fix: convert areachart to working barchart in trend-chart.svelte and fixed empty data issue (#930)

Co-authored-by: richarddkenneth <richard-kenneth@users.noreply.github.com>

packages/ui/src/base/chart/chart-tooltip.svelte

@@ -1,8 +1,8 @@
 <script lang="ts">
+  import { getChartContext, Tooltip as TooltipPrimitive } from 'layerchart';
   import { cn, type WithElementRef, type WithoutChildren } from '../../tools';
   import type { HTMLAttributes } from 'svelte/elements';
   import { getPayloadConfigFromPayload, useChart, type TooltipPayload } from './chart-utils';
-  import { getTooltipContext, Tooltip as TooltipPrimitive } from 'layerchart';
   import type { Snippet } from 'svelte';
 
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -48,27 +48,39 @@
   } = $props();
 
   const chart = useChart();
-  const tooltipCtx = getTooltipContext();
+  const chartCtx = getChartContext();
+
+  const visibleSeries = $derived(chartCtx.tooltip.series.filter((s) => s.value !== undefined));
 
   const formattedLabel = $derived.by(() => {
-    if (hideLabel || !tooltipCtx.payload?.length) return null;
+    if (hideLabel || !visibleSeries?.length) return null;
 
-    const [item] = tooltipCtx.payload;
-    const key = labelKey ?? item?.label ?? item?.name ?? 'value';
+    const [item] = visibleSeries;
+    const tooltipData = chartCtx.tooltip.data;
 
-    const itemConfig = getPayloadConfigFromPayload(chart.config, item, key);
+    const dataLabel = tooltipData != null ? chartCtx.x(tooltipData) : undefined;
 
-    const value =
-      !labelKey && typeof label === 'string'
-        ? (chart.config[label as keyof typeof chart.config]?.label ?? label)
-        : (itemConfig?.label ?? item.label);
+    const key = labelKey ?? item?.label ?? 'value';
+
+    let value: unknown;
+    if (!labelKey && typeof label === 'string') {
+      value = chart.config[label as keyof typeof chart.config]?.label ?? label;
+    } else {
+      const itemConfig = getPayloadConfigFromPayload(
+        chart.config,
+        item,
+        key,
+        tooltipData as Record<string, unknown> | null
+      );
+      value = itemConfig?.label ?? dataLabel;
+    }
 
     if (value === undefined) return null;
     if (!labelFormatter) return value;
-    return labelFormatter(value, tooltipCtx.payload);
+    return labelFormatter(value, visibleSeries);
   });
 
-  const nestLabel = $derived(tooltipCtx.payload.length === 1 && indicator !== 'dot');
+  const nestLabel = $derived(visibleSeries.length === 1 && indicator !== 'dot');
 </script>
 
 {#snippet TooltipLabel()}
@@ -85,6 +97,7 @@
 
 <TooltipPrimitive.Root variant="none">
   <div
+    bind:this={ref}
     class={cn(
       'ui:border-border/50 ui:bg-background ui:grid ui:min-w-[9rem] ui:items-start ui:gap-1.5 ui:rounded-lg ui:border ui:px-2.5 ui:py-1.5 ui:text-xs ui:shadow-xl',
       className
@@ -95,23 +108,23 @@
       {@render TooltipLabel()}
     {/if}
     <div class="ui:grid ui:gap-1.5">
-      {#each tooltipCtx.payload as item, i (item.key + i)}
-        {@const key = `${nameKey || item.key || item.name || 'value'}`}
-        {@const itemConfig = getPayloadConfigFromPayload(chart.config, item, key)}
-        {@const indicatorColor = color || item.payload?.color || item.color}
+      {#each visibleSeries as item, i (item.key + i)}
+        {@const key = `${nameKey || item.key || item.label || 'value'}`}
+        {@const itemConfig = getPayloadConfigFromPayload(chart.config, item, key, chartCtx.tooltip.data)}
+        {@const indicatorColor = color || item.config?.color || item.color}
         <div
           class={cn(
             'ui:[&>svg]:text-muted-foreground ui:flex ui:w-full ui:flex-wrap ui:items-stretch ui:gap-2 ui:[&>svg]:size-2.5',
             indicator === 'dot' && 'ui:items-center'
           )}
         >
-          {#if formatter && item.value !== undefined && item.name}
+          {#if formatter && item.value !== undefined && item.label}
             {@render formatter({
               value: item.value,
-              name: item.name,
+              name: item.label,
               item,
               index: i,
-              payload: tooltipCtx.payload
+              payload: visibleSeries
             })}
           {:else}
             {#if itemConfig?.icon}
@@ -138,7 +151,7 @@
                   {@render TooltipLabel()}
                 {/if}
                 <span class="ui:text-muted-foreground">
-                  {itemConfig?.label || item.name}
+                  {itemConfig?.label || item.label}
                 </span>
               </div>
               {#if item.value !== undefined}

packages/ui/src/base/chart/chart-utils.ts

@@ -1,5 +1,5 @@
 import type { Tooltip } from 'layerchart';
-import { getContext, setContext, type Component, type ComponentProps, type Snippet } from 'svelte';
+import { getContext, setContext, type Snippet } from 'svelte';
 import type { ChartConfig } from './types';
 
 export type { ChartConfig } from './types';
@@ -14,31 +14,37 @@ export type ChartLegendItem = {
 
 export type ExtractSnippetParams<T> = T extends Snippet<[infer P]> ? P : never;
 
-export type TooltipPayload = ExtractSnippetParams<ComponentProps<typeof Tooltip.Root>['children']>['payload'][number];
+export type TooltipPayload = Tooltip.TooltipSeries;
 
 // Helper to extract item config from a payload.
-export function getPayloadConfigFromPayload(config: ChartConfig, payload: TooltipPayload, key: string) {
+export function getPayloadConfigFromPayload(
+  config: ChartConfig,
+  payload: TooltipPayload,
+  key: string,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  data?: Record<string, any> | null
+) {
   if (typeof payload !== 'object' || payload === null) return undefined;
 
-  const payloadPayload =
-    'payload' in payload && typeof payload.payload === 'object' && payload.payload !== null
-      ? payload.payload
-      : undefined;
+  const payloadConfig =
+    'config' in payload && typeof payload.config === 'object' && payload.config !== null ? payload.config : undefined;
 
   let configLabelKey: string = key;
 
   if (payload.key === key) {
     configLabelKey = payload.key;
-  } else if (payload.name === key) {
-    configLabelKey = payload.name;
+  } else if (payload.label === key) {
+    configLabelKey = payload.label;
   } else if (key in payload && typeof payload[key as keyof typeof payload] === 'string') {
     configLabelKey = payload[key as keyof typeof payload] as string;
   } else if (
-    payloadPayload !== undefined &&
-    key in payloadPayload &&
-    typeof payloadPayload[key as keyof typeof payloadPayload] === 'string'
+    payloadConfig !== undefined &&
+    key in payloadConfig &&
+    typeof payloadConfig[key as keyof typeof payloadConfig] === 'string'
   ) {
-    configLabelKey = payloadPayload[key as keyof typeof payloadPayload] as string;
+    configLabelKey = payloadConfig[key as keyof typeof payloadConfig] as string;
+  } else if (data != null && key in data && typeof data[key] === 'string') {
+    configLabelKey = data[key] as string;
   }
 
   return configLabelKey in config ? config[configLabelKey] : config[key as keyof typeof config];