ExtJS TreeCheckNodeUI组件的使用 示例
效果：
创建调用的HTML:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title></title>
<link rel="stylesheet" type="text/css" href="extjs/resources/css/ext-all.css" />
<script type="text/javascript" src="extjs/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="extjs/ext-all.js"></script>
<script type="text/javascript" src="TreeCheckNodeUI.js"></script>
<script type="text/javascript" src="test.js"></script>
<style type="text/css">
</style>
<script>
Ext.onReady(function() {
var tree = new Ext.tree.TreePanel({
renderTo : document.body,
//el:'tree-ct',
width:568,
height:300,
checkModel: 'cascade', //对树的级联多选
onlyLeafCheckable: false,//对树所有结点都可选
animate: false,
rootVisible: false,
autoScroll:true,
loader: new Ext.tree.TreeLoader({
url :'./test.js',
baseAttrs: { uiProvider: Ext.ux.TreeCheckNodeUI } //添加 uiProvider 属性
}),
root: new Ext.tree.AsyncTreeNode({ id:'0' })
});
tree.on("check",function(node,checked){alert(node.text+" = "+checked)}); //注册"check"事件
//tree.render();
});</script>
</head>
<body></body>
</html>
test.js
[{
id: 1,
text: '子节点1',
leaf: true
},{
id: 2,
text: '儿子节点2',
children: [{
id: 3,
text: '孙子节点',
leaf: true
}]
}]
备注：
得放上服务下，不然test.js不能返回值噢！
TreeCheckNodeUI.js源码：
/**
* @class Ext.ux.TreeCheckNodeUI
* @extends Ext.tree.TreeNodeUI
*
* 对 Ext.tree.TreeNodeUI 进行checkbox功能的扩展,后台返回的结点信息不用非要包含checked属性
*
* 扩展的功能点有：
* 一、支持只对树的叶子进行选择
* 只有当返回的树结点属性leaf = true 时，结点才有checkbox可选
* 使用时，只需在声明树时，加上属性 onlyLeafCheckable: true 既可，默认是false
*
* 二、支持对树的单选
* 只允许选择一个结点
* 使用时，只需在声明树时，加上属性 checkModel: "single" 既可
*
* 二、支持对树的级联多选
* 当选择结点时，自动选择该结点下的所有子结点，或该结点的所有父结点（根结点除外），特别是支持异步，当子结点还没显示时，会从后台取得子结点，然后将其选中/取消选中
* 使用时，只需在声明树时，加上属性 checkModel: "cascade" 或"parentCascade"或"childCascade"既可
*
* 三、添加"check"事件
* 该事件会在树结点的checkbox发生改变时触发
* 使用时，只需给树注册事件,如：
* tree.on("check",function(node,checked){...});
*
* 默认情况下，checkModel为'multiple'，也就是多选，onlyLeafCheckable为false，所有结点都可选
*
* 使用方法：在loader里加上 baseAttrs:{uiProvider:Ext.ux.TreeCheckNodeUI} 既可.
* 例如：* var tree = new Ext.tree.TreePanel({
* el:'tree-ct',
* width:568,
* height:300,
* checkModel: 'cascade', //对树的级联多选
* onlyLeafCheckable: false,//对树所有结点都可选
* animate: false,
* rootVisible: false,
* autoScroll:true,
* loader: new Ext.tree.DWRTreeLoader({
* dwrCall:Tmplt.getTmpltTree,
* baseAttrs: { uiProvider: Ext.ux.TreeCheckNodeUI } //添加 uiProvider 属性
* }),
* root: new Ext.tree.AsyncTreeNode({ id:'0' })
* });
* tree.on("check",function(node,checked){alert(node.text+" = "+checked)}); //注册"check"事件
* tree.render();
*
*/Ext.ux.TreeCheckNodeUI = function() {
//多选: 'multiple'(默认)
//单选: 'single'
//级联多选: 'cascade'(同时选父和子);'parentCascade'(选父);'childCascade'(选子)
this.checkModel = 'multiple';
//only leaf can checked
this.onlyLeafCheckable = false;
Ext.ux.TreeCheckNodeUI.superclass.constructor.apply(this, arguments);
};Ext.extend(Ext.ux.TreeCheckNodeUI, Ext.tree.TreeNodeUI, {
renderElements : function(n, a, targetNode, bulkRender){
var tree = n.getOwnerTree();
this.checkModel = tree.checkModel || this.checkModel;
this.onlyLeafCheckable = tree.onlyLeafCheckable || false;
// add some indent caching, this helps performance when rendering a large tree
this.indentMarkup = n.parentNode ? n.parentNode.ui.getChildIndent() : ''; //var cb = typeof a.checked == 'boolean';
var cb = (!this.onlyLeafCheckable || a.leaf);
var href = a.href ? a.href : Ext.isGecko ? "" : "#";
