fix(angular): min/max validator for ion-input type number (#27993)

Issue number: Resolves #23480

---------

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issue. -->

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etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

Angular's min/max validators do not work with `ion-input[type=number]`.
Using the built-in validators with `ion-input` will not update the
control status to invalid, reflect the `ng-invalid` class or report the
correct errors.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- The `IonicModule` now includes two additional directive declarations
that extend Angular's built-in min/max validators and target the
`ion-input` component when using `type="number"`.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

packages/angular/src/directives/validators/index.ts

@@ -0,0 +1,2 @@
+export * from './max-validator';
+export * from './min-validator';

packages/angular/src/directives/validators/max-validator.ts

@@ -0,0 +1,22 @@
+import { Directive, forwardRef, Provider } from '@angular/core';
+import { MaxValidator, NG_VALIDATORS } from '@angular/forms';
+
+/**
+ * @description
+ * Provider which adds `MaxValidator` to the `NG_VALIDATORS` multi-provider list.
+ */
+export const ION_MAX_VALIDATOR: Provider = {
+  provide: NG_VALIDATORS,
+  useExisting: forwardRef(() => IonMaxValidator),
+  multi: true,
+};
+
+@Directive({
+  selector:
+    'ion-input[type=number][max][formControlName],ion-input[type=number][max][formControl],ion-input[type=number][max][ngModel]',
+  providers: [ION_MAX_VALIDATOR],
+  // eslint-disable-next-line @angular-eslint/no-host-metadata-property
+  host: { '[attr.max]': '_enabled ? max : null' },
+})
+// eslint-disable-next-line @angular-eslint/directive-class-suffix
+export class IonMaxValidator extends MaxValidator {}

packages/angular/src/directives/validators/min-validator.ts

@@ -0,0 +1,22 @@
+import { Directive, forwardRef, Provider } from '@angular/core';
+import { MinValidator, NG_VALIDATORS } from '@angular/forms';
+
+/**
+ * @description
+ * Provider which adds `MinValidator` to the `NG_VALIDATORS` multi-provider list.
+ */
+export const ION_MIN_VALIDATOR: Provider = {
+  provide: NG_VALIDATORS,
+  useExisting: forwardRef(() => IonMinValidator),
+  multi: true,
+};
+
+@Directive({
+  selector:
+    'ion-input[type=number][min][formControlName],ion-input[type=number][min][formControl],ion-input[type=number][min][ngModel]',
+  providers: [ION_MIN_VALIDATOR],
+  // eslint-disable-next-line @angular-eslint/no-host-metadata-property
+  host: { '[attr.min]': '_enabled ? min : null' },
+})
+// eslint-disable-next-line @angular-eslint/directive-class-suffix
+export class IonMinValidator extends MinValidator {}

packages/angular/src/index.ts

@@ -17,6 +17,7 @@ export { NavParams } from './directives/navigation/nav-params';
 export { IonModal } from './directives/overlays/modal';
 export { IonPopover } from './directives/overlays/popover';
 export * from './directives/proxies';
+export * from './directives/validators';
 
 // PROVIDERS
 export { AngularDelegate } from './providers/angular-delegate';

packages/angular/src/ionic-module.ts

@@ -22,6 +22,7 @@ import {
 import { IonModal } from './directives/overlays/modal';
 import { IonPopover } from './directives/overlays/popover';
 import { DIRECTIVES } from './directives/proxies-list';
+import { IonMaxValidator, IonMinValidator } from './directives/validators';
 import { AngularDelegate } from './providers/angular-delegate';
 import { ConfigToken } from './providers/config';
 import { ModalController } from './providers/modal-controller';
@@ -49,6 +50,10 @@ const DECLARATIONS = [
   NavDelegate,
   RouterLinkDelegateDirective,
   RouterLinkWithHrefDelegateDirective,
+
+  // validators
+  IonMinValidator,
+  IonMaxValidator,
 ];
 
