DOM Selection - MDC

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出自Guoshuang Wiki

http://developer.mozilla.org/en/docs/DOM:Selection

Glossary

Other key terms used in this section.

anchor

   The anchor of a selection is the beginning point of the selection. When making a selection with a mouse, the anchor is where in the document the mouse button is initially pressed. As the user changes the selection using the mouse or the keyboard, the anchor does not move. 

focus

   The focus of a selection is the end point of the selection. When making a selection with a mouse, the focus is where in the document the mouse button is released. As the user changes the selection using the mouse or the keyboard, the focus is the end of the selection that moves. 

range

   A range is a contiguous part of a document. A range can contain entire nodes as well as portions of nodes, such as a portion of a text node. A user will normally only select a single range at a time, but it's possible for a user to select multiple ranges (e.g. by using the Control key). A range can be retrieved from a selection as a range object. Range objects can also be created via the DOM and programmatically added or removed from a selection. 

[edit] Properties

anchorNode

   Returns the node in which the selection begins. 

anchorOffset

   Returns the number of characters that the selection's anchor is offset within the anchorNode. 

focusNode

   Returns the node in which the selection ends. 

focusOffset

   Returns the number of characters that the selection's focus is offset within the focusNode. 

isCollapsed

   Returns a boolean indicating whether the selection's start and end points are at the same position. 

rangeCount

   Returns the number of ranges in the selection. 

[edit] Methods

getRangeAt

   Returns a range object representing one of the ranges currently selected. 

collapse

   Collapses the current selection to a single point. 

extend

   Moves the focus of the selection to a specified point. 

collapseToStart

   Moves the focus of the selection to the same point at the anchor. 

collapseToEnd

   Moves the anchor of the selection to the same point as the focus. The focus does not move. 

selectAllChildren

   Adds all the children of the specified node to the selection. 

addRange

   A range object that will be added to the selection. 

removeRange

   Removes a range from the selection. 

removeAllRanges

   Removes all ranges from the selection. 

deleteFromDocument

   Deletes the selection's content from the document. 

selectionLanguageChange toString

   Returns a string currently being represented by the selection object, i.e. the currently selected text. 

containsNode

   Indicates if a certain node is part of the selection.