标签：tps select root ring pos post pen table strong
1.easyui之dataGrid分页加载数据例子
注意：1）分页表格通过url获得数据会提交page,rows两个参数；后台需要获取这两个参数并且由此得到
int pageSize=rows/page;//每页记录数
int pageNum=page;//当前页面
之后获得分页数据可用sql：............LIMIT "+(pageNum-1)*pageSize+","+pageSize;放回需要的指定页面数据
2）后台代码需要放回固定格式的json数据{"total":28,"rows":[{},{},{}]}类似这个格式
可以用com.alibaba.fastjson.JSONObject fastjson工具处理json数据；
一般我们常用这个工具俩个对象：JSONObject;JSONArray具体用法下面代码有
1.前端代码
<div id="tt"></div>
<script>
$(‘#tt‘).datagrid({
singleSelect : true,
loadMsg:‘数据加载中请稍后……‘,
pagination: true,
rownumbers: true,
fitColumns : true,
width:‘auto‘ ,
columns:[[
{field:‘id‘,title: ‘id‘,align: ‘left‘},
{field:‘pid‘,title: ‘pid‘,align: ‘left‘},
{field:‘level‘,title: ‘level‘,align: ‘left‘},
{field:‘code‘,title: ‘code‘,align: ‘left‘},
{field:‘name‘,title: ‘name‘,align: ‘left‘},
]],
url:‘sysMgrController.do?showSSQTableBypid&pid=‘+pid//通过url放回json数
})
</script> 2.java后台代码
@RequestMapping(params = "showSSQTableBypid", method = RequestMethod.POST)
@ResponseBody
public JSONObject showSSQTableBypid(int page,int rows,Integer pid,HttpServletRequest request, HttpServletResponse response) throws NoSuchFieldException, Exception {
JSONObject result=new JSONObject();
int pageSize=rows/page;//每页记录数
int pageNum=page;//当前页面
String sql="SELECT id AS id,pid AS pid,level AS level,code AS code,name AS name FROM ty_conf_division WHERE pid="+pid+" LIMIT"+(pageNum-1)*pageSize+","+pageSize ;
List<Map<String, Object>> rows1=sysMgrServiceI.findForJdbc(sql);
//获得总的记录数
String totalPage = "select count(1) as count from ty_conf_division where pid="+pid;
Map<String, Object> count = sysMgrServiceI.findOneForJdbc(totalPage);
int total=Integer.parseInt(String.valueOf(count.get("count")));
result.put("total", total);
result.put("rows", rows1);
return result;
}
2.easyui tree异步加载json数据例子：其中很多事件方法可以利用
1）注意：tree异步加载数据
tree控件对异步加载数据有个机制：在展开节点时会自动发送节点id参数到后台，后台可以获取这个参数加载节点下的数据
符合tree的json格式类似于：
[{ "id": 1, "text": "Node 1", "state": "closed", "children": [{ "id": 11, "text": "Node 11" },{ "id": 12, "text": "Node 12" }] },{ "id": 2, "text": "Node 2", "state": "closed" }]
2）例子：
主要思想：根据节点参数id，查询子节点所有对象，再通过JSONObject封装子节点对象，再将所有的子节点对象加入JSONArray对象中放回就是符合tree格式的json数据了
前台部分代码 <ul id="provinceCityArea"></ul> <script> $("#provinceCityArea").tree({ checbox:true, url:"sysMgrController.do?showSSQTree", animate:true, checkbox:true, onClick: function(node){ //dosomething }, }); </script> 后台部分代码 @RequestMapping(params = "showSSQTree", method = RequestMethod.POST) @ResponseBody public JSONArray showSSQTree(Integer id,HttpServletRequest request, HttpServletResponse response) throws NoSuchFieldException, Exception { //返回满足Tree需要的Json类型数据 JSONArray result=new JSONArray(); //处理id if((id==null)||"".equals(id)) { JSONObject rootObject = new JSONObject(); rootObject.put("id", 0); rootObject.put("text", "全部"); rootObject.put("state", "closed"); rootObject.put("attributes", "{‘pid‘:"+0+"}"); result.add(rootObject); } String sql="SELECT id AS id,pid AS pid,level AS level,code AS code,name AS name FROM ty_conf_division WHERE pid="+id; List<Map<String, Object>> list2=sysMgrServiceI.findForJdbc(sql); for (Map<String, Object> map : list2) { JSONObject tree=new JSONObject(); int id1=Integer.parseInt(String.valueOf(map.get("id"))); String text=String.valueOf(map.get("name")); int pid=Integer.parseInt(String.valueOf(map.get("pid")));//父节点 tree.put("id", id1); tree.put("text",text); tree.put("attributes", "{‘pid‘:"+pid+"}"); //判断是否有子节点，如果有则closed否则open String hasChilds="SELECT count(1) FROM ty_conf_division WHERE pid="+id1; Long count=sysMgrServiceI.getCountForJdbc(hasChilds); if(count==0){ tree.put("state","open"); }else{ tree.put("state","closed"); } result.add(tree); } return result; }
标签：tps select root ring pos post pen table strong
原文地址：http://www.cnblogs.com/xiaoping1993/p/7077284.html
