Exploring StickIt: Binding the length property from a backbone.Collection

Exploring the use of Backbone, Marionette (1.8.3), StickIt, and TypeScript to effectively bind the length of a Backbone collection in real-time as items are added or removed.

As someone new to StickIt, here's my current attempt:

export class SomeView extends marionette.CompositeView<backbone.Model, SomeItemView> {
(...)
bindings = {
    "[data-bind-observer=count]": {
        observe: ["collection.length"],
        onGet: (collection) => {
            return collection.length;
        }
    }
};

}

typescriptbackbone.jsmarionettebackbone-stickit

Answer №1

When working with Backbone 1.3.3, it is recommended to listen for the collection's update event. However, if you are constrained to using an older version of Backbone due to work requirements, here is a suitable solution:

ui:{
  'count': '[data-bind-observer=count]'
},
collectionEvents: {
    add: "updateCount",
    remove: "updateCount"
},
updateCount: function() {
   this.ui.count.text(this.collection.length);
},

If possible, consider upgrading to Backbone 1.3.3 or Marionette 3 for improved functionality.

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