Plugin Configuration

A closer look at registering the Aurelia Validation plugin

Like all Aurelia plugins, you'll usually configure them inside your file. Importing the configuration object from the validation package and passing it into the register method provided by Aurelia is all you need to do to register it.

In the previous step here, we already went over this. Make sure you have the plugin and relevant adapters installed before continuing.

import { ValidationHtmlConfiguration } from '@aurelia/validation-html';
import Aurelia from 'aurelia';

Aurelia
  .register(ValidationHtmlConfiguration)
  .app(component)
  .start();

This sets up the plugin with the required dependency registrations. You can also customize the validation plugin via the customize method, which provides an options object we can use to configure default settings.

import { ValidationHtmlConfiguration } from '@aurelia/validation-html';
import Aurelia from 'aurelia';

Aurelia
  .register(ValidationHtmlConfiguration.customize((options) => {
    // customization callback
    options.DefaultTrigger = customDefaultTrigger;
  }))
  .app(component)
  .start();

The following options are available for customization.

• From @aurelia/validation

  • ValidatorType: Custom implementation of IValidator. Defaults to StandardValidator.

  • MessageProviderType: Custom implementation of IValidationMessageProvider. Defaults to ValidationMessageProvider.

  • ValidationControllerFactoryType: Custom implementation of the factory for IValidationController; Defaults to ValidationControllerFactory.

  • CustomMessages: Custom validation messages.

• From @aurelia/validation-html

  • HydratorType: Custom implementation of IValidationExpressionHydrator. Defaults to ModelValidationExpressionHydrator.

  • DefaultTrigger: Default validation trigger. Defaults to blur.

  • UseSubscriberCustomAttribute: Use the validation-errors custom attribute. Defaults to true.

  • SubscriberCustomElementTemplate: Custom template for validation-container custom element. Defaults to the default template of the custom element.

These options are explained in detail in their respective sections. Note that the categorization of the options is done with the intent of clarifying the origin package of each option. However, as the @aurelia/validation-html wraps @aurelia/validation all the customization options are available when the @aurelia/validation-html package is registered.

The @aurelia/validation-i18n package is skipped intentionally for now, as discussed in detail later.