Javascript Reference
Categories: STYLE

javascript STYLE Description

@Aug. 17, 2009, 8:44 a.m.
style, CSSStyleDeclaration Firefox/Netscape/NN 6 IE 4 Chrome/Safari/DOM 2  

 

  

In its most generic sense, a style object is the access point for scripts to read and write individual style attributes for a given element. This style object exposes (or has the potential to expose) every style sheet attribute supported by the browser.

 

In practice, however, a style object that you access through an HTML element object's style property is limited in scope: It reflects only the CSS settings explicitly defined in the element's tag via the style attribute or settings assigned to the element's style property via script. But other style sheets associated with the browser (internal style sheets) and the document (explicit style sheet rules defined in the <style> element and rules imported through either a link element or an @import rule) also affect the rendered characteristics of the element. A union of all style sheet attributes affecting an elementthe effective style definitionmay be read, but through browser-dependent syntax. IE uses the currentStyle property of an element, whereas Netscape 6 uses the W3C DOM window.getComputedStyle( ) method. Both syntaxes return an object that lets scripts inspect the value of each effective style attribute value.

 

While the three IE style-related objects (style, currentStyle, and runtimeStyle) return a style object with properties that expose CSS style attributes, the situation is a little more complex on the Netscape 6 side. On the one hand, Netscape 6 implements a version of the W3C DOM CSSStyleDeclaration object that exposes all the CSS attributes as properties. This is the version accessed through an element object's style property (just like IE, thus making an element object's style property work cross-browser). But when you read the effective style sheet (via window.getComputedStyle( )), the object that comes back does not expose the CSS attributes directly as properties. Instead, you must use the CSSStyleDeclaration methods (listed below) to inspect a specific attribute value by name. It's a longer way to reach a particular effective style attribute value, but very much in keeping with other attribute-reading syntax deployed throughout the W3C DOM. The only time this cross-browser disconnect affects you is when you need to view the effective style attribute for an unmodified style. Once you set an attribute value via the element object's style property, you can read it from the style property cross-browser.

 

This section lists the available style object properties plus the Netscape 6 (W3C DOM) formal methods for accessing those attributes. The W3C DOM lists a large percentage of the style object properties under an object umbrella called CSS2Properties. The specification offers the CSS2Properties object as an optional convenience for browsers. Fortunately for cross-browser scripters, Netscape 6 implements CSS2Properties at least for the element object style property.

 

The properties of the style object listed below correspond to the CSS attributes.

 
Object Model Reference
 
  • [window.]document.getElementById("elementID").style
  • [window.]document.styleSheets[i].rules[j].style
  • [window.]document.styleSheets[i].cssRules[j].style
 
Object-Specific Properties
 
accelerator azimuth background
backgroundAttachment backgroundColor backgroundImage
backgroundPosition backgroundPositionX backgroundPositionY
backgroundRepeat behavior blockDirection
border borderBottom borderBottomColor
borderBottomStyle borderBottomWidth borderCollapse
borderColor borderLeft borderLeftColor
borderLeftStyle borderLeftWidth borderRight
borderRightColor borderRightStyle borderRightWidth
borderSpacing borderStyle borderTop
borderTopColor borderTopStyle borderTopWidth
borderWidth bottom captionSide
clear clip clipBottom
clipLeft clipRight clipTop
color content counterIncrement
counterReset cssFloat cssText
cue cueAfter cueBefore
cursor direction display
elevation emptyCells filter
font fontFamily fontSize
fontSizeAdjust fontStretch fontStyle
fontVariant fontWeight height
imeMode layoutFlow layoutGrid
layoutGridChar layoutGridLine layoutGridMode
layoutGridType left letterSpacing
lineBreak lineHeight listStyle
listStyleImage listStylePosition listStyleType
margin marginBottom marginLeft
marginRight marginTop markerOffset
marks maxHeight maxWidth
minHeight minWidth MozBinding
MozOpacity orphans outline
outlineColor outlineStyle outlineWidth
overflow overflowX overflowY
padding paddingBottom paddingLeft
paddingRight paddingTop page
pageBreakAfter pageBreakBefore pageBreakInside
pause pauseAfter pauseBefore
pitch pitchRange pixelBottom
pixelHeight pixelLeft pixelRight
pixelTop pixelWidth playDuring
posBottom posHeight posLeft
posRight posTop posWidth
position quotes richness
right rubyAlign rubyOverhang
rubyPosition scrollbar3dLightColor scrollbarArrowColor
scrollbarBaseColor scrollbarDarkShadowColor scrollbarFaceColor
scrollbarHighlightColor scrollbarShadowColor scrollbarTrackColor
size speak speakHeader
speakNumeral speakPunctuation speechRate
stress styleFloat tableLayout
textAlign textAlignLast textAutospace
textDecoration textDecorationBlink textDecorationLineThrough
textDecorationNone textDecorationOverline textDecorationUnderline
textIndent textJustify textKashidaSpace
textOverflow textShadow textTransform
textUnderlinePosition top unicodeBidi
verticalAlign visibility voiceFamily
volume whiteSpace widows
width wordBreak wordSpacing
wordWrap writingMode zIndex
zoom    
 
Object-Specific Methods
 
getPropertyCSSValue( ) getPropertyPriority( ) getPropertyValue( )
item( ) removeProperty( ) setProperty( )
 
Object-Specific Event Handler Properties

None.

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