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 && (!("set" in hooks) || hooks.set( elem, value ) === false) ) {
  97                         style[ name ] = value;
  98                 }
  99
 100                 if ( "get" in hooks ) {
 101                         var cssHookReturn = hooks.get( elem, false );
 102                         if ( cssHookReturn !== false ) {
 103                                 return cssHookReturn;
 104                         }
 105                 }
 106
 107                 return style[ name ];
 108         },
 109
 110         css: function( elem, name, force, extra ) {
 111                 if ( name === "width" || name === "height" ) {
 112                         if ( elem.offsetWidth !== 0 ) {
 113                                 val = getWH( elem, name, extra );
 114
 115                         } else {
 116                                 jQuery.swap( elem, cssShow, function() {
 117                                         val = getWH( elem, name, extra );
 118                                 });
 119                         }
 120
 121                         return Math.max(0, Math.round(val));
 122                 }
 123
 124                 return jQuery.curCSS( elem, name, force );
 125         },
 126
 127         curCSS: function( elem, name, force ) {
 128                 var ret, style = elem.style, filter, hooks = jQuery.cssHooks[name] || {};
 129
 130                 // Make sure we're using the right name for getting the float value
 131                 if ( rfloat.test( name ) ) {
 132                         name = styleFloat;
 133                 }
 134
 135                 if ( "get" in hooks && ( ret = hooks.get( elem, force ) ) !== false ) {
 136                         return ret;
 137                 }
 138
 139                 if ( !force && style && style[ name ] ) {
 140                         ret = style[ name ];
 141
 142                 } else if ( getComputedStyle ) {
 143
 144                         // Only "float" is needed here
 145                         if ( rfloat.test( name ) ) {
 146                                 name = "float";
 147                         }
 148
 149                         name = name.replace( rupper, "-$1" ).toLowerCase();
 150
 151                         var defaultView = elem.ownerDocument.defaultView;
 152
 153                         if ( !defaultView ) {
 154                                 return null;
 155                         }
 156
 157                         var computedStyle = defaultView.getComputedStyle( elem, null );
 158
 159                         if ( computedStyle ) {
 160                                 ret = computedStyle.getPropertyValue( name );
 161                         }
 162
 163                         // We should always get a number back from opacity
 164                         if ( name === "opacity" && ret === "" ) {
 165                                 ret = "1";
 166                         }
 167
 168                 } else if ( elem.currentStyle ) {
 169                         var camelCase = name.replace(rdashAlpha, fcamelCase);
 170
 171                         ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
 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                                 var left = style.left, rsLeft = elem.runtimeStyle.left;
 181
 182                                 // Put in the new values to get a computed value out
 183                                 elem.runtimeStyle.left = elem.currentStyle.left;
 184                                 style.left = camelCase === "fontSize" ? "1em" : (ret || 0);
 185                                 ret = style.pixelLeft + "px";
 186
 187                                 // Revert the changed values
 188                                 style.left = left;
 189                                 elem.runtimeStyle.left = rsLeft;
 190                         }
 191                 }
 192
 193                 return ret;
 194         },
 195
 196         // A method for quickly swapping in/out CSS properties to get correct calculations
 197         swap: function( elem, options, callback ) {
 198                 var old = {};
 199
 200                 // Remember the old values, and insert the new ones
 201                 for ( var name in options ) {
 202                         old[ name ] = elem.style[ name ];
 203                         elem.style[ name ] = options[ name ];
 204                 }
 205
 206                 callback.call( elem );
 207
 208                 // Revert the old values
 209                 for ( name in options ) {
 210                         elem.style[ name ] = old[ name ];
 211                 }
 212         }
 213 });
 214
 215 function getWH( elem, name, extra ) {
 216         var which = name === "width" ? cssWidth : cssHeight,
 217                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 218
 219         if ( extra === "border" ) {
 220                 return val;
 221         }
 222
 223         jQuery.each( which, function() {
 224                 if ( !extra ) {
 225                         val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
 226                 }
 227
 228                 if ( extra === "margin" ) {
 229                         val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
 230
 231                 } else {
 232                         val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
 233                 }
 234         });
 235
 236         return val;
 237 }
 238
 239 if ( jQuery.expr && jQuery.expr.filters ) {
 240         jQuery.expr.filters.hidden = function( elem ) {
 241                 var width = elem.offsetWidth, height = elem.offsetHeight,
 242                         skip = elem.nodeName.toLowerCase() === "tr";
 243
 244                 return width === 0 && height === 0 && !skip ?
 245                         true :
 246                         width > 0 && height > 0 && !skip ?
 247                                 false :
 248                                 jQuery.curCSS(elem, "display") === "none";
 249         };
 250
 251         jQuery.expr.filters.visible = function( elem ) {
 252                 return !jQuery.expr.filters.hidden( elem );
 253         };
 254 }