Config UI: dynamic default values, remove static HA instance default (#25525)

assets/js/components/Config/DeviceModal/DeviceModalBase.vue

@@ -700,8 +700,20 @@ export default defineComponent({
 			}
 			this.serviceValuesTimer = setTimeout(async () => {
 				this.serviceValues = await fetchServiceValues(this.templateParams, this.values);
+				this.applyServiceDefaults();
 			}, 500);
 		},
+		applyServiceDefaults() {
+			// Auto-apply single service values when field is empty and required
+			Object.keys(this.serviceValues).forEach((paramName) => {
+				const values = this.serviceValues[paramName];
+				const param = this.templateParams.find((p) => p.Name === paramName);
+				// Only auto-apply if exactly one value is returned, field is empty, and field is required
+				if (values?.length === 1 && !this.values[paramName] && param?.Required) {
+					this.values[paramName] = values[0];
+				}
+			});
+		},
 	},
 });
 </script>

assets/js/components/Config/DeviceModal/index.ts

@@ -117,7 +117,7 @@ export function customChargerName(type: ConfigType, isHeating: boolean) {
 export async function loadServiceValues(path: string) {
   try {
     const response = await api.get(`/config/service/${path}`);
-    return response.data as string[];
+    return (response.data as string[]) || [];
   } catch (e) {
     console.error(e);
     return [];

assets/js/components/Config/PropertyField.vue

@@ -89,7 +89,13 @@
 			:required="required"
 			:autocomplete="masked || datalistId ? 'off' : null"
 		/>
-		<button v-if="showClearButton" type="button" class="form-control-clear" @click="value = ''">
+		<button
+			v-if="showClearButton"
+			type="button"
+			class="form-control-clear"
+			:aria-label="$t('config.general.clear')"
+			@click="value = ''"
+		>
 			&times;
 		</button>
 		<datalist v-if="showDatalist" :id="datalistId">

cmd/setup.go

@@ -42,6 +42,7 @@ import (
 	"github.com/evcc-io/evcc/tariff"
 	"github.com/evcc-io/evcc/util"
 	"github.com/evcc-io/evcc/util/config"
+	_ "github.com/evcc-io/evcc/util/demo"
 	"github.com/evcc-io/evcc/util/locale"
 	"github.com/evcc-io/evcc/util/machine"
 	"github.com/evcc-io/evcc/util/request"

i18n/de.json

@@ -162,6 +162,7 @@
       "authPerformHint": "Öffnet ein neues Tab. Anschließend hier weiter machen.",
       "authPrepare": "Verbindung vorbereiten",
       "cancel": "Abbrechen",
+      "clear": "Löschen",
       "close": "Schließen",
       "customHelp": "Erstelle ein benutzerdefiniertes Gerät mit evcc's Plugin-System.",
       "customOption": "Benutzerdefiniertes Gerät",

i18n/en.json

@@ -162,6 +162,7 @@
       "authPerformHint": "Will open in a new tab. Return here to continue.",
       "authPrepare": "Prepare connection",
       "cancel": "Cancel",
+      "clear": "Clear",
       "close": "Close",
       "customHelp": "Create a user-defined device using evcc's plugin system.",
       "customOption": "User-defined device",

templates/definition/charger/homeassistant-switch.yaml

@@ -16,8 +16,8 @@ params:
     description:
       de: Home Assistant Instanz
       en: Home Assistant Instance
-    default: Home
     service: homeassistant/homes
+    required: true
   - name: switch
     description:
       de: Entity ID des schaltbaren Geräts

