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<pre><code class="lang-html"><span class="hljs-comment">&lt;!-- hero-from.component.html --&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;container&quot;</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">div</span> [<span class="hljs-attr">hidden</span>]=<span class="hljs-string">&quot;submitted&quot;</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">h4</span>&gt;</span>Hero Form<span class="hljs-tag">&lt;/<span class="hljs-name">h4</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">form</span> (<span class="hljs-attr">ngSubmit</span>)=<span class="hljs-string">&quot;onSubmit()&quot;</span> #<span class="hljs-attr">heroForm</span>=<span class="hljs-string">&quot;ngForm&quot;</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;form-group&quot;</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">label</span> <span class="hljs-attr">for</span>=<span class="hljs-string">&quot;name&quot;</span>&gt;</span>Name<span class="hljs-tag">&lt;/<span class="hljs-name">label</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">input</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;text&quot;</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;form-control&quot;</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;name&quot;</span>
               <span class="hljs-attr">required</span>
               [(<span class="hljs-attr">ngModel</span>)]=<span class="hljs-string">&quot;model.name&quot;</span> <span class="hljs-attr">name</span>=<span class="hljs-string">&quot;name&quot;</span>
               #<span class="hljs-attr">name</span>=<span class="hljs-string">&quot;ngModel&quot;</span>&gt;</span>
        <span class="hljs-comment">&lt;!--&#x5224;&#x8BFB;&#x7528;&#x6237;&#x662F;&#x5426;&#x8F93;&#x5165;&#x4E86;&#x8868;&#x5355;&#x5185;&#x5BB9;--&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">div</span> [<span class="hljs-attr">hidden</span>]=<span class="hljs-string">&quot;name.valid || name.pristine&quot;</span>
             <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;alert alert-danger&quot;</span>&gt;</span>
          Name is required
        <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
      <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>

      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;form-group&quot;</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">label</span> <span class="hljs-attr">for</span>=<span class="hljs-string">&quot;alterEgo&quot;</span>&gt;</span>Alter Ego<span class="hljs-tag">&lt;/<span class="hljs-name">label</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">input</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;text&quot;</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;form-control&quot;</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;alterEgo&quot;</span>
               [(<span class="hljs-attr">ngModel</span>)]=<span class="hljs-string">&quot;model.alterEgo&quot;</span> <span class="hljs-attr">name</span>=<span class="hljs-string">&quot;alterEgo&quot;</span>&gt;</span>
      <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>

      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;form-group&quot;</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">label</span> <span class="hljs-attr">for</span>=<span class="hljs-string">&quot;power&quot;</span>&gt;</span>Hero Power<span class="hljs-tag">&lt;/<span class="hljs-name">label</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">select</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;form-control&quot;</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;power&quot;</span>
                <span class="hljs-attr">required</span>
                [(<span class="hljs-attr">ngModel</span>)]=<span class="hljs-string">&quot;model.power&quot;</span> <span class="hljs-attr">name</span>=<span class="hljs-string">&quot;power&quot;</span>
                #<span class="hljs-attr">power</span>=<span class="hljs-string">&quot;ngModel&quot;</span>&gt;</span>
          <span class="hljs-tag">&lt;<span class="hljs-name">option</span> *<span class="hljs-attr">ngFor</span>=<span class="hljs-string">&quot;let pow of powers&quot;</span> [<span class="hljs-attr">value</span>]=<span class="hljs-string">&quot;pow&quot;</span>&gt;</span>{{pow}}<span class="hljs-tag">&lt;/<span class="hljs-name">option</span>&gt;</span>
        <span class="hljs-tag">&lt;/<span class="hljs-name">select</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">div</span> [<span class="hljs-attr">hidden</span>]=<span class="hljs-string">&quot;power.valid || power.pristine&quot;</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;alert alert-danger&quot;</span>&gt;</span>
          Power is required
        <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
      <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>

      <span class="hljs-tag">&lt;<span class="hljs-name">button</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;submit&quot;</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;btn btn-success&quot;</span> [<span class="hljs-attr">disabled</span>]=<span class="hljs-string">&quot;!heroForm.form.valid&quot;</span>&gt;</span>Submit<span class="hljs-tag">&lt;/<span class="hljs-name">button</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">button</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;button&quot;</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;btn btn-default&quot;</span> (<span class="hljs-attr">click</span>)=<span class="hljs-string">&quot;newHero(); heroForm.reset()&quot;</span>&gt;</span>New Hero<span class="hljs-tag">&lt;/<span class="hljs-name">button</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">form</span>&gt;</span>
  <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>

