src/css.js

   1 // exclude the following css properties to add px
   2 var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i,
   3         // cache check for defaultView.getComputedStyle
   4         getComputedStyle = document.defaultView && document.defaultView.getComputedStyle,
   5         // normalize float css property
   6         styleFloat = jQuery.support.cssFloat ? "cssFloat" : "styleFloat",
   7         fcamelCase = function(all, letter){
   8                 return letter.toUpperCase();
   9         };
  10
  11 jQuery.fn.css = function( name, value ) {
  12         var options = name, isFunction = jQuery.isFunction( value );
  13
  14         if ( typeof name === "string" ) {
  15                 // Are we setting the style?
  16                 if ( value === undefined ) {
  17                         return this.length ?
  18                                 jQuery.css( this[0], name ) :
  19                                 null;
  20
  21                 // Convert name, value params to options hash format
  22                 } else {
  23                         options = {};
  24                         options[ name ] = value;
  25                 }
  26         }
  27
  28         var isFunction = {};
  29
  30         // For each value, determine whether it's a Function so we don't
  31         // need to determine it again for each element
  32         for ( var prop in options )
  33                 isFunction[prop] = jQuery.isFunction( options[prop] );
  34
  35         // For each element...
  36         for ( var i = 0, l = this.length; i < l; i++ ) {
  37                 var elem = this[i];
  38
  39                 // Set all the styles
  40                 for ( var prop in options ) {
  41                         value = options[prop];
  42
  43                         if ( isFunction[prop] ) value = value.call( elem, i );
  44
  45                         if ( typeof value === "number" && !exclude.test(prop) ) {
  46                                 value = value + "px";
  47                         }
  48
  49                         jQuery.style( elem, prop, value );
  50                 }
  51         }
  52
  53         return this;
  54 };
  55
  56 jQuery.extend({
  57         style: function( elem, name, value ) {
  58                 // don't set styles on text and comment nodes
  59                 if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
  60                         return undefined;
  61
  62                 // ignore negative width and height values #1599
  63                 if ( (name == 'width' || name == 'height') && parseFloat(value) < 0 )
  64                         value = undefined;
  65
  66                 var style = elem.style || elem, set = value !== undefined;
  67
  68                 // IE uses filters for opacity
  69                 if ( !jQuery.support.opacity && name == "opacity" ) {
  70                         if ( set ) {
  71                                 // IE has trouble with opacity if it does not have layout
  72                                 // Force it by setting the zoom level
  73                                 style.zoom = 1;
  74
  75                                 // Set the alpha filter to set the opacity
  76                                 style.filter = (style.filter || "").replace( /alpha\([^)]*\)/, "" ) +
  77                                         (parseInt( value ) + '' == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")");
  78                         }
  79
  80                         return style.filter && style.filter.indexOf("opacity=") >= 0 ?
  81                                 (parseFloat( /opacity=([^)]*)/.exec(style.filter)[1] ) / 100) + '':
  82                                 "";
  83                 }
  84
  85                 // Make sure we're using the right name for getting the float value
  86                 if ( /float/i.test( name ) )
  87                         name = styleFloat;
  88
  89                 name = name.replace(/-([a-z])/ig, fcamelCase);
  90
  91                 if ( set )
  92                         style[ name ] = value;
  93
  94                 return style[ name ];
  95         },
  96
  97         css: function( elem, name, force, extra ) {
  98                 if ( name == "width" || name == "height" ) {
  99                         var val, props = { position: "absolute", visibility: "hidden", display:"block" }, which = name == "width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ];
 100
 101                         function getWH() {
 102                                 val = name == "width" ? elem.offsetWidth : elem.offsetHeight;
 103
 104                                 if ( extra === "border" )
 105                                         return;
 106
 107                                 jQuery.each( which, function() {
 108                                         if ( !extra )
 109                                                 val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
 110                                         if ( extra === "margin" )
 111                                                 val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
 112                                         else
 113                                                 val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
 114                                 });
 115                         }
 116
 117                         if ( elem.offsetWidth !== 0 )
 118                                 getWH();
 119                         else
 120                                 jQuery.swap( elem, props, getWH );
 121
 122                         return Math.max(0, Math.round(val));
 123                 }
 124
 125                 return jQuery.curCSS( elem, name, force );
 126         },
 127
 128         curCSS: function( elem, name, force ) {
 129                 var ret, style = elem.style, filter;
 130
 131                 // IE uses filters for opacity
 132                 if ( !jQuery.support.opacity && name === "opacity" && elem.currentStyle ) {
 133                         ret = /opacity=([^)]*)/.test(elem.currentStyle.filter || "") ?
 134                                 (parseFloat(RegExp.$1) / 100) + "" :
 135                                 "";
 136
 137                         return ret === "" ?
 138                                 "1" :
 139                                 ret;
 140                 }
 141
 142                 // Make sure we're using the right name for getting the float value
 143                 if ( /float/i.test( name ) )
 144                         name = styleFloat;
 145
 146                 if ( !force && style && style[ name ] ) {
 147                         ret = style[ name ];
 148
 149                 } else if ( getComputedStyle ) {
 150
 151                         // Only "float" is needed here
 152                         if ( /float/i.test( name ) )
 153                                 name = "float";
 154
 155                         name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();
 156
 157                         var computedStyle = elem.ownerDocument.defaultView.getComputedStyle( elem, null );
 158
 159                         if ( computedStyle )
 160                                 ret = computedStyle.getPropertyValue( name );
 161
 162                         // We should always get a number back from opacity
 163                         if ( name == "opacity" && ret == "" )
 164                                 ret = "1";
 165
 166                 } else if ( elem.currentStyle ) {
 167                         var camelCase = name.replace(/\-(\w)/g, fcamelCase);
 168
 169                         ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
 170
 171                         // From the awesome hack by Dean Edwards
 172                         // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 173
 174                         // If we're not dealing with a regular pixel number
 175                         // but a number that has a weird ending, we need to convert it to pixels
 176                         if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
 177                                 // Remember the original values
 178                                 var left = style.left, rsLeft = elem.runtimeStyle.left;
 179
 180                                 // Put in the new values to get a computed value out
 181                                 elem.runtimeStyle.left = elem.currentStyle.left;
 182                                 style.left = ret || 0;
 183                                 ret = style.pixelLeft + "px";
 184
 185                                 // Revert the changed values
 186                                 style.left = left;
 187                                 elem.runtimeStyle.left = rsLeft;
 188                         }
 189                 }
 190
 191                 return ret;
 192         },
 193
 194         // A method for quickly swapping in/out CSS properties to get correct calculations
 195         swap: function( elem, options, callback ) {
 196                 var old = {};
 197                 // Remember the old values, and insert the new ones
 198                 for ( var name in options ) {
 199                         old[ name ] = elem.style[ name ];
 200                         elem.style[ name ] = options[ name ];
 201                 }
 202
 203                 callback.call( elem );
 204
 205                 // Revert the old values
 206                 for ( var name in options )
 207                         elem.style[ name ] = old[ name ];
 208         }
 209 });