collapsible callout

quartz/components/scripts/callout.inline.ts

@@ -0,0 +1,24 @@
+function toggleCallout(this: HTMLElement) {
+  const outerBlock = this.parentElement!
+  this.classList.toggle(`is-collapsed`)
+  const collapsed = this.classList.contains(`is-collapsed`)
+  const height = collapsed ? this.scrollHeight : outerBlock.scrollHeight
+  outerBlock.style.maxHeight = height + `px`
+}
+
+function setupCallout(div: HTMLElement) {
+  const collapsed = div.classList.contains(`is-collapsed`)
+  const title = div.firstElementChild!
+  const height = collapsed ? title.scrollHeight : div.scrollHeight
+  div.style.maxHeight = height + `px`
+}
+
+document.addEventListener(`nav`, () => {
+  const collapsible = document.getElementsByClassName(`callout is-collapsible`) as HTMLCollectionOf<HTMLElement>
+  for (const div of collapsible) {
+    const title = div.firstElementChild
+    setupCallout(div)
+    title?.removeEventListener(`click`, toggleCallout)
+    title?.addEventListener(`click`, toggleCallout)
+  }
+})