Backbone Validations

Recycleable validations for Backbone models. Define, apply, and evaluate your own!

var StringValidator = Backbone.Validator.extend({
  validate: function (model) {
    var attribute = this.options.attribute;
    if (!_.isString(model.get(attribute))) {
      this.addError(model, attribute, 'must be a string');
    }
  }
});

var ValidatableModel = Backbone.Model.extend({
  validatesWith: [
    new StringValidator({ attribute: 'theAnswer' })
  ]    
});

var myModel = new ValidatableModel;

myModel.set({ theAnswer: 'Forty Two' }); // ok
myModel.set({ theAnswer: 42 }); // invalid!

Failing validations will set error messages on the model that can be used to debug over provide user feedback:

_.each(myModel.errors.theAnswer, function (message) {
  console.log('invalid because: ' + message);    
});

rjz/backbone.validation

Backbone Validations