var instance = new Vintasoft.Twain.WebTwainDeviceJS(deviceName, productFamily, manufacturer, driverVersion, twainVersion, deviceManager, is64Bit);

var value; // Type: any

// Parameters
var twainCapabilityId; // Type: number
var twainCapabilityValue; // Type: string
var successFunc; // Type: function
var errorFunc; // Type: function

value = instance.setCapabilityAsync(twainCapabilityId, twainCapabilityValue, successFunc, errorFunc);

function setCapabilityAsync(
   twainCapabilityId
An identifier of TWAIN device capability as a number.
 : number, 
   twainCapabilityValue
A string that represents value that should be set to the TWAIN device capability.
 : string, 
   successFunc
A function that will be executed if request is executed successfully. Function prototype: "successFunc(twainDevice, capInfo)", where 'twainDevice' parameter is an instance of WebTwainDeviceJS class, 'capInfo' parameter is object that contains information about TWAIN device capabilities.
 : Function, 
   errorFunc
A function that will be executed if request is failed. Function prototype: "errorFunc(twainDevice, errorMessage)", where 'twainDevice' parameter is an instance of WebTwainDeviceJS class, 'errorMessage' parameter is string that describes error.
 : Function
) : any;

Parameters

twainCapabilityId

An identifier of TWAIN device capability as a number.

twainCapabilityValue

A string that represents value that should be set to the TWAIN device capability.

successFunc

A function that will be executed if request is executed successfully. Function prototype: "successFunc(twainDevice, capInfo)", where 'twainDevice' parameter is an instance of WebTwainDeviceJS class, 'capInfo' parameter is object that contains information about TWAIN device capabilities.

errorFunc

A function that will be executed if request is failed. Function prototype: "errorFunc(twainDevice, errorMessage)", where 'twainDevice' parameter is an instance of WebTwainDeviceJS class, 'errorMessage' parameter is string that describes error.

This function sends an asynchronous request to set value of TWAIN device capability. If you want to use synchronous request instead of asynchronous request, please use WebTwainDeviceJS.setCapability function.

Reference

WebTwainDeviceJS Class
WebTwainDeviceJS Members