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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';
import { NgForm } from '@angular/forms';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
public firstExample = 'Hello, World!';
public secondExample = 'Hello, World!';
public ref2 = '';
public desugared1 = `
<input #ref1 type=&quot;text&quot; [(ngModel)]=&quot;firstExample&quot; /><!-- A new template! -->
<ng-template [ngIf]=&quot;true&quot;>
<!-- … and it works -->
<span>Value: {{ ref1.value }}</span>
</ng-template>`
;
public desugared2 = `<ng-template [ngIf]=&quot;true&quot;>
<!-- The reference, ref2, is defined within a template -->
<input #ref2 type=&quot;text&quot; [(ngModel)]=&quot;secondExample&quot; />
</ng-template>
<!-- Attempting to access ref2 from outside the above template doesn't work. -->
<span>Value: {{ ref2?.value }}</span>`;
public ngForExample = `<ng-container *ngFor=&quot;let i of [1,2]&quot;>
<input #ref type=&quot;text&quot; [value]=&quot;i&quot; />
</ng-container>
<!-- The template is instantiated twice because *ngFor iterates
over the two items in the array, so it's impossible to define what ref2 is referencing.-->
{{ ref.value }}`;
@ViewChild('itemForm', { static: false }) form: NgForm;
get submitMessage() { return this._submitMessage; }
private _submitMessage = ''; // tslint:disable-line: variable-name
onSubmit(form: NgForm) {
this._submitMessage = 'Submitted. Form value is ' + JSON.stringify(form.value);
}
callPhone(value: string) {
console.warn(`Calling ${value} ...`);
}
callFax(value: string) {
console.warn(`Faxing ${value} ...`);
}
log(ref3: any) {
console.warn(ref3.constructor);
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/app.module.ts]" value="import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
FormsModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/environments/environment.prod.ts]" value="export const environment = {
production: true
};
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/environments/environment.ts]" value="// This file can be replaced during build by using the `fileReplacements` array.
// `ng build --prod` replaces `environment.ts` with `environment.prod.ts`.
// The list of file replacements can be found in `angular.json`.
export const environment = {
production: false
};
/*
* For easier debugging in development mode, you can import the following file
* to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
*
* This import should be commented out in production mode because it will have a negative impact
* on performance if an error is thrown.
*/
// import 'zone.js/plugins/zone-error'; // Included with Angular CLI.
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/main.ts]" value="import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
if (environment.production) {
enableProdMode();
}
platformBrowserDynamic().bootstrapModule(AppModule);
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/polyfills.ts]" value="/**
* This file includes polyfills needed by Angular and is loaded before the app.
* You can add your own extra polyfills to this file.
*
* This file is divided into 2 sections:
* 1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
* 2. Application imports. Files imported after ZoneJS that should be loaded before your main
* file.
*
* The current setup is for so-called &quot;evergreen&quot; browsers; the last versions of browsers that
* automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
* Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
*
* Learn more in https://angular.io/guide/browser-support
*/
/***************************************************************************************************
* BROWSER POLYFILLS
*/
/** IE11 requires the following for NgClass support on SVG elements */
// import 'classlist.js'; // Run `npm install --save classlist.js`.
/**
* Web Animations `@angular/platform-browser/animations`
* Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
* Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
*/
// import 'web-animations-js'; // Run `npm install --save web-animations-js`.
/**
* By default, zone.js will patch all possible macroTask and DomEvents
* user can disable parts of macroTask/DomEvents patch by setting following flags
* because those flags need to be set before `zone.js` being loaded, and webpack
* will put import in the top of bundle, so user need to create a separate file
* in this directory (for example: zone-flags.ts), and put the following flags
* into that file, and then add the following code before importing zone.js.
* import './zone-flags';
*
* The flags allowed in zone-flags.ts are listed here.
*
* The following flags will work for all browsers.
*
* (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch
* requestAnimationFrame
* (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
* (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch
* specified eventNames
*
* in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
* with the following flag, it will bypass `zone.js` patch for IE/Edge
*
* (window as any).__Zone_enable_cross_context_check = true;
*
*/
/***************************************************************************************************
* Zone JS is required by default for Angular itself.
*/
import 'zone.js'; // Included with Angular CLI.