templates/definition/meter/homeassistant.yaml

@@ -4,8 +4,8 @@ products:
 group: generic
 requirements:
   description:
-    en: Requires a running Home Assistant instance with suitable sensor entities. All values are Home Assistant entity IDs (e.g. sensor.*)
-    de: Erfordert eine laufende Home Assistant Instanz mit passenden Sensor-Entitäten. Alle Werte sind Home Assistant Entity IDs (z.B. sensor.*)
+    en: Requires a running Home Assistant instance with suitable sensor entities. All values are Home Assistant entity IDs (e.g. `sensor.*`)
+    de: Erfordert eine laufende Home Assistant Instanz mit passenden Sensor-Entitäten. Alle Werte sind Home Assistant Entity IDs (z.B. `sensor.*`)
 auth:
   type: homeassistant
   params: [home]
@@ -20,7 +20,6 @@ params:
     description:
       de: Home Assistant Instanz
       en: Home Assistant Instance
-    default: Home
     service: homeassistant/homes
     required: true
   - name: power

templates/definition/vehicle/homeassistant.yaml

@@ -4,8 +4,8 @@ products:
 group: generic
 requirements:
   description:
-    en: Requires a running Home Assistant instance with suitable vehicle entities and services. All values are Home Assistant entity IDs (e.g. sensor.*, binary_sensor.*, number.*, script.*)
-    de: Erfordert eine laufende Home Assistant Instanz mit passenden Fahrzeug-Entities und Services. Alle Werte sind Home Assistant Entity IDs (z.B. sensor.*, binary_sensor.*, number.*, script.*)
+    en: Requires a running Home Assistant instance with suitable vehicle entities and services. All values are Home Assistant entity IDs (e.g. `sensor.*`, `binary_sensor.*`, `number.*`, `script.*`)
+    de: Erfordert eine laufende Home Assistant Instanz mit passenden Fahrzeug-Entities und Services. Alle Werte sind Home Assistant Entity IDs (z.B. `sensor.*`, `binary_sensor.*`, `number.*`, `script.*`)
 auth:
   type: homeassistant
   params: [home]
@@ -19,7 +19,6 @@ params:
     description:
       de: Home Assistant Instanz
       en: Home Assistant Instance
-    default: Home
     service: homeassistant/homes
     required: true
   - name: soc

tests/config-param-service-demo.tpl.yaml

@@ -0,0 +1,28 @@
+template: service-demo
+group: generic
+products:
+  - description:
+      generic: Service Demo Meter
+params:
+  - name: usage
+    choice: ["grid"]
+  - name: value
+    description:
+      generic: Important value
+    required: true
+    service: demo/single
+  - name: other-value
+    description:
+      generic: Other value
+    service: demo/single
+  - name: country
+    description:
+      generic: Country
+    service: demo/country
+  - name: city
+    description:
+      generic: City
+    service: demo/{country}/city
+
+render: |
+  type: custom

