(docs) User Input - refactored to its own example and support blur event
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@ -78,9 +78,7 @@
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<button on-click="onSave()">On Save</button>
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<button (click)="onSave() || true">Save w/ propagation</button>
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<!-- #docregion click-me-button -->
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<button (click)="onClickMe()">Click me!</button>
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<!-- #enddocregion click-me-button -->
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<div class="parent-div" (click)="onClickMe($event)">Click me
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<div class="child-div">Click me too!</div>
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@ -1,13 +1,14 @@
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//**** Referenced in template-syntax and user-input chapters
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// #docplaster
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// NOT EVERYTHING IS NEEDED BY TEMPLATE-SYNTAX CHAPTER
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// Much left-over from support for "User Input" chapter such as
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// ClickMeComponent,
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// KeyUpComponent, KeyUpComponentV2, KeyUpComponentV3,
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// LittleTour, LoopbackComponent,
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// TODO: purge extraneous material
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// imports formatted for dev guide only
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// #docregion little-tour-of-heroes-app
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import {bootstrap, Component, CORE_DIRECTIVES} from 'angular2/angular2';
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// #enddocregion little-tour-of-heroes-app
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import {
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/// #docplaster
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import {bootstrap, Component, CORE_DIRECTIVES,
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Input, Output,
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Directive,
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ElementRef, EventEmitter,
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@ -93,7 +94,6 @@ class LittleHeroComponent {
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hero: Hero;
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}
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// #docregion click-me-component
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@Component({
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selector: 'click-me',
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template: '<button (click)="onClickMe()">Click me</button>'
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@ -103,18 +103,14 @@ class ClickMeComponent {
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alert('You are my hero!')
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}
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}
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// #enddocregion click-me-component
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// #docregion loop-back-component
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@Component({
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selector: 'loop-back',
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template: '<input #box (keyup)="0"> <p>{{box.value}}</p>'
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})
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class LoopbackComponent {
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}
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// #enddocregion loop-back-component
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// #docregion key-up-component
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@Component({
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selector: 'key-up',
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template: `
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@ -129,9 +125,7 @@ class KeyUpComponent {
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this.values += event.target.value + ' | ';
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}
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}
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// #enddocregion key-up-component
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// #docregion key-up2-component
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@Component({
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selector: 'key-up2',
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template: `
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@ -146,10 +140,7 @@ class KeyUpComponentV2 {
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this.values += value + ' | ';
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}
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}
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// #enddocregion key-up2-component
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// #docregion key-up3-component
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@Component({
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selector: 'key-up3',
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template: `
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@ -161,10 +152,7 @@ class KeyUpComponentV2 {
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class KeyUpComponentV3 {
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values='';
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}
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// #enddocregion key-up3-component
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// #docregion little-tour-of-heroes-app
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// #docregion little-tour-of-heroes-component
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@Component({
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selector: 'little-tour',
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template: `
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@ -185,10 +173,8 @@ class LittleTour {
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}
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}
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}
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// #enddocregion little-tour-of-heroes-component
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bootstrap(LittleTour);
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// #enddocregion little-tour-of-heroes-app
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@Component({
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selector: 'my-app',
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@ -0,0 +1 @@
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src/**/*.js
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@ -0,0 +1,21 @@
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{
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"name": "angular2-template-syntax",
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"version": "1.0.0",
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"description": "",
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"main": "index.js",
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"scripts": {
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"tsc": "tsc -p src -w",
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"start": "live-server --open=src"
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},
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"keywords": [],
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"author": "",
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"license": "ISC",
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"dependencies": {
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"angular2": "2.0.0-alpha.44",
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"systemjs": "0.19.2"
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},
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"devDependencies": {
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"live-server": "^0.8.1",
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"typescript": "^1.6.2"
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}
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}
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@ -0,0 +1,14 @@
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<!-- #docregion click-me-button -->
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<button (click)="onClickMe()">Click me!</button>
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<!-- #enddocregion click-me-button -->
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<h4>keyup loop-back component</h4>
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<loop-back></loop-back>
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<key-up></key-up>
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<key-up2></key-up2>
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<key-up3></key-up3>
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<key-up4></key-up4>
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@ -0,0 +1,147 @@
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// #docplaster
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// imports formatted for dev guide only
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// #docregion little-tour-of-heroes-app
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import {bootstrap, Component, CORE_DIRECTIVES} from 'angular2/angular2';
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// #enddocregion little-tour-of-heroes-app
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// #docregion click-me-component
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@Component({
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selector: 'click-me',
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template: '<button (click)="onClickMe()">Click me</button>'
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})
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class ClickMeComponent {
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onClickMe(){
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alert('You are my hero!')
