src/css.js

   1 (function( jQuery ) {
   2
   3 var ralpha = /alpha\([^)]*\)/,
   4         ropacity = /opacity=([^)]*)/,
   5         rdashAlpha = /-([a-z])/ig,
   6         rupper = /([A-Z])/g,
   7         rnumpx = /^-?\d+(?:px)?$/i,
   8         rnum = /^-?\d/,
   9
  10         cssShow = { position: "absolute", visibility: "hidden", display: "block" },
  11         cssWidth = [ "Left", "Right" ],
  12         cssHeight = [ "Top", "Bottom" ],
  13         curCSS,
  14
  15         // cache check for defaultView.getComputedStyle
  16         getComputedStyle = document.defaultView && document.defaultView.getComputedStyle,
  17
  18         fcamelCase = function( all, letter ) {
  19                 return letter.toUpperCase();
  20         };
  21
  22 jQuery.fn.css = function( name, value ) {
  23         return jQuery.access( this, name, value, true, function( elem, name, value ) {
  24                 return value !== undefined ?
  25                         jQuery.style( elem, name, value ) :
  26                         jQuery.css( elem, name );
  27         });
  28 };
  29
  30 jQuery.extend({
  31         // Add in style property hooks for overriding the default
  32         // behavior of getting and setting a style property
  33         cssHooks: {
  34                 opacity: {
  35                         get: function( elem, computed ) {
  36                                 if ( computed ) {
  37                                         // We should always get a number back from opacity
  38                                         var ret = curCSS( elem, "opacity", "opacity" );
  39                                         return ret === "" ? "1" : ret;
  40
  41                                 } else {
  42                                         return elem.style.opacity;
  43                                 }
  44                         }
  45                 }
  46         },
  47
  48         // Exclude the following css properties to add px
  49         cssNumber: {
  50                 "zIndex": true,
  51                 "fontWeight": true,
  52                 "opacity": true,
  53                 "zoom": true,
  54                 "lineHeight": true
  55         },
  56
  57         // Add in properties whose names you wish to fix before
  58         // setting or getting the value
  59         cssProps: {
  60                 // normalize float css property
  61                 "float": jQuery.support.cssFloat ? "cssFloat" : "styleFloat"
  62         },
  63
  64         // Get and set the style property on a DOM Node
  65         style: function( elem, name, value, extra ) {
  66                 // Don't set styles on text and comment nodes
  67                 if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
  68                         return undefined;
  69                 }
  70
  71                 // Make sure that we're working with the right name
  72                 var ret, origName = jQuery.camelCase( name ),
  73                         style = elem.style, hooks = jQuery.cssHooks[ origName ];
  74
  75                 name = jQuery.cssProps[ origName ] || origName;
  76
  77                 // Check if we're setting a value
  78                 if ( value !== undefined ) {
  79                         // If a number was passed in, add 'px' to the (except for certain CSS properties)
  80                         if ( typeof value === "number" && !jQuery.cssNumber[ origName ] ) {
  81                                 value += "px";
  82                         }
  83
  84                         // If a hook was provided, use that value, otherwise just set the specified value
  85                         if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value )) !== undefined ) {
  86                                 style[ name ] = value;
  87                         }
  88
  89                 } else {
  90                         // If a hook was provided get the non-computed value from there
  91                         if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
  92                                 return ret;
  93                         }
  94
  95                         // Otherwise just get the value from the style object
  96                         return style[ name ];
  97                 }
  98         },
  99
 100         css: function( elem, name, extra ) {
 101                 // Make sure that we're working with the right name
 102                 var ret, origName = jQuery.camelCase( name ),
 103                         hooks = jQuery.cssHooks[ origName ];
 104
 105                 name = jQuery.cssProps[ origName ] || origName;
 106
 107                 // If a hook was provided get the computed value from there
 108                 if ( hooks && "get" in hooks && (ret = hooks.get( elem, true, extra )) !== undefined ) {
 109                         return ret;
 110
 111                 // Otherwise, if a way to get the computed value exists, use that
 112                 } else if ( curCSS ) {
 113                         return curCSS( elem, name, origName );
 114                 }
 115         },
 116
 117         // A method for quickly swapping in/out CSS properties to get correct calculations
 118         swap: function( elem, options, callback ) {
 119                 var old = {};
 120
 121                 // Remember the old values, and insert the new ones
 122                 for ( var name in options ) {
 123                         old[ name ] = elem.style[ name ];
 124                         elem.style[ name ] = options[ name ];
 125                 }
 126
 127                 callback.call( elem );
 128
 129                 // Revert the old values
 130                 for ( name in options ) {
 131                         elem.style[ name ] = old[ name ];
 132                 }
 133         },
 134
 135         camelCase: function( string ) {
 136                 return string.replace( rdashAlpha, fcamelCase );
 137         }
 138 });
 139
 140 // DEPRECATED, Use jQuery.css() instead
 141 jQuery.curCSS = jQuery.css;
 142
 143 jQuery.each(["height", "width"], function( i, name ) {
 144         jQuery.cssHooks[ name ] = {
 145                 get: function( elem, computed, extra ) {
 146                         var val;
 147
 148                         if ( computed ) {
 149                                 if ( elem.offsetWidth !== 0 ) {
 150                                         val = getWH( elem, name, extra );
 151
 152                                 } else {
 153                                         jQuery.swap( elem, cssShow, function() {
 154                                                 val = getWH( elem, name, extra );
 155                                         });
 156                                 }
 157
 158                                 return val + "px";
 159                         }
 160                 },
 161
 162                 set: function( elem, value ) {
 163                         if ( rnumpx.test( value ) ) {
 164                                 // ignore negative width and height values #1599
 165                                 value = parseFloat(value);
 166
 167                                 if ( value >= 0 ) {
 168                                         return value + "px";
 169                                 }
 170
 171                         } else {
 172                                 return value;
 173                         }
 174                 }
 175         };
 176 });
 177
 178 if ( !jQuery.support.opacity ) {
 179         jQuery.cssHooks.opacity = {
 180                 get: function( elem, computed ) {
 181                         // IE uses filters for opacity
 182                         return ropacity.test((computed && elem.currentStyle ? elem.currentStyle.filter : elem.style.filter) || "") ?
