Cannot find control with unspecified name attribute in angular 6 form builder

问题

I got this error message when trying to update the grid table with the HTML file.

Here I have used static data for the table to display and imported from other component which displays the primeng table and I have added an update button with a function which redirects to another page for updating of data.

The issue is seen in the first line in the HTML file i.e; [formGroup]="myvehicle"

I have tried checking with a different form group name but still the issue is same.

import { Component, OnInit } from '@angular/core';
import {Router, ActivatedRoute, Params} from '@angular/router';
import { FormBuilder, FormGroup } from '@angular/forms';

@Component({
  selector: 'app-crud',
  templateUrl: './crud.component.html',
})
export class CrudComponent implements OnInit {
  myvehicle: FormGroup;
  display: boolean;
  id: number;
  vin: any;
  year: number;
  brand: string;
  color: string;
  vehicle: any;
  Data: any;

  constructor(private activatedRoute: ActivatedRoute, private fb: FormBuilder) {
   }

  ngOnInit() {
    this.myvehicle = this.fb.group({
    vin: [''],
    year: [''],
    brand: [''],
    color: ['']
  });
    this.vehicle = [
      {
       id: 1 , vin: 'dsad231ff' , year : 2012 , brand: 'VW' , color: 'Orange'
      },
      {
        id: 2 , vin: 'gwregre345' , year : 2011 , brand: 'Audi' , color: 'Black'
      },
      {
        id: 3 , vin: 'h354htr' , year : 2005 , brand: 'Renault' , color: 'Gray'
      },
      {
        id: 4, vin: 'j6w54qgh' , year : 2003 , brand: 'BMW', color: 'Blue'
      },
      {
        id: 5, vin: 'hrtwy34' , year : 1995 , brand: 'Mercedes' , color: 'Orange'
      }
    ];
    debugger
    this.activatedRoute.paramMap
    .subscribe( params => {
    this.id = +params.get('id');
    });

      this.vehicle.forEach(element => {
        if (element.id === this.id) {
            this.Data = element;
              }
      });
      this.myvehicle.patchValue({
        vin: this.Data.vin,
        year: this.Data.year,
        brand: this.Data.brand,
        color:  this.Data.color
      });
  }

}

<form [formGroup]="myvehicle">
<label >Vin:</label>
<input type="text" [formControlName]="vin" ><br><br>
<label >Year:</label>
<input type="text" [formControlName]="year" ><br><br>
<label >Brand:</label>
<input type="text" [formControlName]="brand" ><br><br>
<label >Color:</label>
<input type="text" [formControlName]="color" ><br><br>
</form>

回答1:

I think the main problem is here

<input type="text" [formControlName]="vin" ><br><br>

you trying to pass an empty variable

vin: any;

as control name, this can be fixed in this way:

<input type="text" formControlName="vin" ><br><br>

just remove square brackets and set control name as string.

it should fix your issue.

also, this part

  this.activatedRoute.paramMap
.subscribe( params => {
this.id = +params.get('id');
});

  this.vehicle.forEach(element => {
    if (element.id === this.id) {
        this.Data = element;
          }
  });
  this.myvehicle.patchValue({
    vin: this.Data.vin,
    year: this.Data.year,
    brand: this.Data.brand,
    color:  this.Data.color
  });

can be simplified

    this.activatedRoute.paramMap
  .subscribe(params => {
    const id = params.get('id');

    if (this.vehicle[id]) {
      this.myvehicle.patchValue(this.vehicle[id]);
    }
  });

here patchValue runs only when you have a correct id in router params

来源：https://stackoverflow.com/questions/53831655/cannot-find-control-with-unspecified-name-attribute-in-angular-6-form-builder

标签

angular

angular6

angular-forms