Meteor Iron Router Run function when collection changes -

im new meteor , im trying figure out how run function after collection change.

i have route(iron router) subscribes collection waiton. waits subscrition ready before rendering want.

    waiton: function () {         return meteor.subscribe('collection', this.params._id);     }, 

any changes collection updated on clients , rendered automatically.

how run function once collection has changed?

you can use ondata hook, provided you're returning data using data helper. e.g route may like

this.route('routename',     path : '/abc',     waiton: function () {         return meteor.subscribe('collection', this.params._id);     },     data: function() {         return collection.findone({_id: this.params.id});     }     ondata: function() {          //do when data found above changes     } });