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