jquery/src/css.js

(function( jQuery ) {

var ralpha = /alpha\([^)]*\)/i,
	ropacity = /opacity=([^)]*)/,
	// fixed for IE9, see #8346
	rupper = /([A-Z]|^ms)/g,
	rnum = /^[\-+]?(?:\d*\.)?\d+$/i,
	rnumnonpx = /^-?(?:\d*\.)?\d+(?!px)[^\d\s]+$/i,
	rrelNum = /^([\-+])=([\-+.\de]+)/,
	rmargin = /^margin/,

	cssShow = { position: "absolute", visibility: "hidden", display: "block" },

	// order is important!
	cssExpand = [ "Top", "Right", "Bottom", "Left" ],

	curCSS,

	getComputedStyle,
	currentStyle;

jQuery.fn.css = function( name, value ) {
	return jQuery.access( this, function( elem, name, value ) {
		return value !== undefined ?
			jQuery.style( elem, name, value ) :
			jQuery.css( elem, name );
	}, name, value, arguments.length > 1 );
};

jQuery.extend({
	// Add in style property hooks for overriding the default
	// behavior of getting and setting a style property
	cssHooks: {
		opacity: {
			get: function( elem, computed ) {
				if ( computed ) {
					// We should always get a number back from opacity
					var ret = curCSS( elem, "opacity" );
					return ret === "" ? "1" : ret;

				} else {
					return elem.style.opacity;
				}
			}
		}
	},

	// Exclude the following css properties to add px
	cssNumber: {
		"fillOpacity": true,
		"fontWeight": true,
		"lineHeight": true,
		"opacity": true,
		"orphans": true,
		"widows": true,
		"zIndex": true,
		"zoom": true
	},

	// Add in properties whose names you wish to fix before
	// setting or getting the value
	cssProps: {
		// normalize float css property
		"float": jQuery.support.cssFloat ? "cssFloat" : "styleFloat"
	},

	// Get and set the style property on a DOM Node
	style: function( elem, name, value, extra ) {
		// Don't set styles on text and comment nodes
		if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
			return;
		}

		// Make sure that we're working with the right name
		var ret, type, origName = jQuery.camelCase( name ),
			style = elem.style, hooks = jQuery.cssHooks[ origName ];

		name = jQuery.cssProps[ origName ] || origName;

		// Check if we're setting a value
		if ( value !== undefined ) {
			type = typeof value;

			// convert relative number strings (+= or -=) to relative numbers. #7345
			if ( type === "string" && (ret = rrelNum.exec( value )) ) {
				value = ( +( ret[1] + 1) * +ret[2] ) + parseFloat( jQuery.css( elem, name ) );
				// Fixes bug #9237
				type = "number";
			}

			// Make sure that NaN and null values aren't set. See: #7116
			if ( value == null || type === "number" && isNaN( value ) ) {
				return;
			}

			// If a number was passed in, add 'px' to the (except for certain CSS properties)
			if ( type === "number" && !jQuery.cssNumber[ origName ] ) {
				value += "px";
			}

			// If a hook was provided, use that value, otherwise just set the specified value
			if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value )) !== undefined ) {
				// Wrapped to prevent IE from throwing errors when 'invalid' values are provided
				// Fixes bug #5509
				try {
					style[ name ] = value;
				} catch(e) {}
			}

		} else {
			// If a hook was provided get the non-computed value from there
			if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
				return ret;
			}

			// Otherwise just get the value from the style object
			return style[ name ];
		}
	},

	css: function( elem, name, extra ) {
		var ret, hooks;

		// Make sure that we're working with the right name
		name = jQuery.camelCase( name );
		hooks = jQuery.cssHooks[ name ];
		name = jQuery.cssProps[ name ] || name;

		// cssFloat needs a special treatment
		if ( name === "cssFloat" ) {
			name = "float";
		}

		// If a hook was provided get the computed value from there
		if ( hooks && "get" in hooks && (ret = hooks.get( elem, true, extra )) !== undefined ) {
			return ret;

		// Otherwise, if a way to get the computed value exists, use that
		} else if ( curCSS ) {
			return curCSS( elem, name );
		}
	},