 @NgModule({

packages/angular/test/base/e2e/src/form.spec.ts

@@ -30,6 +30,8 @@ describe('Form', () => {
         toggle: false,
         input: '',
         input2: 'Default Value',
+        inputMin: 1,
+        inputMax: 1,
         checkbox: false
       });
     });
@@ -55,6 +57,8 @@ describe('Form', () => {
         toggle: false,
         input: 'Some value',
         input2: 'Default Value',
+        inputMin: 1,
+        inputMax: 1,
         checkbox: false
       });
     });
@@ -67,6 +71,8 @@ describe('Form', () => {
         toggle: true,
         input: '',
         input2: 'Default Value',
+        inputMin: 1,
+        inputMax: 1,
         checkbox: false
       });
     });
@@ -79,6 +85,8 @@ describe('Form', () => {
         toggle: false,
         input: '',
         input2: 'Default Value',
+        inputMin: 1,
+        inputMax: 1,
         checkbox: true
       });
     });
@@ -99,6 +107,8 @@ describe('Form', () => {
         toggle: true,
         input: '',
         input2: 'Default Value',
+        inputMin: 1,
+        inputMax: 1,
         checkbox: false
       });
       cy.get('ion-checkbox').click();
@@ -108,10 +118,39 @@ describe('Form', () => {
         toggle: true,
         input: '',
         input2: 'Default Value',
+        inputMin: 1,
+        inputMax: 1,
         checkbox: true
       });
     });
   });
+
+  describe('validators', () => {
+
+    it('ion-input should error with min set', () => {
+      const control = cy.get('form ion-input[formControlName="inputMin"]');
+
+      control.should('have.class', 'ng-valid');
+
+      control.type('{backspace}0');
+
+      control.within(() => cy.get('input').blur());
+
+      control.should('have.class', 'ng-invalid');
+    });
+
+    it('ion-input should error with max set', () => {
+      const control = cy.get('form ion-input[formControlName="inputMax"]');
+
+      control.should('have.class', 'ng-valid');
+
+      control.type('2');
+      control.within(() => cy.get('input').blur());
+
+      control.should('have.class', 'ng-invalid');
+    });
+
+  });
 });
 
 function testStatus(status) {

packages/angular/test/base/src/app/form/form.component.html

@@ -1,15 +1,12 @@
 <ion-header>
   <ion-toolbar>
-    <ion-title>
-      Forms test
-    </ion-title>
+    <ion-title> Forms test </ion-title>
   </ion-toolbar>
 </ion-header>
 
 <ion-content>
   <form [formGroup]="profileForm" (ngSubmit)="onSubmit()">
     <ion-list>
-
       <ion-item>
         <ion-label>DateTime</ion-label>
         <ion-datetime formControlName="datetime" min="1994-03-14" max="2017-12-09" display-format="MM/DD/YYYY">
@@ -29,13 +26,16 @@
       </ion-item>
 
       <ion-item>
-        <ion-toggle formControlName="toggle">
-          Toggle
-        </ion-toggle>
+        <ion-toggle formControlName="toggle"> Toggle </ion-toggle>
       </ion-item>
 
       <ion-item>
-        <ion-input label="Input (required)" formControlName="input" class="required" id="touched-input-test"></ion-input>
+        <ion-input
+          label="Input (required)"
+          formControlName="input"
+          class="required"
+          id="touched-input-test"
+        ></ion-input>
       </ion-item>
 
       <ion-button id="input-touched" (click)="setTouched()">Set Input Touched</ion-button>
@@ -45,11 +45,20 @@
       </ion-item>
 
       <ion-item>
-        <ion-checkbox formControlName="checkbox">
-          Checkbox
-        </ion-checkbox>
+        <ion-checkbox formControlName="checkbox"> Checkbox </ion-checkbox>
       </ion-item>
 
+      <ion-item>
+        <ion-label>Min</ion-label>
+        <ion-input formControlName="inputMin" type="number"></ion-input>
+        <pre>errors: {{ profileForm.controls['inputMin'].errors | json }}</pre>
+      </ion-item>
+
+      <ion-item>
+        <ion-label>Max</ion-label>
+        <ion-input formControlName="inputMax" type="number"></ion-input>
+        <pre>errors: {{ profileForm.controls['inputMax'].errors | json }}</pre>
+      </ion-item>
     </ion-list>
     <p>
       Form Status: <span id="status">{{ profileForm.status }}</span>
@@ -58,18 +67,15 @@
       Form value: <span id="data">{{ profileForm.value | json }}</span>
     </p>
     <p>
-      Form Submit: <span id="submit">{{submitted}}</span>
+      Form Submit: <span id="submit">{{ submitted }}</span>
     </p>
     <ion-button id="mark-all-touched-button" (click)="markAllAsTouched()">Mark all as touched</ion-button>
     <ion-button id="submit-button" type="submit" [disabled]="!profileForm.valid">Submit</ion-button>
-
   </form>
   <ion-list>
     <ion-item>
-      <ion-toggle [formControl]="outsideToggle">
-        Outside form
-      </ion-toggle>
-      <ion-note slot="end">{{outsideToggle.value}}</ion-note>
+      <ion-toggle [formControl]="outsideToggle"> Outside form </ion-toggle>
+      <ion-note slot="end">{{ outsideToggle.value }}</ion-note>
     </ion-item>
   </ion-list>
   <p>

packages/angular/test/base/src/app/form/form.component.ts

@@ -18,6 +18,8 @@ export class FormComponent {
       toggle: [false],
       input: ['', Validators.required],
       input2: ['Default Value'],
+      inputMin: [1, Validators.min(1)],
+      inputMax: [1, Validators.max(1)],
       checkbox: [false]
     }, {
       updateOn: typeof (window as any) !== 'undefined' && window.location.hash === '#blur' ? 'blur' : 'change'