Preloading Data in Angular2 Components: A Typescript Solution

Preloading data in Angular2 components can greatly improve the performance and user experience of your application. By loading data before the component is rendered, you can prevent delay and improve the perceived speed of your application.

Typescript Solution

To preload data in Angular2 components using Typescript, you can use the resolve property of the Route object. The resolve property allows you to define a function that will be called before the component is rendered, and the data returned by the function will be available to the component.

Here is an example of how to use the resolve property:

<route path="/example" component="ExampleComponent" resolve="{ data: ExampleResolver }"></route>

In this example, the ExampleComponent will be rendered when the path "/example" is navigated to. Before the component is rendered, the ExampleResolver function will be called, and the data returned by the function will be available to the ExampleComponent.

The ExampleResolver function should return a Promise or Observable that resolves to the data you want to preload. Here is an example of the ExampleResolver function:

import { Injectable } from '@angular/core';
import { Resolve } from '@angular/router';
import { Observable } from 'rxjs/Observable';

@Injectable()
export class ExampleResolver implements Resolve<any> {

  resolve() {
    return new Promise((resolve, reject) => {
      // Get data from API
      const data = this.http.get('/api/example');
      resolve(data);
    });
  }

}

In this example, the ExampleResolver function is defined as a class that implements the Resolve interface. The resolve function returns a Promise that gets data from an API and resolves the Promise with the data.

Conclusion

Preloading data in Angular2 components can greatly improve the performance and user experience of your application. By using the resolve property of the Route object, you can easily preload data in your components using Typescript. This can help prevent delay and improve the perceived speed of your application.