src/css.js

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