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

var value; // Type: Vintasoft.Twain.WebTwainPageOrientationEnumJS[]
value = instance.getSupportedPageOrientations();

function getSupportedPageOrientations() : WebTwainPageOrientationEnumJS[];

Return Value

This function sends a synchronous request to get supported values of WebTwainDeviceCapabilityIdEnumJS.IOrientation capability. If you want to use asynchronous request instead of synchronous request, please get information about WebTwainDeviceCapabilityIdEnumJS.IOrientation capability using WebTwainDeviceJS.getCapabilityAsync function.

Reference

WebTwainDeviceJS Class
WebTwainDeviceJS Members