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comparison static/bootstrap/js/affix.js @ 149:d29e2f337b00

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Updated to Bootstrap 3.0.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 12 Dec 2013 21:54:04 -0800
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148:f02e049d6546 149:d29e2f337b00
1 /* ========================================================================
2 * Bootstrap: affix.js v3.0.3
3 * http://getbootstrap.com/javascript/#affix
4 * ========================================================================
5 * Copyright 2013 Twitter, Inc.
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ======================================================================== */
19
20
21 +function ($) { "use strict";
22
23 // AFFIX CLASS DEFINITION
24 // ======================
25
26 var Affix = function (element, options) {
27 this.options = $.extend({}, Affix.DEFAULTS, options)
28 this.$window = $(window)
29 .on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this))
30 .on('click.bs.affix.data-api', $.proxy(this.checkPositionWithEventLoop, this))
31
32 this.$element = $(element)
33 this.affixed =
34 this.unpin = null
35
36 this.checkPosition()
37 }
38
39 Affix.RESET = 'affix affix-top affix-bottom'
40
41 Affix.DEFAULTS = {
42 offset: 0
43 }
44
45 Affix.prototype.checkPositionWithEventLoop = function () {
46 setTimeout($.proxy(this.checkPosition, this), 1)
47 }
48
49 Affix.prototype.checkPosition = function () {
50 if (!this.$element.is(':visible')) return
51
52 var scrollHeight = $(document).height()
53 var scrollTop = this.$window.scrollTop()
54 var position = this.$element.offset()
55 var offset = this.options.offset
56 var offsetTop = offset.top
57 var offsetBottom = offset.bottom
58
59 if (typeof offset != 'object') offsetBottom = offsetTop = offset
60 if (typeof offsetTop == 'function') offsetTop = offset.top()
61 if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
62
63 var affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ? false :
64 offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? 'bottom' :
65 offsetTop != null && (scrollTop <= offsetTop) ? 'top' : false
66
67 if (this.affixed === affix) return
68 if (this.unpin) this.$element.css('top', '')
69
70 this.affixed = affix
71 this.unpin = affix == 'bottom' ? position.top - scrollTop : null
72
73 this.$element.removeClass(Affix.RESET).addClass('affix' + (affix ? '-' + affix : ''))
74
75 if (affix == 'bottom') {
76 this.$element.offset({ top: document.body.offsetHeight - offsetBottom - this.$element.height() })
77 }
78 }
79
80
81 // AFFIX PLUGIN DEFINITION
82 // =======================
83
84 var old = $.fn.affix
85
86 $.fn.affix = function (option) {
87 return this.each(function () {
88 var $this = $(this)
89 var data = $this.data('bs.affix')
90 var options = typeof option == 'object' && option
91
92 if (!data) $this.data('bs.affix', (data = new Affix(this, options)))
93 if (typeof option == 'string') data[option]()
94 })
95 }
96
97 $.fn.affix.Constructor = Affix
98
99
100 // AFFIX NO CONFLICT
101 // =================
102
103 $.fn.affix.noConflict = function () {
104 $.fn.affix = old
105 return this
106 }
107
108
109 // AFFIX DATA-API
110 // ==============
111
112 $(window).on('load', function () {
113 $('[data-spy="affix"]').each(function () {
114 var $spy = $(this)
115 var data = $spy.data()
116
117 data.offset = data.offset || {}
118
119 if (data.offsetBottom) data.offset.bottom = data.offsetBottom
120 if (data.offsetTop) data.offset.top = data.offsetTop
121
122 $spy.affix(data)
123 })
124 })
125
126 }(jQuery);