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annotate geotemco/lib/jquery/jquery.remember.js @ 0:b12c99b7c3f0

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commit for previous development
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Mon, 19 Jan 2015 17:13:49 +0100
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*!
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2 *
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3 * jQuery Remember Plugin
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4 * Version 0.1.1
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5 *
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6 * Copyright Nick Dreckshage, licensed GPL & MIT
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7 * https://github.com/ndreckshage/jquery-remember
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8 *
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9 * A fork of jQuery Cookie Plugin
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10 * https://github.com/carhartl/jquery-cookie
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11 * Copyright Klaus Hartl
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12 * Released under the MIT licensed
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13 *
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14 */
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15
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16 (function($){
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17
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18 // recommend changing to return function(options) { if using require.js...
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19 $.remember = function(options){
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20 var settings,
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21 remember,
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22 controller;
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23
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24 settings = $.extend({
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25 name: null, // name/key of the cookie/localstorage item
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26 value: undefined, // value pair of cookie/localstorage
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27 getSet: false, // if true, will get if available, set if not. default is to just get OR set
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28 remove: false, // if true, will remove based on name/key
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29 use: 'default', // whether to use localstorage or cookies. default localstorage with cookie fallback.
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30 expires: null, // forces cookie (invalid localstorage attribue).
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31 path: null, // forces cookie.
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32 domain: null, // forces cookie.
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33 secure: null, // forces cookie.
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34 json: false, // will convert to json when set. parse with get.
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35 fallback: true, // whether to fallback to cookies if localstorage not available.
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36 raw: false, // if true, will skip uri encoding/decoding
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37 modernizr: false // set true if youd rather handle localstorage detection through modernizr
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38 }, options);
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39
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40 remember = {
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41 init: function(){
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42 var controller;
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43
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44 // controls what to do with the input. set - get - set/get - erase
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45 // set if name exists, value exists, and not set to remove cookie.
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46 // get if name exists, value does not exist, and not set to remove
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47 // remove if remove set to true
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48 if (settings.name !== null && settings.value !== undefined && settings.remove !== true){
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49 if (settings.getSet === true){
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50 var get = this.get();
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51 // if the value of get exists, return it. otherwise, set the value as specified.
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52 if (get === null){
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53 this.set();
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54 } else {
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55 controller = get;
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56 }
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57 } else {
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58 this.set();
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59 }
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60 } else if (settings.name !== null && settings.value === undefined && settings.remove !== true){
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61 controller = this.get();
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62 } else if (settings.name !== null && settings.remove === true){
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63 this.erase();
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64 }
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65
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66 // will return result of everything to calling js
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67 return controller;
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68 },
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69 get: function(){
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70 var use = this._use(),
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71 value = null,
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72 cookies,
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73 parts,
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74 name;
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75
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76 // grab the key value pair from localstorage
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77 if (use === 'localstorage') {
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78 value = localStorage.getItem(settings.name);
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79 }
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80
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81 // hit if cookie requested, and when double checking a get on an empty localstorage item
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82 if ((use === 'cookie') || (use === 'localstorage' && value === null && settings.fallback !== false)) {
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83
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84 // grab all the cookies from the browser, check if set, and loop through
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85 cookies = document.cookie ? document.cookie : null;
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86 if (cookies !== null){
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87 cookies = cookies.split(';');
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88 for (var i = 0; i < cookies.length; i++){
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89 // separate the key value pair
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90 parts = cookies[i].split('=');
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91 // set name and value to split parts, cleaning up whitespace
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92 name = parts.shift();
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93 name = settings.raw === false ? this._trim(this._decode(name)) : this._trim(name);
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94 value = parts[0];
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95 // break when we hit a match, or cookie is empty
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96 if (settings.name === name) {
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97 break;
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98 } else if (settings.fallback !== false) {
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99 value = localStorage.getItem(settings.name) || null;
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100 } else {
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101 value = null;
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102 }
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103 }
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104 }
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105 }
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106
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107 // decode uri and if json is requested, parse the cookie/localstorage and return to controller