var buf = ['<li class="x-tree-node"><div ext:tree-node-id="',n.id,'" class="x-tree-node-el x-tree-node-leaf x-unselectable ', a.cls,'" unselectable="on">',
'<span class="x-tree-node-indent">',this.indentMarkup,"</span>",
'<img src="', this.emptyIcon, '" class="x-tree-ec-icon x-tree-elbow" />',
'<img src="', a.icon || this.emptyIcon, '" class="x-tree-node-icon',(a.icon ? " x-tree-node-inline-icon" : ""),(a.iconCls ? " "+a.iconCls : ""),'" unselectable="on" />',
cb ? ('<input class="x-tree-node-cb" type="checkbox" ' + (a.checked ? 'checked="checked" />' : '/>')) : '',
'<a hidefocus="on" class="x-tree-node-anchor" href="',href,'" tabIndex="1" ',
a.hrefTarget ? ' target="'+a.hrefTarget+'"' : "", '><span unselectable="on">',n.text,"</span></a></div>",
'<ul class="x-tree-node-ct" style="display:none;"></ul>',
"</li>"].join(''); var nel;
if(bulkRender !== true && n.nextSibling && (nel = n.nextSibling.ui.getEl())){
this.wrap = Ext.DomHelper.insertHtml("beforeBegin", nel, buf);
}else{
this.wrap = Ext.DomHelper.insertHtml("beforeEnd", targetNode, buf);
}
this.elNode = this.wrap.childNodes[0];
this.ctNode = this.wrap.childNodes[1];
var cs = this.elNode.childNodes;
this.indentNode = cs[0];
this.ecNode = cs[1];
this.iconNode = cs[2];
var index = 3;
if(cb){
this.checkbox = cs[3];
Ext.fly(this.checkbox).on('click', this.check.createDelegate(this,[null]));
index++;
}
this.anchor = cs[index];
this.textNode = cs[index].firstChild;
},
// private
check : function(checked){
var n = this.node;
var tree = n.getOwnerTree();
this.checkModel = tree.checkModel || this.checkModel;
if( checked === null ) {
checked = this.checkbox.checked;
} else {
this.checkbox.checked = checked;
}
n.attributes.checked = checked;
tree.fireEvent('check', n, checked);
if(this.checkModel == 'single'){
var checkedNodes = tree.getChecked();
for(var i=0;i<checkedNodes.length;i++){
var node = checkedNodes[i];
if(node.id != n.id){
node.getUI().checkbox.checked = false;
node.attributes.checked = false;
tree.fireEvent('check', node, false);
}
}
} else if(!this.onlyLeafCheckable){
if(this.checkModel == 'cascade' || this.checkModel == 'parentCascade'){
var parentNode = n.parentNode;
if(parentNode !== null) {
this.parentCheck(parentNode,checked);
}
}
if(this.checkModel == 'cascade' || this.checkModel == 'childCascade'){
if( !n.expanded && !n.childrenRendered ) {
n.expand(false,false,this.childCheck);
}else {
this.childCheck(n);
}
}
}
},
// private
childCheck : function(node){
var a = node.attributes;
if(!a.leaf) {
var cs = node.childNodes;
var csui;
for(var i = 0; i < cs.length; i++) {
csui = cs[i].getUI();
if(csui.checkbox.checked ^ a.checked)
csui.check(a.checked);
}
}
},
// private
parentCheck : function(node ,checked){
var checkbox = node.getUI().checkbox;
if(typeof checkbox == 'undefined')return ;
if(!(checked ^ checkbox.checked))return;
if(!checked && this.childHasChecked(node))return;
checkbox.checked = checked;
node.attributes.checked = checked;
node.getOwnerTree().fireEvent('check', node, checked);
var parentNode = node.parentNode;
if( parentNode !== null){
this.parentCheck(parentNode,checked);
}
},
// private
childHasChecked : function(node){
var childNodes = node.childNodes;
if(childNodes || childNodes.length>0){
for(var i=0;i<childNodes.length;i++){
if(childNodes[i].getUI().checkbox.checked)
return true;
}
}
return false;
},
toggleCheck : function(value){
var cb = this.checkbox;
if(cb){
var checked = (value === undefined ? !cb.checked : value);
this.check(checked);
}
}
});
