feat(input, textarea): dir is inherited to native form control (#30102)

Issue number: resolves #30193 resolves #29577

Co-authored-by: Maria Hutt <thetaPC@users.noreply.github.com>

core/src/components/input/input.tsx

@@ -338,10 +338,26 @@ export class Input implements ComponentInterface {
     }
   }
 
+  /**
+   * dir is a globally enumerated attribute.
+   * As a result, creating these as properties
+   * can have unintended side effects. Instead, we
+   * listen for attribute changes and inherit them
+   * to the inner `<input>` element.
+   */
+  @Watch('dir')
+  onDirChanged(newValue: string) {
+    this.inheritedAttributes = {
+      ...this.inheritedAttributes,
+      dir: newValue,
+    };
+    forceUpdate(this);
+  }
+
   componentWillLoad() {
     this.inheritedAttributes = {
       ...inheritAriaAttributes(this.el),
-      ...inheritAttributes(this.el, ['tabindex', 'title', 'data-form-type']),
+      ...inheritAttributes(this.el, ['tabindex', 'title', 'data-form-type', 'dir']),
     };
   }
 

core/src/components/input/test/input.spec.ts

@@ -44,6 +44,24 @@ describe('input: rendering', () => {
     const bottomContent = page.body.querySelector('ion-input .input-bottom');
     expect(bottomContent).toBe(null);
   });
+
+  it('should inherit watched attributes', async () => {
+    const page = await newSpecPage({
+      components: [Input],
+      html: '<ion-input label="Input" dir="ltr"></ion-input>',
+    });
+
+    const inputEl = page.body.querySelector('ion-input')!;
+    const nativeEl = inputEl.querySelector('input')!;
+
+    expect(nativeEl.getAttribute('dir')).toBe('ltr');
+
+    inputEl.setAttribute('dir', 'rtl');
+
+    await page.waitForChanges();
+
+    expect(nativeEl.getAttribute('dir')).toBe('rtl');
+  });
 });
 
 /**

core/src/components/textarea/test/textarea.spec.ts

@@ -14,6 +14,24 @@ it('should inherit attributes', async () => {
   expect(nativeEl.getAttribute('data-form-type')).toBe('password');
 });
 
+it('should inherit watched attributes', async () => {
+  const page = await newSpecPage({
+    components: [Textarea],
+    html: '<ion-textarea dir="ltr"></ion-textarea>',
+  });
+
+  const textareaEl = page.body.querySelector('ion-textarea')!;
+  const nativeEl = textareaEl.querySelector('textarea')!;
+
+  expect(nativeEl.getAttribute('dir')).toBe('ltr');
+
+  textareaEl.setAttribute('dir', 'rtl');
+
+  await page.waitForChanges();
+
+  expect(nativeEl.getAttribute('dir')).toBe('rtl');
+});
+
 /**
  * Textarea uses emulated slots, so the internal
  * behavior will not exactly match IonSelect's slots.

core/src/components/textarea/textarea.tsx

@@ -261,6 +261,22 @@ export class Textarea implements ComponentInterface {
     this.runAutoGrow();
   }
 
+  /**
+   * dir is a globally enumerated attribute.
+   * As a result, creating these as properties
+   * can have unintended side effects. Instead, we
+   * listen for attribute changes and inherit them
+   * to the inner `<textarea>` element.
+   */
+  @Watch('dir')
+  onDirChanged(newValue: string) {
+    this.inheritedAttributes = {
+      ...this.inheritedAttributes,
+      dir: newValue,
+    };
+    forceUpdate(this);
+  }
+
   /**
    * The `ionChange` event is fired when the user modifies the textarea's value.
    * Unlike the `ionInput` event, the `ionChange` event is fired when
@@ -331,7 +347,7 @@ export class Textarea implements ComponentInterface {
   componentWillLoad() {
     this.inheritedAttributes = {
       ...inheritAriaAttributes(this.el),
-      ...inheritAttributes(this.el, ['data-form-type', 'title', 'tabindex']),
+      ...inheritAttributes(this.el, ['data-form-type', 'title', 'tabindex', 'dir']),
     };
   }