src/attributes.js

   1 jQuery.fn.extend({
   2         attr: function( name, value ) {
   3                 var elem, options, isFunction = jQuery.isFunction(value);
   4
   5                 if ( typeof name === "string" ) {     // A single attribute
   6                         if ( value === undefined ) {        // Query it on first element
   7                                 return this.length ?
   8                                         jQuery.attr( this[0], name ) :
   9                                         null;
  10                         } else {                            // Set it on all elements
  11                                 for ( var i = 0, l = this.length; i < l; i++ ) {
  12                                         elem = this[i];
  13                                         if ( isFunction )
  14                                                 value = value.call(elem,i);
  15                                         jQuery.attr( elem, name, value );
  16                                 }
  17                         }
  18                 } else {                              // Multiple attributes to set on all
  19                         options = name;
  20                         for ( var i = 0, l = this.length; i < l; i++ ) {
  21                                 elem = this[i];
  22                                 for ( name in options ) {
  23                                         value = options[name];
  24                                         if ( jQuery.isFunction(value) )
  25                                                 value = value.call(elem,i);
  26                                         jQuery.attr( elem, name, value );
  27                                 }
  28                         }
  29                 }
  30
  31                 return this;
  32         },
  33
  34         hasClass: function( selector ) {
  35                 return !!selector && this.is( "." + selector );
  36         },
  37
  38         val: function( value ) {
  39                 if ( value === undefined ) {
  40                         var elem = this[0];
  41
  42                         if ( elem ) {
  43                                 if( jQuery.nodeName( elem, 'option' ) )
  44                                         return (elem.attributes.value || {}).specified ? elem.value : elem.text;
  45
  46                                 // We need to handle select boxes special
  47                                 if ( jQuery.nodeName( elem, "select" ) ) {
  48                                         var index = elem.selectedIndex,
  49                                                 values = [],
  50                                                 options = elem.options,
  51                                                 one = elem.type == "select-one";
  52
  53                                         // Nothing was selected
  54                                         if ( index < 0 )
  55                                                 return null;
  56
  57                                         // Loop through all the selected options
  58                                         for ( var i = one ? index : 0, max = one ? index + 1 : options.length; i < max; i++ ) {
  59                                                 var option = options[ i ];
  60
  61                                                 if ( option.selected ) {
  62                                                         // Get the specifc value for the option
  63                                                         value = jQuery(option).val();
  64
  65                                                         // We don't need an array for one selects
  66                                                         if ( one )
  67                                                                 return value;
  68
  69                                                         // Multi-Selects return an array
  70                                                         values.push( value );
  71                                                 }
  72                                         }
  73
  74                                         return values;
  75                                 }
  76
  77                                 // Everything else, we just grab the value
  78                                 return (elem.value || "").replace(/\r/g, "");
  79
  80                         }
  81
  82                         return undefined;
  83                 }
  84
  85                 // Typecast once if the value is a number
  86                 if ( typeof value === "number" )
  87                         value += '';
  88
  89                 var val = value;
  90
  91                 return this.each(function(){
  92                         if(jQuery.isFunction(value)) {
  93                                 val = value.call(this);
  94                                 // Typecast each time if the value is a Function and the appended
  95                                 // value is therefore different each time.
  96                                 if( typeof val === "number" ) val += '';
  97                         }
  98
  99                         if ( this.nodeType != 1 )
 100                                 return;
 101
 102                         if ( jQuery.isArray(val) && /radio|checkbox/.test( this.type ) )
 103                                 this.checked = jQuery.inArray(this.value || this.name, val) >= 0;
 104
 105                         else if ( jQuery.nodeName( this, "select" ) ) {
 106                                 var values = jQuery.makeArray(val);
 107
 108                                 jQuery( "option", this ).each(function(){
 109                                         this.selected = jQuery.inArray( this.value || this.text, values ) >= 0;
 110                                 });
 111
 112                                 if ( !values.length )
 113                                         this.selectedIndex = -1;
 114
 115                         } else
 116                                 this.value = val;
 117                 });
 118         }
 119 });
 120
 121 jQuery.each({
 122         removeAttr: function( name ) {
 123                 jQuery.attr( this, name, "" );
 124                 if (this.nodeType == 1)
 125                         this.removeAttribute( name );
 126         },
 127
 128         addClass: function( classNames ) {
 129                 jQuery.className.add( this, classNames );
 130         },
 131
 132         removeClass: function( classNames ) {
 133                 jQuery.className.remove( this, classNames );
 134         },
 135
 136         toggleClass: function( classNames, state ) {
 137                 var type = typeof classNames;
 138                 if ( type === "string" ) {
 139                         // toggle individual class names
 140                         var isBool = typeof state === "boolean", className, i = 0,
 141                                 classNames = classNames.split( /\s+/ );
 142                         while ( (className = classNames[ i++ ]) ) {
 143                                 // check each className given, space seperated list
 144                                 state = isBool ? state : !jQuery.className.has( this, className );
 145                                 jQuery.className[ state ? "add" : "remove" ]( this, className );
 146                         }
 147                 } else if ( type === "undefined" || type === "boolean" ) {
 148                         if ( this.className ) {
 149                                 // store className if set
 150                                 jQuery.data( this, "__className__", this.className );
 151                         }
 152                         // toggle whole className
 153                         this.className = this.className || classNames === false ? "" : jQuery.data( this, "__className__" ) || "";
 154                 }
 155         }
 156 }, function(name, fn){
 157         jQuery.fn[ name ] = function(){
 158                 return this.each( fn, arguments );
 159         };
 160 });
 161
 162 jQuery.extend({
 163         className: {
 164                 // internal only, use addClass("class")
 165                 add: function( elem, classNames ) {
 166                         jQuery.each((classNames || "").split(/\s+/), function(i, className){
 167                                 if ( elem.nodeType == 1 && !jQuery.className.has( elem.className, className ) )
 168                                         elem.className += (elem.className ? " " : "") + className;
 169                         });
 170                 },
 171
 172                 // internal only, use removeClass("class")
 173                 remove: function( elem, classNames ) {
 174                         if (elem.nodeType == 1)
 175                                 elem.className = classNames !== undefined ?
