JSOM : run work flow using Javascript

Question

I am trying to run a workflow using JSOM for office365 workflow

I have used this cod to call the function :

<a href="javascript:startWorkflow(\'{FF71E26B-04B8-42CF-B641-30819F122C25}\', '19')">Request for update</a></li>

and for the java script :

function startWorkflow(itemID, subID) {

                        var context = SP.ClientContext.get_current();
                        var web = context.get_web();

                        var wfServiceManager = SP.WorkflowServices.WorkflowServicesManager.newObject(context, web);

                        var subscription = wfServiceManager.getWorkflowSubscriptionService().getSubscription(subID);

                        context.load(subscription);

                        context.executeQueryAsync(
                            function (sender, args) {
                                console.log("Subscription load success. Attempting to start workflow.");
                                //notify_i('Request failed', 'Subscription load success. Attempting to start workflow.' + '\n' + args.get_stackTrace());
                                var inputParameters = {};

                                wfServiceManager.getWorkflowInstanceService().startWorkflowOnListItem(subscription, itemID, inputParameters);

                                context.executeQueryAsync(
                                    function (sender, args) { console.log("Successfully starting workflow."); },
                                    function (sender, args) {
                                        console.log("Failed to start workflow.");
                                        console.log("Error: " + args.get_message() + "\n" + args.get_stackTrace());
                                    }
                                );
                            },
                            function (sender, args) {
                                console.log("Failed to load subscription.");
                                console.log("Error: " + args.get_message() + "\n" + args.get_stackTrace());
                            }
                        );
                    }

I am getting this error message:

Subscription load success. Attempting to start workflow. OpenSubjects.aspx:806 Failed to start workflow. OpenSubjects.aspx:807 Error: Value cannot be null. Parameter name: subscription undefined

Answer 1

You seem to pass 3 parameters to you method, that only expects 2, and seem to have mixed up the order of them.

function startWorkflow(itemID, subID)

So you should first pass the itemID, the integet of the list item

And then the subscription id, the GUID of the workflow subscription.