treecheck

 Ext.BLANK_IMAGE_URL = "ext/resources/images/default/s.gif";
   var Tree = Ext.tree;    
	var tree = new Tree.TreePanel({    
        el:'tree-div',    
        useArrows:true,    
        autoScroll:true,    
        animate:true,    
        enableDD:true,    
        containerScroll: true,     
        loader: new Tree.TreeLoader({    
        dataUrl:'treecheckjson.jsp'   
        })    
    });    

     tree.on('checkchange', function(node, checked) {       
        node.expand();       
        node.attributes.checked = checked;       
        node.eachChild(function(child) {       
            child.ui.toggleCheck(checked);       
            child.attributes.checked = checked;       
            child.fireEvent('checkchange', child, checked);       
        });       
    }, tree);    
    
    var root = new Tree.AsyncTreeNode({    
        text: 'Ext JS',    
        draggable:false, 
        checked:false,
        id:'0'   
    });    
    tree.setRootNode(root);   
    
    tree.render();    
    root.expand();  
 //带复选框(checkbox)的树   
//改编自ExtJs 自带的tree例子，选中父节点后，所有子节点会自动选上。
//该例子点击父节点如果速度过快，有时候不会自动选中子节点！

var checkedNodes = tree.getChecked();//tree必须事先创建好.
var s = [];
for(var i=0;i<checkedNodes.length;i++){
s.push(checkedNodes[i].id)
}   //得到里面选中的node id 值数组