10. Learn backbone.js tutorial from scratch for beginners(Part 13) Model Validation in backbone.js

C:\Users\Administrator\Desktop\gulp\app.js

jQuery(document).ready(function($) {
  var FirstModel = Backbone.Model.extend({
    initialize: function() {
      this.validate();
    },
    validate: function(attributes) {
    	if(attributes && attributes.age < 1) {
    		return "Age must be negative.";
    	}
    }
  });
  fmodel = new FirstModel({
  	
  });
  fmodel.set({
  	name: "Tuong",
  	team: "Solution",
  	age: 0
  });
  var ModelView = Backbone.View.extend({
  	model: fmodel,
  	initialize: function() {
  		this.render();
  	},
  	render: function() {
  		console.log(this.model.toJSON());
  	}
  });
  vmodel = new ModelView();
});

C:\Users\Administrator\Desktop\gulp\app.js

jQuery(document).ready(function($) {
  var FirstModel = Backbone.Model.extend({
    initialize: function() {
      this.validate();
    },
    validate: function(attributes) {
    	if(attributes && attributes.age < 1) {
    		return "Age must be negative.";
    	}
    }
  });
  fmodel = new FirstModel({
  	
  });
  fmodel.set({
  	name: "Tuong",
  	team: "Solution",
  	age: 0
  });
  var ModelView = Backbone.View.extend({
  	model: fmodel,
  	initialize: function() {
  		this.render();
  	},
  	render: function() {
  		if(this.model.isValid()) {
  			console.log("Valid values are false");
  		}else {
  			console.log(this.model.validationError);
  		}
  		console.log(this.model.toJSON());
  	}
  });
  vmodel = new ModelView();
});