no-view-onoff-binding.md

Prevent using on/off bindings inside views (no-view-onoff-binding)

Instead of using on and off methods to subscribe to model/collection events, use listenTo and stopListening methods. If you remove a view that uses on binding to the model events, view is not completely removed from the memory, because model still has reference to event handler function that lives inside the view. This can be avoided by using off before removing a view. Or by using listenTo function.

Rule Details

The following patterns are considered warnings:

Backbone.View.extend({
    initalize: function() {
        this.model.on("change", this.render);
    }
});

The following patterns are not warnings:

Backbone.View.extend({
    initialize: function() {
        this.listenTo(this.model, "change", this.render);
    }
});

When Not To Use It

If you destroy your models more often then you destroy your views, then you should use on method instead of listenTo. Or if you always use off method before destroying the view.

Further Reading

BackboneJS Documentation