Allow selecting multiple entities

gallery/src/pages/components/ha-selector.ts

@@ -175,6 +175,12 @@ const SCHEMAS: {
       },
     },
   },
+  {
+    name: "Multiples",
+    input: {
+      entity: { name: "Entity", selector: { entity: { multiple: true } } },
+    },
+  },
 ];
 
 @customElement("demo-components-ha-selector")

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

@@ -1,6 +1,8 @@
 import { HassEntity, UnsubscribeFunc } from "home-assistant-js-websocket";
-import { html, LitElement } from "lit";
+import { css, html, LitElement } from "lit";
 import { customElement, property, state } from "lit/decorators";
+import { repeat } from "lit/directives/repeat";
+import { fireEvent } from "../../common/dom/fire_event";
 import { computeStateDomain } from "../../common/entity/compute_state_domain";
 import { subscribeEntityRegistry } from "../../data/entity_registry";
 import { EntitySelector } from "../../data/selector";
@@ -23,14 +25,45 @@ export class HaEntitySelector extends SubscribeMixin(LitElement) {
   @property({ type: Boolean }) public disabled = false;
 
   protected render() {
-    return html`<ha-entity-picker
-      .hass=${this.hass}
-      .value=${this.value}
-      .label=${this.label}
-      .entityFilter=${this._filterEntities}
-      .disabled=${this.disabled}
-      allow-custom-entity
-    ></ha-entity-picker>`;
+    if (!this.selector.entity.multiple) {
+      return html`<ha-entity-picker
+        .hass=${this.hass}
+        .value=${this.value}
+        .label=${this.label}
+        .entityFilter=${this._filterEntities}
+        .disabled=${this.disabled}
+        allow-custom-entity
+      ></ha-entity-picker>`;
+    }
+
+    // For multiple, the value is a list.
+    const value = this._normalizedValue as string[];
+
+    return html`
+      ${this.label ? html`<div>${this.label}</div>` : ""}
+      ${repeat(
+        value,
+        (val) => val,
+        (entityId, index) => html`
+          <ha-entity-picker
+            .hass=${this.hass}
+            .value=${entityId}
+            .entityFilter=${this._filterEntities}
+            .disabled=${this.disabled}
+            .index=${index}
+            allow-custom-entity
+            @value-changed=${this._valueChanged}
+          ></ha-entity-picker>
+        `
+      )}
+      <ha-entity-picker
+        .hass=${this.hass}
+        .entityFilter=${this._filterEntities}
+        .disabled=${this.disabled}
+        allow-custom-entity
+        @value-changed=${this._valueChanged}
+      ></ha-entity-picker>
+    `;
   }
 
   public hassSubscribe(): UnsubscribeFunc[] {
@@ -48,6 +81,17 @@ export class HaEntitySelector extends SubscribeMixin(LitElement) {
     ];
   }
 
+  private get _normalizedValue() {
+    if (!this.selector.entity.multiple) {
+      return this.value;
+    }
+
+    if (!this.value) {
+      return [];
+    }
+    return Array.isArray(this.value) ? this.value : [this.value];
+  }
+
   private _filterEntities = (entity: HassEntity): boolean => {
     if (this.selector.entity?.domain) {
       const filterDomain = this.selector.entity.domain;
@@ -79,6 +123,43 @@ export class HaEntitySelector extends SubscribeMixin(LitElement) {
     }
     return true;
   };
+
+  // this method is only used when multiple: true
+  private _valueChanged(ev: any) {
+    ev.stopPropagation();
+
+    // undefined = new value
+    const index = ev.target.index as number | undefined;
+    // undefined = remove
+    const newValue = ev.detail.value as string | undefined;
+
+    let updatedValue: string[] | undefined;
+
+    if (index === undefined) {
+      if (newValue) {
+        updatedValue = [...this._normalizedValue, newValue];
+      }
+      ev.target.value = "";
+    } else if (newValue) {
+      updatedValue = [...this._normalizedValue];
+      updatedValue[index] = newValue;
+    } else {
+      updatedValue = this._normalizedValue.filter((_, i) => i !== index);
+    }
+
+    if (updatedValue) {
+      fireEvent(this, "value-changed", {
+        value: updatedValue,
+      });
+    }
+  }
+
+  static styles = css`
+    ha-entity-picker + ha-entity-picker {
+      display: block;
+      margin-top: 16px;
+    }
+  `;
 }
 
 declare global {

src/data/selector.ts

@@ -23,6 +23,7 @@ export interface EntitySelector {
     integration?: string;
     domain?: string | string[];
     device_class?: string;
+    multiple?: boolean;
   };
 }