form field validation (much better error messages)

src-ui/src/app/components/common/input/abstract-input.ts

@@ -30,6 +30,9 @@ export class AbstractInputComponent<T> implements OnInit, ControlValueAccessor {
   @Input()
   disabled = false;
 
+  @Input()
+  error: string
+
   value: T
 
   ngOnInit(): void {

src-ui/src/app/components/common/input/number/number.component.html

@@ -0,0 +1,8 @@
+<div class="form-group">
+  <label [for]="inputId">{{title}}</label>
+  <input type="number" class="form-control" [class.is-invalid]="error" [id]="inputId" [(ngModel)]="value" (change)="onChange(value)">
+  <small *ngIf="hint" class="form-text text-muted">{{hint}}</small>
+  <div class="invalid-feedback">
+    {{error}}
+  </div>
+</div>

src-ui/src/app/components/common/input/number/number.component.spec.ts

@@ -0,0 +1,25 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { NumberComponent } from './number.component';
+
+describe('NumberComponent', () => {
+  let component: NumberComponent;
+  let fixture: ComponentFixture<NumberComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ NumberComponent ]
+    })
+    .compileComponents();
+  });
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(NumberComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src-ui/src/app/components/common/input/number/number.component.ts

@@ -0,0 +1,21 @@
+import { Component, forwardRef } from '@angular/core';
+import { NG_VALUE_ACCESSOR } from '@angular/forms';
+import { AbstractInputComponent } from '../abstract-input';
+
+@Component({
+  providers: [{
+    provide: NG_VALUE_ACCESSOR,
+    useExisting: forwardRef(() => NumberComponent),
+    multi: true
+  }],
+  selector: 'app-input-number',
+  templateUrl: './number.component.html',
+  styleUrls: ['./number.component.scss']
+})
+export class NumberComponent extends AbstractInputComponent<number> {
+
+  constructor() {
+    super()
+  }
+
+}

src-ui/src/app/components/common/input/text/text.component.html

@@ -1,5 +1,8 @@
 <div class="form-group">
   <label [for]="inputId">{{title}}</label>
-  <input type="text" class="form-control" [id]="inputId" [(ngModel)]="value" (change)="onChange(value)">
+  <input type="text" class="form-control" [class.is-invalid]="error" [id]="inputId" [(ngModel)]="value" (change)="onChange(value)">
   <small *ngIf="hint" class="form-text text-muted">{{hint}}</small>
+  <div class="invalid-feedback">
+    {{error}}
+  </div>
 </div>