The Backbone.JS Where() collection method is used to display the model by using the matched attribute in the collection.
Syntax:
Collection.Where ( attribute )
Parameters:
attribute: This parameter is used to specify the attribute of a model in a collection.
Example:
<title>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>
<script type="text/javascript">
var names = new Backbone.Collection([
{name: "Joy", id: 10},
{name: "Joy", id: 30},
{name: "Smiley", id: 20}
]);
var X = names.where({name: "Joy"});
document.write("Total matched name attribute:", + X.length);
</script>Total matched name attribute:2
<title>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>
<script type="text/javascript">
var names = new Backbone.Collection([
{name: "Joy", id: 10},
{name: "Joy", id: 30},
{name: "Smiley", id: 20}
]);
var X = names.where({name: "Joy"});
document.write("Total matched name attribute:", + X.length);
</script>Total matched name attribute:2
Example Total matched name attribute:2
Output:
Total matched name attribute:2
Total matched name attribute:2
Total matched name attribute:2
Explanation:
In the above example, the Where() method returns the number of matched value for the “name” attributes of the models in a collection.