编辑和更新功能在 angular 代码中不起作用

Question

我在编辑表格时遇到问题。单击编辑按钮时我无法获取表单值。只有值在控制台中可见。并且更新按钮也不起作用。

prepaid.component.html

<div><button style="margin:10px 0 0 50px;"mat-raised-button color="warn" routerLink="/addPlan"><mat-icon >add_circle_outline</mat-icon>Add Plan</button>
</div>

<div class="container" id="main-container">
  <div style="margin-top:10px">
      <mat-form-field appearance="standard">
          <mat-label>Search</mat-label>
          <input matInput placeholder="Ex." #input>
        </mat-form-field>
        
        <div ngFor="let row of plan" class="mat-elevation-z8">
          <table [dataSource]="dataSource" mat-table matSort>
            
            
            <!-- ID Column -->
            <ng-container matColumnDef="planType">
              <th mat-header-cell *matHeaderCellDef mat-sort-header> Type </th>
              <td mat-cell *matCellDef="let row"> {{row?.planType}} </td>
            </ng-container>
        
            <!-- Progress Column -->
            <ng-container matColumnDef="planName">
              <th mat-header-cell *matHeaderCellDef mat-sort-header> PlanName </th>
              <td mat-cell *matCellDef="let row"> {{row?.planName}} </td>
            </ng-container>
        
            <!-- Name Column -->
            <ng-container matColumnDef="planPrice">
              <th mat-header-cell *matHeaderCellDef mat-sort-header> Price </th>
              <td mat-cell *matCellDef="let row"> Rs.{{row?.planPrice}} </td>
            </ng-container>
        
            <!-- Fruit Column -->
            <ng-container matColumnDef="planDescription">
              <th mat-header-cell *matHeaderCellDef mat-sort-header> Description </th>
              <td mat-cell *matCellDef="let row"> {{row?.planDescription}} </td>
            </ng-container>

            <!-- Fruit Column -->
            <ng-container matColumnDef="planOffers">
              <th mat-header-cell *matHeaderCellDef mat-sort-header> Offers </th>
              <td mat-cell *matCellDef="let row"> {{row?.planOffers}} </td>
            </ng-container>

            <!-- Fruit Column -->
            <ng-container matColumnDef="planValidity">
              <th mat-header-cell *matHeaderCellDef mat-sort-header> Validity </th>
              <td mat-cell *matCellDef="let row"> {{row?.planValidity}} </td>
            </ng-container>

            <!-- Fruit Column -->
            <ng-container matColumnDef="action">
              <th mat-header-cell *matHeaderCellDef mat-sort-header> Action </th>
              <td mat-cell *matCellDef="let row"> 
                
              <a mat-icon-button color="primary"  routerLink="/editPlan/{{row.id}}" (click)="editPlan(row,row.id)">
                  <mat-icon>edit</mat-icon>
              </a> 
              <button mat-icon-button color="warn" (click)="deletePlan(row.id)">
                  <mat-icon>delete</mat-icon>
              </button>     
              </td>
            </ng-container>


        
            <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
            <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
        
            <!-- Row shown when there is no matching data. -->
            <tr class="mat-row" *matNoDataRow>
              <td class="mat-cell" colspan="4">No data matching the filter "{{input.value}}"</td>
            </tr>
          </table>
        
          <mat-paginator [pageSizeOptions]="[10, 25, 100]" aria-label="Select page of users"></mat-paginator>
        </div>
  </div>
</div>

prepaid.component.ts

import { Component, Input, OnInit,ViewChild } from '@angular/core';
import { AddPlanComponent } from '../add-plan/add-plan.component';
import { AdminApiService } from '../services/admin-api.service';
import {MatTableDataSource} from '@angular/material/table';
import {MatPaginator} from '@angular/material/paginator';
import {MatSort} from '@angular/material/sort';
import { Plan } from 'src/app/plan';
import {MatDialog} from '@angular/material/dialog';
import { HttpErrorResponse } from '@angular/common/http';
import { ActivatedRoute, Router } from '@angular/router';
import { FormBuilder, FormControl, FormGroup } from '@angular/forms';

