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                 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 )) === false ) {
  70                                 style[ name ] = value;
  71                         }
  72
  73                 } else {
  74                         if ( "get" in hooks && (ret = hooks.get( elem, force, extra )) !== false ) {
  75                                 return ret;
  76                         }
  77
  78                         if ( !force && name in style ) {
  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                         if ( elem.offsetWidth !== 0 ) {
 112                                 val = getWH( elem, name, extra );
 113
 114                         } else {
 115                                 jQuery.swap( elem, cssShow, function() {
 116                                         val = getWH( elem, name, extra );
 117                                 });
 118                         }
 119                 },
 120
 121                 set: function( elem, value ) {
 122                         // ignore negative width and height values #1599
 123                         elem.style[ name ] = Math.max( parseFloat(value), 0 ) + "px";
 124                 }
 125         };
 126 });
 127
 128 if ( !jQuery.support.opacity ) {
 129         jQuery.cssHooks.opacity = {
 130                 get: function( elem, force ) {
 131                         // IE uses filters for opacity
 132                         return ropacity.test(elem.currentStyle.filter || "") ?
 133                                 (parseFloat(RegExp.$1) / 100) + "" :
 134                                 "1";
 135                 },
 136
 137                 set: function( elem, value ) {
 138                         var style = elem.style;
 139
 140                         // IE has trouble with opacity if it does not have layout
 141                         // Force it by setting the zoom level
 142                         style.zoom = 1;
 143
 144                         // Set the alpha filter to set the opacity
 145                         var opacity = parseInt( value, 10 ) + "" === "NaN" ?
 146                                 "" :
 147                                 "alpha(opacity=" + value * 100 + ")";
 148
 149                         var filter = style.filter || jQuery.css( elem, "filter" ) || "";
 150
 151                         style.filter = ralpha.test(filter) ?
 152                                 filter.replace(ralpha, opacity) :
 153                                 opacity;
 154                 }
 155         };
 156 }
 157
 158 if ( getComputedStyle ) {
 159         curCSS = function( elem, newName, name ) {
 160                 var ret, defaultView, computedStyle;
 161
 162                 name = name.replace( rupper, "-$1" ).toLowerCase();
 163
 164                 if ( !(defaultView = elem.ownerDocument.defaultView) ) {
 165                         return undefined;
 166                 }
 167
 168                 if ( (computedStyle = defaultView.getComputedStyle( elem, null )) ) {
 169                         ret = computedStyle.getPropertyValue( name );
 170                 }
 171
 172                 return ret;
 173         };
 174
 175 } else if ( document.documentElement.currentStyle ) {
 176         curCSS = function( elem, name ) {
 177                 var left, rsLeft, ret = elem.currentStyle[ name ];
 178
 179                 // From the awesome hack by Dean Edwards
 180                 // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 181
 182                 // If we're not dealing with a regular pixel number
 183                 // but a number that has a weird ending, we need to convert it to pixels
 184                 if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 185                         // Remember the original values
 186                         left = style.left;
 187                         rsLeft = elem.runtimeStyle.left;
 188
 189                         // Put in the new values to get a computed value out
 190                         elem.runtimeStyle.left = elem.currentStyle.left;
 191                         style.left = name === "fontSize" ? "1em" : (ret || 0);
 192                         ret = style.pixelLeft + "px";
 193
 194                         // Revert the changed values
 195                         style.left = left;
 196                         elem.runtimeStyle.left = rsLeft;
 197                 }
 198
 199                 return ret;
 200         };
 201 }
 202
 203 function getWH( elem, name, extra ) {
 204         var which = name === "width" ? cssWidth : cssHeight,
 205                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 206
 207         if ( extra === "border" ) {
 208                 return val;
 209         }
 210
 211         jQuery.each( which, function() {
 212                 if ( !extra ) {
 213                         val -= parseFloat(jQuery.css( elem, "padding" + this, undefined, true)) || 0;
 214                 }
 215
 216                 if ( extra === "margin" ) {
 217                         val += parseFloat(jQuery.css( elem, "margin" + this, undefined, true)) || 0;
 218
 219                 } else {
 220                         val -= parseFloat(jQuery.css( elem, "border" + this + "Width", undefined, true)) || 0;
 221                 }
 222         });
 223
 224         return val;
 225 }
 226
 227 if ( jQuery.expr && jQuery.expr.filters ) {
 228         jQuery.expr.filters.hidden = function( elem ) {
 229                 var width = elem.offsetWidth, height = elem.offsetHeight,
 230                         skip = elem.nodeName.toLowerCase() === "tr";
 231
 232                 return width === 0 && height === 0 && !skip ?
 233                         true :
 234                         width > 0 && height > 0 && !skip ?
 235                                 false :
 236                                 jQuery.css(elem, "display") === "none";
 237         };
 238
 239         jQuery.expr.filters.visible = function( elem ) {
 240                 return !jQuery.expr.filters.hidden( elem );
 241         };
 242 }
 243
 244 })( jQuery );