dhtmlxtree 如何得到xml,json等文件中的自定义的属性值

先看代码：

var TreeForJSON = new dhtmlXTreeObject('TreeForJSON', '100%', '100%', 0);
TreeForJSON.setImagePath("dhtmlx/codebase/imgs/csh_vista/");
TreeForJSON.enableDragAndDrop(true);
TreeForJSON.enableKeyboardNavigation(true)
TreeForJSON.loadJSONObject({id:0,
        item:[
            {id:1,text:"first",userdata:[{name:'url',content:'http://g.cn#1'}]},
            {id:2, text:"middle",userdata:[{name:'url',content:'http://g.cn#2'}],
                item:[
                    {id:"21", text:"child",userdata:[{name:'url',content:'http://g.cn#3'}]}
                ]},
            {id:3,text:"last",userdata:[{name:'url',content:'空'}]}
        ]
    }
);
TreeForJSON.setOnClickHandler(TestOnClick);
function TestOnClick(id){
    var url = (TreeForJSON.getUserData(id, "url"));
    alert(url);
}

dhtmlxTree中的loadJSONObject方法也是支持userdata属性的,只是写法特殊一点
取值时是通过当前ID去找userdatea下的name,如代码中的url,然后获取其content内容,即http://g.cn...
同理,使用这个方法可以自定义更多的属性

userdata:[{name:'type',content:'1'},{name:'remark',content:'空'}]

dhtmlXTree API

Methods

assignKeys	configures the keys used for keyboard navigation
attachEvent	adds any user-defined handler to available events
changeItemId	changes the item's id
clearCut	cancels marking an item as cut
clearSelection	unselects the item in the tree
closeAllItems	collapses target node and all sub nodes
closeItem	collapses a node
deleteChildItems	deletes all children of the node
deleteItem	deletes a node
destructor	deletes tree and clears memory
detachEvent	detaches a handler from an event
disableCheckbox	disables a checkbox
doCut	marks the selected item as cut
doPaste	inserts the previously cut branch
editItem	opens editor for the specified item
enableActiveImages	enables active images (clickable and dragable). By default only text part of the node is active
enableAutoSavingSelected	enables/disables autosaving selected node in cookies
enableAutoTooltips	enables auto tooltips (node text as tooltip)
enableCheckBoxes	shows/hides checkboxes (all checkboxes in the tree)
enableContextMenu	enables context menu
enableDistributedParsing	enables distributed parsing of a big tree (items loaded portion by portion with some timeouts)
enableDragAndDrop	enables/disables drag-and-drop
enableDragAndDropScrolling	enables/disables auto scrolling during the drag-and-drop operation
enableHighlighting	enables item highlighting (item's text is highlighted on mouseover)
enableIEImageFix	replaces IMG tag with background images - solves the problem with IE image caching, doesn't work for IE6 SP1
enableImageDrag	enables dragging an item by its image (by default an item is dragged by text)
enableItemEditor	enables editing of the item's text
enableKeySearch	enables searching of items by pressing keys
enableKeyboardNavigation	enables keyboard navigation in the tree
enableLoadingItem	enables/disables "Loading..." item
enableMercyDrag	enables dragging without removing (copies instead of moving)
enableMultiLineItems	enables multiline items
enableMultiselection	enables multiselection
enableRTL	enables Right-to-Left mode in the tree
enableRadioButtons	replaces checkboxes with radio buttons
enableSingleRadioMode	replaces checkboxes with radio buttons
enableSmartCheckboxes	enables smart checkboxes
enableSmartRendering	enables smart rendering mode
enableSmartXMLParsing	enables/disables smart XML parsing mode
enableTextSigns	replaces images with text signs
enableThreeStateCheckboxes	enables three-state checkboxes
enableTreeImages	enables tree images
enableTreeLines	enables/disables tree lines (parent-child threads)
findItem	finds a tree item by text, selects it and focuses on it
findItemIdByLabel	finds a tree item by text
focusItem	scrolls Tree to the indicated item to make it visible and sets focus on it
getAllChecked	returns the list of ids of the nodes with checked checkboxes, separated by default delimiter
getAllCheckedBranches	returns the list of ids of the nodes with checked and three-state checkboxes, separated by default delimiter
getAllChildless	returns the list of all items which don't have child nodes
getAllItemsWithKids	returns the list of all items which have child nodes, separated by default delimiter
getAllPartiallyChecked	returns the list of ids of the nodes with three-state checkboxes, separated by default delimiter
getAllSubItems	returns the list of all children nested on all sublevels of the tree (in relation to the specified item)
getAllUnchecked	returns the list of identificators of the nodes with unchecked checkboxes, separated by default delimiter
getAttribute	returns the value of the specified item attribute
getChildItemIdByIndex	returns child node's id by index
getDistributedParsingState	gets the current state of distributed parsing
getIndexById	returns the node's index in the children collection by id
getItemColor	gets the color of the target item
getItemIdByIndex	returns the node's id by index
getItemImage	gets URL of the item's image
getItemParsingState	gets current parsing state of an item
getItemText	returns the node's text
getItemTooltip	gets item's tooltip
getLevel	gets the node's level (position in the hierarchy)
getOpenState	returns open/close state
getParentId	returns the parent item's id
getSelectedItemId	returns the selected item's id
getSelectedItemText	returns the selected node's text
getSubItems	returns a comma-delimited list of ids of all children nested on the sublevel in relation to the specified item
getUserData	gets user data from the target node
getXMLState	returns the current state of XML loading
hasChildren	returns the number of children
insertNewChild	creates a new node as a child to the specified one with parentId
insertNewItem	creates a new node as a child to the specified one with parentId
insertNewNext	creates a new node next to the specified one
isItemChecked	gets the state of the node's checkbox
isLocked	returns "true" if the item is locked
load	loads data to the component via XML or JSON, usually data-values pairs
loadCSV	loads tree from csv file/stream
loadCSVString	loads tree from csv string
loadJSArray	loads tree from js array object
loadJSArrayFile	loads tree from js array file/stream
loadJSON	loads tree from json file
loadJSONObject	loads dhtmlxTree from a JSON object
loadOpenStates	restores open nodes from cookie
loadState	loads tree from cookie
loadXML	loads tree from xml file
loadXMLString	loads tree from xml string
lockItem	locks/unlocks an item
lockTree	locks tree
makeAllDraggable	adds drag-n-drop capabilities to all HTML items with dragInDhtmlXTree attribute
makeDraggable	adds drag-n-drop capabilities (with the possibility to drop into dhtmlxTree) to HTML object
moveItem	moves an item (inside of tree)
openAllItems	expands target node and all sub-nodes
openAllItemsDynamic	expands target node and all child nodes (the same as openAllItems, but works in dynamic trees)
openItem	expands a node
openItemsDynamic	expands the list of nodes in dynamic tree (wait till the end of a node's loading before expanding the next one)
openOnItemAdded	configures if parent node will be expanded immediately after a child item has been added
parse	loads data from a local datasource (XML string, CSV string, XML island, XML object, JSON object, javascript array)
preventIECaching	prevents caching in IE by adding a random value to URL string
refreshItem	refreshes a tree branch from XML
refreshItems	refreshes the specified tree nodes (gets XML from server and updates only the nodes included into itemIdList)
registerXMLEntity	registers XML entity for replacement during the initialization (the default entities are: ampersand, less-than and greater-than symbols)
restoreSelectedItem	restores the selected item from cookie
saveOpenStates	saves open nodes to cookie
saveSelectedItem	saves the selected item to cookie
saveState	saves tree to cookie
selectItem	selects the specified node (and optionally fires the onClick event)
serializeTree	gets xml representation (as string) of tree
serializeTreeToJSON	returns tree as json string
setAttribute	sets an attribute for an item
setCheck	sets the state of a node's checkbox
setChildCalcHTML	sets children calculation prefix and postfix
setChildCalcMode	sets children calculation mode
setCustomSortFunction	sets custom sort function which has two parameters - id_of_item1,id_of_item2
setDataMode	sets a default data transfer mode
setDragBehavior	sets Drag-And-Drop behavior (child - drop as child, sibling - drop as sibling, complex - complex drop behaviour)
setEditStartAction	defines which events must start the process of editing
setEscapingMode	sets escaping mode (used for escaping ID in requests)
setIconSize	sets the size of icons
setIconsPath	defines path to the icons folder
setImageArrays	sets the images used for parent-child threads drawing (lines, plus, minus)
setImagesPath	defines path to the imgs folder
setItemCloseable	prevents a node from closing
setItemColor	sets the color of the node's text
setItemContextMenu	sets context menu for individual nodes
setItemImage	sets item's icons (mostly useful for childless nodes)
setItemStyle	sets an individual item's style
setItemText	sets a new node's text (HTML is allowed)
setItemTopOffset	sets the top offset for an item
setListDelimeter	sets list separator ("," by default)
setLockedIcons	sets an icon for locked items
setSerializationLevel	configures XML serialization
setSkin	set skin for the component
setStdImages	sets default images for nodes (must be called before XML loading)
setSubChecked	changes the state of the node's checkbox and all children checkboxes
setUserData	sets user data for the target node
setXMLAutoLoading	enables dynamic loading from XML
setXMLAutoLoadingBehaviour	defines the mode of passing to the server the id of an item for which the data should be loaded during dynamic loading
showItemCheckbox	shows/hides a checkbox for a tree item
showItemSign	shows/hides (+/-) an icon
smartRefreshBranch	refreshes the specified tree branch (gets XML from server, adds new nodes, removes unused nodes)
smartRefreshItem	refreshes the specified tree item (gets XML from server, adds new nodes, removes unused nodes)
sortTree	reorders items in the tree according to their text
stopEdit	switches the item which is currently being edited back to normal view
updateItem	updates item's properties