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}
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}
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// #enddocregion click-me-component
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// #docregion loop-back-component
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@Component({
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selector: 'loop-back',
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template: '<input #box (keyup)="0"> <p>{{box.value}}</p>'
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})
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class LoopbackComponent {
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}
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// #enddocregion loop-back-component
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// #docregion key-up-component
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@Component({
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selector: 'key-up',
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template: `
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<h4>Give me some keys!</h4>
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<div><input (keyup)="onKey($event)"><div>
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<div>{{values}}</div>
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`
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})
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class KeyUpComponent {
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values='';
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onKey(event) {
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this.values += event.target.value + ' | ';
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}
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}
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// #enddocregion key-up-component
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// #docregion key-up2-component
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@Component({
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selector: 'key-up2',
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template: `
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<h4>Give me some more keys!</h4>
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<div><input #box (keyup)="onKey(box.value)"><div>
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<div>{{values}}</div>
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`
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})
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class KeyUpComponentV2 {
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values='';
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onKey(value) {
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this.values += value + ' | ';
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}
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}
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// #enddocregion key-up2-component
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// #docregion key-up3-component
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@Component({
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selector: 'key-up3',
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template: `
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<h4>Type away! Press [enter] when done.</h4>
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<div><input #box (keyup.enter)="values=box.value"><div>
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<div>{{values}}</div>
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`
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})
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class KeyUpComponentV3 {
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values='';
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}
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// #enddocregion key-up3-component
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// #docregion key-up4-component
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@Component({
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selector: 'key-up4',
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template: `
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<h4>Type away! Press [enter] or mouse away when done.</h4>
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<div>
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<input #box
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(keyup.enter)="values=box.value"
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(blur)="values=box.value">
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<div>
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<div>{{values}}</div>
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`
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})
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class KeyUpComponentV4 {
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values='';
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}
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// #enddocregion key-up4-component
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@Component({
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selector: 'my-app',
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templateUrl: 'app/app.html',
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directives: [
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CORE_DIRECTIVES,
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ClickMeComponent,
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KeyUpComponent, KeyUpComponentV2, KeyUpComponentV3, KeyUpComponentV4,
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LoopbackComponent,
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]
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})
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class AppComponent {
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onClickMe(event){
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let evtMsg = event ? ' Event target class is '+ event.target.className : '';
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alert('Click me.'+evtMsg)
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}
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}
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bootstrap(AppComponent);
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///////////////////////////////////////////////////
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// #docregion little-tour-of-heroes-app
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@Component({
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selector: 'little-tour',
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template: `
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<h4>Little Tour of Heroes</h4>
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<input #new-hero
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(keyup.enter)="addHero(newHero)"
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(blur)="addHero(newHero)">
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<button (click)=addHero(newHero)>Add</button>
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<ul><li *ng-for="#hero of heroes">{{hero}}</li></ul>
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`,
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directives: [CORE_DIRECTIVES]
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})
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class LittleTour {
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heroes=['Windstorm', 'Bombasto', 'Magneta', 'Tornado'];
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addHero(newHero) {
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if (newHero.value) {
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this.heroes.push(newHero.value);
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newHero.value = null; // clear the newHero textbox
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}
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}
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}
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bootstrap(LittleTour);
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// #enddocregion little-tour-of-heroes-app
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@ -0,0 +1,22 @@
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<!DOCTYPE html>
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<html>
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<head>
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<title>User Input</title>
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<link rel="stylesheet" href="styles.css">
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<script src="../node_modules/systemjs/dist/system.src.js"></script>
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<script src="../node_modules/angular2/bundles/angular2.dev.js"></script>
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<script>
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System.config({
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packages: {'app': {defaultExtension: 'js'}}
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});
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System.import('app/app');
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</script>
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</head>
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<body>
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<my-app>Loading...</my-app>
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<hr>
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<little-tour>Loading...</little-tour>
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</body>
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</html>
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@ -0,0 +1,9 @@
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fieldset {border-style:none}
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img {height: 100px;}
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.box {border: 1px solid black; padding:3px}
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.child-div {margin-left: 1em; font-weight: normal}
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.hidden {display: none}
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.parent-div {margin-top: 1em; font-weight: bold}
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.special {font-weight:bold;}
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.toe {margin-left: 1em; font-style: italic;}
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little-hero {color:blue; font-size: smaller; background-color: Turquoise }
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{
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"compilerOptions": {
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"target": "ES5",
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"module": "commonjs",
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"sourceMap": true,
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"emitDecoratorMetadata": true,
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"experimentalDecorators": true,
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"removeComments": false,
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"noImplicitAny": false
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}
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}
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@ -13,7 +13,7 @@ include ../../../../_includes/_util-fns
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The syntax is simple. We assign a template expression to the DOM event name, surrounded in parentheses.
