-
Pierre-Denis Vanduynslager authoredd1b742f2
import Util from './util'/** * -------------------------------------------------------------------------- * Bootstrap (v4.0.0-alpha.5): scrollspy.js * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) * -------------------------------------------------------------------------- */const ScrollSpy = (($) => { /** * ------------------------------------------------------------------------ * Constants * ------------------------------------------------------------------------ */ const NAME = 'scrollspy' const VERSION = '4.0.0-alpha.5' const DATA_KEY = 'bs.scrollspy' const EVENT_KEY = `.${DATA_KEY}` const DATA_API_KEY = '.data-api' const JQUERY_NO_CONFLICT = $.fn[NAME] const Default = { offset : 10, method : 'auto', target : '' } const DefaultType = { offset : 'number', method : 'string', target : '(string|element)' } const Event = { ACTIVATE : `activate${EVENT_KEY}`, SCROLL : `scroll${EVENT_KEY}`, LOAD_DATA_API : `load${EVENT_KEY}${DATA_API_KEY}` } const ClassName = { DROPDOWN_ITEM : 'dropdown-item', DROPDOWN_MENU : 'dropdown-menu', NAV_LINK : 'nav-link', NAV : 'nav', ACTIVE : 'active' } const Selector = { DATA_SPY : '[data-spy="scroll"]', ACTIVE : '.active', LIST_ITEM : '.list-item', LI : 'li', LI_DROPDOWN : 'li.dropdown', NAV_LINKS : '.nav-link', DROPDOWN : '.dropdown', DROPDOWN_ITEMS : '.dropdown-item', DROPDOWN_TOGGLE : '.dropdown-toggle' } const OffsetMethod = { OFFSET : 'offset', POSITION : 'position' }7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
/**
* ------------------------------------------------------------------------
* Class Definition
* ------------------------------------------------------------------------
*/
class ScrollSpy {
constructor(element, config) {
this._element = element
this._scrollElement = element.tagName === 'BODY' ? window : element
this._config = this._getConfig(config)
this._selector = `${this._config.target} ${Selector.NAV_LINKS},`
+ `${this._config.target} ${Selector.DROPDOWN_ITEMS}`
this._offsets = []
this._targets = []
this._activeTarget = null
this._scrollHeight = 0
$(this._scrollElement).on(Event.SCROLL, (event) => this._process(event))
this.refresh()
this._process()
}
// getters
static get VERSION() {
return VERSION
}
static get Default() {
return Default
}
// public
refresh() {
const autoMethod = this._scrollElement !== this._scrollElement.window ?
OffsetMethod.POSITION : OffsetMethod.OFFSET
const offsetMethod = this._config.method === 'auto' ?
autoMethod : this._config.method
const offsetBase = offsetMethod === OffsetMethod.POSITION ?
this._getScrollTop() : 0
this._offsets = []
this._targets = []
this._scrollHeight = this._getScrollHeight()
const targets = $.makeArray($(this._selector))
targets
.map((element) => {
let target
const targetSelector = Util.getSelectorFromElement(element)
if (targetSelector) {
target = $(targetSelector)[0]
}
if (target && (target.offsetWidth || target.offsetHeight)) {
// todo (fat): remove sketch reliance on jQuery position/offset
return [
$(target)[offsetMethod]().top + offsetBase,
targetSelector
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]
}
return null
})
.filter((item) => item)
.sort((a, b) => a[0] - b[0])
.forEach((item) => {
this._offsets.push(item[0])
this._targets.push(item[1])
})
}
dispose() {
$.removeData(this._element, DATA_KEY)
$(this._scrollElement).off(EVENT_KEY)
this._element = null
this._scrollElement = null
this._config = null
this._selector = null
this._offsets = null
this._targets = null
this._activeTarget = null
this._scrollHeight = null
}
// private
_getConfig(config) {
config = $.extend({}, Default, config)
if (typeof config.target !== 'string') {
let id = $(config.target).attr('id')
if (!id) {
id = Util.getUID(NAME)
$(config.target).attr('id', id)
}
config.target = `#${id}`
}
Util.typeCheckConfig(NAME, config, DefaultType)
return config
}
_getScrollTop() {
return this._scrollElement === window ?
