docs(cb-rating-component): cookbook about creating a rating component

Author: Foxandxss

public/docs/_examples/cb-rating-component/e2e-spec.js

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+describe('Rating compomnent', function () {
+  
+  beforeAll(function () {
+    browser.get('');
+  });
+  
+  it('should show 5 stars for windstorm', function () {
+    var windstormRating = element.all(by.tagName('my-hero-rating')).get(0);
+    var windstormStars = windstormRating.all(by.css('.glyphicon-star'));
+    expect(windstormStars.count()).toBe(5);
+  });
+  
+  it('should show 1 star for bombasto', function() {
+    var bombastoRating = element.all(by.tagName('my-hero-rating')).get(1);
+    var bombastoStars = bombastoRating.all(by.css('.glyphicon-star'));
+    expect(bombastoStars.count()).toBe(1);
+  });
+  
+  it('should change the rate on click', function() {
+    var bombastoRating = element.all(by.tagName('my-hero-rating')).get(1);
+    var bombastoFourthStar = bombastoRating.all(by.css('.glyphicon')).get(3);
+    bombastoFourthStar.click().then(function() {
+      var bombastoStars = bombastoRating.all(by.css('.glyphicon-star'));
+      expect(bombastoStars.count()).toBe(4);
+      
+      var div = element.all(by.tagName('div')).get(0);
+      expect(div.getText()).toEqual('Bombasto rate is 4');
+    });
+  });
+});

public/docs/_examples/cb-rating-component/ts/.gitignore

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+**/*.js

public/docs/_examples/cb-rating-component/ts/app/app.component.1.ts

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+// #docregion
+import { Component } from '@angular/core';
+
+import { HeroRatingComponent } from './rating.component';
+
+@Component({
+  selector: 'my-app',
+  template: `
+    <label>Windstorm: </label>
+    <my-hero-rating></my-hero-rating>
+  `,
+  directives: [HeroRatingComponent]
+})
+export class AppComponent { }
+// #enddocregion

public/docs/_examples/cb-rating-component/ts/app/app.component.ts

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+import { Component } from '@angular/core';
+
+import { HeroRatingComponent } from './rating.component';
+
+@Component({
+  selector: 'my-app',
+  template: `
+    <p>
+      <label>Windstorm: </label>
+      <my-hero-rating rate="5"></my-hero-rating>
+    </p>
+    <p>
+      <label>Bombasto: </label>
+      <my-hero-rating [(rate)]="bombasto"></my-hero-rating>
+    </p>
+    <div>Bombasto rate is {{bombasto}}</div>
+  `,
+  directives: [HeroRatingComponent]
+})
+export class AppComponent {
+  bombasto: number = 1;
+}

public/docs/_examples/cb-rating-component/ts/app/main.ts

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+import { bootstrap }    from '@angular/platform-browser-dynamic';
+
+import { AppComponent } from './app.component';
+
+bootstrap(AppComponent, [])
+  .catch((err: any) => console.error(err));

public/docs/_examples/cb-rating-component/ts/app/rating.component.1.ts

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+// #docregion
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'my-hero-rating',
+  template: '<div>Rating</div>'
+})
+export class HeroRatingComponent { }
+// #enddocregion

public/docs/_examples/cb-rating-component/ts/app/rating.component.2.ts

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+// #docregion
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'my-hero-rating',
+  // #docregion template
+  template: `
+    <template ngFor [ngForOf]="range" let-index="index">
+      <span class="sr-only">(*)</span>
+      <i class="glyphicon glyphicon-star"></i>
+    </template>
+  `
+  // #enddocregion template
+})
+export class HeroRatingComponent { }
+// #enddocregion

public/docs/_examples/cb-rating-component/ts/app/rating.component.3.ts

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+// #docregion
+import { Component, Input } from '@angular/core';
+
+@Component({
+  selector: 'my-hero-rating',
+  // #docregion template
+  template: `
+    <template ngFor [ngForOf]="range" let-index="index">
+      <span class="sr-only">({{ index < rate ? '*' : ' ' }})</span>
+      <i class="glyphicon {{index < rate ? 'glyphicon-star' : 'glyphicon-star-empty'}}"></i>
+    </template>
+  `
+  // #enddocregion template
+})
+export class HeroRatingComponent {
+  @Input() rate: number;
+  // #docregion update-method
+  update(value: number) {
+    this.rate = value;
+  }
+  // #enddocregion
+}
+// #enddocregion

