USBAlternateInterface

The USBAlternateInterface interface of the WebUSB API provides information about a particular configuration of an interface provided by the USB device. An interface includes one or more alternate settings which can configure a set of endpoints based on the operating mode of the device.

Constructor

USBAlternateInterface.USBAlternateInterface

Creates a new USBAlternateInterface object which will be populated with information about the alternate interface of the provided USBInterface with the given alternate setting number.

Properties

USBAlternateInterface.alternateSettingRead only

Returns the alternate setting number of this interface. This is equal to the bAlternateSetting field of the interface descriptor defining this interface.

USBAlternateInterface.interfaceClassRead only

Returns the class of this interface. This is equal to the bInterfaceClass field of the interface descriptor defining this interface. Standardized values for this field are defined by the USB Implementers Forum. A value of 0xFF indicates a vendor-defined interface.

USBAlternateInterface.interfaceSubclassRead only

Returns the subclass of this interface. This is equal to the bInterfaceSubClass field of the interface descriptor defining this interface. The meaning of this value depends on the interfaceClass field.

USBAlternateInterface.interfaceProtocolRead only

Returns the protocol supported by this interface. This is equal to the bInterfaceProtocol field of the interface descriptor defining this interface. The meaning of this value depends on the interfaceClass and interfaceSubclass fields.

USBAlternateInterface.interfaceNameRead only

Returns the name of the interface, if one is provided by the device. This is the value of the string descriptor with the index specified by the iInterface field of the interface descriptor defining this interface.

USBAlternateInterface.endpointsRead only

Returns an array containing instances of the USBEndpoint interface describing each of the endpoints that are part of this interface.

Specifications

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
USBAlternateInterface	61	79	No	No	48	No	No	61	No	45	No	8.0
USBAlternateInterface	61	79	No	No	48	No	No	61	No	45	No	8.0
alternateSetting	61	79	No	No	48	No	No	61	No	45	No	8.0
endpoints	61	79	No	No	48	No	No	61	No	45	No	8.0
interfaceClass	61	79	No	No	48	No	No	61	No	45	No	8.0
interfaceName	61	79	No	No	48	No	No	61	No	45	No	8.0
interfaceProtocol	61	79	No	No	48	No	No	61	No	45	No	8.0
interfaceSubclass	61	79	No	No	48	No	No	61	No	45	No	8.0