feat(forms): support for dynamic control change

projects/angular/clarity.api.md

@@ -64,6 +64,14 @@ export class CdsIconCustomTag {
     static ɵfac: i0.ɵɵFactoryDeclaration<CdsIconCustomTag, never>;
 }
 
+// @public (undocumented)
+export enum CHANGE_KEYS {
+    // (undocumented)
+    FORM = "form",
+    // (undocumented)
+    MODEL = "model"
+}
+
 // @public (undocumented)
 export class ClarityModule {
     // (undocumented)
@@ -4822,7 +4830,7 @@ export const TOGGLE_SERVICE_PROVIDER: {
 export function ToggleServiceFactory(): BehaviorSubject<boolean>;
 
 // @public (undocumented)
-export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, OnDestroy {
+export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, DoCheck, OnDestroy {
     constructor(vcr: ViewContainerRef, wrapperType: Type<W>, injector: Injector, ngControl: NgControl, renderer: Renderer2, el: ElementRef);
     // (undocumented)
     protected controlIdService: ControlIdService;
@@ -4840,6 +4848,8 @@ export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, OnD
     // (undocumented)
     protected ngControlService: NgControlService;
     // (undocumented)
+    ngDoCheck(): void;
+    // (undocumented)
     ngOnDestroy(): void;
     // (undocumented)
     ngOnInit(): void;

projects/angular/src/forms/common/wrapped-control.spec.ts

@@ -6,7 +6,7 @@
 
 import { Component, Directive, ElementRef, Injector, NgModule, Renderer2, Type, ViewContainerRef } from '@angular/core';
 import { ComponentFixture, fakeAsync, TestBed, tick } from '@angular/core/testing';
-import { FormsModule, NgControl } from '@angular/forms';
+import { FormControl, FormGroup, FormsModule, NgControl, ReactiveFormsModule } from '@angular/forms';
 import { By } from '@angular/platform-browser';
 
 import { DynamicWrapper } from '../../utils/host-wrapping/dynamic-wrapper';
@@ -15,7 +15,7 @@ import { ClrHostWrappingModule } from '../../utils/host-wrapping/host-wrapping.m
 import { ClrAbstractContainer } from './abstract-container';
 import { ClrControlError } from './error';
 import { ClrControlHelper } from './helper';
-import { IfControlStateService } from './if-control-state/if-control-state.service';
+import { CONTROL_STATE, IfControlStateService } from './if-control-state/if-control-state.service';
 import { ControlClassService } from './providers/control-class.service';
 import { ControlIdService } from './providers/control-id.service';
 import { LayoutService } from './providers/layout.service';
@@ -193,6 +193,45 @@ class WithControlAndSuccess {
   model = '';
 }
 
+@Component({
+  template: `
+    <form-wrapper>
+      <test-wrapper3>
+        <label> Label </label>
+        <textarea testControl3 [formControl]="form.get('control') || form.get('alternative')"></textarea>
+        <clr-control-success>Successful!</clr-control-success>
+      </test-wrapper3>
+    </form-wrapper>
+  `,
+})
+class WithDynamicFormControl {
+  form = new FormGroup<any>({
+    alternative: new FormControl(),
+  });
+
+  addControl() {
+    this.form.addControl('control', new FormControl('TEST'));
+  }
+}
+
+@Component({
+  template: `
+    <form-wrapper>
+      <test-wrapper3>
+        <label> Label </label>
+        <textarea testControl3 [(ngModel)]="form['control']"></textarea>
+        <clr-control-success>Successful!</clr-control-success>
+      </test-wrapper3>
+    </form-wrapper>
+  `,
+})
+class WithDynamicNgControl {
+  form = {};
+  addControl() {
+    this.form['control'] = 'TEST';
+  }
+}
+
 interface TestContext {
   fixture: ComponentFixture<any>;
   wrapper: TestWrapper;
@@ -210,7 +249,7 @@ export default function (): void {
   describe('WrappedFormControl', () => {
     function setupTest<T>(testContext: TestContext, testComponent: Type<T>, testControl: any) {
       TestBed.configureTestingModule({
-        imports: [WrappedFormControlTestModule, FormsModule],
+        imports: [WrappedFormControlTestModule, FormsModule, ReactiveFormsModule],
         declarations: [testComponent, ClrControlError, ClrControlHelper, ClrControlSuccess],
       });
       testContext.fixture = TestBed.createComponent(testComponent);
@@ -339,6 +378,30 @@ export default function (): void {
       });
     });
 
