Basic model implementation

Represents domain-specific data or information that an application will be working with. A typical example is a user account (e.g name, avatar, e-mail) or a music track (e.g title, year, album). Holds information, but don’t handle behaviour and don’t format information or influence how data appears.

cjs-model extends Emitter interface.

Installation

npm install cjs-model

Usage

Add the constructor to the scope:

var Model = require('cjs-model');

Create an empty instance:

var model = new Model();

Create an instance with some data:

var model = new Model({
    attr1: value1,
    attr2: value2,
});

Clear all data:

model.clear();

emits clear event in case some data is present

Clear and set new model data:

model.init({
    attr3: value3,
    attr4: value4,
});

can emit clear and init events

Check an attribute existence:

if ( model.has('attr3') ) {
    /* ... */
}

Get a model attribute value by name:

var value = model.get('attr1');

Update or create a model attribute:

var operationStatus = model.set('attr5', 'value5');

emits change event with prev field in data in case of update operation

Delete the given attribute by name:

var operationStatus = model.unset('attr5');

emits change event

Performance notes

It is highly advisable to access a model data directly in case no events are required.

So instead of

var value = model.get('attr1');
model.set('attr5', 'value5');

to avoid performance penalty it's better to use

var value = model.data.attr1;
model.data.attr5 = 'value5';

Development mode

There is a global var DEVELOP which activates additional consistency checks and protection logic not available in release mode.

Contribution

If you have any problem or suggestion please open an issue here. Pull requests are welcomed with respect to the JavaScript Code Style.

License

cjs-model is released under the MIT License.