HtmlEventProperty class

One value inside an HtmlEventProperties event bag --- returned by HtmlEventProperties.Item. Carries the field's Value plus a Properties accessor for nested drill-down (e.g. eventInfo.target.id).

Almost always written in shorthand --- neither HtmlEventProperty nor its parent HtmlEventProperties is typically named in addin code; the compiler resolves chains like eventInfo.target.id through their default-members. Unlike HtmlElementProperty, Value is read-only --- event payloads are an inbound signal from the DOM, not an outbound property setter.

Private Sub MyButtonKeyUp(ByVal eventInfo As HtmlEventProperties)
    If eventInfo.key = "Enter" Then
        Dim entered As String = eventInfo.target.value
        ' …
    End If
End Sub

Properties

Properties

A nested HtmlEventProperties for fields that themselves have sub-fields (the canonical example is .target, whose sub-fields are the target element's own properties --- id, value, name, tagName, …). Read-only at the accessor level.

Syntax: property.Properties As HtmlEventProperties

Value

The field's value, as a Variant. DefaultMember --- so eventInfo.key desugars to eventInfo.Item("key").Value. Read-only --- event payloads cannot be modified.

Syntax: property As Variant

The interface is [COMExtensible(True)] --- see Dynamic DOM property resolution on the package overview. Field names that route through Properties are resolved against the live event object at run time, not declared statically.