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A click Event Binding makes for a quick illustration.
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+makeExample('template-syntax/ts/src/app/app.html', 'click-me-button')(format=".")
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+makeExample('user-input/ts/src/app/app.html', 'click-me-button')(format=".")
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:markdown
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The `(click)` to the left of the equal sign identifies the button's click event as the **target of the binding**.
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<!--
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These sample can be found in http://plnkr.co/edit/mr63T5
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-->
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+makeExample('template-syntax/ts/src/app/app.ts', 'click-me-component')
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+makeExample('user-input/ts/src/app/app.ts', 'click-me-component')
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:markdown
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The `onClickMe` in the template refers to the `onClickMe` method of the component.
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When the user clicks the button, Angular calls the component's `onClickMe` method.
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what the user types back onto the screen.
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This time we'll both listen to an event and grab the user's input.
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+makeExample('template-syntax/ts/src/app/app.ts', 'key-up-component')
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+makeExample('user-input/ts/src/app/app.ts', 'key-up-component')
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:markdown
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Angular makes an event object available in the **`$event`** variable. The user data we want is in that variable somewhere.
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@ -72,7 +72,7 @@ code-example().
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Let's demonstrate with a clever keystroke loopback in a single line of template HTML.
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We don't actually need a dedicated component to do this but we'll make one anyway.
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+makeExample('template-syntax/ts/src/app/app.ts', 'loop-back-component')
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+makeExample('user-input/ts/src/app/app.ts', 'loop-back-component')
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:markdown
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We've declared a template local variable named `box` on the `<input>` element.
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The `box` variable is a reference to the `<input>` element itself which means we can
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That local template variable is intriguing. It's clearly easer to get to the textbox with that
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variable than to go through the `$event` object. Maybe we can re-write our previous
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"key-up" example using the variable to acquire the user's' input. Let's give it a try.
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+makeExample('template-syntax/ts/src/app/app.ts', 'key-up2-component')
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+makeExample('user-input/ts/src/app/app.ts', 'key-up2-component')
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:markdown
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That sure seems easier.
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An especially nice aspect of this approach is that our component code gets clean data values from the view.
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@ -112,12 +112,20 @@ code-example().
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Only then do we update the component's `values` property ...
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inside the event expression rather than in the component ...
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because we can ... even if it is a dubious practice.
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+makeExample('template-syntax/ts/src/app/app.ts', 'key-up3-component')
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.alert.is-helpful
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:markdown
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We won't transfer the current state of the input box if the user mouses away or clicks
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elsewhere on the page. We only update the component's `values` property when the user presses "Enter"
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inside the input box.
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+makeExample('user-input/ts/src/app/app.ts', 'key-up3-component')
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.l-main-section
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:markdown
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## On blur
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Our previous example won't transfer the current state of the input box if the user mouses away and clicks
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elsewhere on the page. We only update the component's `values` property when the user presses "Enter"
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inside the input box.
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Let's fix that by listening to the input box's blur event as well.
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+makeExample('user-input/ts/src/app/app.ts', 'key-up4-component')
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.l-main-section
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:markdown
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## Put it all together
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@ -125,7 +133,9 @@ code-example().
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We've acquired a small arsenal of event binding techniques in this chapter.
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Let's put it all together in a micro-app
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that can display a list of heroes and add new heroes to that list.
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that can display a list of heroes and add new heroes to that list
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by typing in the input box and hitting "Enter", clicking "Add", or clicking
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elsewhere on the page.
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figure.image-display
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img(src='/resources/images/devguide/user-input/little-tour.png' alt="Little Tour of Heroes")
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@ -135,7 +145,7 @@ figure.image-display
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<!--
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This example in http://plnkr.co/edit/JWeIqq
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-->
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+makeExample('template-syntax/ts/src/app/app.ts', 'little-tour-of-heroes-app')
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+makeExample('user-input/ts/src/app/app.ts', 'little-tour-of-heroes-app')
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:markdown
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We've seen almost everything here before. A few things are new or bear repeating.
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@ -148,11 +158,6 @@ figure.image-display
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The Angular workaround is to spell the declaration in "snake case". Angular translates "#new-hero"
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to `newHero` for template expressions ... which is exactly what we want.
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### **keyup.enter filter**
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We'll add a hero when the user clicks the "Add" button or hits the "Enter" key. We ignore all other keys.
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We accept that we might lose the new hero if the user clicks elsewhere or leaves the page
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without having hit "Enter" or the "Add" button first. Let's hope the users don't complain.
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### **newHero refers to the `<input>` element**
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We can access the `newHero` variable from any sibling or child of the `<input>` element.
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