Angular - Disable select option if value exists in array -


i have nesting select element in form , want each value selected once. how can check if occupation.occupation exists in selectedoccupations array , set [disabled]='' true if exists?

component

  selectedoccupations: any[] = [     { occupation: 'dev' },   ];

template

<tr>           <td>             <md-select formcontrolname="occupation" [ngmodeloptions]="{standalone: true}" placeholder="occupation" (change)="filterguests($event, i)">               <md-option [value]="null">occupation</md-option>               <md-option *ngfor="let occupation of occupationz" [value]="occupation.occupation" [disabled]="">                 {{ occupation.occupation }}               </md-option>             </md-select>           </td>         </tr>

make call typescript function returns value you!

<tr>   <td>     <md-select formcontrolname="occupation" [ngmodeloptions]="{standalone: true}" placeholder="occupation" (change)="filterguests($event, i)">       <md-option [value]="null">occupation</md-option>       <md-option *ngfor="let occupation of occupationz" [value]="occupation.occupation" [disabled]="isdisabled(occupation)">         {{ occupation.occupation }}       </md-option>     </md-select>   </td> </tr>

and in typescript:

function isdisabled(occupation: any):boolean{     // if exists... disabled == true;     return selectedoccupations.includes(occupation.occupation); // note, i'm not if should occupation. }

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