Meteor define ReactiveVar to be accesible in .events and .helpers - meteor

Question

I am trying to define a new ReactiveVar variable to be accessible in all the template sections (ex. .events, .helpers, .rendered ...etc) as shown in my code below, yet I am always getting an error:
Error: Exception in template helper:
ReferenceError: logData is not defined
Can someone please tell me what I am missing / doing wrong here? Thanks
Code:
Template.detailedreport.rendered = function() {
var logData = new ReactiveVar;
logData.set([]);
};
Template.detailedreport.helpers({
myCollection: function () {
return logData.get();
}
});
Template.detailedreport.events({
'submit form': function(e) {
e.preventDefault();
var now = Session.get("startDate");
var then = Session.get("endDate");
var custID = Session.get("customer");
var projID = Session.get("project");
Meteor.call('logSummary', now, then, projID, custID, function(error, data){
if(error)
return alert(error.reason);
logData.set(data);
});
}
});

Answer 1

You need to define the ReactiveVar on the template instance like this :
Template.detailedreport.created = function() {
this.logData = new ReactiveVar([]);
};
Then you'll be able to access it in helpers like this :
Template.detailedreport.helpers({
myCollection: function () {
return Template.instance().logData.get();
}
});
In events you can use the template argument :
Template.detailedreport.events({
'submit form': function(e, template) {
e.preventDefault();
var now = Session.get("startDate");
var then = Session.get("endDate");
var custID = Session.get("customer");
var projID = Session.get("project");
Meteor.call('logSummary', now, then, projID, custID, function(error, data){
if(error){
return alert(error.reason);
}
template.logData.set(data);
});
}
});