public/docs/_examples/cb-rating-component/ts/app/rating.component.ts

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+// #docregion
+import { Component, EventEmitter, Input, Output } from '@angular/core';
+
+@Component({
+  selector: 'my-hero-rating',
+  // #docregion rating-template
+  template: `
+    <template ngFor [ngForOf]="range" let-index="index">
+      <span class="sr-only">({{ index < rate ? '*' : ' ' }})</span>
+      <i class="glyphicon {{index < rate ? 'glyphicon-star' : 'glyphicon-star-empty'}}" (click)="update(index + 1)"></i>
+    </template>
+  `
+  // #enddocregion rating-template
+})
+export class HeroRatingComponent {
+  // #docregion range-attribute
+  range = new Array(5);
+  // #enddocregion range-attribute
+
+  // #docregion rate-input
+  @Input() rate: number;
+  // #enddocregion rate-input
+  // #docregion rate-output
+  @Output() rateChange: EventEmitter<number> = new EventEmitter<number>();
+  // #enddocregion rate-output
+
+  // #docregion update-method
+  update(value: number) {
+    this.rate = value;
+    this.rateChange.emit(value);
+  }
+  // #enddocregion update-method
+}
+// #enddocregion

public/docs/_examples/cb-rating-component/ts/demo.css

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+<!DOCTYPE html>
+<html>
+  <head>
+    <base href="/">
+    <title>Rating component</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <!-- #docregion style -->
+    <link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.min.css">
+    <link rel="stylesheet" href="styles.css">
+    <link rel="stylesheet" href="demo.css">
+    <!-- #enddocregion style -->
+
+    <!-- Polyfill(s) for older browsers -->
+    <script src="node_modules/core-js/client/shim.min.js"></script>
+
+    <script src="node_modules/zone.js/dist/zone.js"></script>
+    <script src="node_modules/reflect-metadata/Reflect.js"></script>
+    <script src="node_modules/systemjs/dist/system.src.js"></script>
+
+    <script src="systemjs.config.js"></script>
+    <script>
+      System.import('app').catch(function(err){ console.error(err); });
+    </script>
+  </head>
+
+  <body>
+    <my-app>Loading app...</my-app>
+  </body>
+
+</html>

public/docs/_examples/cb-rating-component/ts/example-config.json

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+{
+  "description": "Rating Component",
+  "files":[
+    "!**/*.d.ts",
+    "!**/*.js",
+    "!**/*.[1,2,3].*"
+  ],
+  "tags":["cookbook"]
+}

public/docs/_examples/cb-rating-component/ts/index.html

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   "ts-to-js": {
     "title": "TypeScript to JavaScript",
     "intro": "Convert Angular 2 TypeScript examples into ES5 JavaScript"
+  },
+  
+  "rating-component": {
+    "title": "Rating Component",
+    "intro": "Learn how to write a rating component"
   }
 }

