Template-level subscriptions are great, but how do you know when they’re done loading? What if there was a way to execute a callback once all your data is there?
Well, now there is thanks to a super-simple little package I just created:
https://atmospherejs.com/utilities/onsubscribed
Template.myTemplate.onCreated(function () {
this.subscribe("mySubscription");
});
Template.myTemplate.onSubscribed(function () {
console.log("subscription done!");
});
Does it only fire once? Or if I make additional subscriptions will it fire again?
Right now it only fires once:
Template.prototype.onSubscribed = function(callback) {
var template = this;
template.onCreated(function() {
var templateInstance = this;
templateInstance.autorun(function(computation) {
if (templateInstance.subscriptionsReady()) {
callback.bind(templateInstance)();
computation.stop();
}
});
});
};
But I guess we could just not stop the computation, and it would reactively fire every time subscriptionsReady() changes?
Hey! That looks alot like what I’m doing by hand atm.
Tracker.autorun(function () {
// wait for startup to be ready before running this code
if (!Mk.Subs.startup.ready()) return;
Tracker.currentComputation.stop();
self.subscribe('organisation', lastMsg.organisationId, {
onReady: function () {...}
});
})
That first line though is because if a user starts on a certain page, I have global subscriptions that need to finish as well as the template level subscription. So I put that in to wait for both global level subscriptions and template level ones!
What I’d want to see is:
var subHandle = Template.instance().subscribe(...) || Meteor.subscribe(...)
Meteor.onReady(subHandle, function () {
});
It would be good to be able to use this in templates or outside of them. Not sure if these two methods of subscription can be combined.
Yeah, I would love for it to be easier to use template-level subscriptions in combination with SubsManager cached subscriptions or any other global subscriptions.
So it’d be great if there was an easy syntax to build a handler that waits for any number of subscriptions.