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Backbone.js Model

Backbone.js models are the most important building blocks used to build backbone.js applications. It is also known as the heart of the JavaScript application. Model contains dynamic data and its logic. It performs various types of action on the data like validation, conversion, computed properties, access control etc.

Following is a list of methods that can be used to manipulate the Backbone.js Model:

Index Method Description
1. extend It extends Backbone.model class while creating your own backbone model.
2. initialize When model instance is created, the class's constructor gets called and it is invoked
By defining initialize function when model is created.
3. get It gets value of an attribute on the model.
4. set It sets the value of an attribute in the model.
5. escape It is similar to get function, but returns the html-escaped version of a model's attribute.
6. has It returns true, if attribute value defined with non-null value or non-undefined value.
7. unset It removes an attribute from a backbone model.
8. clear It removes all attributes, including id attribute from a backbone model.
9. id It is used to identify model entity uniquely.It can be set manually when model is created or populated and saved on the server.
10. idattribute It defines the model's unique identifier which contains the name of the class member that will be used as id.
11. cid It is auto generated client id by backbone which uniquely identify the model on the client.
12. attributes It is used to define the property of a model.
13. changed It changes all the attributes that have changed after setting the attributes using set() method.
14. defaults It sets a default value to a model and simply states that if the user doesn't specify any data, the model won't fall with empty property.
15. toJSON It returns copy of the attributes as an object for JSON stringification.
16. sync It is used to communicate with the server and to represents state of a model.
17. fetch It accepts the data from the server by delegating sync() method in the model.
18. save It saves the data of the model by delegating to sync() method which reads and save the model every time when backbone calls it.
19. destroy It is used to destroy or remove the model from the server by using the Backbone.sync method which releases http "delete" request.
20. validate If input is invalid, it returns specified error message or if input is valid, it doesn't specify anything and simply display the result.
21. validationError It display validation error, if validation fails or after the invalid event is triggered.
22. isValid It checks the model state by using validate() method and also checks validations for each attributes.
23. url It is used for the instance of the model and returns URL where model's resource is located.
24. urlRoot It enables the URL function by using the model id to generate the URL.
25. parse The returns the model?s data by passing through the response object and represents the data in JSON format.
26. clone It is used to create deep copy of a model or to copy one model object to another object.
27. hasChanged It returns TRUE, if the attributes have changed since the last set.
28. isNew It determines whether the model is a new or existing one.
29. changedAttributes It returns the model's attributes that have changed since the last set or becomes false, if there is no attribute.
30. previous It determines the previous value of the changed attribute.
31. previousAttributes It returns state of the all attributes prior to last change event.




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