src/css.js

   1 (function( jQuery ) {
   2
   3 var ralpha = /alpha\([^)]*\)/i,
   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         // Setting 'undefined' is a no-op
  24         if ( arguments.length === 2 && value === undefined ) {
  25                 return this;
  26         }
  27
  28         return jQuery.access( this, name, value, true, function( elem, name, value ) {
  29                 return value !== undefined ?
  30                         jQuery.style( elem, name, value ) :
  31                         jQuery.css( elem, name );
  32         });
  33 };
  34
  35 jQuery.extend({
  36         // Add in style property hooks for overriding the default
  37         // behavior of getting and setting a style property
  38         cssHooks: {
  39                 opacity: {
  40                         get: function( elem, computed ) {
  41                                 if ( computed ) {
  42                                         // We should always get a number back from opacity
  43                                         var ret = curCSS( elem, "opacity", "opacity" );
  44                                         return ret === "" ? "1" : ret;
  45
  46                                 } else {
  47                                         return elem.style.opacity;
  48                                 }
  49                         }
  50                 }
  51         },
  52
  53         // Exclude the following css properties to add px
  54         cssNumber: {
  55                 "zIndex": true,
  56                 "fontWeight": true,
  57                 "opacity": true,
  58                 "zoom": true,
  59                 "lineHeight": true
  60         },
  61
  62         // Add in properties whose names you wish to fix before
  63         // setting or getting the value
  64         cssProps: {
  65                 // normalize float css property
  66                 "float": jQuery.support.cssFloat ? "cssFloat" : "styleFloat"
  67         },
  68
  69         // Get and set the style property on a DOM Node
  70         style: function( elem, name, value, extra ) {
  71                 // Don't set styles on text and comment nodes
  72                 if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
  73                         return;
  74                 }
  75
  76                 // Make sure that we're working with the right name
  77                 var ret, origName = jQuery.camelCase( name ),
  78                         style = elem.style, hooks = jQuery.cssHooks[ origName ];
  79
  80                 name = jQuery.cssProps[ origName ] || origName;
  81
  82                 // Check if we're setting a value
  83                 if ( value !== undefined ) {
  84                         // Make sure that NaN and null values aren't set. See: #7116
  85                         if ( typeof value === "number" && isNaN( value ) || value == null ) {
  86                                 return;
  87                         }
  88
  89                         // If a number was passed in, add 'px' to the (except for certain CSS properties)
  90                         if ( typeof value === "number" && !jQuery.cssNumber[ origName ] ) {
  91                                 value += "px";
  92                         }
  93
  94                         // If a hook was provided, use that value, otherwise just set the specified value
  95                         if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value )) !== undefined ) {
  96                                 // Wrapped to prevent IE from throwing errors when 'invalid' values are provided
  97                                 // Fixes bug #5509
  98                                 try {
  99                                         style[ name ] = value;
 100                                 } catch(e) {}
 101                         }
 102
 103                 } else {
 104                         // If a hook was provided get the non-computed value from there
 105                         if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
 106                                 return ret;
 107                         }
 108
 109                         // Otherwise just get the value from the style object
 110                         return style[ name ];
 111                 }
 112         },
 113
 114         css: function( elem, name, extra ) {
 115                 // Make sure that we're working with the right name
 116                 var ret, origName = jQuery.camelCase( name ),
 117                         hooks = jQuery.cssHooks[ origName ];
 118
 119                 name = jQuery.cssProps[ origName ] || origName;
 120
 121                 // If a hook was provided get the computed value from there
 122                 if ( hooks && "get" in hooks && (ret = hooks.get( elem, true, extra )) !== undefined ) {
 123                         return ret;
 124
 125                 // Otherwise, if a way to get the computed value exists, use that
 126                 } else if ( curCSS ) {
 127                         return curCSS( elem, name, origName );
 128                 }
 129         },
 130
 131         // A method for quickly swapping in/out CSS properties to get correct calculations
 132         swap: function( elem, options, callback ) {
 133                 var old = {};
 134
 135                 // Remember the old values, and insert the new ones
 136                 for ( var name in options ) {
 137                         old[ name ] = elem.style[ name ];
 138                         elem.style[ name ] = options[ name ];
 139                 }
 140
 141                 callback.call( elem );
 142
 143                 // Revert the old values
 144                 for ( name in options ) {
 145                         elem.style[ name ] = old[ name ];
 146                 }
 147         },
 148
 149         camelCase: function( string ) {
 150                 return string.replace( rdashAlpha, fcamelCase );
 151         }
 152 });
 153
 154 // DEPRECATED, Use jQuery.css() instead
 155 jQuery.curCSS = jQuery.css;
 156
 157 jQuery.each(["height", "width"], function( i, name ) {
 158         jQuery.cssHooks[ name ] = {
 159                 get: function( elem, computed, extra ) {
 160                         var val;
 161
 162                         if ( computed ) {
 163                                 if ( elem.offsetWidth !== 0 ) {
 164                                         val = getWH( elem, name, extra );
 165
 166                                 } else {
 167                                         jQuery.swap( elem, cssShow, function() {
 168                                                 val = getWH( elem, name, extra );
 169                                         });
 170                                 }
 171
 172                                 if ( val <= 0 ) {
 173                                         val = curCSS( elem, name, name );
 174
 175                                         if ( val != null ) {
 176                                                 return val;
 177                                         }
 178                                 }
 179
 180                                 if ( val < 0 || val == null ) {
 181                                         val = elem.style[ name ];
 182                                         return val === "" ? "auto" : val;
 183                                 }
 184
 185                                 return typeof val === "string" ? val : val + "px";
 186                         }
 187                 },
 188
 189                 set: function( elem, value ) {
 190                         if ( rnumpx.test( value ) ) {
 191                                 // ignore negative width and height values #1599
 192                                 value = parseFloat(value);
 193
 194                                 if ( value >= 0 ) {
 195                                         return value + "px";
 196                                 }
 197
 198                         } else {
 199                                 return value;
 200                         }
 201                 }
 202         };
 203 });
 204
 205 if ( !jQuery.support.opacity ) {
 206         jQuery.cssHooks.opacity = {
 207                 get: function( elem, computed ) {
 208                         // IE uses filters for opacity
 209                         return ropacity.test((computed && elem.currentStyle ? elem.currentStyle.filter : elem.style.filter) || "") ?
