Backbone.js isNew Model
Last Updated :
13 Jun, 2022
In this article, we will learn about the Backbone.js isNew model. The isNew model is used to represent a new state, which is when the details are not yet saved to the server. It will return a Boolean value. If it is true, it will return true, otherwise false.
Syntax:
Backbone.Model.isNew()
Parameters: It method does not accept any parameters.
Example 1: In this example, we will check if the book attribute is new using isNew.
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 Books = Backbone.Model.extend();
var book = new Books(
{ book_name: "css", price: 900, type: "web" }
);
document.write(book.isNew());
</script>
</body>
</html>
|
Output:
true
Example 2: In this example, we will check if the book attribute is new using isNew. It will return false as the ID has been set after it had been saved.
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 Books = Backbone.Model.extend();
var book = new Books();
// Logic for saving to the server
Backbone.sync = function (method, model) {
model.set('id', 100);
};
book.save();
// Will return false as the ID has
// been set after it had been saved
document.write(book.isNew())
</script>
</body>
</html>
|
Output:
false
Reference: https://backbonejs.org/#Model-isNew
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