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1 define( [
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2 "./core",
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3 "./core/access",
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4 "./core/camelCase",
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5 "./data/var/dataPriv",
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6 "./data/var/dataUser"
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7 ], function( jQuery, access, camelCase, dataPriv, dataUser ) {
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8
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9 "use strict";
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10
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11 // Implementation Summary
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12 //
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13 // 1. Enforce API surface and semantic compatibility with 1.9.x branch
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14 // 2. Improve the module's maintainability by reducing the storage
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15 // paths to a single mechanism.
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16 // 3. Use the same single mechanism to support "private" and "user" data.
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17 // 4. _Never_ expose "private" data to user code (TODO: Drop _data, _removeData)
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18 // 5. Avoid exposing implementation details on user objects (eg. expando properties)
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19 // 6. Provide a clear path for implementation upgrade to WeakMap in 2014
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20
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21 var rbrace = /^(?:\{[\w\W]*\}|\[[\w\W]*\])$/,
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22 rmultiDash = /[A-Z]/g;
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23
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24 function getData( data ) {
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25 if ( data === "true" ) {
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26 return true;
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27 }
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28
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29 if ( data === "false" ) {
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30 return false;
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31 }
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32
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33 if ( data === "null" ) {
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34 return null;
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35 }
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36
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37 // Only convert to a number if it doesn't change the string
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38 if ( data === +data + "" ) {
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39 return +data;
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40 }
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41
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42 if ( rbrace.test( data ) ) {
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43 return JSON.parse( data );
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44 }
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45
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46 return data;
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47 }
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48
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49 function dataAttr( elem, key, data ) {
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50 var name;
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51
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52 // If nothing was found internally, try to fetch any
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53 // data from the HTML5 data-* attribute
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54 if ( data === undefined && elem.nodeType === 1 ) {
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55 name = "data-" + key.replace( rmultiDash, "-$&" ).toLowerCase();
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56 data = elem.getAttribute( name );
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57
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58 if ( typeof data === "string" ) {
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59 try {
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60 data = getData( data );
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61 } catch ( e ) {}
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62
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63 // Make sure we set the data so it isn't changed later
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64 dataUser.set( elem, key, data );
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65 } else {
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66 data = undefined;
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67 }
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68 }
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69 return data;
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70 }
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71
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72 jQuery.extend( {
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73 hasData: function( elem ) {
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74 return dataUser.hasData( elem ) || dataPriv.hasData( elem );
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75 },
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76
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77 data: function( elem, name, data ) {
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78 return dataUser.access( elem, name, data );
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79 },
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80
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81 removeData: function( elem, name ) {
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82 dataUser.remove( elem, name );
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83 },
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84
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85 // TODO: Now that all calls to _data and _removeData have been replaced
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86 // with direct calls to dataPriv methods, these can be deprecated.
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87 _data: function( elem, name, data ) {
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88 return dataPriv.access( elem, name, data );
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89 },
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90
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91 _removeData: function( elem, name ) {
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92 dataPriv.remove( elem, name );
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93 }
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94 } );
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95
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96 jQuery.fn.extend( {
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97 data: function( key, value ) {
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98 var i, name, data,
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99 elem = this[ 0 ],
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100 attrs = elem && elem.attributes;
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101
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102 // Gets all values
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103 if ( key === undefined ) {
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104 if ( this.length ) {
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105 data = dataUser.get( elem );
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106
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107 if ( elem.nodeType === 1 && !dataPriv.get( elem, "hasDataAttrs" ) ) {
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108 i = attrs.length;
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109 while ( i-- ) {
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110
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111 // Support: IE 11 only
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112 // The attrs elements can be null (#14894)
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113 if ( attrs[ i ] ) {
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114 name = attrs[ i ].name;
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115 if ( name.indexOf( "data-" ) === 0 ) {
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116 name = camelCase( name.slice( 5 ) );
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117 dataAttr( elem, name, data[ name ] );
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118 }
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119 }
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120 }
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121 dataPriv.set( elem, "hasDataAttrs", true );
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122 }
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123 }
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124
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125 return data;
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126 }
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127
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128 // Sets multiple values
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129 if ( typeof key === "object" ) {
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130 return this.each( function() {
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131 dataUser.set( this, key );
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132 } );
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133 }
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134
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135 return access( this, function( value ) {
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136 var data;
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137
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138 // The calling jQuery object (element matches) is not empty
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139 // (and therefore has an element appears at this[ 0 ]) and the
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140 // `value` parameter was not undefined. An empty jQuery object
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141 // will result in `undefined` for elem = this[ 0 ] which will
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142 // throw an exception if an attempt to read a data cache is made.
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143 if ( elem && value === undefined ) {
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144
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145 // Attempt to get data from the cache
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146 // The key will always be camelCased in Data
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147 data = dataUser.get( elem, key );
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148 if ( data !== undefined ) {
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149 return data;
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150 }
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151
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152 // Attempt to "discover" the data in
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153 // HTML5 custom data-* attrs
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154 data = dataAttr( elem, key );
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155 if ( data !== undefined ) {
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156 return data;
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157 }
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158
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159 // We tried really hard, but the data doesn't exist.
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160 return;
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161 }
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162
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163 // Set the data...
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164 this.each( function() {
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165
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166 // We always store the camelCased key
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167 dataUser.set( this, key, value );
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168 } );
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169 }, null, value, arguments.length > 1, null, true );
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170 },
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171
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172 removeData: function( key ) {
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173 return this.each( function() {
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174 dataUser.remove( this, key );
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175 } );
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176 }
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177 } );
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178
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179 return jQuery;
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180 } );
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