title: Angular [disabled]="MyBoolean" not working
body: <p>I have some inputs (Checkboxes) and I want them to be disabled if my Booleans are true.
  But its not working... The funny thing is the submit button works just fine and thats the same method...</p>
  <p>myComponent.html</p>
  <pre class="lang-c# prettyprint-override"><code>          &lt;form [formGroup]=&quot;BetreuungsoptionForm&quot; (ngSubmit)=&quot;onSubmit()&quot;&gt;
              &lt;label *ngIf=&quot;!eingetragen&quot; for=&quot;art&quot;&gt;Art&lt;/label&gt;
              &lt;select *ngIf=&quot;!eingetragen&quot; formControlName=&quot;art&quot; id=&quot;art&quot; class=&quot;form-control&quot; [(ngModel)]=&quot;Art&quot; required &gt;
                &lt;option value=&quot;festeAnmeldung&quot;&gt;feste Anmeldung&lt;/option&gt;
                &lt;option value=&quot;flexibleAnmeldung&quot;&gt;flexible Anmeldung&lt;/option&gt;
              &lt;/select&gt;
              &lt;label for=&quot;datum&quot;&gt;Beginn Datum&lt;/label&gt;
              &lt;input formControlName=&quot;datum&quot; type=&quot;date&quot; id=&quot;datum&quot; class=&quot;form-control&quot; required&gt;
              &lt;label *ngIf=&quot;(Art == 'festeAnmeldung')&quot; for=&quot;montag&quot;&gt;Montag&lt;/label&gt;
              &lt;input *ngIf=&quot;(Art == 'festeAnmeldung')&quot; formControlName=&quot;montag&quot; [disabled]=&quot;montag&quot; type=&quot;checkbox&quot; id=&quot;montag&quot; class=&quot;form-control wochentag&quot;&gt;
              &lt;label *ngIf=&quot;(Art == 'festeAnmeldung')&quot; for=&quot;dienstag&quot;&gt;Dienstag&lt;/label&gt;
              &lt;input *ngIf=&quot;(Art == 'festeAnmeldung')&quot; formControlName=&quot;dienstag&quot; [disabled]=&quot;dienstag&quot; type=&quot;checkbox&quot; id=&quot;dienstag&quot; class=&quot;form-control wochentag&quot;&gt;
              &lt;label *ngIf=&quot;(Art == 'festeAnmeldung')&quot; for=&quot;mittwoch&quot;&gt;Mittwoch&lt;/label&gt;
              &lt;input *ngIf=&quot;(Art == 'festeAnmeldung')&quot; formControlName=&quot;mittwoch&quot; [disabled]=&quot;mittwoch&quot; type=&quot;checkbox&quot; id=&quot;mittwoch&quot; class=&quot;form-control wochentag&quot;&gt;
              &lt;label *ngIf=&quot;(Art == 'festeAnmeldung')&quot; for=&quot;donnerstag&quot;&gt;Donnerstag&lt;/label&gt;
              &lt;input *ngIf=&quot;(Art == 'festeAnmeldung')&quot; formControlName=&quot;donnerstag&quot; [disabled]=&quot;donnerstag&quot; type=&quot;checkbox&quot; id=&quot;donnerstag&quot; class=&quot;form-control wochentag&quot;&gt;
              &lt;label *ngIf=&quot;(Art == 'festeAnmeldung')&quot; for=&quot;freitag&quot;&gt;Freitag&lt;/label&gt;
              &lt;input *ngIf=&quot;(Art == 'festeAnmeldung' )&quot; formControlName=&quot;freitag&quot; [disabled]=&quot;freitag&quot; type=&quot;checkbox&quot; id=&quot;freitag&quot; class=&quot;form-control wochentag&quot;&gt;
          &lt;button type=&quot;submit&quot; [disabled]=&quot;!BetreuungsoptionForm.valid&quot; class =&quot;btn btn-primary&quot;&gt;Speichern&lt;/button&gt;
          &lt;button type=&quot;button&quot; (click)=&quot;OnBetreuungsoptionInfos()&quot; class =&quot;btn btn-success&quot;&gt;weitere Informationen&lt;/button&gt;
          &lt;button type=&quot;button&quot; *ngIf=&quot;!gekuendigt&quot; (click)=&quot;OnBetreuungsoptionLoeschen()&quot; class =&quot;btn btn-danger&quot;&gt;Kündigen&lt;/button&gt;
        &lt;/form&gt;
  </code></pre>
  <p>myComponent.ts</p>
  <pre class="lang-ts prettyprint-override"><code>        this.BetreuungsoptionForm = new FormGroup
          ({
            art: new FormControl(),
            datum: new FormControl(this.BetreuungsoptionenKindRef[d].Beginn.toString().substring(0,10)),
            montag: new FormControl(this.BetreuungsoptionenKindRef[d].Montag),
            dienstag: new FormControl(this.BetreuungsoptionenKindRef[d].Dienstag),
            mittwoch: new FormControl(this.BetreuungsoptionenKindRef[d].Mittwoch),
            donnerstag: new FormControl(this.BetreuungsoptionenKindRef[d].Donnerstag),
            freitag: new FormControl(this.BetreuungsoptionenKindRef[d].Freitag)
          })
            if(this.BetreuungsoptionenKindRef.Montag)
            {
              this.montag = true;
            }
            if(this.BetreuungsoptionenKindRef.Dienstag)
            {
              this.dienstag = true;
            }
            if(this.BetreuungsoptionenKindRef.Mittwoch)
            {
              this.mittwoch = true;
            }
            if(this.BetreuungsoptionenKindRef.Donnerstag)
            {
              this.donnerstag = true;
            }
            if(this.BetreuungsoptionenKindRef.Freitag)
            {
              this.freitag = true;
            }
  </code></pre>