 210                                 (parseFloat(RegExp.$1) / 100) + "" :
 211                                 computed ? "1" : "";
 212                 },
 213
 214                 set: function( elem, value ) {
 215                         var style = elem.style;
 216
 217                         // IE has trouble with opacity if it does not have layout
 218                         // Force it by setting the zoom level
 219                         style.zoom = 1;
 220
 221                         // Set the alpha filter to set the opacity
 222                         var opacity = jQuery.isNaN(value) ?
 223                                 "" :
 224                                 "alpha(opacity=" + value * 100 + ")",
 225                                 filter = style.filter || "";
 226
 227                         style.filter = ralpha.test(filter) ?
 228                                 filter.replace(ralpha, opacity) :
 229                                 style.filter + ' ' + opacity;
 230                 }
 231         };
 232 }
 233
 234 if ( getComputedStyle ) {
 235         curCSS = function( elem, newName, name ) {
 236                 var ret, defaultView, computedStyle;
 237
 238                 name = name.replace( rupper, "-$1" ).toLowerCase();
 239
 240                 if ( !(defaultView = elem.ownerDocument.defaultView) ) {
 241                         return undefined;
 242                 }
 243
 244                 if ( (computedStyle = defaultView.getComputedStyle( elem, null )) ) {
 245                         ret = computedStyle.getPropertyValue( name );
 246                         if ( ret === "" && !jQuery.contains( elem.ownerDocument.documentElement, elem ) ) {
 247                                 ret = jQuery.style( elem, name );
 248                         }
 249                 }
 250
 251                 return ret === "" ? "auto" : ret;
 252         };
 253
 254 } else if ( document.documentElement.currentStyle ) {
 255         curCSS = function( elem, name ) {
 256                 var left, rsLeft, ret = elem.currentStyle && elem.currentStyle[ name ], style = elem.style;
 257
 258                 // From the awesome hack by Dean Edwards
 259                 // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 260
 261                 // If we're not dealing with a regular pixel number
 262                 // but a number that has a weird ending, we need to convert it to pixels
 263                 if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 264                         // Remember the original values
 265                         left = style.left;
 266                         rsLeft = elem.runtimeStyle.left;
 267
 268                         // Put in the new values to get a computed value out
 269                         elem.runtimeStyle.left = elem.currentStyle.left;
 270                         style.left = name === "fontSize" ? "1em" : (ret || 0);
 271                         ret = style.pixelLeft + "px";
 272
 273                         // Revert the changed values
 274                         style.left = left;
 275                         elem.runtimeStyle.left = rsLeft;
 276                 }
 277
 278                 return ret === "" ? "auto" : ret;
 279         };
 280 }
 281
 282 function getWH( elem, name, extra ) {
 283         var which = name === "width" ? cssWidth : cssHeight,
 284                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 285
 286         if ( extra === "border" ) {
 287                 return val;
 288         }
 289
 290         jQuery.each( which, function() {
 291                 if ( !extra ) {
 292                         val -= parseFloat(jQuery.css( elem, "padding" + this )) || 0;
 293                 }
 294
 295                 if ( extra === "margin" ) {
 296                         val += parseFloat(jQuery.css( elem, "margin" + this )) || 0;
 297
 298                 } else {
 299                         val -= parseFloat(jQuery.css( elem, "border" + this + "Width" )) || 0;
 300                 }
 301         });
 302
 303         return val;
 304 }
 305
 306 if ( jQuery.expr && jQuery.expr.filters ) {
 307         jQuery.expr.filters.hidden = function( elem ) {
 308                 var width = elem.offsetWidth, height = elem.offsetHeight;
 309
 310                 return (width === 0 && height === 0) || (!jQuery.support.reliableHiddenOffsets && (elem.style.display || jQuery.css( elem, "display" )) === "none");
 311         };
 312
 313         jQuery.expr.filters.visible = function( elem ) {
 314                 return !jQuery.expr.filters.hidden( elem );
 315         };
 316 }
 317
 318 })( jQuery );