this._scrollElement.pageYOffset : this._scrollElement.scrollTop
}
_getScrollHeight() {
return this._scrollElement.scrollHeight || Math.max(
document.body.scrollHeight,
document.documentElement.scrollHeight
)
}
_getOffsetHeight() {
return this._scrollElement === window ?
window.innerHeight : this._scrollElement.offsetHeight
}
_process() {
const scrollTop = this._getScrollTop() + this._config.offset
const scrollHeight = this._getScrollHeight()
const maxScroll = this._config.offset
+ scrollHeight
- this._getOffsetHeight()
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if (this._scrollHeight !== scrollHeight) {
this.refresh()
}
if (scrollTop >= maxScroll) {
const target = this._targets[this._targets.length - 1]
if (this._activeTarget !== target) {
this._activate(target)
}
return
}
if (this._activeTarget && scrollTop < this._offsets[0] && this._offsets[0] > 0) {
this._activeTarget = null
this._clear()
return
}
for (let i = this._offsets.length; i--;) {
const isActiveTarget = this._activeTarget !== this._targets[i]
&& scrollTop >= this._offsets[i]
&& (this._offsets[i + 1] === undefined ||
scrollTop < this._offsets[i + 1])
if (isActiveTarget) {
this._activate(this._targets[i])
}
}
}
_activate(target) {
this._activeTarget = target
this._clear()
let queries = this._selector.split(',')
queries = queries.map((selector) => {
return `${selector}[data-target="${target}"],` +
`${selector}[href="${target}"]`
})
const $link = $(queries.join(','))
if ($link.hasClass(ClassName.DROPDOWN_ITEM)) {
$link.closest(Selector.DROPDOWN).find(Selector.DROPDOWN_TOGGLE).addClass(ClassName.ACTIVE)
$link.addClass(ClassName.ACTIVE)
} else {
// todo (fat) this is kinda sus...
// recursively add actives to tested nav-links
$link.parents(Selector.LI).find(`> ${Selector.NAV_LINKS}`).addClass(ClassName.ACTIVE)
}
$(this._scrollElement).trigger(Event.ACTIVATE, {
relatedTarget: target
})
}
_clear() {
$(this._selector).filter(Selector.ACTIVE).removeClass(ClassName.ACTIVE)
}
// static
static _jQueryInterface(config) {
return this.each(function () {
let data = $(this).data(DATA_KEY)
const _config = typeof config === 'object' && config
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if (!data) {
data = new ScrollSpy(this, _config)
$(this).data(DATA_KEY, data)
}
if (typeof config === 'string') {
if (data[config] === undefined) {
throw new Error(`No method named "${config}"`)
}
data[config]()
}
})
}
}
/**
* ------------------------------------------------------------------------
* Data Api implementation
* ------------------------------------------------------------------------
*/
$(window).on(Event.LOAD_DATA_API, () => {
const scrollSpys = $.makeArray($(Selector.DATA_SPY))
for (let i = scrollSpys.length; i--;) {
const $spy = $(scrollSpys[i])
ScrollSpy._jQueryInterface.call($spy, $spy.data())
}
})
/**
* ------------------------------------------------------------------------
* jQuery
* ------------------------------------------------------------------------
*/
$.fn[NAME] = ScrollSpy._jQueryInterface
$.fn[NAME].Constructor = ScrollSpy
$.fn[NAME].noConflict = function () {
$.fn[NAME] = JQUERY_NO_CONFLICT
return ScrollSpy._jQueryInterface
}
return ScrollSpy
})(jQuery)
export default ScrollSpy