SP.WorkflowServices.WorkflowServicesManager.isConnected property (sp.workflowservices)
Gets a Boolean value that indicates whether the current instance is actively connected to a workflow host.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.WorkflowServices.WorkflowServicesManager.get_isConnected()
Return value
Returns true if the instance is connected. Otherwise returns false.