Events

onAllOpenDynamic	fires when all sub levels is loaded and opened
onBeforeCheck	fires before an item is checked/unchecked
onBeforeContextMenu	fires before the moment when a context menu appears on the right mouse click
onBeforeDrag	fires when the item's dragging starts (the item is selected and the mouse is moving)
onCheck	fires immediately after an item in the tree has been checked/unchecked
onClick	fires when the text part of a tree item is clicked, but after the default onClick functionality has been processed
onDblClick	fires right after a tree item has been double clicked, but before the default onDblClick functionality has been processed
onDrag	fires when the item was dragged and dropped on some other item, but before item's moving has been processed
onDragIn	fires when the item is dragged over some target the item can be dropped to
onDrop	fires when drag-and-drop has already been processed; besides, fires when the nodes are moved programmatically
onEdit	fires on 4 different stages of the editing process (see the details)
onEditCancel	event occurs after cancelling edit by Escape key or other means
onKeyPress	fires after each key press when tree is in focus
onMouseIn	fires when the mouse pointer is hovered over an item
onMouseOut	fires when the mouse pointer is moved out of item's area
onOpenDynamicEnd	fires after the item defined in the openItemsDynamic() method opens
onOpenEnd	fires right after an item in the tree has become open
onOpenStart	fires right when an item in the tree starts to open, but before this item has opened
onRightClick	fires when the user clicks the right mouse button
onSelect	fires when selection in the tree was changed
onXLE	fires when the data loading is finished and a component or data is rendered
onXLS	fires when XML loading started