backbone/collection-add-remove.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: {
		title: '',
		completed: false
	}
	});

	var TodosCollection = Backbone.Collection.extend({
  model: Todo
	});

	var a = new Todo({ title: 'Go to Jamaica.'}),
		b = new Todo({ title: 'Go to China.'}),
		c = new Todo({ title: 'Go to Disneyland.'});

	var todos = new TodosCollection([a,b]);
	console.log("Collection size: " + todos.length);
	// Logs: Collection size: 2

	todos.add(c);
	console.log("Collection size: " + todos.length);
	// Logs: Collection size: 3

	todos.remove([a,b]);
	console.log("Collection size: " + todos.length);
	// Logs: Collection size: 1

	todos.remove(c);
	console.log("Collection size: " + todos.length);
	// Logs: Collection size: 0
	console.log("2nd Project: ");
	var items = new Backbone.Collection;
	items.add([{ id : 1, name: "Dog" , age: 3}, { id : 2, name: "cat" , age: 2}]);
	items.add([{ id : 1, name: "Bear" }], {merge: true });
	items.add([{ id : 2, name: "lion" }]); // merge: false

	console.log(JSON.stringify(items.toJSON()));
	// [{"id":1,"name":"Bear","age":3},{"id":2,"name":"cat","age":2}]


</script>
</body>
</html>