public/docs/_examples/cb-rating-component/ts/plnkr.json

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+include ../_util-fns
+
+:marked
+  In this cookbook we will show how to build a custom rating directive with two-way databinding.
+  <a id="top"></a>
+  ## Table of contents
+  
+    [A static rating component](#static-component)
+    
+    [Adding inputs](#inputs)
+    
+    [Reacting to clicks](#clicks)
+    
+    [Adding outputs](#outputs)
+  
+:marked
+  **See the [live example](/resources/live-examples/cb-rating-component/ts/plnkr.html)**.
+  
+.l-main-section
+<a id="static-component"></a>
+:marked
+  ## A static rating component
+  
+  The first thing we are going to do is to create an static rating component. Let's start with the basic skeleton.
+  
++makeExample('cb-rating-component/ts/app/rating.component.1.ts', null, 'rating.component.ts (skeleton)')(format=".")
+
+:marked
+  Our next step would be to print our 5 stars. To do that, we need to output some HTML.
+  For each star, we want to output two elements: We want the star itself which we can see and click, and also an invisible star that we will use for accesibility.
+  This means that we need `ngFor` to generate not only one element, but two.
+  
+  What we can do here, is to de-sugar `ngFor` into its complete version. That will allow us to to generate as many elements as we need.
+  
++makeExample('cb-rating-component/ts/app/rating.component.2.ts', 'template', 'rating.component.ts (template)')(format=".")
+
+.l-sub-section
+  :marked
+    Learn more about this syntax at the [Template Syntax](../guide/template-syntax.html#!#star-template) chapter and [Structural Directives](../guides/structural-directives.html#!#asterisk).
+
+:marked
+  So here we say that we want a `<template>` element (the element itself won't output any markup) with the `ngFor` directive in it.
+  We give to it the collection we want to repeat, `range`, and also that we want a reference to the current index in the collection.
+  Notice that we aren't getting a reference to the current item on the `range` collection, we don't need it. We just need to generate that template as many times as we need.
+  
+  We need to create that range collection now.
+
++makeExample('cb-rating-component/ts/app/rating.component.ts', 'range-attribute', 'rating.component.ts (class)')(format=".")
+
+:marked
+  Let's update our app component to see it in action.
+  
++makeExample('cb-rating-component/ts/app/app.component.1.ts', null, 'app.component.ts')(format=".")
+
+:marked
+  If we check our browser now, we can see it working.
+  
+figure.image-display
+  img(src="/resources/images/cookbooks/rating-component/static-component.png" alt="Static Component")  
+
+:marked
+  And also the desired markup.
+  
+figure.image-display
+  img(src="/resources/images/cookbooks/rating-component/generated-output.png" alt="Generated Output")
+  
+<a id="inputs"></a>
+:marked
+  ## Adding inputs
+  
+  But not all heroes are as awesome as Windstorm! We should be able to initialize our rating component with a different value. That means that we need an input.
+  
++makeExample('cb-rating-component/ts/app/rating.component.ts', 'rate-input', 'rating.component.ts (class)')(format=".")
+
+:marked
+  With the input we just need to apply a class or another.
+  
++makeExample('cb-rating-component/ts/app/rating.component.3.ts', 'template', 'rating.component.ts (template)')(format=".")
+
+:marked
+  Now that we have the input, we can use it with static or dynamic values.
+  
+code-example(language="html", format=".")
+  &lt;my-hero-rating rate="3"&gt;&lt;/my-hero-rating&gt;
+  &lt;my-hero-rating [rate]="rate"&gt;&lt;/my-hero-rating&gt;
+  
+<a id="clicks"></a>
+:marked
+  ## Reacting to clicks
+  
+  Bombasto is not a bad hero, let's make the rating clickable.
+  
++makeExample('cb-rating-component/ts/app/rating.component.ts', 'rating-template', 'rating.component.ts (template)')(format=".")
+
+:marked
+  By clicking a star, we update our internal `rate` with the new value.
+  
++makeExample('cb-rating-component/ts/app/rating.component.3.ts', 'update-method', 'rating.component.ts (class)')(format=".")
+
+figure.image-display
+  img(src="/resources/images/cookbooks/rating-component/click.gif" alt="Static Click")
+  
+<a id="outputs"></a>
+:marked
+  ## Adding outputs
+  
+  When clicking the rating component, we want the updated rate back, so we need an output.
+  
++makeExample('cb-rating-component/ts/app/rating.component.ts', 'rate-output', 'rating.component.ts (class)')(format=".")
+
+:marked
+  And we push the new rate in a click.
+  
++makeExample('cb-rating-component/ts/app/rating.component.ts', 'update-method', 'rating.component.ts (class)')(format=".")
+
+:marked
+  That allows us to do two-way databinding.
+  
+code-example(language="html", format=".")
+  &lt;my-hero-rating [(rate)]="rate"&gt;&lt;/my-hero-rating&gt;
+  
+:marked
+  Here is the complete source for the rating component.
+  
++makeExample('cb-rating-component/ts/app/rating.component.ts', null, 'rating.component.ts')(format=".")
+
+:marked
+  [Back to top](#top)