/***************************************************************************************************
* APPLICATION IMPORTS
*/
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/app.component.css]" value="h3 {
font-weight: 700;
}
pre, .wrapper {
background-color: rgb(240, 250, 250);
padding: 1rem;
border: 1px solid #444;
}
input {
margin: .5rem;
padding: .5rem;
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/styles.css]" value="/* Global Styles */
* {
font-family: Arial, Helvetica, sans-serif;
}
h1 {
color: #264D73;
font-size: 2.5rem;
}
h2, h3 {
color: #444;
font-weight: lighter;
}
h3 {
font-size: 1.3rem;
}
body {
padding: .5rem;
max-width: 1000px;
margin: auto;
}
@media (min-width: 600px) {
body {
padding: 2rem;
}
}
body, input[text] {
color: #333;
font-family: Cambria, Georgia, serif;
}
a {
cursor: pointer;
}
button {
background-color: #eee;
border: none;
border-radius: 4px;
cursor: pointer;
color: black;
font-size: 1.2rem;
padding: 1rem;
margin-right: 1rem;
margin-bottom: 1rem;
}
button:hover {
background-color: black;
color: white;
}
button:disabled {
background-color: #eee;
color: #aaa;
cursor: auto;
}
/* Navigation link styles */
nav a {
padding: 5px 10px;
text-decoration: none;
margin-right: 10px;
margin-top: 10px;
display: inline-block;
background-color: #e8e8e8;
color: #3d3d3d;
border-radius: 4px;
}
nav a:hover {
color: white;
background-color: #42545C;
}
nav a.active {
background-color: black;
color: white;
}
hr {
margin: 1.5rem 0;
}
input[type=&quot;text&quot;] {
box-sizing: border-box;
width: 100%;
padding: .5rem;
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/app.component.html]" value="<h1>Template reference variables</h1>
<div>
<h2>Pass value to an event handler</h2>
<p>See console for output.</p>
<input #phone placeholder=&quot;phone number&quot; />
<!-- lots of other elements -->
<!-- phone refers to the input element; pass its `value` to an event handler -->
<button (click)=&quot;callPhone(phone.value)&quot;>Call</button>
</div>
<div>
<input ref-fax placeholder=&quot;fax number&quot; />
<button (click)=&quot;callFax(fax.value)&quot;>Fax</button>
</div>
<hr />
<div>
<h2>Template reference variable with disabled button</h2>
<p>btn refers to the button element.</p>
<button
#btn
disabled
[innerHTML]=&quot;'disabled by attribute: ' + btn.disabled&quot;
></button>
</div>
<hr />
<h2>Reference variables, forms, and NgForm</h2>
<form #itemForm=&quot;ngForm&quot; (ngSubmit)=&quot;onSubmit(itemForm)&quot;>
<label for=&quot;name&quot;>Name <input class=&quot;form-control&quot; name=&quot;name&quot; ngModel required />
</label>
<button type=&quot;submit&quot;>Submit</button>
</form>
<div [hidden]=&quot;!itemForm.form.valid&quot;>
<p>{{ submitMessage }}</p>
</div>
<p>JSON: {{ itemForm.form.value | json }}</p>
<hr />
<h2>Template Reference Variable Scope</h2>
<p>This section demonstrates in which situations you can access local template reference variables (<code>#ref</code>).</p>
<h3>Accessing in a child template</h3>
<!-- Accessing a template reference variable from an inner template
works as the context is inherited. Try changing the text in the
input to see how it is immediately reflected through the template
reference variable. -->
<div class=&quot;example&quot;>
<input #ref1 type=&quot;text&quot; [(ngModel)]=&quot;firstExample&quot; />
<span *ngIf=&quot;true&quot;>Value: {{ ref1.value }}</span>
</div>
<!-- In this case there's a &quot;hidden&quot; ng-template around the
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). -->
<p>Here's the desugared syntax:</p>
<pre><code [innerText]=&quot;desugared1&quot;></code></pre>
<h3>Accessing from outside parent template. (Doesn't work.)</h3>
<!-- Accessing the template reference variable from outside the parent template does
not work. The value to the right is empty and changing the
value of the input will have no effect. -->
<div class=&quot;example&quot;>
<input *ngIf=&quot;true&quot; #ref2 type=&quot;text&quot; [(ngModel)]=&quot;secondExample&quot; />
<!-- <span>Value: {{ ref2?.value }}</span> -->
<!-- uncomment the above and the app breaks -->
</div>
<p>Here's the desugared syntax:</p>
<pre><code [innerText]=&quot;desugared2&quot;></code></pre>
<h3>*ngFor and template reference variable scope</h3>
<!-- The template is instantiated twice because *ngFor iterates
over the two items in the array, so it's impossible to define what ref2 is referencing. -->
<pre><code [innerText]=&quot;ngForExample&quot;></code></pre>
<h3>Accessing a on an <code>ng-template</code></h3>
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.
