docs: fix vue example

examples/nuxt-example/components/ui/chart/ChartSingleTooltip.vue

@@ -0,0 +1,63 @@
+<script setup lang="ts">
+import { VisTooltip } from '@unovis/vue'
+import type { BulletLegendItemInterface } from '@unovis/ts'
+import { omit } from '@unovis/ts'
+import { type Component, createApp } from 'vue'
+import { ChartTooltip } from '.'
+
+const props = withDefaults(defineProps<{
+  selector: string
+  index: string
+  items?: BulletLegendItemInterface[]
+  valueFormatter?: (tick: number, i?: number, ticks?: number[]) => string
+  customTooltip?: Component
+}>(), {
+  valueFormatter: (tick: number) => `${tick}`,
+})
+
+// Use weakmap to store reference to each datapoint for Tooltip
+const wm = new WeakMap()
+function template(d: any, i: number, elements: (HTMLElement | SVGElement)[]) {
+  if (props.index in d) {
+    if (wm.has(d)) {
+      return wm.get(d)
+    }
+    else {
+      const componentDiv = document.createElement('div')
+      const omittedData = Object.entries(omit(d, [props.index])).map(([key, value]) => {
+        const legendReference = props.items?.find(i => i.name === key)
+        return { ...legendReference, value: props.valueFormatter(value) }
+      })
+      const TooltipComponent = props.customTooltip ?? ChartTooltip
+      createApp(TooltipComponent, { title: d[props.index], data: omittedData }).mount(componentDiv)
+      wm.set(d, componentDiv.innerHTML)
+      return componentDiv.innerHTML
+    }
+  }
+
+  else {
+    const data = d.data
+
+    if (wm.has(data)) {
+      return wm.get(data)
+    }
+    else {
+      const style = getComputedStyle(elements[i])
+      const omittedData = [{ name: data.name, value: props.valueFormatter(data[props.index]), color: style.fill }]
+      const componentDiv = document.createElement('div')
+      const TooltipComponent = props.customTooltip ?? ChartTooltip
+      createApp(TooltipComponent, { title: d[props.index], data: omittedData }).mount(componentDiv)
+      wm.set(d, componentDiv.innerHTML)
+      return componentDiv.innerHTML
+    }
+  }
+}
+</script>
+
+<template>
+  <VisTooltip
+    :horizontal-shift="20" :vertical-shift="20" :triggers="{
+      [selector]: template,
+    }"
+  />
+</template>