src/css.js

   1 var ralpha = /alpha\([^)]*\)/,
   2         ropacity = /opacity=([^)]*)/,
   3         rdashAlpha = /-([a-z])/ig,
   4         rupper = /([A-Z])/g,
   5         rnumpx = /^-?\d+(?:px)?$/i,
   6         rnum = /^-?\d/,
   7
   8         cssShow = { position: "absolute", visibility: "hidden", display: "block" },
   9         cssWidth = [ "Left", "Right" ],
  10         cssHeight = [ "Top", "Bottom" ],
  11         curCSS,
  12
  13         // cache check for defaultView.getComputedStyle
  14         getComputedStyle = document.defaultView && document.defaultView.getComputedStyle,
  15
  16         fcamelCase = function( all, letter ) {
  17                 return letter.toUpperCase();
  18         };
  19
  20 jQuery.fn.css = function( name, value ) {
  21         return jQuery.access( this, name, value, true, function( elem, name, value ) {
  22                 jQuery.css( elem, name, value );
  23         });
  24 };
  25
  26 jQuery.extend({
  27         cssHooks: {
  28                 opacity: {
  29                         get: function( elem ) {
  30                                 // We should always get a number back from opacity
  31                                 var ret = curCSS( elem, "opacity", "opacity" );
  32                                 return ret === "" ? "1" : ret;
  33                         }
  34                 }
  35         },
  36
  37         // exclude the following css properties to add px
  38         cssNumber: {
  39                 "zIndex": true,
  40                 "fontWeight": true,
  41                 "opacity": true,
  42                 "zoom": true,
  43                 "lineHeight": true
  44         },
  45
  46         cssProps: {
  47                 // normalize float css property
  48                 "float": jQuery.support.cssFloat ? "cssFloat" : "styleFloat"
  49         },
  50
  51         css: function( elem, name, value, force, extra ) {
  52                 // don't set styles on text and comment nodes
  53                 if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 ) {
  54                         return undefined;
  55                 }
  56
  57                 var ret, origName = name.replace( rdashAlpha, fcamelCase ),
  58                         style = elem.style || {}, hooks = jQuery.cssHooks[ origName ] || {};
  59
  60                 name = jQuery.cssProps[ origName ] || origName;
  61
  62                 if ( value !== undefined ) {
  63                         if ( typeof value === "number" && !jQuery.cssNumber[ origName ] ) {
  64                                 value += "px";
  65                         }
  66
  67                         if ( !("set" in hooks) || (value = hooks.set( elem, value )) === false ) {
  68                                 style[ name ] = value;
  69                         }
  70
  71                 } else {
  72                         if ( "get" in hooks && (ret = hooks.get( elem, force, extra )) !== false ) {
  73                                 return ret;
  74                         }
  75
  76                         if ( !force && name in style ) {
  77                                 ret = style[ name ];
  78
  79                         } else if ( curCSS ) {
  80                                 ret = curCSS( elem, name, origName );
  81                         }
  82
  83                         return ret;
  84                 }
  85         },
  86
  87         // A method for quickly swapping in/out CSS properties to get correct calculations
  88         swap: function( elem, options, callback ) {
  89                 var old = {};
  90
  91                 // Remember the old values, and insert the new ones
  92                 for ( var name in options ) {
  93                         old[ name ] = elem.style[ name ];
  94                         elem.style[ name ] = options[ name ];
  95                 }
  96
  97                 callback.call( elem );
  98
  99                 // Revert the old values
 100                 for ( name in options ) {
 101                         elem.style[ name ] = old[ name ];
 102                 }
 103         }
 104 });
 105
 106 jQuery.each(["height", "width"], function( i, name ) {
 107         jQuery.cssHooks[ name ] = {
 108                 get: function( elem, force, extra ) {
 109                         if ( elem.offsetWidth !== 0 ) {
 110                                 val = getWH( elem, name, extra );
 111
 112                         } else {
 113                                 jQuery.swap( elem, cssShow, function() {
 114                                         val = getWH( elem, name, extra );
 115                                 });
 116                         }
 117                 },
 118
 119                 set: function( elem, value ) {
 120                         // ignore negative width and height values #1599
 121                         elem.style[ name ] = Math.max( parseFloat(value), 0 ) + "px";
 122                 }
 123         };
 124 });
 125
 126 if ( !jQuery.support.opacity ) {
 127         jQuery.cssHooks.opacity = {
 128                 get: function( elem, force ) {
 129                         // IE uses filters for opacity
 130                         return ropacity.test(elem.currentStyle.filter || "") ?
