You'll learn how to add validation to your applications using a fluent rule API and minimal changes to your templates.
To get started you'll need to install aurelia-validation using npm install aurelia-validation or jspm install aurelia-validation. Afterwards, add .plugin(PLATFORM.moduleName('aurelia-validation')) to the configuration in your main.js to ensure the plugin is loaded at application startup.
Defining Rules : Aurelia Validation's standard rule engine uses a fluent syntax to define a set of rules.
There are five parts to the syntax :
* Selecting a property using .ensure
* Associating rules with the property using .required, .matches, etc
* Customizing property rules using .withMessage, .when, etc
* Sequencing rules using .then
* Applying the ruleset to a class or instance using .on
