## String / Number setting.data.simpleData.rootPId

### Overview[ depends on jquery.ztree.core js ]

Set the default value of root's 'pIdKey' specified attribute values​​. It is valid when [setting.data.simpleData.enable = true]

Default: null

### Examples of setting

#### 1. use the simple data format

    var setting = {
    	data: {
    		simpleData: {
    			enable: true,
    			idKey: "id",
    			pIdKey: "pId",
    			rootPId: 0
    		}
    	}
    };
    var treeNodes = [
        {"id":1, "pId":0, "name":"test1"},
        {"id":11, "pId":1, "name":"test11"},
        {"id":12, "pId":1, "name":"test12"},
        {"id":111, "pId":11, "name":"test111"}
    ];
    ......