	// A method for quickly swapping in/out CSS properties to get correct calculations
	swap: function( elem, options, callback ) {
		var old = {},
			ret, name;

		// Remember the old values, and insert the new ones
		for ( name in options ) {
			old[ name ] = elem.style[ name ];
			elem.style[ name ] = options[ name ];
		}

		ret = callback.call( elem );

		// Revert the old values
		for ( name in options ) {
			elem.style[ name ] = old[ name ];
		}

		return ret;
	}
});

// DEPRECATED, Use jQuery.css() instead
jQuery.curCSS = jQuery.css;

if ( document.defaultView && document.defaultView.getComputedStyle ) {
	getComputedStyle = function( elem, name ) {
		var ret, defaultView, computedStyle, width,
			style = elem.style;

		name = name.replace( rupper, "-$1" ).toLowerCase();

		if ( (defaultView = elem.ownerDocument.defaultView) &&
				(computedStyle = defaultView.getComputedStyle( elem, null )) ) {

			ret = computedStyle.getPropertyValue( name );
			if ( ret === "" && !jQuery.contains( elem.ownerDocument.documentElement, elem ) ) {
				ret = jQuery.style( elem, name );
			}
		}

		// A tribute to the "awesome hack by Dean Edwards"
		// WebKit uses "computed value (percentage if specified)" instead of "used value" for margins
		// which is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values
		if ( !jQuery.support.pixelMargin && computedStyle && rmargin.test( name ) && rnumnonpx.test( ret ) ) {
			width = style.width;
			style.width = ret;
			ret = computedStyle.width;
			style.width = width;
		}

		return ret;
	};
}

if ( document.documentElement.currentStyle ) {
	currentStyle = function( elem, name ) {
		var left, rsLeft, uncomputed,
			ret = elem.currentStyle && elem.currentStyle[ name ],
			style = elem.style;

		// Avoid setting ret to empty string here
		// so we don't default to auto
		if ( ret == null && style && (uncomputed = style[ name ]) ) {
			ret = uncomputed;
		}

		// From the awesome hack by Dean Edwards
		// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291

		// If we're not dealing with a regular pixel number
		// but a number that has a weird ending, we need to convert it to pixels
		if ( rnumnonpx.test( ret ) ) {

			// Remember the original values
			left = style.left;
			rsLeft = elem.runtimeStyle && elem.runtimeStyle.left;

			// Put in the new values to get a computed value out
			if ( rsLeft ) {
				elem.runtimeStyle.left = elem.currentStyle.left;
			}
			style.left = name === "fontSize" ? "1em" : ret;
			ret = style.pixelLeft + "px";

			// Revert the changed values
			style.left = left;
			if ( rsLeft ) {
				elem.runtimeStyle.left = rsLeft;
			}
		}

		return ret === "" ? "auto" : ret;
	};
}

curCSS = getComputedStyle || currentStyle;

function getWidthOrHeight( elem, name, extra ) {

	// Start with offset property
	var val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
		i = name === "width" ? 1 : 0,
		len = 4;

	if ( val > 0 ) {
		if ( extra !== "border" ) {
			for ( ; i < len; i += 2 ) {
				if ( !extra ) {
					val -= parseFloat( jQuery.css( elem, "padding" + cssExpand[ i ] ) ) || 0;
				}
				if ( extra === "margin" ) {
					val += parseFloat( jQuery.css( elem, extra + cssExpand[ i ] ) ) || 0;
				} else {
					val -= parseFloat( jQuery.css( elem, "border" + cssExpand[ i ] + "Width" ) ) || 0;
				}
			}
		}

		return val + "px";
	}

	// Fall back to computed then uncomputed css if necessary
	val = curCSS( elem, name );
	if ( val < 0 || val == null ) {
		val = elem.style[ name ];
	}

	// Computed unit is not pixels. Stop here and return.
	if ( rnumnonpx.test(val) ) {
		return val;
	}

	// Normalize "", auto, and prepare for extra
	val = parseFloat( val ) || 0;

