absolutize(element) -> HTMLElement

Turns element into an absolutely-positioned element without changing its position in the page layout.

addClassName(element, className) -> HTMLElement 

Adds a CSS class to element.

Element.adjacent(element[, selectors...]) -> [HTMLElement...]
someElement.adjacent([selectors...]) -> [HTMLElement...]

Finds all siblings of the current element that match the given selector(s).

ancestors(element) -> [HTMLElement...]

Collects all of element’s ancestors and returns them as an array of extended elements.

childElements(element) -> [HTMLElement...]

Collects all of the element's children and returns them as an array of extended elements.

classNames(element) -> Enumerable

Returns a new instance of ClassNames, an Enumerable object used to read and write CSS class names of element.

cleanWhitespace(element) -> HTMLElement

Removes all of element's text nodes which contain only whitespace. Returns element.

clonePosition(element, source[, options]) -> HTMLElement

Clones the position and/or dimensions of source onto element as defined by the optional argument options.

cumulativeOffset(element) -> [Number, Number] also accessible as { left: Number, top: Number }

Returns the offsets of element from the top left corner of the document.

cumulativeScrollOffset(element) -> [Number, Number] also accessible as { left: Number, top: Number }

Calculates the cumulative scroll offset of an element in nested scrolling containers.

descendantOf(element, ancestor) -> Boolean 

Checks if element is a descendant of ancestor.

descendants(element) -> [HTMLElement...]

Collects all of element’s descendants and returns them as an array of extended elements.

down(element[, cssRule][, index = 0]) -> HTMLElement | undefined

Returns element’s first descendant (or the n-th descendant if index is specified) that matches cssRule. If no cssRule is provided, all descendants are considered. If no descendant matches these criteria, undefined is returned.

empty(element) -> Boolean

Tests whether element is empty (i.e. contains only whitespace).

fire(eventName[, memo]) -> Event

Fires a custom event with the current element as its target.

firstDescendant(element) -> HTMLElement

Returns the first child that is an element. This is opposed to firstChild DOM property which will return any node (whitespace in most usual cases).

getDimensions(element) -> {height: Number, width: Number}

Finds the computed width and height of element and returns them as key/value pairs of an object.

getElementsByClassName(element, className) -> [HTMLElement...]

Fetches all of element’s descendants which have a CSS class of className and returns them as an array of extended elements.

getElementsBySelector(element, selector...) -> [HTMLElement...]

Takes an arbitrary number of CSS selectors (strings) and returns an array of extended children of element that match any of them.

getHeight(element) -> Number

Finds and returns the computed height of element.

getOffsetParent(element) -> HTMLElement

Returns element’s closest positioned ancestor. If none is found, the body element is returned.

getStyle(element, property) -> String | null

Returns the given CSS property value of element. property can be specified in either of its CSS or camelized form.

getWidth(element) -> Number

Finds and returns the computed width of element.

hasClassName(element, className) -> Boolean

Checks whether element has the given CSS className.

hide(element) -> HTMLElement

Hides and returns element.

identify(element) -> id

returns element’s id attribute if it exists, or sets and returns a unique, auto-generated id.

immediateDescendants(element) -> [HTMLElement...]

Collects all of the element’s immediate descendants (i.e. children) and returns them as an array of extended elements.

insert(element, { position: content }) -> HTMLElement
insert(element, content) -> HTMLElement

Inserts content before, after, at the top of, or at the bottom of element, as specified by the position property of the second argument. If the second argument is the content itself, insert will append it to element.

inspect(element) -> String

Returns the debug-oriented string representation of element.

makeClipping(element) -> HTMLElement

Simulates the poorly supported CSS clip property by setting element's overflow value to 'hidden'. Returns element.

makePositioned(element) -> HTMLElement

Allows for the easy creation of CSS containing block by setting element's CSS position to 'relative' if its initial position is either 'static' or undefined. Returns element.

match(element, selector) -> Boolean

Checks if element matches the given CSS selector.

next(element[, cssRule][, index = 0]) -> HTMLElement | undefined

Returns element’s following sibling (or the index’th one, if index is specified) that matches cssRule. If no cssRule is provided, all following siblings are considered. If no following sibling matches these criteria, undefined is returned.

nextSiblings(element) -> [HTMLElement...]

