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twbs--bootstrap/js/bootstrap-scrollspy.js
2011-09-16 11:09:26 -07:00

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2.9 KiB
JavaScript

/* =============================================================
* bootstrap-scrollspy.js v1.3.0
* http://twitter.github.com/bootstrap/javascript.html#scrollspy
* =============================================================
* Copyright 2011 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 ( $ ) {
var $window = $(window)
function ScrollSpy( topbar, selector ) {
var processScroll = $.proxy(this.processScroll, this)
this.$topbar = $(topbar)
this.selector = selector || 'li > a'
this.refresh()
this.$topbar.delegate(this.selector, 'click', processScroll)
$window.scroll(processScroll)
this.processScroll()
}
ScrollSpy.prototype = {
refresh: function () {
this.targets = this.$topbar.find(this.selector).map(function () {
var href = $(this).attr('href')
return /^#\w/.test(href) && $(href).length ? href : null
})
this.offsets = $.map(this.targets, function (id) {
return $(id).offset().top
})
}
, processScroll: function () {
var scrollTop = $window.scrollTop() + 10
, offsets = this.offsets
, targets = this.targets
, activeTarget = this.activeTarget
, i
for (i = offsets.length; i--;) {
activeTarget != targets[i]
&& scrollTop >= offsets[i]
&& (!offsets[i + 1] || scrollTop <= offsets[i + 1])
&& this.activateButton( targets[i] )
}
}
, activateButton: function (target) {
this.activeTarget = target
this.$topbar
.find(this.selector).parent('.active')
.removeClass('active')
this.$topbar
.find(this.selector + '[href="' + target + '"]')
.parent('li')
.addClass('active')
}
}
/* SCROLLSPY PLUGIN DEFINITION
* =========================== */
$.fn.scrollSpy = function( options ) {
var scrollspy = this.data('scrollspy')
if (!scrollspy) {
return this.each(function () {
$(this).data('scrollspy', new ScrollSpy( this, options ))
})
}
if ( options === true ) {
return scrollspy
}
if ( typeof options == 'string' ) {
scrollspy[options]()
}
return this
}
$(document).ready(function () {
$('body').scrollSpy('[data-scrollspy] li > a')
})
}( window.jQuery || window.ender )