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