In this article, we will discuss Backbone.js length collection. The Backbone.js length collection is used to return the total number of elements/values present in the model collection.
Syntax:
Backbone.Collection.length
Parameters: It takes no parameters.
Example 1: In this example, we will create a model array with one element and return the length.
HTML
<!DOCTYPE html> <html>
<head>
<script type="text/javascript" src=
</script>
<script type="text/javascript" src=
</script>
<script type="text/javascript" src=
</script>
</head>
<body>
<script type="text/javascript">
var data = Backbone.Model.extend({
defaults: {
id: "1",
name: "sravan kumar gottumukkala",
age: "67"
},
});
var data1 = Backbone.Collection.extend({
model: data
});
var final = new data1({});
document.write(
"Values:", JSON.stringify(final.toJSON())
);
document.write("<br>");
document.write("Length:", final.length);
</script>
</body>
</html>
|
Output:
Values:[{"id":"1","name":"sravan kumar gottumukkala","age":"67"}]
Length:1Example 2: In this example, we will create a model array with four elements and return the length.
HTML
<!DOCTYPE html> <html>
<head>
<script type="text/javascript" src=
</script>
<script type="text/javascript" src=
</script>
<script type="text/javascript" src=
</script>
</head>
<body>
<script type="text/javascript">
var datas = Backbone.Model.extend({
defaults: {
name: "sravan"
}
});
var datacollection = Backbone.Collection.extend({
model: datas
});
var data1 = new datas({ name: "ram" });
var data2 = new datas({ name: "shivam" });
var data3 = new datas({ name: "ramya" });
var data4 = new datas({ name: "deepu" });
var final = new datacollection();
final.add([data1, data2, data3, data4]);
document.write(
"Values:", JSON.stringify(final.toJSON())
);
document.write("<br>");
document.write("Length:", final.length);
</script>
</body>
</html>
|
Output:
Values:[{"name":"ram"},{"name":"shivam"},{"name":"ramya"},{"name":"deepu"}]
Length:4Reference: https://backbonejs.org/#Collection-length