B4L/Northern-Thailand-Ping-River-Monitor
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fix: fix chart reuse error and harden flood-bands plugin

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This commit is contained in:
grabowski
2026-08-09 17:56:30 +07:00
parent ba0348b580
commit b3ea340bbd
1 changed files with 9 additions and 9 deletions
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src/static/dashboard.html
+9 -9
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@@ -320,6 +320,7 @@
state.selectedStation = stationCode;
$('history-title').textContent = `${stationCode} · PostgreSQL history`;
$('history-status').textContent = 'Loading historical measurements…';
if (state.historyChart) { state.historyChart.destroy(); state.historyChart = null; }
try {
const response = await fetch(`/measurements/history/${encodeURIComponent(stationCode)}?hours=${$('history-range').value}`);
if (!response.ok) throw new Error((await response.json()).detail || `HTTP ${response.status}`);
@@ -345,8 +346,6 @@
};
const sampled = rows.length > 2000 ? downsample(rows) : rows;
if (state.historyChart) state.historyChart.destroy();
state.historyChart = new Chart($('history-chart'), {
type: 'line',
data: {
@@ -366,18 +365,19 @@
},
plugins: [{
id: 'flood-bands',
beforeDraw(chart) {
const { ctx, scales, chartArea } = chart;
const levelScale = scales.level;
beforeDraw(chart, _args, options) {
const levelScale = chart.scales?.level;
if (!levelScale || levelScale.min == null) return;
const zones = [
{ min: levelScale.min, max: 3.0, color: 'rgba(30,139,96,.08)' }, // normal
{ min: 3.0, max: 4.5, color: 'rgba(217,144,24,.12)' }, // warning
{ min: 4.5, max: levelScale.max, color: 'rgba(204,75,55,.15)' }, // danger
{ min: levelScale.min, max: 3.0, color: 'rgba(30,139,96,.08)' },
{ min: 3.0, max: 4.5, color: 'rgba(217,144,24,.12)' },
{ min: 4.5, max: levelScale.max, color: 'rgba(204,75,55,.15)' },
];
zones.forEach((z) => {
const top = levelScale.getPixelForValue(Math.min(z.max, levelScale.max));
const bottom = levelScale.getPixelForValue(Math.max(z.min, levelScale.min));
if (top < bottom) {
if (bottom > top) {
const { ctx, chartArea } = chart;
ctx.save();
ctx.fillStyle = z.color;
ctx.fillRect(chartArea.left, top, chartArea.right - chartArea.left, bottom - top);