Angular材料表中的FormArray

Question

注意:我在经典HTML表中成功完成了FormArray,如下所示.我希望在Angular Material表中有一个FormArray并用数据填充它.我尝试了与经典HTML表格相同的方法,但我无法编译它,因为错误"无法找到带有'name'的列'''"

<div class="form-group">
<form [formGroup]="myForm" role="form">
  <div formArrayName="formArrList">
    <table>
      <tr>
        <th>Name</th>
        <th>School</th>

      </tr>

      <tr *ngFor="let list of myForm.get('formArrList').controls;let i = index" [formGroupName]="i">
        <td>
          <div class="col-sm-6">
            <input class="form-control" type="text"  formControlName="name"/>
          </div>
        </td>
        <td>
          <div class="col-sm-6">
            <input class="form-control" type="text"  formControlName="school"/>
          </div>
        </td>
      </tr>
    </table>
  </div>
</form>

我尝试在Angular Material Table中有一个FormArray这是我的HTML文件

<div>
<form [formGroup]="myForm" role="form">
  <ng-container formArrayName="formArrList">

  <mat-table #table [dataSource]="myDataSource">
    <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
    <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>


    <ng-container *ngFor="let detailsItems of myForm.get('formArrList').controls;let i = index" [formGroupName]="i">


    <ng-container matColumnDef="name">
      <mat-header-cell *matHeaderCellDef>Name</mat-header-cell>
      <mat-cell *matCellDef="let element"> 

        <mat-form-field class="" hideRequiredMarker>
      <input matInput formControlName="name" type="text" class="form-control"
             autocomplete="off"
             placeholder="name">
      </mat-form-field>

      </mat-cell>
    </ng-container>



    <ng-container matColumnDef="school">
      <mat-header-cell *matHeaderCellDef>School</mat-header-cell>
      <mat-cell *matCellDef="let element"> 

       <mat-form-field class="" hideRequiredMarker>
      <input matInput formControlName="school" type="text" class="form-control"
             autocomplete="off"
             placeholder="school">
      </mat-form-field>
      </mat-cell>
    </ng-container>

    </ng-container>



  </mat-table>
  </ng-container>

</form>

这是我的.TS文件的一部分

@Component(..)
export class DemO implements OnInit {

 displayedColumns = ['name', 'school'];
  myForm: FormGroup;

  formArrList: FormArray;

   myDataSource: DataSource;
   dummyData: Element[] = [];


   ngOnInit(): void {

    //init form arrayTree
    this.myForm = this.formBuilder.group({
      'formArrList': new FormArray([])
    });

  }

    initTreeFormArray(name: string, school: string) {
    return this.formBuilder.group({
      'name': [code_any,],
      'school': [prio,]
    });
  }


  renderTableOnButtonClick(){
       const control = <FormArray>this.treeForm.controls['formArrList']; 
       control.push(this.initTreeFormArray("DummyName", "DummySchool", element.name));



      this.dummyData.push({name: "DummyName", school: "DummySchool"});
      this.myDataSource = new sDataSource(this.dummyData);


}

Answer 1

聚会有点晚了，但我设法让它发挥作用。

https://stackblitz.com/edit/angular-material-table-with-form-59imvq

成分

import {
  Component, ElementRef, OnInit
} from '@angular/core';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators'
import { AlbumService } from './album.service';
import { UserService } from './user.service';
import { Album } from './album.model';
import { User } from './user.model';
import { FormArray, FormGroup, FormBuilder } from '@angular/forms';
import { MatTableDataSource } from '@angular/material';

@Component({
  selector: 'table-form-app',
  templateUrl: 'app.component.html'
})
export class AppComponent implements OnInit {
  form: FormGroup;
  users: User[] = [];
  dataSource: MatTableDataSource<any>;
  displayedColumns = ['id', 'userId', 'title']
  constructor(
    private _albumService: AlbumService,
    private _userService: UserService,
    private _formBuilder: FormBuilder
    ) {}

  ngOnInit() {
    this.form = this._formBuilder.group({
      albums: this._formBuilder.array([])
    });
    this._albumService.getAllAsFormArray().subscribe(albums => {
      this.form.setControl('albums', albums);
      this.dataSource = new MatTableDataSource((this.form.get('albums') as FormArray).controls);
      this.dataSource.filterPredicate = (data: FormGroup, filter: string) => { 
          return Object.values(data.controls).some(x => x.value == filter); 
        };
    });
    this._userService.getAll().subscribe(users => {
      this.users = users;
    })
  }

  get albums(): FormArray {
    return this.form.get('albums') as FormArray;
  }

  // On user change I clear the title of that album 
  onUserChange(event, album: FormGroup) {
    const title = album.get('title');

    title.setValue(null);
    title.markAsUntouched();
    // Notice the ngIf at the title cell definition. The user with id 3 can't set the title of the albums
  }

  applyFilter(filterValue: string) {
    this.dataSource.filter = filterValue.trim().toLowerCase();
  }
}

超文本标记语言

import {
  Component, ElementRef, OnInit
} from '@angular/core';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators'
import { AlbumService } from './album.service';
import { UserService } from './user.service';
import { Album } from './album.model';
import { User } from './user.model';
import { FormArray, FormGroup, FormBuilder } from '@angular/forms';
import { MatTableDataSource } from '@angular/material';

@Component({
  selector: 'table-form-app',
  templateUrl: 'app.component.html'
})
export class AppComponent implements OnInit {
  form: FormGroup;
  users: User[] = [];
  dataSource: MatTableDataSource<any>;
  displayedColumns = ['id', 'userId', 'title']
  constructor(
    private _albumService: AlbumService,
    private _userService: UserService,
    private _formBuilder: FormBuilder
    ) {}

  ngOnInit() {
    this.form = this._formBuilder.group({
      albums: this._formBuilder.array([])
    });
    this._albumService.getAllAsFormArray().subscribe(albums => {
      this.form.setControl('albums', albums);
      this.dataSource = new MatTableDataSource((this.form.get('albums') as FormArray).controls);
      this.dataSource.filterPredicate = (data: FormGroup, filter: string) => { 
          return Object.values(data.controls).some(x => x.value == filter); 
        };
    });
    this._userService.getAll().subscribe(users => {
      this.users = users;
    })
  }

  get albums(): FormArray {
    return this.form.get('albums') as FormArray;
  }

  // On user change I clear the title of that album 
  onUserChange(event, album: FormGroup) {
    const title = album.get('title');

    title.setValue(null);
    title.markAsUntouched();
    // Notice the ngIf at the title cell definition. The user with id 3 can't set the title of the albums
  }

  applyFilter(filterValue: string) {
    this.dataSource.filter = filterValue.trim().toLowerCase();
  }
}

Answer 2

initTreeFormArray()不会按照您需要的方式触发 init 。因此，当构建组件时，html 部分会查找名称（当名称不存在时）。

我的 .02 是在 init 上加载工作表单和子表单组，并稍后找出第二个函数。另外，使用 Mat 而不是 html 表。