quartz-research-note/assets/js/popover.js

function htmlToElement(html) {
    const template = document.createElement('template')
    html = html.trim()
    template.innerHTML = html
    return template.content.firstChild
}

function initPopover(base) {
    const baseUrl = base.replace(window.location.origin, "") // is this useless?
    document.addEventListener("DOMContentLoaded", () => {
        fetchData.then(({content}) => {
        const links = [...document.getElementsByClassName("internal-link")]
        links.forEach(li => {
            const linkDest = content[li.dataset.src.replace(baseUrl, "")]
            // const linkDest = content[li.dataset.src]
            if (linkDest) {
                const popoverElement = `<div class="popover">
    <h3>${linkDest.title}</h3>
    <p>${removeMarkdown(linkDest.content).split(" ", 20).join(" ")}...</p>
    <p class="meta">${new Date(linkDest.lastmodified).toLocaleDateString()}</p>
</div>`
                const el = htmlToElement(popoverElement)
                li.appendChild(el)
                li.addEventListener("mouseover", () => {
                el.classList.add("visible")
                })
                li.addEventListener("mouseout", () => {
                el.classList.remove("visible")
                })
            }
            })
        })
    })
}