  <span class="hljs-tag">&lt;<span class="hljs-name">div</span> [<span class="hljs-attr">hidden</span>]=<span class="hljs-string">&quot;!submitted&quot;</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">h2</span>&gt;</span>You submitted the following:<span class="hljs-tag">&lt;/<span class="hljs-name">h2</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;row&quot;</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;col-xs-3&quot;</span>&gt;</span>Name<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;col-xs-9  pull-left&quot;</span>&gt;</span>{{ model.name }}<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;row&quot;</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;col-xs-3&quot;</span>&gt;</span>Alter Ego<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;col-xs-9 pull-left&quot;</span>&gt;</span>{{ model.alterEgo }}<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;row&quot;</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;col-xs-3&quot;</span>&gt;</span>Power<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;col-xs-9 pull-left&quot;</span>&gt;</span>{{ model.power }}<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">br</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">button</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;btn btn-primary&quot;</span> (<span class="hljs-attr">click</span>)=<span class="hljs-string">&quot;submitted=false&quot;</span>&gt;</span>Edit<span class="hljs-tag">&lt;/<span class="hljs-name">button</span>&gt;</span>
  <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
</code></pre>
<pre><code class="lang-css"><span class="hljs-comment">/*hero-from.component.css*/</span>
<span class="hljs-selector-class">.ng-valid</span><span class="hljs-selector-attr">[required]</span>, <span class="hljs-selector-class">.ng-valid</span><span class="hljs-selector-class">.required</span>  {
  <span class="hljs-attribute">border-left</span>: <span class="hljs-number">5px</span> solid <span class="hljs-number">#42A948</span>; <span class="hljs-comment">/* green */</span>
}

<span class="hljs-selector-class">.ng-invalid</span><span class="hljs-selector-pseudo">:not(form)</span>  {
  <span class="hljs-attribute">border-left</span>: <span class="hljs-number">5px</span> solid <span class="hljs-number">#a94442</span>; <span class="hljs-comment">/* red */</span>
}
</code></pre>
<pre><code class="lang-typescript"><span class="hljs-comment">// app.module.ts</span>
<span class="hljs-keyword">import</span> { BrowserModule } from <span class="hljs-string">&apos;@angular/platform-browser&apos;</span>;
<span class="hljs-keyword">import</span> { NgModule } from <span class="hljs-string">&apos;@angular/core&apos;</span>;
<span class="hljs-keyword">import</span> { FormsModule }   from <span class="hljs-string">&apos;@angular/forms&apos;</span>;

<span class="hljs-keyword">import</span> { AppComponent } from <span class="hljs-string">&apos;./app.component&apos;</span>;
<span class="hljs-keyword">import</span> { HeroFromComponent } from <span class="hljs-string">&apos;./hero-from/hero-from.component&apos;</span>;

@NgModule({
  declarations: [
    AppComponent,
    HeroFromComponent
  ],
  imports: [
    BrowserModule,
    FormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
<span class="hljs-keyword">export</span> <span class="hljs-keyword">class</span> AppModule { }
</code></pre>
<pre><code class="lang-typescript"><span class="hljs-comment">// hero-from.component.ts</span>
<span class="hljs-keyword">import</span> {Component, OnInit} from <span class="hljs-string">&apos;@angular/core&apos;</span>;
<span class="hljs-keyword">import</span> {Hero} from <span class="hljs-string">&apos;./Hero&apos;</span>

@Component({
  selector: <span class="hljs-string">&apos;hero-from&apos;</span>,
  templateUrl: <span class="hljs-string">&apos;./hero-from.component.html&apos;</span>,
  styleUrls: [<span class="hljs-string">&apos;./hero-from.component.css&apos;</span>]
})
<span class="hljs-keyword">export</span> <span class="hljs-keyword">class</span> HeroFromComponent <span class="hljs-keyword">implements</span> OnInit {
  powers = [<span class="hljs-string">&apos;Really Smart&apos;</span>, <span class="hljs-string">&apos;Super Flexible&apos;</span>,
    <span class="hljs-string">&apos;Super Hot&apos;</span>, <span class="hljs-string">&apos;Weather Changer&apos;</span>];
  model = <span class="hljs-keyword">new</span> Hero(<span class="hljs-number">18</span>, <span class="hljs-string">&apos;Dr IQ&apos;</span>, <span class="hljs-keyword">this</span>.powers[<span class="hljs-number">0</span>], <span class="hljs-string">&apos;Chuck Overstreet&apos;</span>);
  submitted = <span class="hljs-literal">false</span>;

  onSubmit() { <span class="hljs-keyword">this</span>.submitted = <span class="hljs-literal">true</span>; }

