added create-from functionality

src/app/process-page/form/process-parameters/parameter-value-input/string-value-input/string-value-input.component.html

@@ -0,0 +1,7 @@
+<input required #string="ngModel" type="text" name="string-value-{{index}}" class="form-control" id="string-value-{{index}}" [ngModel]="value" (ngModelChange)="setValue($event)"/>
+<div *ngIf="string.invalid && (string.dirty || string.touched)"
+     class="alert alert-danger validation-error">
+    <div *ngIf="string.errors.required">
+        {{'process.new.parameter.string.required' | translate}}
+    </div>
+</div>

src/app/process-page/form/process-parameters/parameter-value-input/string-value-input/string-value-input.component.spec.ts

@@ -0,0 +1,72 @@
+import { async, ComponentFixture, fakeAsync, TestBed, tick } from '@angular/core/testing';
+
+import { FormsModule, NgForm } from '@angular/forms';
+import { TranslateLoader, TranslateModule } from '@ngx-translate/core';
+import { By } from '@angular/platform-browser';
+import { StringValueInputComponent } from './string-value-input.component';
+import { TranslateLoaderMock } from '../../../../../shared/mocks/translate-loader.mock';
+
+describe('StringValueInputComponent', () => {
+  let component: StringValueInputComponent;
+  let fixture: ComponentFixture<StringValueInputComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        FormsModule,
+        TranslateModule.forRoot({
+          loader: {
+            provide: TranslateLoader,
+            useClass: TranslateLoaderMock
+          }
+        })],
+      declarations: [StringValueInputComponent],
+      providers: [
+      ]
+    })
+      .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(StringValueInputComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+
+  it('should not show a validation error if the input field was left untouched but left empty', () => {
+    const validationError = fixture.debugElement.query(By.css('.validation-error'));
+    expect(validationError).toBeFalsy();
+  });
+
+  it('should show a validation error if the input field was touched but left empty', fakeAsync(() => {
+    component.value = '';
+    fixture.detectChanges();
+    tick();
+
+    const input = fixture.debugElement.query(By.css('input'));
+    input.triggerEventHandler('blur', null);
+
+    fixture.detectChanges();
+
+    const validationError = fixture.debugElement.query(By.css('.validation-error'));
+    expect(validationError).toBeTruthy();
+  }));
+
+  it('should not show a validation error if the input field was touched but not left empty', fakeAsync(() => {
+    component.value = 'testValue';
+    fixture.detectChanges();
+    tick();
+
+    const input = fixture.debugElement.query(By.css('input'));
+    input.triggerEventHandler('blur', null);
+
+    fixture.detectChanges();
+
+    const validationError = fixture.debugElement.query(By.css('.validation-error'));
+    expect(validationError).toBeFalsy();
+  }));
+});

src/app/process-page/form/process-parameters/parameter-value-input/string-value-input/string-value-input.component.ts

@@ -0,0 +1,32 @@
+import { Component, Optional, Input } from '@angular/core';
+import { ValueInputComponent } from '../value-input.component';
+import { ControlContainer, NgForm } from '@angular/forms';
+import { controlContainerFactory } from '../../../process-form.component';
+
+/**
+ * Represents the user inputted value of a string parameter
+ */
+@Component({
+  selector: 'ds-string-value-input',
+  templateUrl: './string-value-input.component.html',
+  styleUrls: ['./string-value-input.component.scss'],
+  viewProviders: [ { provide: ControlContainer,
+    useFactory: controlContainerFactory,
+    deps: [[new Optional(), NgForm]] } ]
+})
+export class StringValueInputComponent extends ValueInputComponent<string> {
+  /**
+   * The current value of the string
+   */
+  value: string;
+  @Input() initialValue;
+
+  ngOnInit() {
+    this.value = this.initialValue;
+  }
+  
+  setValue(value) {
+    this.value = value;
+    this.updateValue.emit(value)
+  }
+}