Add helpers to all selectors (#12230)

src/components/ha-selector/ha-selector-datetime.ts

@@ -6,6 +6,7 @@ import type { HomeAssistant } from "../../types";
 import "../ha-date-input";
 import type { HaDateInput } from "../ha-date-input";
 import "../ha-time-input";
+import "../ha-input-helper-text";
 import type { HaTimeInput } from "../ha-time-input";
 
 @customElement("ha-selector-datetime")
@@ -18,6 +19,8 @@ export class HaDateTimeSelector extends LitElement {
 
   @property() public label?: string;
 
+  @property() public helper?: string;
+
   @property({ type: Boolean, reflect: true }) public disabled = false;
 
   @property({ type: Boolean }) public required = true;
@@ -30,23 +33,28 @@ export class HaDateTimeSelector extends LitElement {
     const values = this.value?.split(" ");
 
     return html`
-      <ha-date-input
-        .label=${this.label}
-        .locale=${this.hass.locale}
-        .disabled=${this.disabled}
-        .required=${this.required}
-        .value=${values?.[0]}
-        @value-changed=${this._valueChanged}
-      >
-      </ha-date-input>
-      <ha-time-input
-        enable-second
-        .value=${values?.[1] || "0:00:00"}
-        .locale=${this.hass.locale}
-        .disabled=${this.disabled}
-        .required=${this.required}
-        @value-changed=${this._valueChanged}
-      ></ha-time-input>
+      <div class="input">
+        <ha-date-input
+          .label=${this.label}
+          .locale=${this.hass.locale}
+          .disabled=${this.disabled}
+          .required=${this.required}
+          .value=${values?.[0]}
+          @value-changed=${this._valueChanged}
+        >
+        </ha-date-input>
+        <ha-time-input
+          enable-second
+          .value=${values?.[1] || "0:00:00"}
+          .locale=${this.hass.locale}
+          .disabled=${this.disabled}
+          .required=${this.required}
+          @value-changed=${this._valueChanged}
+        ></ha-time-input>
+      </div>
+      ${this.helper
+        ? html`<ha-input-helper-text>${this.helper}</ha-input-helper-text>`
+        : ""}
     `;
   }
 
@@ -58,7 +66,7 @@ export class HaDateTimeSelector extends LitElement {
   }
 
   static styles = css`
-    :host {
+    .input {
       display: flex;
       align-items: center;
       flex-direction: row;