mirror of
https://github.com/twbs/bootstrap.git
synced 2025-02-23 18:40:03 +00:00
148 lines
4.1 KiB
JavaScript
148 lines
4.1 KiB
JavaScript
/* ========================================================================
|
||
* Bootstrap: scrollspy.js v3.1.0
|
||
* http://getbootstrap.com/javascript/#scrollspy
|
||
* ========================================================================
|
||
* Copyright 2013 Twitter, Inc.
|
||
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
|
||
* ======================================================================== */
|
||
|
||
|
||
+function ($) { 'use strict';
|
||
|
||
// SCROLLSPY CLASS DEFINITION
|
||
// ==========================
|
||
|
||
function ScrollSpy(element, options) {
|
||
var href
|
||
var process = $.proxy(this.process, this)
|
||
|
||
this.$element = $(element).is('body') ? $(window) : $(element)
|
||
this.$body = $('body')
|
||
this.$scrollElement = this.$element.on('scroll.bs.scroll-spy.data-api', process)
|
||
this.options = $.extend({}, ScrollSpy.DEFAULTS, options)
|
||
this.selector = (this.options.target
|
||
|| ((href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
|
||
|| '') + ' .nav li > a'
|
||
this.offsets = $([])
|
||
this.targets = $([])
|
||
this.activeTarget = null
|
||
|
||
this.refresh()
|
||
this.process()
|
||
}
|
||
|
||
ScrollSpy.DEFAULTS = {
|
||
offset: 10
|
||
}
|
||
|
||
ScrollSpy.prototype.refresh = function () {
|
||
var offsetMethod = this.$element[0] == window ? 'offset' : 'position'
|
||
|
||
this.offsets = $([])
|
||
this.targets = $([])
|
||
|
||
var self = this
|
||
var $targets = this.$body
|
||
.find(this.selector)
|
||
.map(function () {
|
||
var $el = $(this)
|
||
var href = $el.data('target') || $el.attr('href')
|
||
var $href = /^#\w/.test(href) && $(href)
|
||
|
||
return ($href
|
||
&& $href.length
|
||
&& [[ $href[offsetMethod]().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href ]]) || null
|
||
})
|
||
.sort(function (a, b) { return a[0] - b[0] })
|
||
.each(function () {
|
||
self.offsets.push(this[0])
|
||
self.targets.push(this[1])
|
||
})
|
||
}
|
||
|
||
ScrollSpy.prototype.process = function () {
|
||
var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
|
||
var scrollHeight = this.$scrollElement[0].scrollHeight || Math.max(this.$body[0].scrollHeight,document.documentElement.scrollHeight)
|
||
var maxScroll = scrollHeight - this.$scrollElement.height()
|
||
var offsets = this.offsets
|
||
var targets = this.targets
|
||
var activeTarget = this.activeTarget
|
||
var i
|
||
|
||
if (scrollTop >= maxScroll) {
|
||
return activeTarget != (i = targets.last()[0]) && this.activate(i)
|
||
}
|
||
|
||
for (i = offsets.length; i--;) {
|
||
activeTarget != targets[i]
|
||
&& scrollTop >= offsets[i]
|
||
&& (!offsets[i + 1] || scrollTop <= offsets[i + 1])
|
||
&& this.activate( targets[i] )
|
||
}
|
||
}
|
||
|
||
ScrollSpy.prototype.activate = function (target) {
|
||
this.activeTarget = target
|
||
|
||
$(this.selector)
|
||
.parents('.active')
|
||
.removeClass('active')
|
||
|
||
var selector = this.selector
|
||
+ '[data-target="' + target + '"],'
|
||
+ this.selector + '[href="' + target + '"]'
|
||
|
||
var active = $(selector)
|
||
.parents('li')
|
||
.addClass('active')
|
||
|
||
if (active.parent('.dropdown-menu').length) {
|
||
active = active
|
||
.closest('li.dropdown')
|
||
.addClass('active')
|
||
}
|
||
|
||
active.trigger('activate.bs.scrollspy')
|
||
}
|
||
|
||
|
||
// SCROLLSPY PLUGIN DEFINITION
|
||
// ===========================
|
||
|
||
var old = $.fn.scrollspy
|
||
|
||
$.fn.scrollspy = function (option) {
|
||
return this.each(function () {
|
||
var $this = $(this)
|
||
var data = $this.data('bs.scrollspy')
|
||
var options = typeof option == 'object' && option
|
||
|
||
if (!data) $this.data('bs.scrollspy', (data = new ScrollSpy(this, options)))
|
||
if (typeof option == 'string') data[option]()
|
||
})
|
||
}
|
||
|
||
$.fn.scrollspy.Constructor = ScrollSpy
|
||
|
||
|
||
// SCROLLSPY NO CONFLICT
|
||
// =====================
|
||
|
||
$.fn.scrollspy.noConflict = function () {
|
||
$.fn.scrollspy = old
|
||
return this
|
||
}
|
||
|
||
|
||
// SCROLLSPY DATA-API
|
||
// ==================
|
||
|
||
$(window).on('load', function () {
|
||
$('[data-spy="scroll"]').each(function () {
|
||
var $spy = $(this)
|
||
$spy.scrollspy($spy.data())
|
||
})
|
||
})
|
||
|
||
}(jQuery);
|