Working with workflow service in JavaScript (JSOM) in SharePoint 2013 / Office 365 (SharePoint Online) – Part 1 (iterate workflow deployments and subscriptions)

SharePoint 2013 provides set of JavaScript libraries that can used to manage workflows. First you need to refer sp.workflowservices.js which is available in _layouts/15/sp.workflowservices.js.

<script src="/_layouts/15/sp.workflowservices.js"></script>

Following are few examples of using the library

1. Get all Workflows deployed to current web
2. Get all workflow subscriptions attached to a list
3. Get all workflow subscriptions in current web
4. Get all workflow subscriptions for workflow definition

apart from these things you can get subscriptions by

• enumerateSubscriptionsByEventSource
  
• enumerateSubscriptionsByListAndParentContentType
  
• enumerateSubscriptionsByListWithContentType

Get all Workflows deployed to current web

var context = SP.ClientContext.get_current();
var web = context.get_web();
var sMgr =new SP.WorkflowServices.WorkflowServicesManager(context, web);
var wDefs = sMgr.getWorkflowDeploymentService().enumerateDefinitions();
context.load(wDefs);

context.executeQueryAsync(
    function(){
        var e = wDefs.getEnumerator();
        while (e.moveNext()) {
            var def = e.get_current();
            alert(def.get_displayName() + " id: " + def.get_id());
        }
    },
    function(a,b){
        alert(args.get_message());
    }
);

Get all workflow subscriptions attached to a list 

For this you need to have List Guide related to relevant list.

var listGuid = "93A65752-DB60-496F-B9F5-CD864050DB39";     

var context = SP.ClientContext.get_current();

var web = context.get_web();

var sMgr =new SP.WorkflowServices.WorkflowServicesManager(context, web);

var sservice = sMgr.getWorkflowSubscriptionService();

var ssubs = sservice.enumerateSubscriptionsByList(listGuid);

context.load(ssubs);

context.executeQueryAsync(

   function(){

       var e = ssubs.getEnumerator();

         while(e.moveNext())

         {

           var c =  e.get_current();

           alert("Name :" + c.get_name() + " sID: " + c.get_id());

         };

   },

   function(){ alert("error")}

);

Get all workflow subscriptions in current web

var context = SP.ClientContext.get_current();
var web = context.get_web();
var sMgr =new SP.WorkflowServices.WorkflowServicesManager(context, web);
var sservice = sMgr.getWorkflowSubscriptionService();
var ssubs = sservice.enumerateSubscriptions();
context.load(ssubs);
context.executeQueryAsync(
    function(){
        var e = ssubs.getEnumerator();
          while(e.moveNext())
          {
            var c =  e.get_current();
            alert("Name :" + c.get_name() + " sID: " + c.get_id());
          };
 
    },
    function(){ alert("error")}
);

Get all workflow subscriptions for workflow definition

var wfdefinitionId = "c791c3cb-abcd-4022-bc06-6fcc6ca4f6bc"; 
var context = SP.ClientContext.get_current();
var web = context.get_web();
var sMgr =new SP.WorkflowServices.WorkflowServicesManager(context, web);
var sservice = sMgr.getWorkflowSubscriptionService();
var ssubs = sservice.enumerateSubscriptionsByDefinition(wfdefinitionId);
context.load(ssubs);
context.executeQueryAsync(
    function(){
        var e = ssubs.getEnumerator();
          while(e.moveNext())
          {
            var c =  e.get_current();
            alert("Name :" + c.get_name() + " sID: " + c.get_id());
          };
 
    },
    function(){ alert("error")}
);