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108 value = (value && settings.raw === false) ? this._decode(value) : value;
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109 value = (value && settings.json === true) ? JSON.parse(value) : value;
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110
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111 return value;
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112 },
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113 set: function(){
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114 var use = this._use();
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115
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116 // if set is hit, user has intentionally tried to set (get/set not hit)
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117 // clear the storage alternative, so the same value isnt stored in both
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118 this.erase();
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119
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120 // convert the value to store in json if requested
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121 settings.value = settings.json === true ? JSON.stringify(settings.value) : settings.value;
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122
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123 // encode
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124 settings.name = settings.raw === false ? encodeURIComponent(settings.name) : settings.name;
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125 settings.value = settings.raw === false ? encodeURIComponent(settings.value) : settings.value;
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126
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127 // store the key value pair in appropriate storage. set unless storage requirements failed
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128 if (use === 'localstorage'){
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129 localStorage.setItem(settings.name, settings.value);
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130 } else if (use !== false){
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131 // convert values that cant be stored and set
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132 settings.value = settings.value === null ? 'null' : settings.value;
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133 this._setCookie();
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134 }
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135 },
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136 erase: function(){
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137 var use = this._use();
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138
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139 // clear localstorage and cookies by setting expiration to negative
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140 if (use !== 'cookie' || settings.fallback !== false){
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141 localStorage.removeItem(settings.name);
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142 }
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143 if (use !== 'localstorage' || settings.fallback !== false){
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144 this._setCookie('', -1);
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145 }
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146 },
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147 _use: function(){
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148 var use,
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149 localStorageSupport = this._localStorage();
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150
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151 // if cookie requested, or any options set that only apply to cookies
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152 if (settings.use === 'cookie' || settings.expires !== null || settings.path !== null || settings.domain !== null || settings.secure !== null){
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153 use = 'cookie';
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154 } else {
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155 // use local storage if available
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156 if (localStorageSupport){
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157 use = 'localstorage';
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158 } else if (settings.fallback !== false) {
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159 // default to cookie, unless fallback banned
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160 use = 'cookie';
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161 } else {
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162 // if all this fails, nothing can be set
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163 use = false;
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164 }
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165 }
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166
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167 return use;
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168 },
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169 _setCookie: function(){
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170 // allow for varying parameters with defaults. value then expires as optional params
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171 var value = arguments.length > 0 ? arguments[0] : settings.value,
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172 expires = arguments.length > 1 ? arguments[1] : settings.expires,
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173 expire;
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174
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175 // set a date in the future (or negative to delete) based on expires date offset
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176 if (typeof expires === 'number') {
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177 expire = new Date();
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178 expire.setDate(expire.getDate() + expires);
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179 }
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180
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181 // set the cookies with all the varying settings
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182 document.cookie = [
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183 settings.name,
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184 '=',
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185 value,
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186 expire ? '; expires=' + expire.toUTCString() : '',
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187 settings.path ? '; path=' + settings.path : '',
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188 settings.domain ? '; domain=' + settings.domain : '',
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189 settings.secure ? '; secure' : ''
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190 ].join('');
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191 },
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192 _localStorage: function(){
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193 if (settings.modernizr === true && typeof Modernizr !== 'undefined'){
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194 return Modernizr.localstorage;
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195 } else {
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196 // check if a browser supports localstorage with simple try catch
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197 try {
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198 localStorage.setItem('jquery-remember-test','jquery-remember-test');
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199 localStorage.removeItem('jquery-remember-test');
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200 return true;
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201 } catch(e){
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202 return false;
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203 }
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204 }
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205 },
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206 _trim: function(s){
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207 // trail a strings leading/ending whitespace
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208 return s.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
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209 },
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210 _decode: function(s){
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211 return decodeURIComponent(s.replace(/\+/g, ' '));
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212 }
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213 };
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214
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215 return remember.init();
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216 };
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217
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218 return $.remember;
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219
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220 }(jQuery));