如何使用angular5防止在角度材质中打开两次对话框

当选择更改事件在每个选项中传递时，会得到多个事件。但是在您选择的一个事件中，您得到了

$event.source.selected

为

true

。所以你可以管理它

你的html应该是

I want to display a dialog only once with latest value selected.

selectedPersonsInDialog(person){
 this.selectedPerson=person;
alert(this.selectedPerson); 
 let dialogRef = this.dialog.open(AddListOfPersonDialog, {
      width: '500px',
      data: { person:this.selectedPerson}
    });
  }*

<mat-autocomplete #auto="matAutocomplete">
                <mat-option *ngFor="let person of filteredPersons | async" [value]="person.name"
                            (onSelectionChange)="selectedPersonsInDialog($event.source.selected,person)">
                    <img style="vertical-align:middle;" aria-hidden  src="{{person.imgUrl}}" width="30" height="30"/>
                    <span>{{ person.name }}</span>
                    <small>ID: {{person.id}}</small>
                </mat-option>
            </mat-autocomplete>
            <mat-autocomplete #auto="matAutocomplete">
            <mat-option *ngFor="let person of filteredPersons |  async" [value]="person.name"
                        (onSelectionChange)="selectedPersonsInDialog($event.source.selected,person)">
                {{person}}
             </mat-option>
        </mat-autocomplete>

---

你能创建一个工作的plunker或stackblitz吗？HTML:{{person.name}}ID:{{person.ID}请将其添加到代码中

<mat-autocomplete #auto="matAutocomplete">
                <mat-option *ngFor="let person of filteredPersons | async" [value]="person.name"
                            (onSelectionChange)="selectedPersonsInDialog($event.source.selected,person)">
                    <img style="vertical-align:middle;" aria-hidden  src="{{person.imgUrl}}" width="30" height="30"/>
                    <span>{{ person.name }}</span>
                    <small>ID: {{person.id}}</small>
                </mat-option>
            </mat-autocomplete>
            <mat-autocomplete #auto="matAutocomplete">
            <mat-option *ngFor="let person of filteredPersons |  async" [value]="person.name"
                        (onSelectionChange)="selectedPersonsInDialog($event.source.selected,person)">
                {{person}}
             </mat-option>
        </mat-autocomplete>

selectedPersonsInDialog(isSelected: boolean,person){
if(isSelected){
   this.selectedPerson=person;
   alert(this.selectedPerson); 
   let dialogRef = this.dialog.open(AddListOfPersonDialog, {
      width: '500px',
      data: { person:this.selectedPerson}
    });
  }
}