  <span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> Remove this when we&apos;re done</span>
  <span class="hljs-keyword">get</span> diagnostic() { <span class="hljs-keyword">return</span> <span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-keyword">this</span>.model); }

  ngOnInit() {
  }
}
</code></pre>
<pre><code class="lang-typescript"><span class="hljs-comment">// Hero.ts &#x5B9A;&#x4E49;&#x6570;&#x636E;&#x7C7B;&#x578B;</span>
<span class="hljs-keyword">export</span> <span class="hljs-keyword">class</span> Hero {
  <span class="hljs-keyword">constructor</span>(public id: number,
              public name: string,
              public power: string,
              public alterEgo?: string) {
  }
}
</code></pre>
<h4 id="&#x3000;&#x5B9E;&#x4F8B;&#x89E3;&#x6790;">&#x3000;&#x5B9E;&#x4F8B;&#x89E3;&#x6790;</h4>
<blockquote>
<p>&#x8BE5;&#x4F8B;&#xFF0C;&#x4F7F;&#x7528;ngModel ,&#x7ED1;&#x5B9A;&#x6570;&#x636E;&#xFF0C;&#x5E76;&#x901A;&#x8FC7;&#x3000;<code>valid</code> <code>pristine</code>&#x3000;&#x5224;&#x65AD;input&#x662F;&#x5426;&#x6709;&#x8F93;&#x5165;&#x3002;&#x6700;&#x540E;&#x7528;<code>submitted</code>&#x63A7;&#x5236;&#x8868;&#x5355;&#x6A21;&#x62DF;&#x63D0;&#x4EA4;&#x4E8B;&#x4EF6;</p>
</blockquote>
<p>html&#x4EE3;&#x7801;&#x89E3;&#x6790;:<br>
&#x7ED1;&#x5B9A;ng&#x5185;&#x7F6E;froms&#x6A21;&#x677F;:&#x65B9;&#x6CD5; =&gt; <code>#heroForm=&quot;ngForm&quot;</code><br> 
&#x4E3A;&#x8868;&#x5355;&#x5143;&#x7D20;&#x7ED1;&#x5B9A;ngModule: </p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-name">input</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;text&quot;</span> 
       <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;form-control&quot;</span> 
       <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;name&quot;</span>
       <span class="hljs-attr">name</span>=<span class="hljs-string">&quot;name&quot;</span>
       <span class="hljs-attr">required</span>
       [(<span class="hljs-attr">ngModel</span>)]=<span class="hljs-string">&quot;model.name&quot;</span>
       #<span class="hljs-attr">name</span>=<span class="hljs-string">&quot;ngModel&quot;</span>&gt;</span>
</code></pre>
<p>&#x5C55;&#x793A;ngModel : &#x65B9;&#x6CD5;&#x3000;=&gt; <code>{{ model.name }}</code><br></p>
<p>&#x5224;&#x65AD;&#x8868;&#x5355;&#x5185;&#x5BB9;&#x662F;&#x5426;&#x8F93;&#x5165;</p>
<pre><code class="lang-html"><span class="hljs-comment">&lt;!--&#x5224;&#x8BFB;&#x7528;&#x6237;&#x662F;&#x5426;&#x8F93;&#x5165;&#x4E86;&#x8868;&#x5355;&#x5185;&#x5BB9;--&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">div</span> [<span class="hljs-attr">hidden</span>]=<span class="hljs-string">&quot;name.valid || name.pristine&quot;</span>
     <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;alert alert-danger&quot;</span>&gt;</span>
  Name is required
<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
</code></pre>
<p>&#x63A7;&#x5236;&#x7EC4;&#x4EF6;&#x662F;&#x5426;&#x663E;&#x793A;: &#x65B9;&#x6CD5; =&gt; <code>[hidden]=&quot;!submitted&quot;</code><br> <code>submitted</code>&#x4E3A;&#x53D8;&#x91CF;&#xFF0C;&#x53D7;&#x4E8B;&#x4EF6;&#x9A71;&#x52A8;</p>

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