What are the configuration options available in Backbone.js?

In Backbone.js, there are several configuration options available to customize its behavior and functionality. Some of the commonly used configuration options include:

1. model: This option allows you to specify the model class that the collection should use. For example:
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   var Library = Backbone.Collection.extend({
model: Book
});

2. url: Specifies the URL endpoint from which the collection should fetch or save its models.
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   var Books = Backbone.Collection.extend({
url: '/books'
});

3. initialize: A function that is called when a new instance of the collection is created. This is useful for setting up initial state or event listeners.
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   var Library = Backbone.Collection.extend({
initialize: function() {
// Initialize code here
}
});

4. comparator: A function that defines the sorting order of models within the collection.
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   var SortedCollection = Backbone.Collection.extend({
comparator: function(model) {
return model.get('name');
}
});

5. parse: A function that is used to parse the server response before it is set on the collection. This is useful for customizing how data is handled when fetched from the server.
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   var Books = Backbone.Collection.extend({
parse: function(response) {
return response.data;
}
});

6. sync: Overrides Backbone’s default syncing behavior with a custom implementation.
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   var Books = Backbone.Collection.extend({
sync: function(method, collection, options) {
// Custom sync implementation
}
});

7. fetch options: These are options that are passed to the fetch method, such as reset, data, success, error, etc., allowing customization of the AJAX request made to the server.
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   books.fetch({
reset: true,
data: {
category: 'fiction'
},
success: function(collection, response, options) {
// Success callback
},
error: function(collection, response, options) {
// Error callback
}
});


These are some of the common configuration options available in Backbone.js. Depending on your application’s requirements, you may use additional options or customize these to suit your needs.