ExtJs动态生成treepanel的Json格式

在节点中加上"checked"属性，会自动生成checkbox。

获取选中节点

var nodeArray = "";

var nodesObj = mytree.getChecked();

var i;var length=nodesObj .length;
for (i = 0; i < length; i++) {
nodeArray += nodesObj[i].id + ',';     //允许多选的情况。如果不允许多选，就直接nodesObj[i].id 
}

nodeArray = nodeArray.substring(0, nodeArray.length - 1);  

Json格式如下：

[
    {
        "text":"To Do",
        "cls":"folder",
        "expanded":true,
        "children":[
            {
                "text":"Go jogging",
                "leaf":true,
                "checked":true
            },
            {
                "text":"Take a nap",
                "leaf":true,
                "checked":false
            },
            {
                "text":"Climb Everest",
                "leaf":true,
                "checked":false
            }
        ]
    },
    {
        "text":"Grocery List",
        "cls":"folder",
        "children":[
            {
                "text":"Bananas",
                "leaf":true,
                "checked":false
            },
            {
                "text":"Milk",
                "leaf":true,
                "checked":false
            },
            {
                "text":"Cereal",
                "leaf":true,
                "checked":false
            },
            {
                "text":"Energy foods",
                "cls":"folder",
                "children":[
                    {
                        "text":"Coffee",
                        "leaf":true,
                        "checked":false
                    },
                    {
                        "text":"Red Bull",
                        "leaf":true,
                        "checked":false
                    }
                ]
            }
        ]
    },
    {
        "text":"Remodel Project",
        "cls":"folder",
        "children":[
            {
                "text":"Finish the budget",
                "leaf":true,
                "checked":false
            },
            {
                "text":"Call contractors",
                "leaf":true,
                "checked":false
            },
            {
                "text":"Choose design",
                "leaf":true,
                "checked":false
            }
        ]
    }
]