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= type="text/javascript"> </script> <script src= type="text/javascript"> </script> <script src= type="text/javascript"> </script> </head> <body> <h1 style="color: green;"> neveropen </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> type="text/javascript"> </script> <script src= type="text/javascript"> </script> <script src= type="text/javascript"> </script> </head> <body> <h1 style="color: green;"> neveropen </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> |
Output:
Backbone.js isValid Model
Reference: https://backbonejs.org/#Model-isValid
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