<ng-template #ref3></ng-template>
<button (click)=&quot;log(ref3)&quot;>Log type of #ref</button>
<!--
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
-->"><input type="hidden" name="files[src/index.html]" value="<!doctype html>
<html>
<head>
<meta charset=&quot;utf-8&quot;>
<title>Template Reference Variables Example</title>
<base href=&quot;/&quot;>
<meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1&quot;>
<link rel=&quot;icon&quot; type=&quot;image/x-icon&quot; href=&quot;favicon.ico&quot;>
</head>
<body>
<app-root>Loading...</app-root>
</body>
</html>
<!--
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
-->"><input type="hidden" name="files[angular.json]" value="{
&quot;$schema&quot;: &quot;./node_modules/@angular/cli/lib/config/schema.json&quot;,
&quot;version&quot;: 1,
&quot;newProjectRoot&quot;: &quot;projects&quot;,
&quot;projects&quot;: {
&quot;angular.io-example&quot;: {
&quot;projectType&quot;: &quot;application&quot;,
&quot;schematics&quot;: {
&quot;@schematics/angular:application&quot;: {
&quot;strict&quot;: true
}
},
&quot;root&quot;: &quot;&quot;,
&quot;sourceRoot&quot;: &quot;src&quot;,
&quot;prefix&quot;: &quot;app&quot;,
&quot;architect&quot;: {
&quot;build&quot;: {
&quot;builder&quot;: &quot;@angular-devkit/build-angular:browser&quot;,
&quot;options&quot;: {
&quot;outputPath&quot;: &quot;dist&quot;,
&quot;index&quot;: &quot;src/index.html&quot;,
&quot;main&quot;: &quot;src/main.ts&quot;,
&quot;polyfills&quot;: &quot;src/polyfills.ts&quot;,
&quot;tsConfig&quot;: &quot;tsconfig.app.json&quot;,
&quot;aot&quot;: true,
&quot;assets&quot;: [
&quot;src/favicon.ico&quot;,
&quot;src/assets&quot;
],
&quot;styles&quot;: [
&quot;src/styles.css&quot;
],
&quot;scripts&quot;: []
},
&quot;configurations&quot;: {
&quot;production&quot;: {
&quot;fileReplacements&quot;: [
{
&quot;replace&quot;: &quot;src/environments/environment.ts&quot;,
&quot;with&quot;: &quot;src/environments/environment.prod.ts&quot;
}
],
&quot;optimization&quot;: true,
&quot;outputHashing&quot;: &quot;all&quot;,
&quot;sourceMap&quot;: false,
&quot;namedChunks&quot;: false,
&quot;extractLicenses&quot;: true,
&quot;vendorChunk&quot;: false,
&quot;buildOptimizer&quot;: true,
&quot;budgets&quot;: [
{
&quot;type&quot;: &quot;initial&quot;,
&quot;maximumWarning&quot;: &quot;500kb&quot;,
&quot;maximumError&quot;: &quot;1mb&quot;
},
{
&quot;type&quot;: &quot;anyComponentStyle&quot;,
&quot;maximumWarning&quot;: &quot;2kb&quot;,
&quot;maximumError&quot;: &quot;4kb&quot;
}
]
}
}
},
&quot;serve&quot;: {
&quot;builder&quot;: &quot;@angular-devkit/build-angular:dev-server&quot;,
&quot;options&quot;: {
&quot;browserTarget&quot;: &quot;angular.io-example:build&quot;
},
&quot;configurations&quot;: {
&quot;production&quot;: {
&quot;browserTarget&quot;: &quot;angular.io-example:build:production&quot;
}
}
},
&quot;extract-i18n&quot;: {
&quot;builder&quot;: &quot;@angular-devkit/build-angular:extract-i18n&quot;,
&quot;options&quot;: {
&quot;browserTarget&quot;: &quot;angular.io-example:build&quot;
}
},
&quot;test&quot;: {
&quot;builder&quot;: &quot;@angular-devkit/build-angular:karma&quot;,
&quot;options&quot;: {
&quot;main&quot;: &quot;src/test.ts&quot;,
&quot;polyfills&quot;: &quot;src/polyfills.ts&quot;,
&quot;tsConfig&quot;: &quot;tsconfig.spec.json&quot;,