 183                                 (parseFloat(RegExp.$1) / 100) + "" :
 184                                 computed ? "1" : "";
 185                 },
 186
 187                 set: function( elem, value ) {
 188                         var style = elem.style;
 189
 190                         // IE has trouble with opacity if it does not have layout
 191                         // Force it by setting the zoom level
 192                         style.zoom = 1;
 193
 194                         // Set the alpha filter to set the opacity
 195                         var opacity = jQuery.isNaN(value) ?
 196                                 "" :
 197                                 "alpha(opacity=" + value * 100 + ")",
 198                                 filter = style.filter || "";
 199
 200                         style.filter = ralpha.test(filter) ?
 201                                 filter.replace(ralpha, opacity) :
 202                                 opacity;
 203                 }
 204         };
 205 }
 206
 207 if ( getComputedStyle ) {
 208         curCSS = function( elem, newName, name ) {
 209                 var ret, defaultView, computedStyle;
 210
 211                 name = name.replace( rupper, "-$1" ).toLowerCase();
 212
 213                 if ( !(defaultView = elem.ownerDocument.defaultView) ) {
 214                         return undefined;
 215                 }
 216
 217                 if ( (computedStyle = defaultView.getComputedStyle( elem, null )) ) {
 218                         ret = computedStyle.getPropertyValue( name );
 219                 }
 220
 221                 return ret;
 222         };
 223
 224 } else if ( document.documentElement.currentStyle ) {
 225         curCSS = function( elem, name ) {
 226                 var left, rsLeft, ret = elem.currentStyle && elem.currentStyle[ name ], style = elem.style;
 227
 228                 // From the awesome hack by Dean Edwards
 229                 // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 230
 231                 // If we're not dealing with a regular pixel number
 232                 // but a number that has a weird ending, we need to convert it to pixels
 233                 if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 234                         // Remember the original values
 235                         left = style.left;
 236                         rsLeft = elem.runtimeStyle.left;
 237
 238                         // Put in the new values to get a computed value out
 239                         elem.runtimeStyle.left = elem.currentStyle.left;
 240                         style.left = name === "fontSize" ? "1em" : (ret || 0);
 241                         ret = style.pixelLeft + "px";
 242
 243                         // Revert the changed values
 244                         style.left = left;
 245                         elem.runtimeStyle.left = rsLeft;
 246                 }
 247
 248                 return ret;
 249         };
 250 }
 251
 252 function getWH( elem, name, extra ) {
 253         var which = name === "width" ? cssWidth : cssHeight,
 254                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 255
 256         if ( extra === "border" ) {
 257                 return val;
 258         }
 259
 260         jQuery.each( which, function() {
 261                 if ( !extra ) {
 262                         val -= parseFloat(jQuery.css( elem, "padding" + this )) || 0;
 263                 }
 264
 265                 if ( extra === "margin" ) {
 266                         val += parseFloat(jQuery.css( elem, "margin" + this )) || 0;
 267
 268                 } else {
 269                         val -= parseFloat(jQuery.css( elem, "border" + this + "Width" )) || 0;
 270                 }
 271         });
 272
 273         return val;
 274 }
 275
 276 if ( jQuery.expr && jQuery.expr.filters ) {
 277         jQuery.expr.filters.hidden = function( elem ) {
 278                 var width = elem.offsetWidth, height = elem.offsetHeight,
 279                         skip = elem.nodeName.toLowerCase() === "tr";
 280
 281                 return width === 0 && height === 0 && !skip ?
 282                         true :
 283                         width > 0 && height > 0 && !skip ?
 284                                 false :
 285                                 (elem.style.display || jQuery.css( elem, "display" )) === "none";
 286         };
 287
 288         jQuery.expr.filters.visible = function( elem ) {
 289                 return !jQuery.expr.filters.hidden( elem );
 290         };
 291 }
 292
 293 })( jQuery );