backbone/validation-complex.html at master · netsider/backbone · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title></title>
</head>
<body>
  <script src="jquery-1.11.2.js"></script>
  <script src="underscore.js"></script>
  <script src="backbone.js"></script>
  <script>
  var Todo = Backbone.Model.extend({
  defaults: {
    completed: false //,
	//title: "Hello World" //This will cause validation to return true.  Don't forget the comma ;)
  },
  validate: function(attributes){
	//console.log('Validation Ran!');
    if(attributes.title === undefined){
        //return 'Title undefined!';
		console.log('Title is undefined!');
    }
  },
  initialize: function(){
    console.log('This model has been initialized.');
    this.on("invalid", function(model, error){
        console.log('ERROR: ' + error);
    });
  }
});
	var myTodo = new Todo();
	myTodo.set('completed', true, {validate: true}); // Runs validation, because title isn't set
	myTodo.set({title: 'Russell'}, {validate: true});
	console.log('title: ' + myTodo.get('title'));
	console.log('completed: ' + myTodo.get('completed'));
</script>
</body>
</html>