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