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         cssHooks: {
  39                 opacity: {
  40                         get: function( elem, force ) {
  41                                 var style = elem.style;
  42                                 if ( jQuery.support.opacity && !style.filter ) {
  43                                         return false; // move along, nothing to see here
  44                                 }
  45
  46                                 // IE uses filters for opacity
  47                                 var ret = ropacity.test(elem.currentStyle.filter || "") ?
  48                                                         (parseFloat(RegExp.$1) / 100) + "" :
  49                                                         "";
  50
  51                                 return ret === "" ?
  52                                         "1" :
  53                                         ret;
  54                         },
  55
  56                         set: function( elem, value ) {
  57                                 var style = elem.style;
  58                                 if ( jQuery.support.opacity && !style.filter ) {
  59                                         return false; // move along, nothing to see here
  60                                 }
  61
  62                                 // IE has trouble with opacity if it does not have layout
  63                                 // Force it by setting the zoom level
  64                                 style.zoom = 1;
  65
  66                                 // Set the alpha filter to set the opacity
  67                                 var opacity = parseInt( value, 10 ) + "" === "NaN" ? "" : "alpha(opacity=" + value * 100 + ")";
  68                                 var filter = style.filter || jQuery.curCSS( elem, "filter" ) || "";
  69                                 style.filter = ralpha.test(filter) ? filter.replace(ralpha, opacity) : opacity;
  70                         }
  71                 }
  72         },
  73
  74         style: function( elem, name, value ) {
  75                 // don't set styles on text and comment nodes
  76                 if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 ) {
  77                         return undefined;
  78                 }
  79
  80                 // ignore negative width and height values #1599
  81                 if ( (name === "width" || name === "height") && parseFloat(value) < 0 ) {
  82                         value = undefined;
  83                 }
  84
  85                 var style = elem.style || elem, set = value !== undefined;
  86
  87                 // Make sure we're using the right name for getting the float value
  88                 if ( rfloat.test( name ) ) {
  89                         name = styleFloat;
  90                 }
  91
  92                 name = name.replace(rdashAlpha, fcamelCase);
  93
  94                 var hooks = jQuery.cssHooks[name] || {};
  95
  96                 if ( set ) {
  97                         if ( !('set' in hooks) || hooks.set( elem, value ) === false ) {
  98                                 style[ name ] = value;
  99                         }
 100                 }
 101
 102                 if ( 'get' in hooks ) {
 103                         var cssHookReturn = hooks.get( elem, false );
 104                         if ( cssHookReturn !== false ) {
 105                                 return cssHookReturn;
 106                         }
 107                 }
 108
 109                 return style[ name ];
 110         },
 111
 112         css: function( elem, name, force, extra ) {
 113                 if ( name === "width" || name === "height" ) {
 114                         if ( elem.offsetWidth !== 0 ) {
 115                                 val = getWH( elem, name, extra );
 116
 117                         } else {
 118                                 jQuery.swap( elem, cssShow, function() {
 119                                         val = getWH( elem, name, extra );
 120                                 });
 121                         }
 122
 123                         return Math.max(0, Math.round(val));
 124                 }
 125
 126                 return jQuery.curCSS( elem, name, force );
 127         },
 128
 129         curCSS: function( elem, name, force ) {
 130                 var ret, style = elem.style, filter, hooks = jQuery.cssHooks[name] || {};
 131
 132                 // Make sure we're using the right name for getting the float value
 133                 if ( rfloat.test( name ) ) {
 134                         name = styleFloat;
 135                 }
 136
 137                 if ( 'get' in hooks && ( ret = hooks.get( elem, force ) ) !== false ) {
 138                         return ret;
 139                 }
 140
 141                 if ( !force && style && style[ name ] ) {
 142                         ret = style[ name ];
 143
 144                 } else if ( getComputedStyle ) {
 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                         var defaultView = elem.ownerDocument.defaultView;
 154
 155                         if ( !defaultView ) {
 156                                 return null;
 157                         }
 158
 159                         var computedStyle = defaultView.getComputedStyle( elem, null );
 160
 161                         if ( computedStyle ) {
 162                                 ret = computedStyle.getPropertyValue( name );
 163                         }
 164
 165                         // We should always get a number back from opacity
 166                         if ( name === "opacity" && ret === "" ) {
 167                                 ret = "1";
 168                         }
 169
 170                 } else if ( elem.currentStyle ) {
 171                         var camelCase = name.replace(rdashAlpha, fcamelCase);
 172
 173                         ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
 174
 175                         // From the awesome hack by Dean Edwards
 176                         // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 177
 178                         // If we're not dealing with a regular pixel number
 179                         // but a number that has a weird ending, we need to convert it to pixels
 180                         if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 181                                 // Remember the original values
 182                                 var left = style.left, rsLeft = elem.runtimeStyle.left;
 183
 184                                 // Put in the new values to get a computed value out
 185                                 elem.runtimeStyle.left = elem.currentStyle.left;
 186                                 style.left = camelCase === "fontSize" ? "1em" : (ret || 0);
 187                                 ret = style.pixelLeft + "px";
 188
 189                                 // Revert the changed values
 190                                 style.left = left;
 191                                 elem.runtimeStyle.left = rsLeft;
 192                         }
 193                 }
 194
 195                 return ret;
 196         },
 197
 198         // A method for quickly swapping in/out CSS properties to get correct calculations
 199         swap: function( elem, options, callback ) {
 200                 var old = {};
 201
 202                 // Remember the old values, and insert the new ones
 203                 for ( var name in options ) {
 204                         old[ name ] = elem.style[ name ];
 205                         elem.style[ name ] = options[ name ];
 206                 }
 207
 208                 callback.call( elem );
 209
 210                 // Revert the old values
 211                 for ( name in options ) {
 212                         elem.style[ name ] = old[ name ];
 213                 }
 214         }
 215 });
 216
 217 function getWH( elem, name, extra ) {
 218         var which = name === "width" ? cssWidth : cssHeight,
 219                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 220
 221         if ( extra === "border" ) {
 222                 return val;
 223         }
 224
 225         jQuery.each( which, function() {
 226                 if ( !extra ) {
 227                         val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
 228                 }
 229
 230                 if ( extra === "margin" ) {
 231                         val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
 232
 233                 } else {
 234                         val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
 235                 }
 236         });
 237
 238         return val;
 239 }
 240
 241 if ( jQuery.expr && jQuery.expr.filters ) {
 242         jQuery.expr.filters.hidden = function( elem ) {
 243                 var width = elem.offsetWidth, height = elem.offsetHeight,
 244                         skip = elem.nodeName.toLowerCase() === "tr";
 245
 246                 return width === 0 && height === 0 && !skip ?
 247                         true :
 248                         width > 0 && height > 0 && !skip ?
 249                                 false :
 250                                 jQuery.curCSS(elem, "display") === "none";
 251         };
 252
 253         jQuery.expr.filters.visible = function( elem ) {
 254                 return !jQuery.expr.filters.hidden( elem );
 255         };
 256 }