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/* =============================================================
* bootstrap-scrollspy.js v2.0.4
* http://twitter.github.com/bootstrap/javascript.html#scrollspy
* =============================================================
* Copyright 2012 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============================================================== */
!function ($) {
"use strict"; // jshint ;_;
/* SCROLLSPY CLASS DEFINITION
* ========================== */
function ScrollSpy( element, options) {
var process = $.proxy(this.process, this)
, $element = $(element).is('body') ? $(window) : $(element)
, href
this.options = $.extend({}, $.fn.scrollspy.defaults, options)
this.$scrollElement = $element.on('scroll.scroll.data-api', process)
this.selector = (this.options.target
|| ((href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
|| '') + ' .nav li > a'
this.$body = $('body')
this.refresh()
this.process()
}
ScrollSpy.prototype = {
constructor: ScrollSpy
, refresh: function () {
var self = this
, $targets
this.offsets = $([])
this.targets = $([])
$targets = this.$body
.find(this.selector)
.map(function () {
var $el = $(this)
, href = $el.data('target') || $el.attr('href')
, $href = /^#\w/.test(href) && $(href)
return ( $href
&& href.length
&& [[ $href.position().top, href ]] ) || null
})
.sort(function (a, b) { return a[0] - b[0] })
.each(function () {
self.offsets.push(this[0])
self.targets.push(this[1])
})
}
, process: function () {
var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
, scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight
, maxScroll = scrollHeight - this.$scrollElement.height()
, offsets = this.offsets
, targets = this.targets
, activeTarget = this.activeTarget
, 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] )
}
}
, activate: function (target) {
var active
, selector
this.activeTarget = target
$(this.selector)
.parent('.active')
.removeClass('active')
selector = this.selector
+ '[data-target="' + target + '"],'
+ this.selector + '[href="' + target + '"]'
active = $(selector)
.parent('li')
.addClass('active')
if (active.parent('.dropdown-menu')) {
active = active.closest('li.dropdown').addClass('active')
}
active.trigger('activate')
}
}
/* SCROLLSPY PLUGIN DEFINITION
* =========================== */
$.fn.scrollspy = function ( option ) {
return this.each(function () {
var $this = $(this)
, data = $this.data('scrollspy')
, options = typeof option == 'object' && option
if (!data) $this.data('scrollspy', (data = new ScrollSpy(this, options)))
if (typeof option == 'string') data[option]()
})
}
$.fn.scrollspy.Constructor = ScrollSpy
$.fn.scrollspy.defaults = {
offset: 10
}
/* SCROLLSPY DATA-API
* ================== */
$(function () {
$('[data-spy="scroll"]').each(function () {
var $spy = $(this)
$spy.scrollspy($spy.data())
})
})
}(window.jQuery);
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