 131                                 (parseFloat(RegExp.$1) / 100) + "" :
 132                                 "1";
 133                 },
 134
 135                 set: function( elem, value ) {
 136                         var style = elem.style;
 137
 138                         // IE has trouble with opacity if it does not have layout
 139                         // Force it by setting the zoom level
 140                         style.zoom = 1;
 141
 142                         // Set the alpha filter to set the opacity
 143                         var opacity = parseInt( value, 10 ) + "" === "NaN" ?
 144                                 "" :
 145                                 "alpha(opacity=" + value * 100 + ")";
 146
 147                         var filter = style.filter || jQuery.css( elem, "filter" ) || "";
 148
 149                         style.filter = ralpha.test(filter) ?
 150                                 filter.replace(ralpha, opacity) :
 151                                 opacity;
 152                 }
 153         };
 154 }
 155
 156 if ( getComputedStyle ) {
 157         curCSS = function( elem, newName, name ) {
 158                 var ret, defaultView, computedStyle;
 159
 160                 name = name.replace( rupper, "-$1" ).toLowerCase();
 161
 162                 if ( !(defaultView = elem.ownerDocument.defaultView) ) {
 163                         return undefined;
 164                 }
 165
 166                 if ( (computedStyle = defaultView.getComputedStyle( elem, null )) ) {
 167                         ret = computedStyle.getPropertyValue( name );
 168                 }
 169
 170                 return ret;
 171         };
 172
 173 } else if ( document.documentElement.currentStyle ) {
 174         curCSS = function( elem, name ) {
 175                 var left, rsLeft, ret = elem.currentStyle[ name ];
 176
 177                 // From the awesome hack by Dean Edwards
 178                 // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 179
 180                 // If we're not dealing with a regular pixel number
 181                 // but a number that has a weird ending, we need to convert it to pixels
 182                 if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 183                         // Remember the original values
 184                         left = style.left;
 185                         rsLeft = elem.runtimeStyle.left;
 186
 187                         // Put in the new values to get a computed value out
 188                         elem.runtimeStyle.left = elem.currentStyle.left;
 189                         style.left = name === "fontSize" ? "1em" : (ret || 0);
 190                         ret = style.pixelLeft + "px";
 191
 192                         // Revert the changed values
 193                         style.left = left;
 194                         elem.runtimeStyle.left = rsLeft;
 195                 }
 196
 197                 return ret;
 198         };
 199 }
 200
 201 function getWH( elem, name, extra ) {
 202         var which = name === "width" ? cssWidth : cssHeight,
 203                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 204
 205         if ( extra === "border" ) {
 206                 return val;
 207         }
 208
 209         jQuery.each( which, function() {
 210                 if ( !extra ) {
 211                         val -= parseFloat(jQuery.css( elem, "padding" + this, undefined, true)) || 0;
 212                 }
 213
 214                 if ( extra === "margin" ) {
 215                         val += parseFloat(jQuery.css( elem, "margin" + this, undefined, true)) || 0;
 216
 217                 } else {
 218                         val -= parseFloat(jQuery.css( elem, "border" + this + "Width", undefined, true)) || 0;
 219                 }
 220         });
 221
 222         return val;
 223 }
 224
 225 if ( jQuery.expr && jQuery.expr.filters ) {
 226         jQuery.expr.filters.hidden = function( elem ) {
 227                 var width = elem.offsetWidth, height = elem.offsetHeight,
 228                         skip = elem.nodeName.toLowerCase() === "tr";
 229
 230                 return width === 0 && height === 0 && !skip ?
 231                         true :
 232                         width > 0 && height > 0 && !skip ?
 233                                 false :
 234                                 jQuery.css(elem, "display") === "none";
 235         };
 236
 237         jQuery.expr.filters.visible = function( elem ) {
 238                 return !jQuery.expr.filters.hidden( elem );
 239         };
 240 }