bootstrap-vue-next
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BootstrapVueNext is an early and lovely component library for Vue 3 & Nuxt 3 based on Bootstrap 5 and Typescript.
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{"version":3,"file":"index.mjs","sources":["../../../../src/composables/useScrollspy/index.ts"],"sourcesContent":["import {syncRef, useIntersectionObserver, useMutationObserver} from '@vueuse/core'\nimport {\n type ComponentPublicInstance,\n computed,\n getCurrentInstance,\n type MaybeRefOrGetter,\n nextTick,\n onMounted,\n readonly,\n type Ref,\n ref,\n toRef,\n watch,\n} from 'vue'\nimport {getElement} from '../../utils/getElement'\n\ntype ScrollspyList = {\n id: string | null\n el: HTMLElement | null\n visible: boolean\n text: string | null\n}[]\n\ninterface ScrollspyReturn {\n current: Readonly<Ref<string | null>>\n list: Readonly<Ref<ScrollspyList>>\n content: Ref<HTMLElement | undefined>\n target: Ref<HTMLElement | undefined>\n scrollIntoView: (event: MouseEvent) => void\n updateList: () => void\n cleanup: () => void\n}\n\ninterface ScrollspyOptions {\n contentQuery: string\n targetQuery: string\n manual: boolean\n root: string | ComponentPublicInstance | HTMLElement | null\n rootMargin: string\n threshold: number | number[]\n watchChanges: boolean\n}\n\nexport const useScrollspy = (\n content: MaybeRefOrGetter<string | ComponentPublicInstance | HTMLElement | null>,\n target: MaybeRefOrGetter<string | ComponentPublicInstance | HTMLElement | null>,\n options: Readonly<Partial<ScrollspyOptions>> = {}\n): ScrollspyReturn => {\n const cont = toRef(content)\n const tar = toRef(target)\n\n const resolvedContent = ref(getElement(cont.value))\n const resolvedTarget = ref(getElement(tar.value))\n\n watch([cont, tar], () => {\n updateList()\n })\n const {\n contentQuery = ':scope > [id]',\n targetQuery = '[href]',\n manual = false,\n root,\n rootMargin = '0px 0px -25%',\n threshold = [0.1, 0.5, 1],\n watchChanges = true,\n } = options\n const current = ref<string | null>(null)\n const list = ref<ScrollspyList>([])\n const nodeList = ref<HTMLElement[]>([])\n\n // are we called in directive?\n const ctx = getCurrentInstance()\n if (!ctx) {\n nextTick(() => {\n updateList()\n })\n } else {\n onMounted(() => {\n syncRef(cont, resolvedContent, {\n transform: {\n ltr: (v) => getElement(v),\n },\n direction: 'ltr',\n immediate: true,\n })\n syncRef(tar, resolvedTarget, {\n transform: {\n ltr: (v) => getElement(v),\n },\n direction: 'ltr',\n immediate: true,\n })\n updateList()\n })\n }\n\n const updateList = () => {\n nodeList.value = resolvedContent.value\n ? (Array.from(resolvedContent.value.querySelectorAll(contentQuery)) as HTMLElement[])\n : []\n list.value = nodeList.value.map((el) => ({\n id: el.id,\n el,\n visible: false,\n text: el.textContent,\n }))\n }\n\n let isScrollingDown = true\n let previousScrollTop = 0\n const scrollRoot = computed(() =>\n resolvedContent.value && getComputedStyle(resolvedContent.value).overflowY === 'visible'\n ? null\n : resolvedContent.value\n )\n\n const iobs = useIntersectionObserver(\n nodeList,\n (entries) => {\n const scrollTop = (scrollRoot.value || document?.documentElement)?.scrollTop\n isScrollingDown = scrollTop > previousScrollTop\n previousScrollTop = scrollTop\n entries.forEach((entry) => {\n if (entry.isIntersecting) {\n list.value.forEach((node) => {\n if (node.el === entry.target) {\n node.visible = true\n }\n })\n return\n }\n list.value.forEach((node) => {\n if (node.el === entry.target) {\n node.visible = false\n }\n })\n })\n let newId: string | null = null\n if (isScrollingDown) {\n newId = [...list.value].reverse().find((node) => node.visible)?.id || null\n } else {\n newId = list.value.find((node) => node.visible)?.id || null\n }\n if (newId !== null) {\n current.value = newId\n }\n if (!current.value) {\n current.value = list.value[0]?.id || null\n }\n },\n {\n root: root ? getElement(root) : scrollRoot,\n rootMargin,\n threshold,\n }\n )\n watch(current, (newId) => {\n if (manual) return\n const nodes = resolvedTarget.value?.querySelectorAll(targetQuery)\n if (nodes === undefined) return\n let foundParent = false\n let activeElement: HTMLElement | null = null\n nodes.forEach((node) => {\n const parentDropdown = node.closest('.dropdown')\n\n if (node.getAttribute('href')?.includes(`#${newId}`)) {\n activeElement = node as HTMLElement\n node.classList.add('active')\n if (parentDropdown) {\n parentDropdown?.querySelector('.dropdown-toggle')?.classList.add('active')\n foundParent = true\n }\n let parentNav = node.closest('.nav')?.previousSibling as HTMLElement\n while (parentNav?.classList?.contains('nav-item')) {\n foundParent = true\n parentNav.querySelector('.nav-link')?.classList.add('active')\n parentNav = parentNav.closest('.nav')?.previousSibling as HTMLElement\n }\n } else {\n node.classList.remove('active')\n if (parentDropdown && !foundParent) {\n parentDropdown?.querySelector('.dropdown-toggle')?.classList.remove('active')\n }\n\n if (!foundParent) {\n let parentNav = node.closest('.nav')?.previousSibling as HTMLElement\n while (parentNav?.classList?.contains('nav-item')) {\n foundParent = true\n parentNav.querySelector('.nav-link') !== activeElement &&\n parentNav.querySelector('.nav-link')?.classList.remove('active')\n parentNav = parentNav.closest('.nav')?.previousSibling as HTMLElement\n }\n }\n }\n })\n })\n\n const mobs = !watchChanges\n ? {stop: () => {}}\n : useMutationObserver(\n resolvedContent,\n () => {\n updateList()\n },\n {\n childList: true,\n }\n )\n const scrollIntoView = (event: Readonly<MouseEvent>, smooth: boolean = false) => {\n event.preventDefault()\n const href = (event.target as HTMLElement)?.getAttribute?.('href')\n const el: HTMLElement | null = href ? document?.querySelector(href) : null\n // console.log('scrollIntoView', event, el, content.value.$el)\n if (el && resolvedContent.value) {\n resolvedContent.value.scrollTo\n ? resolvedContent.value.scrollTo({top: el.offsetTop, behavior: smooth ? 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