Mat-autocomplete – ¿Cómo acceder a la opción seleccionada?

Solución:

Puedes usarlo como:

<mat-autocomplete #auto="matAutocomplete" (optionSelected)='getPosts($event.option.value)'>

DEMO DE TRABAJO

Se puede hacer de dos formas.

1. Utilizando onSelectionChange que emite MatOptionSelectionChange de mat-option

<mat-autocomplete #auto="matAutocomplete">
    <mat-option
      *ngFor="let option of options"
      [value]="option"
      (onSelectionChange)="updateMySelection($event)"
    >
      {{ option }}
    </mat-option>
</mat-autocomplete>

2. Utilizando optionSelected que emite MatAutocompleteSelectedEvent de mat-autocomplete

<mat-autocomplete 
  #auto="matAutocomplete"
  (optionSelected)="updateMySelection($event)">
    <mat-option
      *ngFor="let option of options"
      [value]="option"
    >
      {{ option }}
    </mat-option>
</mat-autocomplete>

 <mat-form-field floatLabel="always">
            <mat-label>UTBMS Activity Codes</mat-label>
            <input type="text" placeholder="Activity Codes"  [(ngModel)]="activityCode"  aria-label="Number" matInput [formControl]="utbmsActivityCodesControl"
              [matAutocomplete]="autoActivityCodes">
            <mat-autocomplete autoActiveFirstOption #autoActivityCodes="matAutocomplete">
              <mat-option *ngFor="let option of utbmsActivityCodes | async" (onSelectionChange)="setBillingActivity(option)"  [value]="option.code">
                {{option.name}}
              </mat-option>
            </mat-autocomplete>
          </mat-form-field>

setBillingActivity(object){
    this.actionData.libraryContent.billingActivityId=object.activityId;
  }

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