Для рабочего процесса SharePoint 2013:
function StartWF() {
$.ajax({
url: _spPageContextInfo.siteAbsoluteUrl + "/_api/SP.WorkflowServices.WorkflowInstanceService.Current/StartWorkflowOnListItemBySubscriptionId(subscriptionId='BB20B816-2AEF-4299-B6BF-43910578BA8F',itemId=' " + $("#drpItem option:selected").text() + "')",
type: "POST",
contentType: "application/json;odata=verbose",
headers: {
"Accept": "application/json;odata=verbose",
"X-RequestDigest": $("#__REQUESTDIGEST").val()
},
success: function (data) {
alert('Workflow Trigger Successfully');
},
error: function (data) {
alert("Error");
}
});
}
Подробная информация в этой теме