quartz/assets/js/popover.js

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

function initPopover(baseURL) {
  const basePath = baseURL.replace(window.location.origin, "")
  document.addEventListener("DOMContentLoaded", () => {
    fetchData.then(({ content }) => {
      const links = [...document.getElementsByClassName("internal-link")]
      links.forEach(li => {
        const linkDest = content[li.dataset.src.replace(basePath, "")]
        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")
          })
        }
      })
    })
  })
}