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 jQuery.css( elem, name, value );
  25         });
  26 };
  27
  28 jQuery.extend({
  29         cssHooks: {
  30                 opacity: {
  31                         get: function( elem ) {
  32                                 // We should always get a number back from opacity
  33                                 var ret = curCSS( elem, "opacity", "opacity" );
  34                                 return ret === "" ? "1" : ret;
  35                         }
  36                 }
  37         },
  38
  39         // exclude the following css properties to add px
  40         cssNumber: {
  41                 "zIndex": true,
  42                 "fontWeight": true,
  43                 "opacity": true,
  44                 "zoom": true,
  45                 "lineHeight": true
  46         },
  47
  48         cssProps: {
  49                 // normalize float css property
  50                 "float": jQuery.support.cssFloat ? "cssFloat" : "styleFloat"
  51         },
  52
  53         css: function( elem, name, value, force, extra ) {
  54                 // don't set styles on text and comment nodes
  55                 if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 ) {
  56                         return undefined;
  57                 }
  58
  59                 var ret, origName = name.replace( rdashAlpha, fcamelCase ),
  60                         style = elem.style || {}, hooks = jQuery.cssHooks[ origName ] || {};
  61
  62                 name = jQuery.cssProps[ origName ] || origName;
  63
  64                 if ( value !== undefined ) {
  65                         if ( typeof value === "number" && !jQuery.cssNumber[ origName ] ) {
  66                                 value += "px";
  67                         }
  68
  69                         if ( !("set" in hooks) || (value = hooks.set( elem, value )) !== undefined ) {
  70                                 style[ name ] = value;
  71                         }
  72
  73                 } else {
  74                         if ( !force && "get" in hooks && (ret = hooks.get( elem, force, extra )) !== undefined ) {
  75                                 return ret;
  76
  77                         } else if ( !force && style[ name ] ) {
  78                                 ret = style[ name ];
  79
  80                         } else if ( curCSS ) {
  81                                 ret = curCSS( elem, name, origName );
  82                         }
  83
  84                         return ret;
  85                 }
  86         },
  87
  88         // A method for quickly swapping in/out CSS properties to get correct calculations
  89         swap: function( elem, options, callback ) {
  90                 var old = {};
  91
  92                 // Remember the old values, and insert the new ones
  93                 for ( var name in options ) {
  94                         old[ name ] = elem.style[ name ];
  95                         elem.style[ name ] = options[ name ];
  96                 }
  97
  98                 callback.call( elem );
  99
 100                 // Revert the old values
 101                 for ( name in options ) {
 102                         elem.style[ name ] = old[ name ];
 103                 }
 104         }
 105 });
 106
 107 jQuery.each(["height", "width"], function( i, name ) {
 108         jQuery.cssHooks[ name ] = {
 109                 get: function( elem, force, extra ) {
 110                         var val;
 111
 112                         if ( elem.offsetWidth !== 0 ) {
 113                                 val = getWH( elem, name, extra );
 114
 115                         } else {
 116                                 jQuery.swap( elem, cssShow, function() {
 117                                         val = getWH( elem, name, extra );
 118                                 });
 119                         }
 120
 121                         return val + "px";
 122                 },
 123
 124                 set: function( elem, value ) {
 125                         // ignore negative width and height values #1599
 126                         return Math.max( parseFloat(value), 0 ) + "px";
 127                 }
 128         };
 129 });
 130
 131 if ( !jQuery.support.opacity ) {
 132         jQuery.cssHooks.opacity = {
 133                 get: function( elem, force ) {
 134                         // IE uses filters for opacity
 135                         return ropacity.test(elem.currentStyle.filter || "") ?
 136                                 (parseFloat(RegExp.$1) / 100) + "" :
 137                                 "1";
 138                 },
 139
 140                 set: function( elem, value ) {
 141                         var style = elem.style;
 142
 143                         // IE has trouble with opacity if it does not have layout
 144                         // Force it by setting the zoom level
 145                         style.zoom = 1;
 146
 147                         // Set the alpha filter to set the opacity
 148                         var opacity = parseInt( value, 10 ) + "" === "NaN" ?
 149                                 "" :
 150                                 "alpha(opacity=" + value * 100 + ")";
 151
 152                         var filter = style.filter || jQuery.css( elem, "filter" ) || "";
 153
 154                         style.filter = ralpha.test(filter) ?
 155                                 filter.replace(ralpha, opacity) :
 156                                 opacity;
 157                 }
 158         };
 159 }
 160
 161 if ( getComputedStyle ) {
 162         curCSS = function( elem, newName, name ) {
 163                 var ret, defaultView, computedStyle;
 164
 165                 name = name.replace( rupper, "-$1" ).toLowerCase();
 166
 167                 if ( !(defaultView = elem.ownerDocument.defaultView) ) {
 168                         return undefined;
 169                 }
 170
 171                 if ( (computedStyle = defaultView.getComputedStyle( elem, null )) ) {
 172                         ret = computedStyle.getPropertyValue( name );
 173                 }
 174
 175                 return ret;
 176         };
 177
 178 } else if ( document.documentElement.currentStyle ) {
 179         curCSS = function( elem, name ) {
 180                 var left, rsLeft, ret = elem.currentStyle[ name ], style = elem.style;
 181
 182                 // From the awesome hack by Dean Edwards
 183                 // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 184
 185                 // If we're not dealing with a regular pixel number
 186                 // but a number that has a weird ending, we need to convert it to pixels
 187                 if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 188                         // Remember the original values
 189                         left = style.left;
 190                         rsLeft = elem.runtimeStyle.left;
 191
 192                         // Put in the new values to get a computed value out
 193                         elem.runtimeStyle.left = elem.currentStyle.left;
 194                         style.left = name === "fontSize" ? "1em" : (ret || 0);
 195                         ret = style.pixelLeft + "px";
 196
 197                         // Revert the changed values
 198                         style.left = left;
 199                         elem.runtimeStyle.left = rsLeft;
 200                 }
 201
 202                 return ret;
 203         };
 204 }
 205
 206 function getWH( elem, name, extra ) {
 207         var which = name === "width" ? cssWidth : cssHeight,
 208                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 209
 210         if ( extra === "border" ) {
 211                 return val;
 212         }
 213
 214         jQuery.each( which, function() {
 215                 if ( !extra ) {
 216                         val -= parseFloat(jQuery.css( elem, "padding" + this, undefined, true )) || 0;
 217                 }
 218
 219                 if ( extra === "margin" ) {
 220                         val += parseFloat(jQuery.css( elem, "margin" + this, undefined, true )) || 0;
 221
 222                 } else {
 223                         val -= parseFloat(jQuery.css( elem, "border" + this + "Width", undefined, true )) || 0;
 224                 }
 225         });
 226
 227         return val;
 228 }
 229
 230 if ( jQuery.expr && jQuery.expr.filters ) {
 231         jQuery.expr.filters.hidden = function( elem ) {
 232                 var width = elem.offsetWidth, height = elem.offsetHeight,
 233                         skip = elem.nodeName.toLowerCase() === "tr";
 234
 235                 return width === 0 && height === 0 && !skip ?
 236                         true :
 237                         width > 0 && height > 0 && !skip ?
 238                                 false :
 239                                 jQuery.css(elem, "display") === "none";
 240         };
 241
 242         jQuery.expr.filters.visible = function( elem ) {
 243                 return !jQuery.expr.filters.hidden( elem );
 244         };
 245 }
 246
 247 })( jQuery );