Question

    <mat-autocomplete #auto="matAutocomplete">
 <mat-option *ngFor="let person of filteredPersons | async" [value]="person.name" (onSelectionChange)="selectedPersonsInDialog(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(person)">
          {{person}}  
          </mat-option>  
        </mat-autocomplete>

这是我在组件类中的方法： - 实际上 selectedPersonsInDialog函数被调用两次，总是如此显示2次对话框，其中最新选中，前一个选中值。

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}
    });
  }*

Answer 1

当选择更改事件在每个选项中传递时，所以获得了多个事件。但是在您选择的一个事件中$event.source.selected为true。所以你可以管理它。

你的HTML应该像

<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>

你的组件功能应该是

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

如何使用angular5防止角度材质中的对话框打开两次

1 个答案: