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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

manuals/node-red/flowfuse-ui-template-manual.md

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+# FlowFuse `ui-template` Manual (EVOLV Reference)
+
+Source: https://dashboard.flowfuse.com/nodes/widgets/ui-template.html
+
+## Purpose
+
+Custom Vue 3 / Vuetify / HTML widget. Full scripting, scoped CSS, send/receive messages.
+
+## Scopes
+
+| Scope | Renders | Use Case |
+|-------|---------|----------|
+| Widget (Group) | Inside a ui-group | Custom gauges, tables, controls |
+| Widget (Page) | On page, outside groups | Floating overlays, full-width banners |
+| Widget (UI) | On every page | Global headers, footers |
+| CSS (All Pages) | N/A — injects `<style>` | Global CSS overrides |
+| CSS (Single Page) | N/A — injects `<style>` | Page-specific CSS |
+
+## Properties
+
+| Property | Type | Dynamic | Notes |
+|----------|------|---------|-------|
+| `group` | ref | No | Parent ui-group (Group scope) |
+| `page` | ref | No | Parent ui-page (Page scope) |
+| `width` | int | No | Columns |
+| `height` | int | No | Row units |
+| `format` | string | Yes | Vue template string |
+| `storeOutMessages` | bool | No | Persist last output for late joiners |
+| `passthru` | bool | No | Forward input to output |
+| `templateScope` | string | No | `"widget:group"`, `"widget:page"`, `"widget:ui"`, `"page:style"`, `"site:style"` |
+
+## Template Structure
+
+```html
+<template>
+  <v-btn @click="send({payload: 'clicked'})">Click</v-btn>
+  <p>Value: {{ msg.payload }}</p>
+</template>
+<script>
+export default {
+  data() { return { local: 0 }; },
+  watch: {
+    msg(val) { this.local = val.payload; }
+  },
+  methods: {
+    doSend() { this.send({payload: this.local}); }
+  },
+  mounted() { /* one-time setup */ },
+  unmounted() { /* cleanup */ }
+};
+</script>
+<style scoped>
+p { color: #2196f3; }
+</style>
+```
+
+## Built-in Variables
+
+| Variable | Description |
+|----------|-------------|
+| `id` | This node's unique ID |
+| `msg` | Latest received message (reactive) |
+| `$socket` | Socket.io client for custom events |
+
+## Sending Messages
+
+```js
+this.send({ payload: 42, topic: "my-topic" });
+this.submit();  // sends FormData from <form>
+```
+
+## Receiving Messages
+
+**Option A** — Vue `watch`:
+```js
+watch: { msg(newMsg) { /* react */ } }
+```
+
+**Option B** — Socket listener:
+```js
+mounted() {
+  this.$socket.on('msg-input:' + this.id, (msg) => { /* handle */ });
+}
+```
+
+## Teleports (inject into dashboard chrome)
+
+```html
+<Teleport to="#app-bar-actions">
+  <v-btn>Custom Button</v-btn>
+</Teleport>
+```
+
+Targets: `#app-bar-title`, `#app-bar-actions`.
+
+## Vuetify Components
+
+All Vuetify 3 components are available without import: `<v-btn>`, `<v-card>`, `<v-slider>`, `<v-data-table>`, etc.
+
+## Dynamic Properties (`msg.ui_update`)
+
+```js
+msg.ui_update = { format: "<p>New template content</p>" };
+```
+
+## EVOLV Key Rules
+
+1. Use templates sparingly — prefer built-in widgets when they fit.
+2. For complex custom visualizations (SVG P&ID, animated schematics), template is the right choice.
+3. Always use `<style scoped>` to avoid leaking CSS to other widgets.
+4. Prefer `watch: { msg }` over socket listeners for simpler code.
+5. Keep templates under 100 lines — split complex UIs into multiple template nodes.