Collects all of element’s next siblings and returns them as an array of extended elements.

Element.observe(element, eventName, handler) -> HTMLElement
someElement.observe(eventName, handler) -> HTMLElement

Registers an event handler on element and returns element.

positionedOffset(element) -> [Number, Number] also accessible as { left: Number, top: Number }

Returns element’s offset relative to its closest positioned ancestor (the element that would be returned by Element#getOffsetParent).

previous(element[, cssRule][, index = 0]) -> HTMLElement | undefined

Returns element's previous sibling (or the index'th one, if index is specified) that matches cssRule. If no cssRule is provided, all previous siblings are considered. If no previous sibling matches these criteria, undefined is returned.

previousSiblings(element) -> [HTMLElement...]

Collects all of element’s previous siblings and returns them as an array of extended elements.

readAttribute(element, attribute) -> String | null

Returns the value of element's attribute or null if attribute has not been specified.

recursivelyCollect(element, property) -> [HTMLElement...]

Recursively collects elements whose relationship is specified by property. property has to be a property (a method won’t do!) of element that points to a single DOM node. Returns an array of extended elements.

relativize(element) -> HTMLElement

Turns element into an relatively-positioned element without changing its position in the page layout.

remove(element) -> HTMLElement

Completely removes element from the document and returns it.

removeClassName(element, className) -> HTMLElement

Removes element’s CSS className and returns element.

replace(element[, html]) -> HTMLElement

Replaces element by the content of the html argument and returns the removed element.

scrollTo(element) -> HTMLElement

Scrolls the window so that element appears at the top of the viewport. Returns element.

select(element, selector...) -> [HTMLElement...]

Takes an arbitrary number of CSS selectors (strings) and returns an array of extended descendants of element that match any of them.

Element.setOpacity(element, opacity) -> [HTMLElement...]
someElement.setOpacity(opacity) -> [HTMLElement...]

Sets the visual opacity of an element while working around inconsistencies in various browsers. The opacity argument should be a floating point number, where the value of 0 is fully transparent and 1 is fully opaque.

setStyle(element, styles) -> HTMLElement

Modifies element’s CSS style properties. Styles are passed as a hash of property-value pairs in which the properties are specified in their camelized form.

show(element) -> HTMLElement

Displays and returns element.

siblings(element) -> [HTMLElement...]

Collects all of element’s siblings and returns them as an array of extended elements.

stopObserving(element, eventName, handler) -> HTMLElement

Unregisters handler and returns element.

toggle(element) -> HTMLElement

Toggles the visibility of element.

toggleClassName(element, className) -> HTMLElement

Toggles element’s CSS className and returns element.

undoClipping(element) -> HTMLElement

Sets element’s CSS overflow property back to the value it had before Element.makeClipping() was applied. Returns element.

undoPositioned(element) -> HTMLElement

Sets element back to the state it was before Element.makePositioned was applied to it. Returns element.

up(element, [cssRule][, index = 0]) -> HTMLElement | undefined

Returns element’s first ancestor (or the index’th ancestor, if index is specified) that matches cssRule. If no cssRule is provided, all ancestors are considered. If no ancestor matches these criteria, undefined is returned.

update(element[, newContent]) -> HTMLElement

Replaces the content of element with the provided newContent argument and returns element.

viewportOffset(element) -> [Number, Number] also accessible as { left: Number, top: Number }

Returns the X/Y coordinates of element relative to the viewport.

visible(element) -> Boolean

Returns a Boolean indicating whether or not element is visible (i.e. whether its inline style property is set to "display: none;").

Element.wrap(element, wrapper[, attributes]) -> HTMLElement
someElement.wrap(wrapper[, attributes]) -> HTMLElement

Wraps an element inside another, then returns the wrapper.

writeAttribute(element, attribute[, value = true]) -> HTMLElement
writeAttribute(element, attributes) -> HTMLElement

Adds, specifies or removes attributes passed as either a hash or a name/value pair.