add docs

apps/nspanel-lovelace-ui/luibackend/pages.py

@@ -631,15 +631,20 @@ class LuiPagesGen(object):
     def generate_power_page(self, navigation, heading, items):
         command = f"entityUpd~{heading}~{navigation}"
         for item in items:
-            entity = apis.ha_api.get_entity(item.entityId)
-            icon_color = self.get_entity_color(entity, overwrite=item.colorOverride)
-            icon = get_icon_ha(item.entityId, overwrite=item.iconOverride)
-            speed = 0
-            if float(entity.state) > 0:
-                speed = str(item.entity_input_config.get("speed", 1))
-                speed = apis.ha_api.render_template(speed)
-            unit = get_attr_safe(entity, "unit_of_measurement", "")
-            command += f"~{icon_color}~{icon}~{speed}~{entity.state} {unit}"
+            if apis.ha_api.entity_exists(item.entityId):
+                entity = apis.ha_api.get_entity(item.entityId)
+                icon_color = self.get_entity_color(entity, overwrite=item.colorOverride)
+                icon = get_icon_ha(item.entityId, overwrite=item.iconOverride)
+                speed = 0
+                if float(entity.state) > 0:
+                    speed = str(item.entity_input_config.get("speed", 1))
+                    speed = apis.ha_api.render_template(speed)
+                unit = get_attr_safe(entity, "unit_of_measurement", "")
+                command += f"~{icon_color}~{icon}~{speed}~{entity.state} {unit}"
+            elif item.entityId == "delete":
+                command += f"~~~~"
+            else:
+                command += f"~17299~{get_icon_id('mdi:alert-circle-outline')}~~"
         self._send_mqtt_msg(command)
 
     def render_card(self, card, send_page_type=True):

docs/card-power.md

@@ -0,0 +1,51 @@
+# Power Card (v3.9 and higher)
+
+![card-power](img/card-power.png)
+
+```yaml
+    cards:
+      - type: cardPower
+        title: Power Test
+        entities:
+          - entity: sensor.today_energy
+          - entity: delete
+          - entity: sensor.today_energy
+            speed: 3
+          - entity: sensor.today_energy
+            speed: -1
+          - entity: sensor.today_energy
+            speed: -2
+          - entity: sensor.today_energy
+            speed: -3
+          - entity: sensor.today_energy
+            speed: 1
+          - entity: sensor.today_energy
+            speed: 1
+```
+
+The first two entities are shown in the middle of the card, all other entities are used around it.
+
+List of supported config keys of this card:
+
+key | optional | type | default | description
+-- | -- | -- | -- | --
+`type` | False | string | `None` | Used by navigate items
+`entities` | False | complex | `None` | contains entities of the card
+`title` | True | string | `None` | Title of the Page 
+`key` | True | string | `None` | Used by navigate items
+
+List of supported entitiy types for this page:
+
+- sensor
+
+Some details about speed:
+
+It is possible to calculate the speed though home assistant templates, this allows to link the speed to something within your homeassistant.
+
+If you got a proper configuration for that, feel free to share it, would be a good addition to the documentation.
+
+```
+          - entity: sensor.today_energy
+            speed: '{{ range(-3, 3) | random }}'
+```
+