Best way to show error messages for angular reactive forms, one formcontrol multiple validation errors?

Question

I am showing reactive form error messages as per the suggested approach of angular angular form validation error example.

html code of showing error on the page

Answer 1

I've been working on an enterprise application that is primary form driven and ran into the same challenge. The best solution I could determine was wrapping all of my input controls in components. Then handling the validation display within the component. This allows consistent validation display without repeating the code multiple times in each form.

field-input-text.component.html

    
    
        This field is required
        This field is too short
        This field is too long
        Invalid value for this field
    

field-input-text-component.ts

    import { Component, OnInit } from '@angular/core';
    import { FormControl } from '@angular/forms';

    @Component({
      selector: 'app-field-input-text',
      templateUrl: './field-input-text.component.html'
    })
    export class FieldInputTextComponent implements OnInit, AfterViewInit {
      @Input() formControlItem: FormControl;
      @Input() maxlength: number;
      @Input() placeholder: string = '';

      constructor() { }

      ngOnInit() {
      }
    }

Usage

In the usage, you can see the space it saves without needing the extra validation lines. You can also reformat all of the validation in one place instead of touching every area.

The main disadvantage is not being able to use the formControl or formControlName attributes. I tried creating a custom ControlValueAccessor component but that did not help with the validation display.

I found your question searching to see if anyone else have found a better way. I know this answer is a little late but hopefully it helps.