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