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
   8 jQuery.fn.css = function( name, value ) {
   9         var options = name, isFunction = jQuery.isFunction( value );
  10
  11         if ( typeof name === "string" ) {
  12                 // Are we setting the style?
  13                 if ( value === undefined ) {
  14                         return this.length ?
  15                                 jQuery.css( this[0], name ) :
  16                                 null;
  17
  18                 // Convert name, value params to options hash format
  19                 } else {
  20                         options = {};
  21                         options[ name ] = value;
  22                 }
  23         }
  24
  25         var isFunction = {};
  26
  27         // For each value, determine whether it's a Function so we don't
  28         // need to determine it again for each element
  29         for ( var prop in options )
  30                 isFunction[prop] = jQuery.isFunction( options[prop] );
  31
  32         // For each element...
  33         for ( var i = 0, l = this.length; i < l; i++ ) {
  34                 var elem = this[i];
  35
  36                 // Set all the styles
  37                 for ( var prop in options ) {
  38                         value = options[prop];
  39
  40                         if ( isFunction[prop] ) value = value.call( elem, i );
  41
  42                         if ( typeof value === "number" && !exclude.test(prop) ) {
  43                                 value = value + "px";
  44                         }
  45
  46                         jQuery.style( elem, prop, value );
  47                 }
  48         }
  49
  50         return this;
  51 };
  52
  53 jQuery.extend({
  54         style: function( elem, name, value ) {
  55                 // don't set styles on text and comment nodes
  56                 if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
  57                         return undefined;
  58
  59                 // ignore negative width and height values #1599
  60                 if ( (name == 'width' || name == 'height') && parseFloat(value) < 0 )
  61                         value = undefined;
  62
  63                 var style = elem.style || elem, set = value !== undefined;
  64
  65                 // IE uses filters for opacity
  66                 if ( !jQuery.support.opacity && name == "opacity" ) {
  67                         if ( set ) {
  68                                 // IE has trouble with opacity if it does not have layout
  69                                 // Force it by setting the zoom level
  70                                 style.zoom = 1;
  71
  72                                 // Set the alpha filter to set the opacity
  73                                 style.filter = (style.filter || "").replace( /alpha\([^)]*\)/, "" ) +
  74                                         (parseInt( value ) + '' == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")");
  75                         }
  76
  77                         return style.filter && style.filter.indexOf("opacity=") >= 0 ?
  78                                 (parseFloat( /opacity=([^)]*)/.exec(style.filter)[1] ) / 100) + '':
  79                                 "";
  80                 }
  81
  82                 // Make sure we're using the right name for getting the float value
  83                 if ( /float/i.test( name ) )
  84                         name = styleFloat;
  85
  86                 name = name.replace(/-([a-z])/ig, function(all, letter){
  87                         return letter.toUpperCase();
  88                 });
  89
  90                 if ( set )
  91                         style[ name ] = value;
  92
  93                 return style[ name ];
  94         },
  95
  96         css: function( elem, name, force, extra ) {
  97                 if ( name == "width" || name == "height" ) {
  98                         var val, props = { position: "absolute", visibility: "hidden", display:"block" }, which = name == "width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ];
  99
 100                         function getWH() {
 101                                 val = name == "width" ? elem.offsetWidth : elem.offsetHeight;
 102
 103                                 if ( extra === "border" )
 104                                         return;
 105
 106                                 jQuery.each( which, function() {
 107                                         if ( !extra )
 108                                                 val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
 109                                         if ( extra === "margin" )
 110                                                 val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
 111                                         else
 112                                                 val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
 113                                 });
 114                         }
 115
 116                         if ( elem.offsetWidth !== 0 )
 117                                 getWH();
 118                         else
 119                                 jQuery.swap( elem, props, getWH );
 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;
 129
 130                 // IE uses filters for opacity
 131                 if ( !jQuery.support.opacity && name === "opacity" && elem.currentStyle ) {
 132                         ret = /opacity=([^)]*)/.test(elem.currentStyle.filter || "") ?
 133                                 (parseFloat(RegExp.$1) / 100) + "" :
 134                                 "";
 135
 136                         return ret === "" ?
 137                                 "1" :
 138                                 ret;
 139                 }
 140
 141                 // Make sure we're using the right name for getting the float value
 142                 if ( /float/i.test( name ) )
 143                         name = styleFloat;
 144
 145                 if ( !force && style && style[ name ] ) {
 146                         ret = style[ name ];
 147
 148                 } else if ( getComputedStyle ) {
 149
 150                         // Only "float" is needed here
 151                         if ( /float/i.test( name ) )
 152                                 name = "float";
 153
 154                         name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();
 155
 156                         var computedStyle = elem.ownerDocument.defaultView.getComputedStyle( elem, null );
 157
 158                         if ( computedStyle )
 159                                 ret = computedStyle.getPropertyValue( name );
 160
 161                         // We should always get a number back from opacity
 162                         if ( name == "opacity" && ret == "" )
 163                                 ret = "1";
 164
 165                 } else if ( elem.currentStyle ) {
 166                         var camelCase = name.replace(/\-(\w)/g, function(all, letter){
 167                                 return letter.toUpperCase();
 168                         });
 169
 170                         ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
 171
 172                         // From the awesome hack by Dean Edwards
 173                         // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 174
 175                         // If we're not dealing with a regular pixel number
 176                         // but a number that has a weird ending, we need to convert it to pixels
 177                         if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
 178                                 // Remember the original values
 179                                 var left = style.left, rsLeft = elem.runtimeStyle.left;
 180
 181                                 // Put in the new values to get a computed value out
 182                                 elem.runtimeStyle.left = elem.currentStyle.left;
 183                                 style.left = ret || 0;
 184                                 ret = style.pixelLeft + "px";
 185
 186                                 // Revert the changed values
 187                                 style.left = left;
 188                                 elem.runtimeStyle.left = rsLeft;
 189                         }
 190                 }
 191
 192                 return ret;
 193         },
 194
 195         // A method for quickly swapping in/out CSS properties to get correct calculations
 196         swap: function( elem, options, callback ) {
 197                 var old = {};
 198                 // Remember the old values, and insert the new ones
 199                 for ( var name in options ) {
 200                         old[ name ] = elem.style[ name ];
 201                         elem.style[ name ] = options[ name ];
 202                 }
 203
 204                 callback.call( elem );
 205
 206                 // Revert the old values
 207                 for ( var name in options )
 208                         elem.style[ name ] = old[ name ];
 209         }
 210 });