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BackboneJS - Model Validate
Description
It validates the model and input provided by the user. If the input is invalid, it returns a specified error message or if the input is valid, it doesn't specify anything and simply displays the result.
Syntax
model.validate(attributes,options)
Parameters
attributes − These attributes define the property of a model.
options − It includes true as an option to validate the attributes.
Example
<!DOCTYPE html> <html> <head> <title>Model 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> </head> <body> <script type = "text/javascript"> var Person = Backbone.Model.extend ({ defaults: { name: 'john', age: 25, occupation: 'working' }, initialize : function() { this.on("invalid",function(model,error) { document.write(error); }); }, validate: function(attributes) { if ( attributes.age < 25 ) { return 'Person age is less than 25, please enter the correct age!!! '; } if ( ! attributes.name ) { return 'please enter the name!!!'; } }, }); var person = new Person(); person.on('invalid', function() { this.arguments; }); person.set({ age : '20' }, { validate : true }); </script> </body> </html>
Output
Let us carry out the following steps to see how the above code works −
Save the above code in the validate.htm file.
Open this HTML file in a browser.
backbonejs_model.htm
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