USBAlternateInterface

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

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()

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.

Instance properties

USBAlternateInterface.alternateSetting Read only

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

USBAlternateInterface.interfaceClass Read 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.interfaceSubclass Read 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.interfaceProtocol Read 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.interfaceName Read 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.endpoints Read only

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

Specifications

Specification
WebUSB API
# usbalternateinterface

Browser compatibility