Backbone.js isValid() Model

Last Updated : 14 Jul, 2022

The Backbone.js isValid() Model is a function that is used to check the state of the model in Backbone.js. It uses validate method to check the model. It checks validation for each attribute.

Syntax:

model.isValid( options );

Properties:

options: It is the options that which is passed to validate the method.

Example 1: In this example, we will illustrate isValid() function. We will use isValid() function without defining validate function.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>BackboneJS isValid Model</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/1.2.2/backbone-min.js"
        type="text/javascript"> 
    </script> 
</head> 
  
<body> 
    <h1 style="color: green;"> 
        GeeksforGeeks 
    </h1> 
    <h3>BackboneJS isValid Model</h3> 
    <script type="text/javascript"> 
        var Person = Backbone.Model.extend(); 
        var person = new Person(); 
        document.write('You mode state is  ', 
            person.isValid()); 
    </script> 
</body> 
  
</html>

Output:

Backbone.js isValid method

Example 2: In this example, we will use isValid() function and verify the age and non-emptiness of the name in model.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>BackboneJS isValid Model</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/1.2.2/backbone-min.js"
        type="text/javascript"> 
    </script> 
</head> 
  
<body> 
    <h1 style="color: green;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3>BackboneJS isValid Model</h3> 
      
    <script type="text/javascript"> 
        var Person = Backbone.Model.extend({ 
            validate: function (attributes, options) { 
                document.write("You data is validating...<br>"); 
                if (!attributes.name) { 
                    return ('Please enter the name!!!<br>'); 
                } 
  
                if (attributes.age < 25) { 
                    return ('You are age below required!!! '); 
                } 
            }, 
        }); 
        var person = new Person({ name: "hello", age: 20 }); 
        if (person.isValid()) document.write("You all data is valid"); 
        else document.write(person.validationError); 
    </script> 
</body> 
  
</html>