Add support for error state

Author: timmo001

src/components/ha-generic-picker.ts

@@ -103,6 +103,10 @@ export class HaGenericPicker extends LitElement {
   // helper to set new value after closing picker, to avoid flicker
   private _newValue?: string;
 
+  @property({ attribute: "error-message" }) public errorMessage?: string;
+
+  @property({ type: Boolean, reflect: true }) public invalid = false;
+
   private _unsubscribeTinyKeys?: () => void;
 
   protected render() {
@@ -137,6 +141,8 @@ export class HaGenericPicker extends LitElement {
                   .value=${this.value}
                   .required=${this.required}
                   .disabled=${this.disabled}
+                  .errorMessage=${this.errorMessage}
+                  .invalid=${this.invalid}
                   .hideClearIcon=${this.hideClearIcon}
                   .valueRenderer=${this.valueRenderer}
                 >
@@ -205,11 +211,16 @@ export class HaGenericPicker extends LitElement {
   }
 
   private _renderHelper() {
-    return this.helper
-      ? html`<ha-input-helper-text .disabled=${this.disabled}
-          >${this.helper}</ha-input-helper-text
-        >`
-      : nothing;
+    const showError = this.invalid && this.errorMessage;
+    const showHelper = !showError && this.helper;
+
+    if (!showError && !showHelper) {
+      return nothing;
+    }
+
+    return html`<ha-input-helper-text .disabled=${this.disabled}>
+      ${showError ? this.errorMessage : this.helper}
+    </ha-input-helper-text>`;
   }
 
   private _dialogOpened = () => {
@@ -308,6 +319,9 @@ export class HaGenericPicker extends LitElement {
           display: block;
           margin: var(--ha-space-2) 0 0;
         }
+        :host([invalid]) ha-input-helper-text {
+          color: var(--mdc-theme-error, var(--error-color, #b00020));
+        }
 
         wa-popover {
           --wa-space-l: var(--ha-space-0);

src/components/ha-icon-picker.ts

@@ -108,6 +108,8 @@ export class HaIconPicker extends LitElement {
         .disabled=${this.disabled}
         .required=${this.required}
         .placeholder=${this.placeholder}
+        .errorMessage=${this.errorMessage}
+        .invalid=${this.invalid}
         .rowRenderer=${rowRenderer}
         .valueRenderer=${valueRenderer}
         .searchFn=${this._filterIcons}

src/components/ha-picker-field.ts

@@ -39,6 +39,10 @@ export class HaPickerField extends LitElement {
   @property({ attribute: false })
   public valueRenderer?: PickerValueRenderer;
 
+  @property({ attribute: "error-message" }) public errorMessage?: string;
+
+  @property({ type: Boolean, reflect: true }) public invalid = false;
+
   @query("ha-combo-box-item", true) public item!: HaComboBoxItem;
 
   public async focus() {
@@ -142,6 +146,11 @@ export class HaPickerField extends LitElement {
           background-color: var(--mdc-theme-primary);
         }
 
+        :host([invalid]) ha-combo-box-item:after {
+          height: 2px;
+          background-color: var(--mdc-theme-error, var(--error-color, #b00020));
+        }
+
         .clear {
           margin: 0 -8px;
           --mdc-icon-button-size: 32px;