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604
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1 /*
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2 * digilib jQuery plugin
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3 *
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4 */
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5
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6 (function($) {
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605
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7
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8 var defaults = {
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608
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9 // base URL to Scaler servlet
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10 'scalerBaseUrl' : 'http://digilib.mpiwg-berlin.mpg.de/digitallibrary/servlet/Scaler',
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11 // list of Scaler parameters
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609
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12 'scalerParamNames' : ['fn','pn','dw','dh','ww','wh','wx','wy','ws','mo',
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13 'rot','cont','brgt','rgbm','rgba','ddpi','ddpix','ddpiy'],
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608
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14 // mode of operation.
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15 // fullscreen: takes parameters from page URL, keeps state in page URL
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16 // embedded: takes parameters from Javascript options, keeps state inside object
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605
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17 'interactionMode' : 'fullscreen'
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18 };
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19
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608
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20 // parameters from the query string
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607
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21 var queryParams = {};
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608
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22
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23 // affine geometry classes
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24 var geom = dlGeometry();
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604
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25
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26 var methods = {
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608
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27 // digilib initialization
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604
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28 init : function(options) {
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608
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29 // settings for this digilib instance are merged from defaults and options
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607
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30 var settings = $.extend({}, defaults, options);
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31 var isFullscreen = settings.interactionMode === 'fullscreen';
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32 if (isFullscreen) {
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33 queryParams = parseQueryParams();
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34 };
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604
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35 return this.each(function() {
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605
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36 var $elem = $(this);
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37 var data = $elem.data('digilib');
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607
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38 var elemSettings;
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608
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39 // if the plugin hasn't been initialized yet
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40 if (!data) {
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605
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41 // merge query parameters
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607
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42 if (isFullscreen) {
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43 elemSettings = $.extend({}, settings, queryParams);
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44 } else {
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45 elemSettings = $.extend({}, settings, parseImgParams($elem));
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46 };
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605
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47 // store in data element
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48 $elem.data('digilib', {
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49 target : $elem,
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607
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50 settings : elemSettings
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51 });
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52 }
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608
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53 // create HTML structure
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54 setupScalerDiv($elem, elemSettings);
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604
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55 });
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56 },
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608
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57
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58 // clean up digilib
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604
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59 destroy : function() {
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60 return this.each(function(){
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61 var $this = $(this);
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62 var data = $this.data('digilib');
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63 // Namespacing FTW
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605
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64 $(window).unbind('.digilib'); // unbinds all digilibs(?)
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604
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65 data.digilib.remove();
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66 $this.removeData('digilib');
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67 });
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68 }
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605
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69 };
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604
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70
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608
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71 // returns parameters from page url
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607
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72 var parseQueryParams = function() {
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73 return parseQueryString(location.search.slice(1));
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74 };
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75
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608
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76 // returns parameters taken from embedded img-element
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607
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77 var parseImgParams = function($elem) {
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78 var src = $elem.children('img').attr('src');
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79 var pos = src.indexOf('?');
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80 var query = (pos < 0) ? '' : src.substring(pos + 1);
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81 var scalerUrl = src.substring(0, pos);
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82 var hash = parseQueryString(query);
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609
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83 hash.scalerBaseUrl = scalerUrl;
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607
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84 // console.log(hash);
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85 return hash;
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86 };
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87
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608
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88 // parses query parameter string into parameter object
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607
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89 var parseQueryString = function(query) {
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90 var pairs = query.split("&");
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91 var hash = {};
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92 for (var i = 0; i < pairs.length; i++) {
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93 var pair = pairs[i].split("=");
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94 if (pair.length === 2) {
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608
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95 hash[pair[0]] = pair[1];
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607
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96 };
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97 };
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98 return hash;
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99 };
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100
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608
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101 // returns URL and query string for Scaler
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102 var getScalerString = function (settings) {
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609
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103 var url = settings.scalerBaseUrl + '?';
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104 var i, parm, latter;
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105 // go through param names and get values from settings
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106 for (i = 0; i < settings.scalerParamNames.length; ++i) {
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107 parm = settings.scalerParamNames[i];
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108 if (settings[parm]) {
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109 // first parm gets no '&'
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110 url += latter ? '&' : '';
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111 latter = 1;
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112 // add parm=val
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113 url += parm + '=' + settings[parm];
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114 }
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115 }
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116 return url;
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117 };
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118
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119 // returns maximum size for scaler img in fullscreen mode
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120 var getFullscreenImgSize = function($elem) {
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121 var winH = $(window).height();
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122 var winW = $(window).width();
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123 // TODO: account for borders?
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124 return geom.size(winW, winH);
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608
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125 };
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126
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127 // creates HTML structure for digilib in elem
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128 var setupScalerDiv = function ($elem, settings) {
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129 if (settings.interactionMode === 'fullscreen') {
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609
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130 // fullscreen
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131 var imgSize = getFullscreenImgSize($elem);
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132 settings.dw = imgSize.width;
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133 settings.dh = imgSize.height;
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134 // create new html
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608
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135 $elem.empty(); // TODO: should we keep stuff for customization?
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609
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136 var scalerUrl = getScalerString(settings);
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608
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137 var scalerHTML = '<div class="scaler"><img class="pic"/></div>';
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609
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138 $elem.append(scalerHTML);
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139 var $img = $elem.find("img.pic");
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140 $img.attr('src', scalerUrl);
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141 //$img.load(scalerImgLoaded);
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142 } else {
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143 // embedded mode -- keep inner img
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144 var $img = $elem.detach('img');
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145 $elem.empty(); // TODO: should we keep stuff for customization?
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146 $img.addClass('pic');
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147 var $scaler = $('<div class="scaler"/>');
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148 $scaler.append($img);
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149 $elem.append($scaler);
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150 //$img.load(scalerImgLoaded);
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608
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151 }
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152 };
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153
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605
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154 // hook plugin into jquery
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155 $.fn.digilib = function(method) {
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156 if (methods[method]) {
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157 return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
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158 } else if (typeof(method) === 'object' || !method) {
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159 return methods.init.apply(this, arguments);
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160 } else {
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161 $.error( 'Method ' + method + ' does not exist on jQuery.digilib' );
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162 }
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163 };
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604
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164
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165 })(jQuery); |
