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BackboneJS - Collection Comparator
Description
There is no comparator for a collection. To maintain the collection in a sorted order, we use the comparator property.
Syntax
collection.comparator
Example
<!DOCTYPE html> <html> <head> <title>Collection Example</title> <script src = "https://code.jquery.com/jquery-2.1.3.min.js" type = "text/javascript"></script> <script src = "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type = "text/javascript"></script> <script src = "https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type = "text/javascript"></script> </head> <body> <script type = "text/javascript"> var MyModel = Backbone.Model.extend(); //'LangNames' is a model name //'mydata' variable contains values to be displayed in sorted order var mydata = [ {id:4, f_name: 'smith'}, {id:2, f_name: 'cruise'}, {id:3, f_name: 'john'} ]; //'myval' is a collection instance and includes array of values stored in 'mydata' variable var myval = new Backbone.Collection (mydata, { model:MyModel, //The model 'MyModel' is specified by overriding the "model" property comparator: 'f_name' //The 'comparator' maintain the collection in sorted order }); //Here, displaying the array of values using collection instance 'myval' and 'models' method document.write("The sorted (based on f_name) order of collection: <br>", JSON.stringify(myval) ); </script> </body> </html>
Output
Let us carry out the following steps to see how the above code works −
Save the above code in the comparator.htm file.
Open this HTML file in a browser.
backbonejs_collection.htm
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