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annotate js/foundation/foundation.magellan.js @ 0:7abe02bf29ec

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initial commit
author Alex Krolick <whokilledtheelectricmonk@gmail.com>
date Sat, 07 Nov 2015 18:04:42 -0800
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1 ;(function ($, window, document, undefined) {
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2 'use strict';
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3
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4 Foundation.libs['magellan-expedition'] = {
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5 name : 'magellan-expedition',
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6
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7 version : '5.5.3',
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8
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9 settings : {
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10 active_class : 'active',
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11 threshold : 0, // pixels from the top of the expedition for it to become fixes
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12 destination_threshold : 20, // pixels from the top of destination for it to be considered active
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13 throttle_delay : 30, // calculation throttling to increase framerate
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14 fixed_top : 0, // top distance in pixels assigend to the fixed element on scroll
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15 offset_by_height : true, // whether to offset the destination by the expedition height. Usually you want this to be true, unless your expedition is on the side.
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16 duration : 700, // animation duration time
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17 easing : 'swing' // animation easing
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18 },
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19
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20 init : function (scope, method, options) {
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21 Foundation.inherit(this, 'throttle');
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22 this.bindings(method, options);
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23 },
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24
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25 events : function () {
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26 var self = this,
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27 S = self.S,
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28 settings = self.settings;
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29
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30 // initialize expedition offset
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31 self.set_expedition_position();
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32
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33 S(self.scope)
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34 .off('.magellan')
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35 .on('click.fndtn.magellan', '[' + self.add_namespace('data-magellan-arrival') + '] a[href*=#]', function (e) {
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36 var sameHost = ((this.hostname === location.hostname) || !this.hostname),
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37 samePath = self.filterPathname(location.pathname) === self.filterPathname(this.pathname),
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38 testHash = this.hash.replace(/(:|\.|\/)/g, '\\$1'),
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39 anchor = this;
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40
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41 if (sameHost && samePath && testHash) {
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42 e.preventDefault();
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43 var expedition = $(this).closest('[' + self.attr_name() + ']'),
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44 settings = expedition.data('magellan-expedition-init'),
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45 hash = this.hash.split('#').join(''),
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46 target = $('a[name="' + hash + '"]');
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47
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48 if (target.length === 0) {
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49 target = $('#' + hash);
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50
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51 }
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52
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53 // Account for expedition height if fixed position
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54 var scroll_top = target.offset().top - settings.destination_threshold + 1;
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55 if (settings.offset_by_height) {
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56 scroll_top = scroll_top - expedition.outerHeight();
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57 }
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58 $('html, body').stop().animate({
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59 'scrollTop' : scroll_top
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60 }, settings.duration, settings.easing, function () {
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61 if (history.pushState) {
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62 history.pushState(null, null, anchor.pathname + anchor.search + '#' + hash);
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63 } else {
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64 location.hash = anchor.pathname + anchor.search + '#' + hash;
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65 }
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66 });
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67 }
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68 })
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69 .on('scroll.fndtn.magellan', self.throttle(this.check_for_arrivals.bind(this), settings.throttle_delay));
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70 },
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71
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72 check_for_arrivals : function () {
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73 var self = this;
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74 self.update_arrivals();
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75 self.update_expedition_positions();
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76 },
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77
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78 set_expedition_position : function () {
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79 var self = this;
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80 $('[' + this.attr_name() + '=fixed]', self.scope).each(function (idx, el) {
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81 var expedition = $(this),
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82 settings = expedition.data('magellan-expedition-init'),
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83 styles = expedition.attr('styles'), // save styles
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84 top_offset, fixed_top;
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85
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86 expedition.attr('style', '');
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87 top_offset = expedition.offset().top + settings.threshold;
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88
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89 //set fixed-top by attribute
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90 fixed_top = parseInt(expedition.data('magellan-fixed-top'));
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91 if (!isNaN(fixed_top)) {
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92 self.settings.fixed_top = fixed_top;
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93 }
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94
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95 expedition.data(self.data_attr('magellan-top-offset'), top_offset);
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96 expedition.attr('style', styles);
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97 });
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98 },
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99
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100 update_expedition_positions : function () {
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101 var self = this,
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102 window_top_offset = $(window).scrollTop();
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103
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104 $('[' + this.attr_name() + '=fixed]', self.scope).each(function () {
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105 var expedition = $(this),
