如何在firebase实时删除特定的孩子（Angular 7）

Question

我一直试图通过单击按钮来删除我的 firebase 实时数据库中的特定子项。分页器可用于我打算根据要求删除的孩子的列表。 下面是我已经走了多远。我已经尝试了所有可能的在线教程，但似乎都没有。要么删除整个父节点，要么显示成功消息，但没有任何效果。

<div fxLayout fxLayoutAlign="center center">
    <mat-form-field fxFlex="60%">
        <input matInput type="text" (keyup)="doFilter($event.target.value)" placeholder="Filter">
    </mat-form-field>
</div>



<table mat-table [dataSource]="dataSource" matSort>
    <ng-container matColumnDef="key">
        <th mat-header-cell *matHeaderCellDef> Action </th>
        <td mat-cell *matCellDef="let element" class="action-link">
            <a (click)="getID(item)">Approve</a> |
            <a (click)='delete(key,element)'>Delete</a>
        </td>
    </ng-container>
    <ng-container matColumnDef="name">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Name </th>
        <td mat-cell *matCellDef="let element"> {{element.name}} </td>
    </ng-container>

    <ng-container matColumnDef="phone">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> PhoneNumber </th>
        <td mat-cell *matCellDef="let element"> {{element.phone}} </td>
    </ng-container>

    <ng-container matColumnDef="cartype">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Car Type </th>
        <td mat-cell *matCellDef="let element"> {{element.cartype}} </td>
    </ng-container>

    <ng-container matColumnDef="destination">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Destination</th>
        <td mat-cell *matCellDef="let element"> {{element.destination}} </td>
    </ng-container>

    <ng-container matColumnDef="date">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Date </th>
        <td mat-cell *matCellDef="let element"> {{element.date | date: 'dd/MM/yyyy'}} </td>
    </ng-container>

    <ng-container matColumnDef="time">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Time </th>
        <td mat-cell *matCellDef="let element"> {{element.time}} </td>
    </ng-container>
    <ng-container matColumnDef="location">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Your Location </th>
        <td mat-cell *matCellDef="let element"> {{element.location}} </td>
    </ng-container>

    <ng-container matColumnDef="numberOfPersons">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> No of Persons </th>
        <td mat-cell *matCellDef="let element"> {{element.numberOfPersons}} </td>
    </ng-container>

    <ng-container matColumnDef="price">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Trip Price</th>
        <td mat-cell *matCellDef="let element"> {{element.price}} </td>
    </ng-container>




    <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>


<mat-paginator [pageSize]="6" [pageSizeOptions]="[2, 4, 6, 10, 20]">
</mat-paginator>

Ts

delete(key) {
  this.ph.scheduledRideSingle.remove(key).then(() => {
    alert('Success');
  });
}

Ph.ts

[![constructor() {
       this.scheduledRideSingle = firebase.database().ref(`userProfile/ScheduledRides`);

     }



  public scheduledRideSingle: any;

Answer 1

你需要使用remove():

remove

删除此数据库位置的数据。

子位置的所有数据也将被删除。

https://firebase.google.com/docs/reference/js/firebase.database.Reference#remove

例如：

var adaRef = firebase.database().ref('users/ada');
adaRef.remove()
  .then(function() {
    console.log("Remove succeeded.")
  })
  .catch(function(error) {
    console.log("Remove failed: " + error.message)
  });

如果要删除特定节点，请执行以下操作：

firebase.database.ref("userProfile/ScheduledRides").child(key).remove();