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