tests/config-param-service.spec.ts

@@ -0,0 +1,96 @@
+import { test, expect } from "@playwright/test";
+import type { Page } from "@playwright/test";
+import { start, stop, baseUrl } from "./evcc";
+import { enableExperimental, expectModalVisible, getDatalistOptions } from "./utils";
+
+test.use({ baseURL: baseUrl() });
+
+const templateFlags = [
+  "--disable-auth",
+  "--template-type",
+  "meter",
+  "--template",
+  "tests/config-param-service-demo.tpl.yaml",
+];
+
+test.beforeAll(async () => {
+  await start(undefined, undefined, templateFlags);
+});
+
+test.afterAll(async () => {
+  await stop();
+});
+
+async function openMeterModal(page: Page) {
+  await page.goto("/#/config");
+  await enableExperimental(page, true);
+  await page.getByRole("button", { name: "Add grid meter" }).click();
+  const meterModal = page.getByTestId("meter-modal");
+  await expectModalVisible(meterModal);
+  await meterModal.getByLabel("Manufacturer").selectOption("Service Demo Meter");
+  return meterModal;
+}
+
+test.describe("config param service", async () => {
+  test("autocomplete simple", async ({ page }) => {
+    const meterModal = await openMeterModal(page);
+    await expect(meterModal.getByLabel("Important value")).toHaveValue("demo-value");
+
+    const otherValue = meterModal.getByLabel("Other value");
+    await expect(await getDatalistOptions(otherValue)).toEqual(["demo-value"]);
+
+    const country = meterModal.getByLabel("Country");
+    await expect(await getDatalistOptions(country)).toEqual(["germany", "france", "spain"]);
+  });
+
+  test("autocomplete dependent", async ({ page }) => {
+    const meterModal = await openMeterModal(page);
+    await expect(meterModal.getByLabel("Important value")).toHaveValue("demo-value");
+
+    const country = meterModal.getByLabel("Country");
+    const city = meterModal.getByLabel("City");
+
+    // initially empty
+    await expect(await getDatalistOptions(city)).toEqual([]);
+
+    await country.fill("germany");
+    await expect(city).toHaveClass(/form-select/);
+    await expect(await getDatalistOptions(city)).toEqual(["berlin", "munich", "hamburg"]);
+
+    await country.fill("");
+    await expect(city).not.toHaveClass(/form-select/);
+    await expect(await getDatalistOptions(city)).toEqual([]);
+
+    await country.fill("france");
+    await expect(city).toHaveClass(/form-select/);
+    await expect(await getDatalistOptions(city)).toEqual(["paris", "lyon", "marseille"]);
+
+    await country.fill("fantasy");
+    await expect(city).not.toHaveClass(/form-select/);
+    await expect(await getDatalistOptions(city)).toEqual([]);
+  });
+
+  test("auto-apply single service value", async ({ page }) => {
+    const meterModal = await openMeterModal(page);
+
+    // only required single-value field is auto-populated
+    await expect(meterModal.getByLabel("Important value")).toHaveValue("demo-value");
+    await expect(meterModal.getByLabel("Other value")).toHaveValue("");
+    await expect(meterModal.getByLabel("Country")).toHaveValue("");
+    await expect(meterModal.getByLabel("City")).toHaveValue("");
+  });
+
+  test("clear button", async ({ page }) => {
+    const meterModal = await openMeterModal(page);
+    const valueField = meterModal.getByLabel("Important value");
+    await expect(valueField).toHaveValue("demo-value");
+
+    const clearButton = valueField.locator("..").getByLabel("Clear");
+    await expect(clearButton).toBeVisible();
+
+    // click clear button and verify it disappears and field is cleared
+    await clearButton.click();
+    await expect(clearButton).not.toBeVisible();
+    await expect(valueField).toHaveValue("");
+  });
+});

tests/utils.ts

@@ -146,3 +146,12 @@ export async function dragElement(
     await page.mouse.up();
   }
 }
+
+export async function getDatalistOptions(input: Locator): Promise<string[]> {
+  return input.evaluate((element: HTMLInputElement) => {
+    const datalistId = element.getAttribute("list");
+    if (!datalistId) return [];
+    const datalist = document.getElementById(datalistId);
+    return Array.from(datalist?.querySelectorAll("option") || []).map((opt) => opt.value);
+  });
+}

util/demo/service.go

@@ -0,0 +1,39 @@
+package demo
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/evcc-io/evcc/server/service"
+)
+
+func init() {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /single", getSingle)
+	mux.HandleFunc("GET /country", getCountry)
+	mux.HandleFunc("GET /{country}/city", getCity)
+
+	service.Register("demo", mux)
+}
+
+func getSingle(w http.ResponseWriter, req *http.Request) {
+	json.NewEncoder(w).Encode([]string{"demo-value"})
+}
+
+func getCountry(w http.ResponseWriter, req *http.Request) {
+	json.NewEncoder(w).Encode([]string{"germany", "france", "spain"})
+}
+
+func getCity(w http.ResponseWriter, req *http.Request) {
+	country := req.PathValue("country")
+	var cities []string
+	switch country {
+	case "germany":
+		cities = []string{"berlin", "munich", "hamburg"}
+	case "france":
+		cities = []string{"paris", "lyon", "marseille"}
+	case "spain":
+		cities = []string{"madrid", "barcelona", "valencia"}
+	}
+	json.NewEncoder(w).Encode(cities)
+}