&quot;karmaConfig&quot;: &quot;karma.conf.js&quot;,
&quot;assets&quot;: [
&quot;src/favicon.ico&quot;,
&quot;src/assets&quot;
],
&quot;styles&quot;: [
&quot;src/styles.css&quot;
],
&quot;scripts&quot;: []
}
},
&quot;lint&quot;: {
&quot;builder&quot;: &quot;@angular-devkit/build-angular:tslint&quot;,
&quot;options&quot;: {
&quot;tsConfig&quot;: [
&quot;tsconfig.app.json&quot;,
&quot;tsconfig.spec.json&quot;,
&quot;e2e/tsconfig.json&quot;
],
&quot;exclude&quot;: [
&quot;**/node_modules/**&quot;
]
}
},
&quot;e2e&quot;: {
&quot;builder&quot;: &quot;@angular-devkit/build-angular:protractor&quot;,
&quot;options&quot;: {
&quot;protractorConfig&quot;: &quot;e2e/protractor.conf.js&quot;,
&quot;devServerTarget&quot;: &quot;angular.io-example:serve&quot;
},
&quot;configurations&quot;: {
&quot;production&quot;: {
&quot;devServerTarget&quot;: &quot;angular.io-example:serve:production&quot;
}
}
}
}
}
},
&quot;defaultProject&quot;: &quot;angular.io-example&quot;
}
"><input type="hidden" name="files[tsconfig.json]" value="{
&quot;compileOnSave&quot;: false,
&quot;compilerOptions&quot;: {
&quot;baseUrl&quot;: &quot;./&quot;,
&quot;outDir&quot;: &quot;./dist/out-tsc&quot;,
&quot;forceConsistentCasingInFileNames&quot;: true,
&quot;noImplicitReturns&quot;: true,
&quot;noFallthroughCasesInSwitch&quot;: true,
&quot;sourceMap&quot;: true,
&quot;declaration&quot;: false,
&quot;downlevelIteration&quot;: true,
&quot;experimentalDecorators&quot;: true,
&quot;moduleResolution&quot;: &quot;node&quot;,
&quot;importHelpers&quot;: true,
&quot;target&quot;: &quot;es2015&quot;,
&quot;module&quot;: &quot;es2020&quot;,
&quot;lib&quot;: [
&quot;es2018&quot;,
&quot;dom&quot;
]
},
&quot;angularCompilerOptions&quot;: {
&quot;strictInjectionParameters&quot;: true,
&quot;strictInputAccessModifiers&quot;: true,
&quot;strictTemplates&quot;: true,
&quot;enableIvy&quot;: true
}
}"><input type="hidden" name="tags[0]" value="angular"><input type="hidden" name="tags[1]" value="example"><input type="hidden" name="tags[2]" value="Template Reference Variables"><input type="hidden" name="description" value="Angular Example - Template Reference Variables"><input type="hidden" name="dependencies" value="{&quot;@angular/animations&quot;:&quot;~11.0.1&quot;,&quot;@angular/common&quot;:&quot;~11.0.1&quot;,&quot;@angular/compiler&quot;:&quot;~11.0.1&quot;,&quot;@angular/core&quot;:&quot;~11.0.1&quot;,&quot;@angular/forms&quot;:&quot;~11.0.1&quot;,&quot;@angular/platform-browser&quot;:&quot;~11.0.1&quot;,&quot;@angular/platform-browser-dynamic&quot;:&quot;~11.0.1&quot;,&quot;@angular/router&quot;:&quot;~11.0.1&quot;,&quot;angular-in-memory-web-api&quot;:&quot;~0.11.0&quot;,&quot;rxjs&quot;:&quot;~6.6.0&quot;,&quot;tslib&quot;:&quot;^2.0.0&quot;,&quot;zone.js&quot;:&quot;~0.11.4&quot;,&quot;jasmine-core&quot;:&quot;~3.6.0&quot;,&quot;jasmine-marbles&quot;:&quot;~0.6.0&quot;}"></form>
<script>
var embedded = 'ctl=1';
var isEmbedded = window.location.search.indexOf(embedded) > -1;
if (isEmbedded) {
var form = document.getElementById('mainForm');
var action = form.action;
var actionHasParams = action.indexOf('?') > -1;
var symbol = actionHasParams ? '&' : '?'
form.action = form.action + symbol + embedded;
}
document.getElementById("mainForm").submit();
</script>
</body></html>