jstree

jstree 主页 :
http://www.jstree.com/

其中提供了一种从后台取数据渲染成树的形式：

 

$("#mytree").tree({
      data  : {
        type  : "json",
        url : "${ctx}/user/power!list.do"
      }
});

对于url中返回的值必须是它定义的json数据形式:

$("#demo2").tree({
  data  : {
    type  : "json",
    json  : [ 
      { attributes: { id : "pjson_1" }, state: "open", data: "Root node 1", children : [
        { attributes: { id : "pjson_2" }, data: { title : "Custom icon", icon : "../media/images/ok.png" } },
        { attributes: { id : "pjson_3" }, data: "Child node 2" },
        { attributes: { id : "pjson_4" }, data: "Some other child node" }
      ]}, 
      { attributes: { id : "pjson_5" }, data: "Root node 2" } 
    ]
  }
});

这里需要一个从后台实例集合转换为它规定的json数据的形式.

/**
	 * 无限递归获得jsTree的json字串
	 * 
	 * @param parentId
	 *            父权限id 6.8日修改
	 * @return
	 */
	private String getJson(long parentId)
	{
		List<Authority> list = authorityManager.queryByParentId(parentId);
		for (int i = 0; i < list.size(); i++)
		{
			Authority au = list.get(i);
			if (au.getIshaschild() == 1)
			{
				str += "{attributes:{id:\"" + au.getAnid()
						+ "\"},state:\"open\",data:\"" + au.getAnname()
						+ "\" ,";
				str += "children:[";
				this.getJson(au.getAnid());
				str += "]";
				str += "   }";
			}
			else
			{
				str += "{attributes:{id:\"" + au.getAnid()
						+ "\"},state:\"open\",data:\"" + au.getAnname() + "\" "
						+ "   }";
			}
			if (i < list.size() - 1)
			{
				str += ",";
			}
		}
		return str;
	}

调用：

@org.apache.struts2.convention.annotation.Action(results =
     { @Result(name = "success", location = "/main/user/action-list.jsp") })
     public String list()
    {
         String str = "[";
         // 从根开始
         str += this.getJson(0);
         str += "]";
         this.renderJson(str);
         return null;
    }