+    describe('with dynamic controls', function () {
+      it('with form-control directive', function (this: TestContext) {
+        setupTest(this, WithDynamicFormControl, TestControl3);
+        const cb = jasmine.createSpy('cb');
+        const sub = this.ifControlStateService.statusChanges.subscribe((control: CONTROL_STATE) => cb(control));
+        expect(cb).toHaveBeenCalledWith(CONTROL_STATE.NONE);
+        this.fixture.componentInstance.addControl();
+        this.fixture.detectChanges();
+        expect(cb).toHaveBeenCalledWith(CONTROL_STATE.VALID);
+        sub.unsubscribe();
+      });
+
+      it('with ng-control directive', function (this: TestContext) {
+        setupTest(this, WithDynamicNgControl, TestControl3);
+        const cb = jasmine.createSpy('cb');
+        const sub = this.ifControlStateService.statusChanges.subscribe((control: CONTROL_STATE) => cb(control));
+        expect(cb).toHaveBeenCalledWith(CONTROL_STATE.NONE);
+        this.fixture.componentInstance.addControl();
+        this.fixture.detectChanges();
+        expect(cb).toHaveBeenCalledWith(CONTROL_STATE.VALID);
+        sub.unsubscribe();
+      });
+    });
+
     describe('aria roles', function () {
       it('adds the aria-describedby for helper', function () {
         setupTest(this, WithControlAndHelper, TestControl3);

projects/angular/src/forms/common/wrapped-control.ts

@@ -6,12 +6,15 @@
 
 import {
   Directive,
+  DoCheck,
   ElementRef,
   HostBinding,
   HostListener,
   InjectionToken,
   Injector,
   Input,
+  KeyValueDiffer,
+  KeyValueDiffers,
   OnDestroy,
   OnInit,
   Renderer2,
@@ -31,8 +34,13 @@ import { ControlIdService } from './providers/control-id.service';
 import { MarkControlService } from './providers/mark-control.service';
 import { Helpers, NgControlService } from './providers/ng-control.service';
 
+export enum CHANGE_KEYS {
+  FORM = 'form',
+  MODEL = 'model',
+}
+
 @Directive()
-export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, OnDestroy {
+export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, DoCheck, OnDestroy {
   _id: string;
 
   protected renderer: Renderer2;
@@ -47,6 +55,8 @@ export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, OnD
   private markControlService: MarkControlService;
   private containerIdService: ContainerIdService;
   private _containerInjector: Injector;
+  private differs: KeyValueDiffers;
+  private differ: KeyValueDiffer<any, any>;
 
   // I lost way too much time trying to make this work without injecting the ViewContainerRef and the Injector,
   // I'm giving up. So we have to inject these two manually for now.
@@ -66,6 +76,7 @@ export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, OnD
       this.ifControlStateService = injector.get(IfControlStateService, null);
       this.controlClassService = injector.get(ControlClassService, null);
       this.markControlService = injector.get(MarkControlService, null);
+      this.differs = injector.get(KeyValueDiffers, null);
     }
 
     if (this.controlClassService) {
@@ -86,6 +97,10 @@ export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, OnD
         })
       );
     }
+
+    if (ngControl) {
+      this.differ = this.differs.find(ngControl).create();
+    }
   }
 
   @Input()
@@ -120,6 +135,22 @@ export class WrappedFormControl<W extends DynamicWrapper> implements OnInit, OnD
     }
   }
 
+  ngDoCheck() {
+    if (this.differ) {
+      const changes = this.differ.diff(this.ngControl);
+      if (changes) {
+        changes.forEachChangedItem(change => {
+          if (
+            (change.key === CHANGE_KEYS.FORM || change.key === CHANGE_KEYS.MODEL) &&
+            change.currentValue !== change.previousValue
+          ) {
+            this.triggerValidation();
+          }
+        });
+      }
+    }
+  }
+
   ngOnDestroy() {
     this.subscriptions.forEach(sub => sub.unsubscribe());
   }

projects/demo/src/app/forms/dynamic-controls/dynamic-controls.demo.html

@@ -0,0 +1,46 @@
+<h1>Dynamic Control Demo</h1>
+
+<p>
+  We have a State service which have three statuses: NONE, INVALID, VALID. Success and Error messages are shown based on
+  the value of this state service but if you bind formControl \ ngModel to a control that is currently not available and
+  then add it dynamically with initial value while marking it as touched and updateValueValidility status change doesn't
+  trigger and state service value is not updated.
+</p>
+<br />
+<label for="steps"> Steps to test:</label>
+<ul id="steps" style="list-style-type: none">
+  <li>1. Choose scenario two ( text area appears but the control binded to formControl is missing )</li>
+  <li>2. Choose platform two which is adding the control used in the binding with a initial value.</li>
+  <li>3. Control should be valid and in success state.</li>
+</ul>
+
+<h2>Reactive form</h2>
+<form [formGroup]="form">
+  <clr-select-container>
+    <label>Choose Platform</label>
+    <select class="w-60" clrSelect formControlName="platform">
+      <option value="one">One</option>
+      <option value="two">Two</option>
+    </select>
+    <clr-control-error> Required </clr-control-error>
+  </clr-select-container>
+  <clr-radio-container clrInline>
+    <label>Scenario</label>
+    <clr-radio-wrapper>
+      <input type="radio" clrRadio [name]="'scenario'" value="one" formControlName="scenario" />
+      <label>One</label>
+    </clr-radio-wrapper>
+    <clr-radio-wrapper>
+      <input type="radio" clrRadio [name]="'scenario'" value="two" formControlName="scenario" />
+      <label>Two</label>
+    </clr-radio-wrapper>
+    <clr-control-error> {{ 'REQUIRED' }} </clr-control-error>
+  </clr-radio-container>
+  <clr-textarea-container *ngIf="form.get('scenario')?.value === 'two'">
+    <label>Label</label>
+    <textarea clrTextarea [formControl]="$any(form).get('control')" required></textarea>
+    <clr-control-helper>Helper Message</clr-control-helper>
+    <clr-control-success>Successful</clr-control-success>
+    <clr-control-error>Required error</clr-control-error>
+  </clr-textarea-container>
+</form>

