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uiserver/src/components/Chart.js

@@ -113,9 +113,12 @@ export default class Chart extends Component {
         this.state = {
             data: [],
             loading: true,
-            hiddenSeries: {} // { seriesId: true/false }
+            hiddenSeries: {}, // { seriesId: true/false }
+            lastValues: {}, // { channelId: lastValue } - for detecting changes
+            flashStates: {} // { channelId: 'up' | 'down' | null } - for flash animation
         };
         this.interval = null;
+        this.flashTimeouts = {}; // Store timeouts to clear flash states
     }
 
     componentDidMount() {
@@ -156,6 +159,8 @@ export default class Chart extends Component {
         if (this.interval) {
             clearInterval(this.interval);
         }
+        // Clear any pending flash timeouts
+        Object.values(this.flashTimeouts).forEach(timeout => clearTimeout(timeout));
     }
 
     getEffectiveChannels(props) {
@@ -189,6 +194,16 @@ export default class Chart extends Component {
         fetch(`/api/readings?selection=${encodeURIComponent(selectionStr)}&since=${since}&until=${until}`)
             .then(res => res.json())
             .then(dataObj => {
+                // Safety check: ensure dataObj is a valid object
+                if (!dataObj || typeof dataObj !== 'object') {
+                    console.error('Invalid data received from API:', dataObj);
+                    this.setState({ data: [], loading: false });
+                    return;
+                }
+
+                // Recalculate effective channels inside callback (closure fix)
+                const channelList = this.getEffectiveChannels(this.props);
+
                 // 1. Parse raw rows into intervals per channel
                 const intervals = [];
                 const timestampsSet = new Set();
@@ -196,7 +211,10 @@ export default class Chart extends Component {
                 // dataObj format: { "device:channel": [ [timestamp, value, until], ... ] }
                 Object.entries(dataObj).forEach(([id, points]) => {
                     // Check if this ID is in our effective/requested list
-                    if (!effectiveChannels.includes(id)) return;
+                    if (!channelList || !channelList.includes(id)) return;
+
+                    // Skip if points is not a valid array
+                    if (!Array.isArray(points)) return;
 
                     // Ensure sorted by time
                     points.sort((a, b) => new Date(a[0]) - new Date(b[0]));
@@ -274,6 +292,12 @@ export default class Chart extends Component {
                             row[inv.id] = inv.val;
                         }
                     });
+                    // Ensure all channel values are numbers or null (MUI-X requirement)
+                    channelList.forEach(ch => {
+                        if (row[ch] !== null && (typeof row[ch] !== 'number' || !Number.isFinite(row[ch]))) {
+                            row[ch] = null;
+                        }
+                    });
                     return row;
                 });
 
@@ -289,7 +313,45 @@ export default class Chart extends Component {
                     });
                 }
 
-                this.setState({ data: processedData, loading: false });
+                // 5. Detect value changes for flash animation
+                const effectiveChannels = this.getEffectiveChannels(this.props);
+                const newLastValues = {};
+                const newFlashStates = { ...this.state.flashStates };
+
+                // Get latest value for each channel (last row)
+                if (processedData.length > 0) {
+                    const lastRow = processedData[processedData.length - 1];
+                    effectiveChannels.forEach(channelId => {
+                        const newVal = lastRow[channelId];
+                        if (newVal !== null && newVal !== undefined) {
+                            newLastValues[channelId] = newVal;
+                            const oldVal = this.state.lastValues[channelId];
+
+                            // Only flash if we had a previous value and it changed
+                            if (oldVal !== undefined && oldVal !== newVal) {
+                                const direction = newVal > oldVal ? 'up' : 'down';
+                                newFlashStates[channelId] = direction;
+
+                                // Clear flash after 1 second
+                                if (this.flashTimeouts[channelId]) {
+                                    clearTimeout(this.flashTimeouts[channelId]);
+                                }
+                                this.flashTimeouts[channelId] = setTimeout(() => {
+                                    this.setState(prev => ({
+                                        flashStates: { ...prev.flashStates, [channelId]: null }
+                                    }));
+                                }, 1000);
+                            }
+                        }
+                    });
+                }
+
+                this.setState({
+                    data: processedData,
+                    loading: false,
+                    lastValues: newLastValues,
+                    flashStates: newFlashStates
+                });
             })
             .catch(err => {
                 console.error(err);
@@ -350,7 +412,7 @@ export default class Chart extends Component {
     };
 
     render() {
-        const { loading, data, hiddenSeries } = this.state;
+        const { loading, data, hiddenSeries, flashStates } = this.state;
         const { channelConfig, windowEnd, range } = this.props;
         const effectiveChannels = this.getEffectiveChannels(this.props);
 
@@ -456,7 +518,10 @@ export default class Chart extends Component {
                 <Paper sx={{ p: 2, flexGrow: 1, display: 'flex', flexDirection: 'column', minHeight: 0, overflow: 'hidden' }}>
                     {/* Custom Interactive Legend */}
                     <Box sx={{ display: 'flex', flexWrap: 'wrap', gap: 1.5, justifyContent: 'center', mb: 1, py: 0.5 }}>
-                        {legendItems.map(item => (
+                        {legendItems.map(item => {
+                            const flash = flashStates[item.id];
+                            const flashColor = flash === 'up' ? 'rgba(76, 175, 80, 0.4)' : flash === 'down' ? 'rgba(244, 67, 54, 0.4)' : 'transparent';
+                            return (
                                 <Box
                                     key={item.id}
                                     onClick={() => this.toggleSeries(item.id)}
@@ -467,8 +532,11 @@ export default class Chart extends Component {
                                         cursor: 'pointer',
                                         opacity: item.hidden ? 0.4 : 1,
                                         textDecoration: item.hidden ? 'line-through' : 'none',
-                                    transition: 'opacity 0.2s',
+                                        transition: 'opacity 0.2s, background-color 0.3s',
                                         userSelect: 'none',
+                                        backgroundColor: flashColor,
+                                        borderRadius: 1,
+                                        px: 0.5,
                                         '&:hover': { opacity: item.hidden ? 0.6 : 0.8 },
                                     }}
                                 >
@@ -486,7 +554,8 @@ export default class Chart extends Component {
                                         {item.label}
                                     </Typography>
                                 </Box>
-                        ))}
+                            );
+                        })}
                     </Box>
                     <Box sx={{ flexGrow: 1, width: '100%', height: '100%' }}>
                         <LineChart

uiserver/webpack.config.js

@@ -618,6 +618,9 @@ module.exports = {
         historyApiFallback: true,
         hot: true,
         allowedHosts: 'all',
+        client: {
+            webSocketURL: 'auto://0.0.0.0:0/ws',
+        },
         setupMiddlewares: (middlewares, devServer) => {
             if (!devServer) {
                 throw new Error('webpack-dev-server is not defined');