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