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angular-properties-workshop's Introduction

Taller de Angular

Resultado

Autor: Eduardo Oviedo Blanco

Para usar este taller efectivamente, clone el código en su ambiente local.

git clone https://github.com/edWAR6/angular-properties-workshop.git

Si desea subir el taller en su repositorio personal. Cree un repositorio en su perfil, luego:

git remote set-url origin https://github.com/<su usuario>/angular-properties-workshop.git

El nombre del repositorio puede cambiar. Siga las instrucciones y guarde sus cambios.

Propósito

Este taller demuestra el uso de Angular properties.

Instrucciones

  1. Ejecute el proyecto desde el inicio para que vea los cambios según avanza.
ng serve
  1. Agregue (en la línea 25) una elemento imágen.
<div class="media">
    <img class="mr-3 rounded align-self-center img-fluid" style="width:70px" src="" alt="">
    <div class="media-body align-self-center">
  1. Haciendo uso de una expresión, agregue un src a la imágen.
<img class="mr-3 rounded align-self-center img-fluid" style="width:70px" 
    src="{{ './assets/images/' + artist.shortname + '_tn.jpg' }}" alt=""
>
  1. Ahora agregue una expresión, para el alt de la imágen.
<img class="mr-3 rounded align-self-center img-fluid" style="width:70px" 
    src="{{ './assets/images/' + artist.shortname + '_tn.jpg' }}"
    alt="{{ 'Photo of ' + artist.name }}"
>

La expresión sin embargo puede ser interpretada antes de que la imagen esté cargada, lo cual genera muchos problemas.

  1. Cambie las expresiones por propiedades.
<img class="mr-3 rounded align-self-center img-fluid" style="width:70px" 
    [src]="'./assets/images/' + artist.shortname + '_tn.jpg'"
    [alt]="'Photo of ' + artist.name"
>
  1. Para lograr mostrar cuales items de la lista fueron seleccionados, cambie la propiedad del color de fondo al anchor.
<a href="#" class="list-group-item list-group-item-action flex-column align-items-start"
    *ngFor="let artist of artists"
    (click)="showArtist(artist)"
    [style.background]="artist.highlight ? '#eee' : '#fff'">
  1. Note como tenemos un error debido al tipo, según la interfaz de artist. Arregle la interfaz para corregir este problema.
interface IArtist {
  name: string,
  shortname: string,
  reknown: string,
  bio: string,
  highlight?: boolean,
}
  1. Cambie la función del evento click para cambiar este valor.
showArtist(artist: IArtist) {
    this.query = artist.name;
    artist.highlight = !artist.highlight;
}  

AngularProperties

This project was generated with Angular CLI version 12.1.2.

Development server

Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Code scaffolding

Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.

Build

Run ng build to build the project. The build artifacts will be stored in the dist/ directory.

Running unit tests

Run ng test to execute the unit tests via Karma.

Running end-to-end tests

Run ng e2e to execute the end-to-end tests via a platform of your choice. To use this command, you need to first add a package that implements end-to-end testing capabilities.

Further help

To get more help on the Angular CLI use ng help or go check out the Angular CLI Overview and Command Reference page.

angular-properties-workshop's People

Contributors

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Watchers

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