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