projects/demo/src/app/forms/dynamic-controls/dynamic-controls.demo.ts

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2016-2023 VMware, Inc. All Rights Reserved.
+ * This software is released under MIT license.
+ * The full license information can be found in LICENSE in the root directory of this project.
+ */
+
+import { ChangeDetectorRef, Component } from '@angular/core';
+import { FormControl, FormGroup } from '@angular/forms';
+import { Subject } from 'rxjs';
+import { filter, takeUntil, tap } from 'rxjs/operators';
+
+@Component({
+  selector: 'dynamic-controls-demo',
+  templateUrl: './dynamic-controls.demo.html',
+})
+export class DynamicControlsDemo {
+  destroyed = new Subject();
+  form = new FormGroup<any>({
+    platform: new FormControl(),
+    scenario: new FormControl('one'),
+  });
+
+  constructor(private cd: ChangeDetectorRef) {}
+
+  ngOnInit() {
+    this.form
+      .get('platform')
+      ?.valueChanges.pipe(
+        filter(value => value === 'two'),
+        tap(() => {
+          this.form.addControl('control', new FormControl('test'));
+          this.form.get('control')?.markAsTouched();
+          this.form.get('control')?.updateValueAndValidity();
+        }),
+        takeUntil(this.destroyed)
+      )
+      .subscribe();
+  }
+
+  ngOnDestroy() {
+    this.destroyed.next();
+    this.destroyed.complete();
+  }
+}

projects/demo/src/app/forms/forms.demo.module.ts

@@ -17,6 +17,7 @@ import { FormsRadioDemo } from './controls/radio';
 import { FormsSelectDemo } from './controls/select';
 import { FormsTextDemo } from './controls/text';
 import { FormsTextareaDemo } from './controls/textarea';
+import { DynamicControlsDemo } from './dynamic-controls/dynamic-controls.demo';
 import { FormsDemo } from './forms.demo';
 import { ROUTING } from './forms.demo.routing';
 import { FormsGenericContainerDemo } from './generic-container/generic-container';
@@ -69,6 +70,7 @@ import { FormsValidationDemo } from './validation/validation';
     FormsA11yDemo,
     FormsGenericContainerDemo,
     FormsValidationDemo,
+    DynamicControlsDemo,
   ],
   exports: [
     FormsDemo,
@@ -97,6 +99,7 @@ import { FormsValidationDemo } from './validation/validation';
     FormsA11yDemo,
     FormsGenericContainerDemo,
     FormsValidationDemo,
+    DynamicControlsDemo,
   ],
 })
 export class FormsDemoModule {}

projects/demo/src/app/forms/forms.demo.routing.ts

@@ -14,6 +14,7 @@ import { FormsRadioDemo } from './controls/radio';
 import { FormsSelectDemo } from './controls/select';
 import { FormsTextDemo } from './controls/text';
 import { FormsTextareaDemo } from './controls/textarea';
+import { DynamicControlsDemo } from './dynamic-controls/dynamic-controls.demo';
 import { FormsDemo } from './forms.demo';
 import { FormsGenericContainerDemo } from './generic-container/generic-container';
 import { FormsInputGroupDemo } from './input-group/input-group';
@@ -67,6 +68,7 @@ const ROUTES: Routes = [
       { path: 'a11y', component: FormsA11yDemo },
       { path: 'generic-container', component: FormsGenericContainerDemo },
       { path: 'validation', component: FormsValidationDemo },
+      { path: 'dynamic-controls', component: DynamicControlsDemo },
     ],
   },
 ];

projects/demo/src/app/forms/forms.demo.ts

@@ -46,6 +46,7 @@ import { Component } from '@angular/core';
       <li><a [routerLink]="['./a11y']">a11y</a></li>
       <li><a [routerLink]="['./generic-container']">Generic Container</a></li>
       <li><a [routerLink]="['./validation']">Validation</a></li>
+      <li><a [routerLink]="['./dynamic-controls']">Dynamic Controls Reproduction</a></li>
     </ul>
     <router-outlet></router-outlet>
   `,