614 lines
21 KiB
HTML
614 lines
21 KiB
HTML
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<html lang="en"><head></head><body>
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<form id="mainForm" method="post" action="https://run.stackblitz.com/api/angular/v1?file=src/app/app.component.ts" target="_self"><input type="hidden" name="files[src/app/app.component.ts]" value="import { Component, ViewChild } from '@angular/core';
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import { NgForm } from '@angular/forms';
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@Component({
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selector: 'app-root',
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templateUrl: './app.component.html',
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styleUrls: ['./app.component.css']
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})
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export class AppComponent {
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public firstExample = 'Hello, World!';
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public secondExample = 'Hello, World!';
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public ref2 = '';
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public desugared1 = `
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<input #ref1 type="text" [(ngModel)]="firstExample" /><!-- A new template! -->
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<ng-template [ngIf]="true">
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<!-- … and it works -->
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<span>Value: {{ ref1.value }}</span>
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</ng-template>`
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;
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public desugared2 = `<ng-template [ngIf]="true">
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<!-- The reference, ref2, is defined within a template -->
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<input #ref2 type="text" [(ngModel)]="secondExample" />
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</ng-template>
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<!-- Attempting to access ref2 from outside the above template doesn't work. -->
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<span>Value: {{ ref2?.value }}</span>`;
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public ngForExample = `<ng-container *ngFor="let i of [1,2]">
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<input #ref type="text" [value]="i" />
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</ng-container>
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<!-- The template is instantiated twice because *ngFor iterates
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over the two items in the array, so it's impossible to define what ref2 is referencing.-->
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{{ ref.value }}`;
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@ViewChild('itemForm', { static: false }) form: NgForm;
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get submitMessage() { return this._submitMessage; }
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private _submitMessage = ''; // tslint:disable-line: variable-name
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onSubmit(form: NgForm) {
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this._submitMessage = 'Submitted. Form value is ' + JSON.stringify(form.value);
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}
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callPhone(value: string) {
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console.warn(`Calling ${value} ...`);
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}
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callFax(value: string) {
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console.warn(`Faxing ${value} ...`);
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}
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log(ref3: any) {
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console.warn(ref3.constructor);
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}
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}
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/app/app.module.ts]" value="import { BrowserModule } from '@angular/platform-browser';
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import { NgModule } from '@angular/core';
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import { FormsModule } from '@angular/forms';
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import { AppComponent } from './app.component';
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@NgModule({
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declarations: [
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AppComponent
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],
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imports: [
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BrowserModule,
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FormsModule
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],
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providers: [],
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bootstrap: [AppComponent]
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})
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export class AppModule { }
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/environments/environment.prod.ts]" value="export const environment = {
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production: true
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};
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/environments/environment.ts]" value="// This file can be replaced during build by using the `fileReplacements` array.
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// `ng build --prod` replaces `environment.ts` with `environment.prod.ts`.
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// The list of file replacements can be found in `angular.json`.
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export const environment = {
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production: false
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};
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/*
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* For easier debugging in development mode, you can import the following file
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* to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
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*
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* This import should be commented out in production mode because it will have a negative impact
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* on performance if an error is thrown.
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*/
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// import 'zone.js/plugins/zone-error'; // Included with Angular CLI.
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/main.ts]" value="import { enableProdMode } from '@angular/core';
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import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
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import { AppModule } from './app/app.module';
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import { environment } from './environments/environment';
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if (environment.production) {
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enableProdMode();
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}
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platformBrowserDynamic().bootstrapModule(AppModule);
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/polyfills.ts]" value="/**
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* This file includes polyfills needed by Angular and is loaded before the app.
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* You can add your own extra polyfills to this file.
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*
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* This file is divided into 2 sections:
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* 1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
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* 2. Application imports. Files imported after ZoneJS that should be loaded before your main
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* file.
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*
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* The current setup is for so-called "evergreen" browsers; the last versions of browsers that
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* automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
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* Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
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*
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* Learn more in https://angular.io/guide/browser-support
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*/
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/***************************************************************************************************
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* BROWSER POLYFILLS
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*/
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/** IE11 requires the following for NgClass support on SVG elements */
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// import 'classlist.js'; // Run `npm install --save classlist.js`.
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/**
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* Web Animations `@angular/platform-browser/animations`
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* Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
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* Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
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*/
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// import 'web-animations-js'; // Run `npm install --save web-animations-js`.
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/**
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* By default, zone.js will patch all possible macroTask and DomEvents
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* user can disable parts of macroTask/DomEvents patch by setting following flags
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* because those flags need to be set before `zone.js` being loaded, and webpack
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* will put import in the top of bundle, so user need to create a separate file
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* in this directory (for example: zone-flags.ts), and put the following flags
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* into that file, and then add the following code before importing zone.js.
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* import './zone-flags';
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*
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* The flags allowed in zone-flags.ts are listed here.
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*
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* The following flags will work for all browsers.
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*
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* (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch
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* requestAnimationFrame
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* (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
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* (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch
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* specified eventNames
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*
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* in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
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* with the following flag, it will bypass `zone.js` patch for IE/Edge
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*
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* (window as any).__Zone_enable_cross_context_check = true;
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*
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*/
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/***************************************************************************************************
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* Zone JS is required by default for Angular itself.
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*/
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import 'zone.js'; // Included with Angular CLI.
