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App configuration and startup

Application Startup

Aurelia allows you to configure the application startup in a couple of different ways. A quick setup where some defaults are assumed and a verbose setup where you can configure some of the framework-specific behaviors.

Quick startup

The quick startup approach is what most developers will choose.

import { RouterConfiguration } from '@aurelia/router';
import Aurelia, { StyleConfiguration } from 'aurelia';

import { MyRootComponent } from './my-root-component';

// By default host to element name (<my-root-component> for MyRootComponent),
// or <body> if <my-root-component> is absent.
Aurelia.app(MyRootComponent).start();

// Or load additional Aurelia features
Aurelia
  .register(
    RouterConfiguration.customize({ useUrlFragmentHash: false })
  )
  .app(MyRootComponent)
  .start();

// Or host to <my-start-tag>
Aurelia
  .register(
    RouterConfiguration.customize({ useUrlFragmentHash: false })
  )
  .app({
    component: MyRootComponent,
    host: document.querySelector('my-start-tag')
  })
  .start();

Verbose Startup

To start an Aurelia application, create a new Aurelia() object with a target host and a root component and call start().

import Aurelia, { StandardConfiguration } from 'aurelia';
import { ShellComponent } from './shell';

new Aurelia()
  .register(StandardConfiguration)
  .app({ host: document.querySelector('body'), component: ShellComponent })
  .start();

In most instances, you will not use the verbose approach to starting your Aurelia applications. The verbose approach is more aimed at developers integrating Aurelia into existing web applications and views.

Register a globally available custom element

Registering a single element

To make a custom element globally available to your application, pass the custom element constructor to the .register() method on your Aurelia app.

import { CardCustomElement } from './components/card';

// When using quick startup
Aurelia
  .register(...)
  .register(<any>CardCustomElement);
  .app({ ... })
  .start();

// When using verbose startup
new Aurelia()
  .register(...)
  .register(<any>CardCustomElement)
  .app({ ... })
  .start();

Register a set of elements

If you have a package that exports all your custom elements, you can pass the entire package to the .register() method on your Aurelia app.

src/components/index.ts:

export { CardCustomElement } from './card';
export { CollapseCustomElement } from './collapse';

src/main.ts:

import * as globalComponents from './components';

// When using quick startup
Aurelia
  .register(...)
  .register(<any>globalComponents)
  .app({ ... })
  .start();

// When using verbose startup
new Aurelia()
  .register(...)
  .register(<any>globalComponents)
  .app({ ... })
  .start();
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