Meteor Client Async Pattern / How To Implement A WaitOn For A List Of Subscriptions W Callbacks

for various reasons I'm writing an app that doesn't use IronRouter, but has to implement some similar logic. One is waiting for a list of subscriptions to be ready. Since this is a

Solution 1:

I'm not sure what your startMainLoop is like, but here's an approach that might work for you. Create a new template which just checks if all the subscriptions are ready; if they are it renders the real main template, and if they aren't then it renders a loading template.

<template name="subscriptionsReadyCheck">
  {{#if allSubsAreReady}}
    {{> mainTemplate}}
  {{else}}
    {{> loadingTemplate}}
  {{/if}}
</template>

subList = [...]

Template.subscriptionsReadyCheck.helpers {
  allSubsAreReady: -> _.every(subList, (sub) -> sub.ready())
}

This assumes that the subscriptions are created when the page loads and stays around until the page is closed. If you need subscriptions which are only created when the template is rendered and are stopped when the template is destroyed, you can store them on the template instance:

Template.subscriptionsReadyCheck.created = ->
  @subList = [...]

Template.subscriptionReadyCheck.destroyed ->
  for sub in @subList
    sub.stop()

Template.subscriptionsReadyCheck.helpers {
  allSubsAreReady: -> _.every(Template.instance().subList, (sub) -> sub.ready())
}