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/***************************************************************************************************
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* APPLICATION IMPORTS
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*/
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/app/app.component.css]" value="h3 {
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font-weight: 700;
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}
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pre, .wrapper {
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background-color: rgb(240, 250, 250);
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padding: 1rem;
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border: 1px solid #444;
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}
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input {
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margin: .5rem;
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padding: .5rem;
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}
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/styles.css]" value="/* Global Styles */
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* {
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font-family: Arial, Helvetica, sans-serif;
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}
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h1 {
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color: #264D73;
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font-size: 2.5rem;
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}
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h2, h3 {
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color: #444;
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font-weight: lighter;
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}
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h3 {
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font-size: 1.3rem;
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}
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body {
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padding: .5rem;
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max-width: 1000px;
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margin: auto;
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}
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@media (min-width: 600px) {
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body {
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padding: 2rem;
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}
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}
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body, input[text] {
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color: #333;
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font-family: Cambria, Georgia, serif;
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}
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a {
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cursor: pointer;
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}
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button {
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background-color: #eee;
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border: none;
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border-radius: 4px;
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cursor: pointer;
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color: black;
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font-size: 1.2rem;
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padding: 1rem;
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margin-right: 1rem;
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margin-bottom: 1rem;
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}
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button:hover {
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background-color: black;
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color: white;
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}
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button:disabled {
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background-color: #eee;
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color: #aaa;
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cursor: auto;
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}
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/* Navigation link styles */
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nav a {
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padding: 5px 10px;
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text-decoration: none;
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margin-right: 10px;
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margin-top: 10px;
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display: inline-block;
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background-color: #e8e8e8;
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color: #3d3d3d;
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border-radius: 4px;
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}
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nav a:hover {
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color: white;
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background-color: #42545C;
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}
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nav a.active {
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background-color: black;
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color: white;
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}
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hr {
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margin: 1.5rem 0;
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}
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input[type="text"] {
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box-sizing: border-box;
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width: 100%;
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padding: .5rem;
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}
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/*
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Copyright Google LLC. All Rights Reserved.
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Use of this source code is governed by an MIT-style license that
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can be found in the LICENSE file at https://angular.io/license
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*/"><input type="hidden" name="files[src/app/app.component.html]" value="<h1>Template reference variables</h1>
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<div>
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<h2>Pass value to an event handler</h2>
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<p>See console for output.</p>
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<input #phone placeholder="phone number" />
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<!-- lots of other elements -->
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<!-- phone refers to the input element; pass its `value` to an event handler -->
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<button (click)="callPhone(phone.value)">Call</button>
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</div>
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<div>
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<input ref-fax placeholder="fax number" />
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<button (click)="callFax(fax.value)">Fax</button>
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</div>
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<hr />
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<div>
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<h2>Template reference variable with disabled button</h2>
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<p>btn refers to the button element.</p>
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<button
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#btn
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disabled
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[innerHTML]="'disabled by attribute: ' + btn.disabled"
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></button>
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</div>
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<hr />
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<h2>Reference variables, forms, and NgForm</h2>
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<form #itemForm="ngForm" (ngSubmit)="onSubmit(itemForm)">
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<label for="name">Name <input class="form-control" name="name" ngModel required />
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</label>
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<button type="submit">Submit</button>
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</form>
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<div [hidden]="!itemForm.form.valid">
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<p>{{ submitMessage }}</p>
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</div>
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<p>JSON: {{ itemForm.form.value | json }}</p>
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<hr />
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<h2>Template Reference Variable Scope</h2>
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<p>This section demonstrates in which situations you can access local template reference variables (<code>#ref</code>).</p>
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<h3>Accessing in a child template</h3>
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<!-- Accessing a template reference variable from an inner template
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works as the context is inherited. Try changing the text in the
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input to see how it is immediately reflected through the template
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reference variable. -->
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<div class="example">
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<input #ref1 type="text" [(ngModel)]="firstExample" />
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<span *ngIf="true">Value: {{ ref1.value }}</span>
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</div>
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<!-- In this case there's a "hidden" ng-template around the
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span and the definition of the variable is outside of it. Thus, you access a template variable from a parent template (which is logical as the context is inherited). -->
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<p>Here's the desugared syntax:</p>
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<pre><code [innerText]="desugared1"></code></pre>
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<h3>Accessing from outside parent template. (Doesn't work.)</h3>
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<!-- Accessing the template reference variable from outside the parent template does
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not work. The value to the right is empty and changing the
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value of the input will have no effect. -->
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<div class="example">
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<input *ngIf="true" #ref2 type="text" [(ngModel)]="secondExample" />
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<!-- <span>Value: {{ ref2?.value }}</span> -->
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<!-- uncomment the above and the app breaks -->
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</div>
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<p>Here's the desugared syntax:</p>
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<pre><code [innerText]="desugared2"></code></pre>
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<h3>*ngFor and template reference variable scope</h3>
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<!-- The template is instantiated twice because *ngFor iterates
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over the two items in the array, so it's impossible to define what ref2 is referencing. -->
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<pre><code [innerText]="ngForExample"></code></pre>
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<h3>Accessing a on an <code>ng-template</code></h3>
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See the console output to see that when you declare the variable on an <code>ng-template</code>, the variable refers to a <code>TemplateRef</code> instance, which represents the template.
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<ng-template #ref3></ng-template>
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<button (click)="log(ref3)">Log type of #ref</button>
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<!--
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Copyright Google LLC. All Rights Reserved.
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||
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Use of this source code is governed by an MIT-style license that
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||
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can be found in the LICENSE file at https://angular.io/license
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||
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-->"><input type="hidden" name="files[src/index.html]" value="<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Template Reference Variables Example</title>
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<base href="/">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="icon" type="image/x-icon" href="favicon.ico">
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</head>
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<body>
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<app-root>Loading...</app-root>
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</body>
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</html>
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<!--
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||
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Copyright Google LLC. All Rights Reserved.
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||
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Use of this source code is governed by an MIT-style license that
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||
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can be found in the LICENSE file at https://angular.io/license
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||
|
-->"><input type="hidden" name="files[angular.json]" value="{
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