fix(text-area): autoresize (#2720)

Author: bennypowers

.changeset/empty-ties-heal.md

@@ -0,0 +1,4 @@
+---
+"@patternfly/elements": patch
+---
+`<pf-text-area>`: auto-resize attribute now works as expected

elements/pf-text-area/pf-text-area.ts

@@ -144,7 +144,7 @@ export class PfTextArea extends LitElement {
 
   static readonly formAssociated = true;
 
-  static override shadowRootOptions: ShadowRootInit = { ...LitElement.shadowRootOptions, delegatesFocus: true };
+  static override readonly shadowRootOptions = { ...LitElement.shadowRootOptions, delegatesFocus: true };
 
   /** Accessible label for the input when no `<label>` element is provided. */
   @property({ reflect: true, attribute: 'accessible-label' }) accessibleLabel?: string;
@@ -160,7 +160,7 @@ export class PfTextArea extends LitElement {
   /** Flag to show if the input is disabled. */
   @property({ type: Boolean, reflect: true }) disabled = false;
 
-  /** Flag to show if the input is required. */
+  /** Flag to show if the text area is required. */
   @property({ type: Boolean, reflect: true }) required = false;
 
   /** Flag to show if the input is read only. */
@@ -175,9 +175,11 @@ export class PfTextArea extends LitElement {
   /** Sets the orientation to limit the resize to */
   @property() resize?: 'horizontal' | 'vertical' | 'both';
 
-  /** Sets the orientation to limit the resize to */
+  /** Flag to modify height based on contents. */
   @property({ type: Boolean, attribute: 'auto-resize' }) autoResize = false;
 
+  #style?: CSSStyleDeclaration;
+
   #logger = new Logger(this);
 
   #internals = InternalsController.of(this);
@@ -198,6 +200,7 @@ export class PfTextArea extends LitElement {
     return html`
       <textarea id="textarea" class="${classMap(classes)}"
                 @input="${this.#onInput}"
+                @change="${this.#onInput}"
                 ?disabled="${this.matches(':disabled') || this.disabled}"
                 ?readonly="${this.readonly}"
                 ?required="${this.required}"
@@ -208,12 +211,26 @@ export class PfTextArea extends LitElement {
     `;
   }
 
+  override firstUpdated(): void {
+    if (this.autoResize) {
+      this.#autoSetHeight();
+    }
+  }
+
   #onInput(event: Event) {
     if (event.target instanceof HTMLTextAreaElement) {
       const { value } = event.target;
       this.value = value;
       this.#internals.setFormValue(value);
     }
+    if (this.autoResize) {
+      this.#autoSetHeight();
+    }
+  }
+
+  #autoSetHeight() {
+    this.#input.style.setProperty('--pf-c-form-control--textarea--Height', `auto`);
+    this.#input.style.setProperty('--pf-c-form-control--textarea--Height', `${this.#input.scrollHeight}px`);
   }
 
   #setValidityFromInput() {