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<script lang="ts">
import { onMount, onDestroy } from 'svelte';
import type * as echartsNS from 'echarts';
interface Props {
option: echartsNS.EChartsOption;
height?: number;
ariaLabel?: string;
}
let { option, height = 360, ariaLabel = '图表' }: Props = $props();
let host: HTMLDivElement;
let chart: echartsNS.ECharts | null = null;
let observer: ResizeObserver | null = null;
onMount(async () => {
// ECharts chunk loads lazily when a result/comparison view is opened.
const echarts = (await import('echarts')) as typeof echartsNS;
if (!host) return;
// Pass explicit sizes when the host has no layout yet (jsdom regression
// tests report 0×0 and ECharts warns "Can't get DOM width or height").
// In a real browser clientWidth/clientHeight are non-zero, so the measured
// size is used exactly as before; responsive resizing still works through
// the ResizeObserver below.
chart = echarts.init(host, undefined, {
renderer: 'svg',
width: host.clientWidth || 640,
height: host.clientHeight || height
});
observer = new ResizeObserver(() => {
if (!chart) return;
// re-measure on EVERY resize callback and pass the measured size
// explicitly: echarts keeps the width given at init/resize, so a
// desktop->mobile viewport change would otherwise leave the SVG at the
// old width and overflow the page (real, re-verified live bug).
const w = host.clientWidth || undefined;
const h = host.clientHeight || undefined;
if (w === undefined && h === undefined) return;
chart.resize({ width: w, height: h });
});
observer.observe(host);
chart?.setOption(option, { notMerge: true });
});
onDestroy(() => {
observer?.disconnect();
chart?.dispose();
chart = null;
});
$effect(() => {
chart?.setOption(option, { notMerge: true });
});
</script>
<div
bind:this={host}
style="height:{height}px; width:100%; min-width:0;"
role="img"
aria-label={ariaLabel}
></div>
<style>
div {
display: block;
}
</style>
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