jquery/src/css.js

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// exclude the following css properties to add px
var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i,
// cache check for defaultView.getComputedStyle
getComputedStyle = document.defaultView && document.defaultView.getComputedStyle,
// normalize float css property
styleFloat = jQuery.support.cssFloat ? "cssFloat" : "styleFloat";
jQuery.fn.css = function( name, value ) {
var options = name, isFunction = jQuery.isFunction( value );
if ( typeof name === "string" ) {
// Are we setting the style?
if ( value === undefined ) {
return this.length ?
jQuery.css( this[0], name ) :
null;
// Convert name, value params to options hash format
} else {
options = {};
options[ name ] = value;
}
}
// For each element...
for ( var i = 0, l = this.length; i < l; i++ ) {
var elem = this[i];
// Set all the styles
for ( var prop in options ) {
value = options[prop];
if ( isFunction ) {
value = value.call( elem, i );
}
if ( typeof value === "number" && !exclude.test(prop) ) {
value = value + "px";
}
jQuery.style( elem, prop, value );
}
}
return this;
};
jQuery.extend({
style: function( elem, name, value ) {
// don't set styles on text and comment nodes
if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
return undefined;
// ignore negative width and height values #1599
if ( (name == 'width' || name == 'height') && parseFloat(value) < 0 )
value = undefined;
var style = elem.style || elem, set = value !== undefined;
// IE uses filters for opacity
if ( !jQuery.support.opacity && name == "opacity" ) {
if ( set ) {
// IE has trouble with opacity if it does not have layout
// Force it by setting the zoom level
style.zoom = 1;
// Set the alpha filter to set the opacity
style.filter = (style.filter || "").replace( /alpha\([^)]*\)/, "" ) +
(parseInt( value ) + '' == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")");
}
return style.filter && style.filter.indexOf("opacity=") >= 0 ?
(parseFloat( style.filter.match(/opacity=([^)]*)/)[1] ) / 100) + '':
"";
}
// Make sure we're using the right name for getting the float value
if ( /float/i.test( name ) )
name = styleFloat;
name = name.replace(/-([a-z])/ig, function(all, letter){
return letter.toUpperCase();
});
if ( set )
style[ name ] = value;
return style[ name ];
},
css: function( elem, name, force, extra ) {
if ( name == "width" || name == "height" ) {
var val, props = { position: "absolute", visibility: "hidden", display:"block" }, which = name == "width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ];
function getWH() {
val = name == "width" ? elem.offsetWidth : elem.offsetHeight;
if ( extra === "border" )
return;
jQuery.each( which, function() {
if ( !extra )
val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
if ( extra === "margin" )
val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
else
val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
});
}
if ( elem.offsetWidth !== 0 )
getWH();
else
jQuery.swap( elem, props, getWH );
return Math.max(0, Math.round(val));
}
return jQuery.curCSS( elem, name, force );
},
curCSS: function( elem, name, force ) {
var ret, style = elem.style;
// IE uses filters for opacity
if ( !jQuery.support.opacity && name == "opacity" ) {
ret = style.filter && style.filter.indexOf("opacity=") >= 0 ?
(parseFloat( style.filter.match(/opacity=([^)]*)/)[1] ) / 100) + '':
"";
return ret === "" ?
"1" :
ret;
}
// Make sure we're using the right name for getting the float value
if ( /float/i.test( name ) )
name = styleFloat;
if ( !force && style && style[ name ] ) {
ret = style[ name ];
} else if ( getComputedStyle ) {
// Only "float" is needed here
if ( /float/i.test( name ) )
name = "float";
name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();
var computedStyle = elem.ownerDocument.defaultView.getComputedStyle( elem, null );
if ( computedStyle )
ret = computedStyle.getPropertyValue( name );
// We should always get a number back from opacity
if ( name == "opacity" && ret == "" )
ret = "1";
} else if ( elem.currentStyle ) {
var camelCase = name.replace(/\-(\w)/g, function(all, letter){
return letter.toUpperCase();
});
ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
// From the awesome hack by Dean Edwards
// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
// If we're not dealing with a regular pixel number
// but a number that has a weird ending, we need to convert it to pixels
if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
// Remember the original values
var left = style.left, rsLeft = elem.runtimeStyle.left;
// Put in the new values to get a computed value out
elem.runtimeStyle.left = elem.currentStyle.left;
style.left = ret || 0;
ret = style.pixelLeft + "px";
// Revert the changed values
style.left = left;
elem.runtimeStyle.left = rsLeft;
}
}
return ret;
},
// A method for quickly swapping in/out CSS properties to get correct calculations
swap: function( elem, options, callback ) {
var old = {};
// Remember the old values, and insert the new ones
for ( var name in options ) {
old[ name ] = elem.style[ name ];
elem.style[ name ] = options[ name ];
}
callback.call( elem );
// Revert the old values
for ( var name in options )
elem.style[ name ] = old[ name ];
}
});