backscatter

A reactive library for Backbone

Backscatter is a small library that notifies you of events anywhere in your Backbone model tree, no matter how deeply-nested they are. It's a great companion to React, since it enables you to carelessly trigger refreshes of your entire React tree whenever one or more base model(s) or their nested members change.

Installation

NPM

npm install backscatter

Types of intercepted events

Backscatter is a "catchall" listener. Anything that triggers an "all" event on your Model/Collection will be relayed by it.

createFactory(BackboneClass) -> BackboneClass

If you already have custom Backbone models and collections defined in your projects, you can extend them using "createFactory" so they can be used by Backscatter.

Backscatter.Model / Backscatter.Collection

An extension of Backbone's native Model and Collection which contains "backscatterOn" and "backscatterOff"

backscatterOn(handler)

handler will be called whenever the Model/Collection backscatterOn is invoked on or any of its decendants (close or remote) trigger an 'all' event.

The arguments passed to handler are Backbone's original 'all' event-handler arguments (target, event name etc.)

handler might be triggered several times sequently. For instance: Models that are members of a collection will trigger one event for the model, and another for the collection they're in, both will be intercepted by handler. Since you may be interested only in one of them, you can use underscore ".debounce()"

backscatterOff(handler)

Removes the binding to `handler'. It's best to call this when the view hosting your react component dies.

Example

import _ from 'underscore';
import Backbone from 'backbone';
import Backscatter from './lib/backscatter.js';
import React from 'react';
 
class MyCustomComponent extends React.Component {
    render(){
        return <div>{ this.props.title }, { this.props.name }</div>
    }
}
 
// This model is an example of an existing model that's extended to enable backscatter updates (see "createFactory")
let MyExistingModel = Backbone.Model.extend({ defaults: { id: "name", name: "John Doe" } });
 
let A = new Backscatter.Model({ id: "title", "title": `Howdy` }),
    B = new (Backscatter.createFactory(MyExistingModel)),
    C = new Backscatter.Model({ "a": A, "b": B }),
    D = new Backscatter.Collection([C]);
 
let renderComponent = function(){
    React.render(React.createElement(MyCustomComponent, { title: D.at(0).get('a').get('title'), name: D.at(0).get('b').get('name') }), document.querySelector('body'));
};
 
// Set backscatter to render your component whenever there are changes to your model
D.backscatterOn(_.debounce(function(...[target, name]){
    console.log(`We've got a change on "${target.id}" with event name "${name}"`)
    renderComponent();
}));
 
// Perform a change somewhere in your model, and let backscatter react
setTimeout(function(){
    // Let's touch our model somewhere in a deeply nested location
    A.set({ "title": `Hello` })
}, 1000);
 
setTimeout(function(){
    // Let's touch our model somewhere else in a deeply nested location
    B.set({ "name": `Mark Smith` })
}, 2000);
 
renderComponent();