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Footnote.tsx
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Footnote.tsx
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import { isNil, parseIntOrUndefined, Tippy } from "@ourworldindata/utils"
import React from "react"
import ReactDOM from "react-dom"
export const Footnote = ({
index,
htmlContent,
triggerTarget,
}: {
index: number
htmlContent?: string
triggerTarget?: Element
}) => {
const onEvent = (instance: any, event: Event) => {
if (event.type === "click") event.preventDefault()
}
return (
<Tippy
appendTo={() => document.body}
content={
htmlContent && (
<div>
<div
dangerouslySetInnerHTML={{
__html: htmlContent,
}}
/>
</div>
)
}
interactive
interactiveDebounce={50}
placement="bottom"
theme="owid-footnote"
trigger="mouseenter focus click"
triggerTarget={triggerTarget}
onTrigger={onEvent}
onUntrigger={onEvent}
>
<sup>{index}</sup>
</Tippy>
)
}
interface FootnoteContent {
index: number
href: string
htmlContent: string
}
function getFootnoteContent(element: Element): FootnoteContent | null {
const href = element.closest("a.ref")?.getAttribute("href")
if (!href) return null
const index = parseIntOrUndefined(href.split("-")[1])
if (index === undefined) return null
const referencedEl = document.querySelector(href)
if (!referencedEl?.innerHTML) return null
return { index, href, htmlContent: referencedEl.innerHTML }
}
export function runFootnotes() {
const footnotes = document.querySelectorAll("a.ref")
footnotes.forEach((f) => {
const footnoteContent = getFootnoteContent(f)
if (isNil(footnoteContent)) return
ReactDOM.hydrate(
<Footnote
index={footnoteContent.index}
htmlContent={footnoteContent.htmlContent}
triggerTarget={f}
/>,
f
)
})
}