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

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

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+# FlowFuse `ui-chart` Manual (EVOLV Reference)
+
+Source: https://dashboard.flowfuse.com/nodes/widgets/ui-chart.html
+
+## Chart Types
+
+| Type | X-Axis Options | Notes |
+|------|---------------|-------|
+| Line | timescale, linear, categorical | Interpolation: linear, step, bezier, cubic, cubic-mono |
+| Bar | categorical | Grouped (side-by-side) or stacked |
+| Scatter | timescale, linear, categorical | Configurable point shape & radius |
+| Pie / Doughnut | radial | Nested series for multi-layer |
+| Histogram | auto-binned | Numerical bins or categorical counting |
+
+## Properties
+
+| Property | Type | Dynamic | Notes |
+|----------|------|---------|-------|
+| `group` | ref | No | Parent ui-group |
+| `width` | int | No | Columns |
+| `height` | int | No | Row units |
+| `label` | string | No | Chart title |
+| `chartType` | string | No | `"line"`, `"bar"`, `"scatter"`, `"pie"`, `"histogram"` |
+| `showLegend` | bool | No | Show series legend |
+| `action` | string | Yes | `"append"` or `"replace"` |
+| `pointShape` | string | No | Point marker shape (scatter/line) |
+| `xAxisLimit` | int | No | Max data points to keep |
+| `textColor` | color | No | Override text color |
+| `gridColor` | color | No | Override grid lines |
+| `xAxisType` | string | No | `"time"`, `"linear"`, `"category"` |
+
+## Series Configuration
+
+| Source | How It Works |
+|--------|-------------|
+| `msg.topic` | Default — each unique topic creates a series |
+| `key` | Uses a named property from data object |
+| `JSON` | Array of keys for multi-series from single msg |
+| (blank) | Auto-generates timestamp for x |
+
+## Input Format
+
+### Simple (recommended for EVOLV)
+```js
+{ topic: "PS West Level", payload: 2.34, timestamp: Date.now() }
+```
+
+### Object with x/y mapping
+```js
+{ payload: { time: 1700000000000, value: 2.34 } }
+// Configure x → "time", y → "value"
+```
+
+### Nested access
+X/Y keys support dot notation: `"nested.value"` → `payload.nested.value`
+
+## Dynamic Properties
+
+| Property | Path | Notes |
+|----------|------|-------|
+| Action | `msg.action` | `"append"` or `"replace"` |
+| Chart Options | `msg.ui_update.chartOptions` | eCharts config merge |
+| CSS Class | `msg.class` | Add custom class |
+
+## eCharts Customization (`msg.ui_update.chartOptions`)
+
+Deep-merges with existing config. Accumulates across messages.
+
+```js
+msg.ui_update = {
+  chartOptions: {
+    yAxis: { position: "right", name: "Level (m)" },
+    grid: { top: 60, right: 40 },
+    title: { text: "Basin Levels", textStyle: { fontSize: 14 } }
+  }
+};
+```
+
+**Series colors** — must provide all series configs together:
+```js
+msg.ui_update = {
+  chartOptions: {
+    series: [
+      { name: "PS West", type: "line", lineStyle: { color: "#2196f3" }, itemStyle: { color: "#2196f3" } },
+      { name: "PS North", type: "line", lineStyle: { color: "#ff9800" }, itemStyle: { color: "#ff9800" } }
+    ]
+  }
+};
+```
+
+## Data Actions
+
+| Action | How | Effect |
+|--------|-----|--------|
+| Append | `msg.action = "append"` (default) | Add points to existing data |
+| Replace | `msg.action = "replace"` | Clear then add |
+| Clear | `msg.payload = []` | Remove all data |
+
+## Time Formatting Tokens
+
+`{HH}:{mm}:{ss}` → `12:00:00`
+`{yyyy}-{M}-{d}` → `2020-1-1`
+Tokens: `{yyyy}`, `{MM}`, `{dd}`, `{HH}`, `{H}`, `{hh}`, `{h}`, `{mm}`, `{m}`, `{ss}`, `{s}`, `{eeee}` (day name)
+
+## EVOLV Key Rules
+
+1. Send minimal `{ topic, payload, timestamp }` — chart auto-uses topic for series.
+2. Set `category: "topic"`, `categoryType: "msg"` in node config — blank category causes editor validation errors.
+3. For timeseries: leave x-key blank → auto-timestamp. Supply ms timestamps if custom.
+4. For multi-station overlay charts: each station sends with a different `msg.topic`.
+5. Use `msg.action = "append"` (default) for streaming data; `"replace"` for snapshot updates.
+6. Keep one topic per chart for simple KPIs; use multi-topic for comparison views.
+7. Prefer explicit output-slot routing: `node.send([msgForChart, msgForText, ...]); return null;`
+
+## Common Failure Modes
+
+- Payload is not numeric (string/object without y-key config)
+- Function node returns to wrong output index
+- Topic churn creates unexpected series fragmentation
+- Chart has stale data policy mismatch (`append` vs `replace`)
+- Blank `category` field causes red node on deploy