the mouse button that was clicked during a MouseDown or MouseUp event.
MousePosition	Gets or sets the position of the mouse cursor relative to a relatively positioned parent element.
OffsetMousePosition	Gets or sets the position of the mouse cursor relative to the element that raises the event.
ReturnValue	Gets or sets the return value of the handled event.
ShiftKeyPressed	Indicates whether the SHIFT key was pressed when this event occurred.
ToElement	Gets the HtmlElement toward which the user is moving the mouse pointer.

Methods

Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

See also

• event Object