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toc.ts
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59 lines (51 loc) · 1.25 KB
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import type { Ref } from 'vue'
import { breakpointsTailwind } from '@vueuse/core'
export function useToc() {
const breakpoints = useBreakpoints(breakpointsTailwind)
const lgAndLarger = breakpoints.greater('lg')
interface Toc {
header: string
id: string
}
const theToc: Ref<Toc[]> = ref([])
const createToc = () => {
const h2 = document.getElementsByTagName('h2')
theToc.value = Array.from(h2).map((item) => {
return { header: item.innerText, id: item.id }
})
}
const currentSection = ref('')
const getObserver = () => {
const observer = new IntersectionObserver(
(entries) => {
entries.forEach((entry) => {
if (entry.intersectionRatio > 0) {
currentSection.value = entry.target.getAttribute('id') as string
}
})
},
{
rootMargin: '0px 0px -50% 0px',
}
)
document.querySelectorAll('article h2').forEach((section) => {
observer.observe(section)
})
}
const initToc = () => {
if (lgAndLarger.value) {
createToc()
getObserver()
}
}
const route = useRoute()
onMounted(() => {
initToc()
})
watch(route, () => {
nextTick(() => {
initToc()
})
})
return { theToc, currentSection }
}