@Component({
  selector: 'app-prepaid',
  templateUrl: './prepaid.component.html',
  styleUrls: ['./prepaid.component.css']
})
export class PrepaidComponent implements OnInit {
  plan!: Plan[];
  plandata!: Plan;
  editPlanData!:FormGroup;
  displayedColumns: string[] = ['planType', 'planName', 'planPrice','planDescription','planOffers','planValidity','action'];
  dataSource!: MatTableDataSource<any>;
  @ViewChild(MatPaginator) paginator!: MatPaginator;
  @ViewChild(MatSort) sort!: MatSort;


  
  constructor(private formBuilder:FormBuilder,public dialog: MatDialog,private api:AdminApiService,private route:ActivatedRoute) {}


  ngOnInit(): void{
    this.getPrePlan();

    this.editPlanData=this.formBuilder.group({
      id:[''],
      planName:[''],
      planType:[''],
      planPrice:[''],
      planOffers:[''],
      planValidity:[''],
      planDescription:['']
      
    });
  }
  

  public getPrePlan():void{
    this.api.getPlans()
    .subscribe({
      next:(response:Plan[])=>{
        this.plan=response;
        this.dataSource=new MatTableDataSource(response);
        this.dataSource.paginator=this.paginator;
        this.dataSource.sort=this.sort;
        
      },
      error:()=>{
        alert("Error while fetching records")
      }
    });
  }

  deletePlan(id:number){
    this.api.deletePlan(id)
    .subscribe({
      next:(res)=>{
        alert("Plan deleted successfully");
        this.getPrePlan();
      },
      error:()=>{
        alert("error on deleting");
      }
    });

  }
  editPlan(response:Plan,id:number){
    /*this.editPlanData.controls['id'].setValue(response.id);
    this.editPlanData.controls['planName'].setValue(response.planName);
    this.editPlanData.controls['planPrice'].setValue(response.planPrice);
    this.editPlanData.controls['planType'].setValue(response.planType);
    this.editPlanData.controls['planOffers'].setValue(response.planOffers);
    this.editPlanData.controls['planDescription'].setValue(response.planDescription);
    this.editPlanData.controls['planValidity'].setValue(response.planValidity);*/
    console.log(response);

  }

  }

编辑-plan.component.html

<div id="Editplan" class="example-container">
    <form ngFor="let editPlan of plan" [formGroup]="editPlanData">
      <mat-form-field hidden appearance="outline">
        <mat-label hidden>id</mat-label>
        <input hidden  matInput placeholder="Enter plan name" id="id" formControlName="id">
      </mat-form-field>
  
      <mat-form-field appearance="outline">
          <mat-label>Enter plan name</mat-label>
          <input matInput placeholder="Enter plan name" id="planName" formControlName="planName" required>
        </mat-form-field>
      
        <mat-form-field appearance="outline">
          <mat-label>Enter the plan price</mat-label>
          <input matInput placeholder="Enter the plan price" type="number" id="planPrice" formControlName="planPrice" required>
        </mat-form-field>
      
        <mat-form-field appearance="outline">
          <mat-label>Enter plan type</mat-label>
          <mat-select id="planType" formControlName="planType" required>
              <mat-option value="Prepaid">Prepaid</mat-option>
          </mat-select>
        </mat-form-field>
      
        <mat-form-field appearance="outline">
          <mat-label>Enter the offer for the plan</mat-label>
          <mat-select id="planOffers" formControlName="planOffers" required>
              <mat-option value="Netflix">Netflix</mat-option>
              <mat-option value="Amazon">Amazon</mat-option>
              <mat-option value="Hotstar">Hotstar</mat-option>
              <mat-option value="No Offer">None</mat-option>
          </mat-select>
        </mat-form-field>
      
        <mat-form-field appearance="outline">
          <mat-label>Enter plan validity</mat-label>
          <input matInput placeholder="Enter plan validity" id="planValidity" formControlName="planValidity" required>
        </mat-form-field>
      
        <mat-form-field appearance="outline">
          <mat-label>Enter plan description</mat-label>
          <textarea matInput placeholder="Enter plan description" id="planDescription" formControlName="planDescription" required></textarea>
        </mat-form-field>
    </form>
  
    <div mat-dialog-action [align]="'end'">
        <button class="save-btn" id="plan-details" mat-raised-button color="warn">Update</button>
    </div>
  </div>