 176                                         jQuery.grep(elem.className.split(/\s+/), function(className){
 177                                                 return !jQuery.className.has( classNames, className );
 178                                         }).join(" ") :
 179                                         "";
 180                 },
 181
 182                 // internal only, use hasClass("class")
 183                 has: function( elem, className ) {
 184                         return elem && jQuery.inArray( className, (elem.className || elem).toString().split(/\s+/) ) > -1;
 185                 }
 186         },
 187
 188         attr: function( elem, name, value ) {
 189                 // don't set attributes on text and comment nodes
 190                 if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
 191                         return undefined;
 192
 193                 var notxml = elem.nodeType !== 1 || !jQuery.isXMLDoc( elem ),
 194                         // Whether we are setting (or getting)
 195                         set = value !== undefined;
 196
 197                 // Try to normalize/fix the name
 198                 name = notxml && jQuery.props[ name ] || name;
 199
 200                 // Only do all the following if this is a node (faster for style)
 201                 if ( elem.nodeType === 1 ) {
 202
 203                         // These attributes require special treatment
 204                         var special = /href|src|style/.test( name );
 205
 206                         // Safari mis-reports the default selected property of a hidden option
 207                         // Accessing the parent's selectedIndex property fixes it
 208                         if ( name == "selected" && elem.parentNode )
 209                                 elem.parentNode.selectedIndex;
 210
 211                         // If applicable, access the attribute via the DOM 0 way
 212                         if ( name in elem && notxml && !special ) {
 213                                 if ( set ){
 214                                         // We can't allow the type property to be changed (since it causes problems in IE)
 215                                         if ( name == "type" && /(button|input)/i.test(elem.nodeName) && elem.parentNode )
 216                                                 throw "type property can't be changed";
 217
 218                                         elem[ name ] = value;
 219                                 }
 220
 221                                 // browsers index elements by id/name on forms, give priority to attributes.
 222                                 if( jQuery.nodeName( elem, "form" ) && elem.getAttributeNode(name) )
 223                                         return elem.getAttributeNode( name ).nodeValue;
 224
 225                                 // elem.tabIndex doesn't always return the correct value when it hasn't been explicitly set
 226                                 // http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/
 227                                 if ( name == "tabIndex" ) {
 228                                         var attributeNode = elem.getAttributeNode( "tabIndex" );
 229                                         return attributeNode && attributeNode.specified
 230                                                 ? attributeNode.value
 231                                                 : /(button|input|object|select|textarea)/i.test(elem.nodeName)
 232                                                         ? 0
 233                                                         : /^(a|area)$/i.test(elem.nodeName) && elem.href
 234                                                                 ? 0
 235                                                                 : undefined;
 236                                 }
 237
 238                                 return elem[ name ];
 239                         }
 240
 241                         if ( !jQuery.support.style && notxml && name == "style" ) {
 242                                 if ( set )
 243                                         elem.style.cssText = "" + value;
 244
 245                                 return elem.style.cssText;
 246                         }
 247
 248                         if ( set )
 249                                 // convert the value to a string (all browsers do this but IE) see #1070
 250                                 elem.setAttribute( name, "" + value );
 251
 252                         var attr = !jQuery.support.hrefNormalized && notxml && special
 253                                         // Some attributes require a special call on IE
 254                                         ? elem.getAttribute( name, 2 )
 255                                         : elem.getAttribute( name );
 256
 257                         // Non-existent attributes return null, we normalize to undefined
 258                         return attr === null ? undefined : attr;
 259                 }
 260
 261                 // elem is actually elem.style ... set the style
 262                 // Using attr for specific style information is now deprecated. Use style insead.
 263                 return jQuery.style(elem, name, value);
 264         }
 265 });