javascript - backbone.js - how and when to show a spinner -

is there sort of hooks in backbone can "whenever of collections fetching data, show spinner, hide when they're done"?

i have feeling more complicated , require overwriting specific functions. when should show spinner? on fetch() or refresh() or else?

backbone doesn't trigger event when collection::fetch() starts (see source code), have override fetch method. maybe this:

var oldcollectionfetch = backbone.collection.prototype.fetch;  backbone.collection.prototype.fetch = function(options) {     this.trigger("fetch:started");     oldcollectionfetch.call(this, options); } 

this override fetch method give event when fetch starts. however, triggers event on specific collection instance if have bunch of different collections you'll have listen event on each collection.