	// Add padding, border, margin
	if ( extra ) {
		for ( ; i < len; i += 2 ) {
			val += parseFloat( jQuery.css( elem, "padding" + cssExpand[ i ] ) ) || 0;
			if ( extra !== "padding" ) {
				val += parseFloat( jQuery.css( elem, "border" + cssExpand[ i ] + "Width" ) ) || 0;
			}
			if ( extra === "margin" ) {
				val += parseFloat( jQuery.css( elem, extra + cssExpand[ i ]) ) || 0;
			}
		}
	}

	return val + "px";
}

jQuery.each([ "height", "width" ], function( i, name ) {
	jQuery.cssHooks[ name ] = {
		get: function( elem, computed, extra ) {
			if ( computed ) {
				if ( elem.offsetWidth !== 0 ) {
					return getWidthOrHeight( elem, name, extra );
				} else {
					return jQuery.swap( elem, cssShow, function() {
						return getWidthOrHeight( elem, name, extra );
					});
				}
			}
		},

		set: function( elem, value ) {
			return rnum.test( value ) ?
				value + "px" :
				value;
		}
	};
});

if ( !jQuery.support.opacity ) {
	jQuery.cssHooks.opacity = {
		get: function( elem, computed ) {
			// IE uses filters for opacity
			return ropacity.test( (computed && elem.currentStyle ? elem.currentStyle.filter : elem.style.filter) || "" ) ?
				( parseFloat( RegExp.$1 ) / 100 ) + "" :
				computed ? "1" : "";
		},

		set: function( elem, value ) {
			var style = elem.style,
				currentStyle = elem.currentStyle,
				opacity = jQuery.isNumeric( value ) ? "alpha(opacity=" + value * 100 + ")" : "",
				filter = currentStyle && currentStyle.filter || style.filter || "";

			// IE has trouble with opacity if it does not have layout
			// Force it by setting the zoom level
			style.zoom = 1;

			// if setting opacity to 1, and no other filters exist - attempt to remove filter attribute #6652
			if ( value >= 1 && jQuery.trim( filter.replace( ralpha, "" ) ) === "" ) {

				// Setting style.filter to null, "" & " " still leave "filter:" in the cssText
				// if "filter:" is present at all, clearType is disabled, we want to avoid this
				// style.removeAttribute is IE Only, but so apparently is this code path...
				style.removeAttribute( "filter" );

				// if there there is no filter style applied in a css rule, we are done
				if ( currentStyle && !currentStyle.filter ) {
					return;
				}
			}

			// otherwise, set new filter values
			style.filter = ralpha.test( filter ) ?
				filter.replace( ralpha, opacity ) :
				filter + " " + opacity;
		}
	};
}

jQuery(function() {
	// This hook cannot be added until DOM ready because the support test
	// for it is not run until after DOM ready
	if ( !jQuery.support.reliableMarginRight ) {
		jQuery.cssHooks.marginRight = {
			get: function( elem, computed ) {
				// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
				// Work around by temporarily setting element display to inline-block
				return jQuery.swap( elem, { "display": "inline-block" }, function() {
					if ( computed ) {
						return curCSS( elem, "margin-right" );
					} else {
						return elem.style.marginRight;
					}
				});
			}
		};
	}
});

if ( jQuery.expr && jQuery.expr.filters ) {
	jQuery.expr.filters.hidden = function( elem ) {
		var width = elem.offsetWidth,
			height = elem.offsetHeight;

		return ( width === 0 && height === 0 ) || (!jQuery.support.reliableHiddenOffsets && ((elem.style && elem.style.display) || jQuery.css( elem, "display" )) === "none");
	};

	jQuery.expr.filters.visible = function( elem ) {
		return !jQuery.expr.filters.hidden( elem );
	};
}

// These hooks are used by animate to expand properties
jQuery.each({
	margin: "",
	padding: "",
	border: "Width"
}, function( prefix, suffix ) {

	jQuery.cssHooks[ prefix + suffix ] = {
		expand: function( value ) {
			var i,

				// assumes a single number if not a string
				parts = typeof value === "string" ? value.split(" ") : [ value ],
				expanded = {};

			for ( i = 0; i < 4; i++ ) {
				expanded[ prefix + cssExpand[ i ] + suffix ] =
					parts[ i ] || parts[ i - 2 ] || parts[ 0 ];
			}

			return expanded;
		}
	};
});

})( jQuery );