编辑-plan.component.ts

import { Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTableDataSource } from '@angular/material/table';
import { Plan } from '../plan';
import { AdminApiService } from '../services/admin-api.service';
import { NgForm } from '@angular/forms';
import { FormBuilder, FormControl, FormGroup } from '@angular/forms';
@Component({
  selector: 'app-edit-plan',
  templateUrl: './edit-plan.component.html',
  styleUrls: ['./edit-plan.component.css']
})
export class EditPlanComponent implements OnInit {
  public plan!: Plan[];
  dataSource!: MatTableDataSource<any>;
  public editPlan!: Plan;
  editPlanData!:FormGroup;
  @ViewChild(MatPaginator) paginator!: MatPaginator;
  @ViewChild(MatSort) sort!: MatSort;
  constructor(private formBuilder:FormBuilder,private api: AdminApiService) { }

  ngOnInit(): void {
    this.editPlanData=this.formBuilder.group({
      id:[''],
      planName:[''],
      planType:[''],
      planPrice:[''],
      planOffers:[''],
      planValidity:[''],
      planDescription:['']
      
    });



    /*this.editPlanData.controls['id'].setValue(this.editPlan.id);
    this.editPlanData.controls['planName'].setValue(this.editPlan.planName);
    this.editPlanData.controls['planPrice'].setValue(this.editPlan.planPrice);
    this.editPlanData.controls['planType'].setValue(this.editPlan.planType);
    this.editPlanData.controls['planOffers'].setValue(this.editPlan.planOffers);
    this.editPlanData.controls['planDescription'].setValue(this.editPlan.planDescription);
    this.editPlanData.controls['planValidity'].setValue(this.editPlan.planValidity);*/
  }
  public getPrePlan():void{
    this.api.getPlans()
    .subscribe({
      next:(response:Plan[])=>{
        this.plan=response;
        this.dataSource=new MatTableDataSource(response);
        this.dataSource.paginator=this.paginator;
        this.dataSource.sort=this.sort;
        
      },
      error:()=>{
        alert("Error while fetching records")
      }
    });
  }

  public OnUpdatePlan(editForm:NgForm): void{
    this.api.updatePlan(this.editPlan.id,editForm.value)
    .subscribe({
      next:(response:Plan)=>{
        console.log(response);
        this.getPrePlan();
      },
      error:()=>{
        alert("Error while adding records")
      }
    });


  }

}

service.ts

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { environment } from 'src/environments/environment';
import { Plan } from 'src/app/plan'
import { Observable } from 'rxjs';
@Injectable({
  providedIn: 'root'
})
export class AdminApiService { 
  private apiServerUrl=environment.apiBaseUrl;
  
  constructor(private http : HttpClient) { }
  
  public getPlans(): Observable<Plan[]> {
    return this.http.get<Plan[]>(`${this.apiServerUrl}/prepaid-plan/all`);
  }

  public addPlan(plan: Plan): Observable<Plan> {
    return this.http.post<Plan>(`${this.apiServerUrl}/prepaid-plan/add`, plan);
  }

  updatePlan(planId:number,plan:Plan): Observable<Plan>{
    return this.http.put<Plan>(`${this.apiServerUrl}/prepaid-plan/update/`+planId,plan);
  }

  public deletePlan(planId: number): Observable<void> {
    return this.http.delete<void>(`${this.apiServerUrl}/prepaid-plan/delete/${planId}`);
  }
  


  
}

plan.ts

export interface Plan {
    id: number;
    planName: string;
    planType: string;
    planPrice: string;
    planOffers: string;
    planDescription: string;
    planValidity: string;
  }

输出一个

点击编辑按钮时的输出

如何获取编辑表单中的值？

Answer 1

你有两种方法：

将 Id 作为参数传递给页面（看起来你有代码）。为此，您需要阅读参数，订阅参数，调用服务并填写表格，如在 docs
在路由器之间传递数据，如this link show

Answer 2

你可以试试这个，你没有调用 setValue

this.editPlanData.setValue(response);

ngOnInit(): void {
 this.editPlanData=this.formBuilder.group({
  id:[''],
  planName:[''],
  planType:[''],
  planPrice:[''],
  planOffers:[''],
  planValidity:[''],
  planDescription:['']
  });
  this.getPrePlan();
 } 
public getPrePlan():void{
this.api.getPlans()
.subscribe({
  next:(response:Plan)=>{
    this.plan=response;
    this.editPlanData.setValue(response);
    this.dataSource=new MatTableDataSource(response);
    this.dataSource.paginator=this.paginator;
    this.dataSource.sort=this.sort;
    
  },
  error:()=>{
    alert("Error while fetching records")
  }
});
}

编辑和更新功能在 angular 代码中不起作用

Edit and update function is not working in angular code

typescript

angular-material

angular