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(baseURL, useContextualBacklinks, renderLatex) {
  const basePath = baseURL.replace(window.location.origin, "")
  fetchData.then(({ content }) => {
    const links = [...document.getElementsByClassName("internal-link")]
    links
      .filter(li => li.dataset.src || (li.dataset.idx && useContextualBacklinks))
      .forEach(li => {
        var el
        if (li.dataset.ctx) {
          const linkDest = content[li.dataset.src]
          const popoverElement = `<div class="popover">
    <h3>${linkDest.title}</h3>
    <p>${highlight(removeMarkdown(linkDest.content), li.dataset.ctx)}...</p>
    <p class="meta">${new Date(linkDest.lastmodified).toLocaleDateString()}</p>
</div>`
          el = htmlToElement(popoverElement)
        } else {
          const linkDest = content[li.dataset.src.replace(/\/$/g, "").replace(basePath, "")]
          console.log(linkDest.content)
          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>`
            el = htmlToElement(popoverElement)
          }
        }
        li.appendChild(el)
        if (renderLatex) {
          renderMathInElement(el, {
            delimiters: [
              { left: '$$', right: '$$', display: false },
              { left: '$', right: '$', display: false },
              { left: '\\(', right: '\\)', display: false },
              { left: '\\[', right: '\\]', display: false }
            ],
            throwOnError: false
          })
        }
        li.addEventListener("mouseover", () => {
          el.classList.add("visible")
        })
        li.addEventListener("mouseout", () => {
          el.classList.remove("visible")
        })

      })
  })
}