collapsible toc

quartz/components/scripts/clipboard.inline.ts

@@ -3,27 +3,29 @@ const svgCopy =
 const svgCheck =
   '<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true"><path fill-rule="evenodd" fill="rgb(63, 185, 80)" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg>'
 
-const els = document.getElementsByTagName("pre")
-for (let i = 0; i < els.length; i++) {
-  const codeBlock = els[i].getElementsByTagName("code")[0]
-  const source = codeBlock.innerText.replace(/\n\n/g, "\n")
-  const button = document.createElement("button")
-  button.className = "clipboard-button"
-  button.type = "button"
-  button.innerHTML = svgCopy
-  button.ariaLabel = "Copy source"
-  button.addEventListener("click", () => {
-    navigator.clipboard.writeText(source).then(
-      () => {
-        button.blur()
-        button.innerHTML = svgCheck
-        setTimeout(() => {
-          button.innerHTML = svgCopy
-          button.style.borderColor = ""
-        }, 2000)
-      },
-      (error) => console.error(error),
-    )
-  })
-  els[i].prepend(button)
-}
+document.addEventListener("nav", () => {
+  const els = document.getElementsByTagName("pre")
+  for (let i = 0; i < els.length; i++) {
+    const codeBlock = els[i].getElementsByTagName("code")[0]
+    const source = codeBlock.innerText.replace(/\n\n/g, "\n")
+    const button = document.createElement("button")
+    button.className = "clipboard-button"
+    button.type = "button"
+    button.innerHTML = svgCopy
+    button.ariaLabel = "Copy source"
+    button.addEventListener("click", () => {
+      navigator.clipboard.writeText(source).then(
+        () => {
+          button.blur()
+          button.innerHTML = svgCheck
+          setTimeout(() => {
+            button.innerHTML = svgCopy
+            button.style.borderColor = ""
+          }, 2000)
+        },
+        (error) => console.error(error),
+      )
+    })
+    els[i].prepend(button)
+  }
+})

quartz/components/scripts/spa.inline.ts

@@ -30,7 +30,7 @@ const getOpts = ({ target }: Event): { url: URL, scroll?: boolean } | undefined
 }
 
 function notifyNav(slug: string) {
-  const event = new CustomEvent("spa_nav", { detail: { slug } })
+  const event = new CustomEvent("nav", { detail: { slug } })
   document.dispatchEvent(event)
 }
 
@@ -96,6 +96,7 @@ function createRouter() {
       return
     })
   }
+
   return new class Router {
     go(pathname: string) {
       const url = new URL(pathname, window.location.toString())
@@ -113,6 +114,7 @@ function createRouter() {
 }
 
 createRouter()
+notifyNav(document.body.dataset.slug!)
 
 if (!customElements.get('route-announcer')) {
   const attrs = {

quartz/components/scripts/toc.inline.ts

@@ -0,0 +1,35 @@
+const bufferPx = 150
+const observer = new IntersectionObserver(entries => {
+  for (const entry of entries) {
+    const slug = entry.target.id
+    const tocEntryElement = document.querySelector(`a[data-for="${slug}"]`)
+    const windowHeight = entry.rootBounds?.height
+    if (windowHeight && tocEntryElement) {
+      if (entry.boundingClientRect.y < windowHeight) {
+        tocEntryElement.classList.add("in-view")
+      } else {
+        tocEntryElement.classList.remove("in-view")
+      }
+    }
+  }
+})
+
+function toggleCollapsible(this: HTMLElement) {
+  this.classList.toggle("collapsed")
+  const content = this.nextElementSibling as HTMLElement
+  content.classList.toggle("collapsed")
+  content.style.maxHeight = content.style.maxHeight === "0px" ? content.scrollHeight + "px" : "0px"
+}
+
+document.addEventListener("nav", () => {
+  const toc = document.getElementById("toc")!
+  const content = toc.nextElementSibling as HTMLElement
+  content.style.maxHeight = content.scrollHeight + "px"
+  toc.removeEventListener("click", toggleCollapsible)
+  toc.addEventListener("click", toggleCollapsible)
+
+  // update toc entry highlighting
+  observer.disconnect()
+  const headers = document.querySelectorAll("h1[id], h2[id], h3[id], h4[id], h5[id], h6[id]")
+  headers.forEach(header => observer.observe(header))
+})