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106 settings = expedition.data('magellan-expedition-init'),
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107 styles = expedition.attr('style'), // save styles
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108 top_offset = expedition.data('magellan-top-offset');
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109
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110 //scroll to the top distance
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111 if (window_top_offset + self.settings.fixed_top >= top_offset) {
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112 // Placeholder allows height calculations to be consistent even when
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113 // appearing to switch between fixed/non-fixed placement
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114 var placeholder = expedition.prev('[' + self.add_namespace('data-magellan-expedition-clone') + ']');
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115 if (placeholder.length === 0) {
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116 placeholder = expedition.clone();
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117 placeholder.removeAttr(self.attr_name());
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118 placeholder.attr(self.add_namespace('data-magellan-expedition-clone'), '');
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119 expedition.before(placeholder);
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120 }
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121 expedition.css({position :'fixed', top : settings.fixed_top}).addClass('fixed');
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122 } else {
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123 expedition.prev('[' + self.add_namespace('data-magellan-expedition-clone') + ']').remove();
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124 expedition.attr('style', styles).css('position', '').css('top', '').removeClass('fixed');
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125 }
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126 });
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127 },
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128
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129 update_arrivals : function () {
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130 var self = this,
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131 window_top_offset = $(window).scrollTop();
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132
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133 $('[' + this.attr_name() + ']', self.scope).each(function () {
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134 var expedition = $(this),
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135 settings = expedition.data(self.attr_name(true) + '-init'),
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136 offsets = self.offsets(expedition, window_top_offset),
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137 arrivals = expedition.find('[' + self.add_namespace('data-magellan-arrival') + ']'),
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138 active_item = false;
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139 offsets.each(function (idx, item) {
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140 if (item.viewport_offset >= item.top_offset) {
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141 var arrivals = expedition.find('[' + self.add_namespace('data-magellan-arrival') + ']');
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142 arrivals.not(item.arrival).removeClass(settings.active_class);
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143 item.arrival.addClass(settings.active_class);
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144 active_item = true;
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145 return true;
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146 }
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147 });
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148
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149 if (!active_item) {
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150 arrivals.removeClass(settings.active_class);
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151 }
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152 });
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153 },
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154
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155 offsets : function (expedition, window_offset) {
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156 var self = this,
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157 settings = expedition.data(self.attr_name(true) + '-init'),
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158 viewport_offset = window_offset;
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159
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160 return expedition.find('[' + self.add_namespace('data-magellan-arrival') + ']').map(function (idx, el) {
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161 var name = $(this).data(self.data_attr('magellan-arrival')),
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162 dest = $('[' + self.add_namespace('data-magellan-destination') + '=' + name + ']');
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163 if (dest.length > 0) {
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164 var top_offset = dest.offset().top - settings.destination_threshold;
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165 if (settings.offset_by_height) {
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166 top_offset = top_offset - expedition.outerHeight();
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167 }
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168 top_offset = Math.floor(top_offset);
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169 return {
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170 destination : dest,
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171 arrival : $(this),
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172 top_offset : top_offset,
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173 viewport_offset : viewport_offset
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174 }
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175 }
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176 }).sort(function (a, b) {
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177 if (a.top_offset < b.top_offset) {
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178 return -1;
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179 }
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180 if (a.top_offset > b.top_offset) {
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181 return 1;
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182 }
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183 return 0;
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184 });
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185 },
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186
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187 data_attr : function (str) {
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188 if (this.namespace.length > 0) {
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189 return this.namespace + '-' + str;
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190 }
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191
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192 return str;
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193 },
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194
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195 off : function () {
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196 this.S(this.scope).off('.magellan');
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197 this.S(window).off('.magellan');
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198 },
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199
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200 filterPathname : function (pathname) {
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201 pathname = pathname || '';
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202 return pathname
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203 .replace(/^\//,'')
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204 .replace(/(?:index|default).[a-zA-Z]{3,4}$/,'')
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205 .replace(/\/$/,'');
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206 },
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207
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208 reflow : function () {
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209 var self = this;
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210 // remove placeholder expeditions used for height calculation purposes
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211 $('[' + self.add_namespace('data-magellan-expedition-clone') + ']', self.scope).remove();
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212 }
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213 };
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214 }(jQuery, window, window.document));