reusing-an-existing-view-model.md

Reusing an Existing View Model

By default, Aurelia creates a new view model instance for each navigation. However, you can control this behavior using the determineActivationStrategy hook.

import { activationStrategy } from 'aurelia-router';

export class MyViewModel {
  determineActivationStrategy() {
    return activationStrategy.replace;
  }
}

Available strategies are:

• activationStrategy.replace: Create a new instance of the view model
• activationStrategy.invokeLifecycle: Reuse the existing view model, but call the lifecycle hooks

You can also specify the activation strategy in the route config:

config.map([
  { 
    route: 'reused',
    name: 'reused',
    moduleId: PLATFORM.moduleName('reused/index'),
    activationStrategy: activationStrategy.invokeLifecycle
  }
]);

This approach is useful when you want to reuse a view model but still refresh its data or state when navigating to it.