ASP.NET MVC异步获取和刷新ExtJS6 TreeStore

2017-02-15 .NET
这篇文章主要为大家详细介绍了ASP.NET MVC异步获取和刷新ExtJS6 TreeStore的相关资料,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

从数据库获取构造树结构是ExtJS TreePanel的核心技术,常用方法是TreeStroe里配置proxy,这种方式的root成了一个不受控制的节点。

TreeStroe的root实际是一个层叠json数据,大部分情况是直接写一些简单数据,但在实际应用中必定是要从数据库读取的。我的方法是先用Ext.Ajax.request获取root数据形成TreeStroe。定义一个全局的TreeStroe名字是mTreeStore,用Ext.Ajax.request获得root数据。TreeStoreRefresh函数与此类似,将mTreeStore的root换为新值。TreePanel的rootVisible属性必须为true,增加一个节点单击事件显示节点的信息。

var mTreeStore = null;
Ext.Ajax.request({
  async: false,
  url: '/api/BasicData_API/GetBasicTablesTreeSource',
  method: 'get',
  success: function (response, options)
  {
   var TreeRoot = Ext.decode(response.responseText);
   mTreeStore = Ext.create('Ext.data.TreeStore',
   {
    root: TreeRoot
   });
  },
  failure: function (response, options)
  {
   //var responseArray = Ext.decode(response.responseText);
   Ext.Msg.alert('服务器错误', '数据处理错误原因:\n\r' + response.responseText);
  }
});
 
function TreeStoreRefresh()
{
 Ext.Ajax.request({
  async: false,
  url: '/api/BasicData_API/GetBasicTablesTreeSource',
  method: 'get',
  success: function (response, options)
  {
   var TreeRoot = Ext.decode(response.responseText);
   if (mTreeStore != null)
   {
    mTreeStore.setRoot(TreeRoot);
   }
  },
  failure: function (response, options)
  {
   //var responseArray = Ext.decode(response.responseText);
   Ext.Msg.alert('服务器错误', '数据处理错误原因:\n\r' + response.responseText);
  }
 });
}
 
Ext.define('TreeToolbarCls', {
 extend: 'Ext.toolbar.Toolbar',
 padding:'0 0 0 0',
 items: [{
  text: '刷新',
  iconCls: 'refresh',
  handler: TreeStoreRefresh,
  height: 30,
  width: 65
 }]
});
 
Ext.define('U1TreeCls',
{
 extend: 'Ext.tree.Panel',
 xtype: 'U1Tree_xtype',
 //title: '基础数据字典',
 rootVisible: true,
 width: 300,
 store: mTreeStore,
 scrollable: true,
 tbar:Ext.create('TreeToolbarCls'),
 listeners:
 {
  itemclick: NodeClick
 }
});
 
function NodeClick(node, record, item, index, e, eOpts)
{
 if (typeof (record.data) == "undefined")
 {
  return;
 }
 var message = Ext.String.format('Level={0}<br/>state={1}', record.data.Level, record.data.state);
 Ext.Msg.alert("节点信息", message);
}

下面是后台C#代码

定义一个TreeNode类,包含TreePanel节点固有的一些属性,也可以任意扩充,利用这个可以自定义许多附加数据,如我在里面定义Level表示节点的级别。

[Authorize]
[RoutePrefix("api/BasicData_API")]
public class BasicData_APIController : ApiController
{
 [Route("GetBasicTablesTreeSource")]
 public HttpResponseMessage GetBasicTablesTreeSource(string condition = null)
 {
  List<TreeNode> lstF = new List<TreeNode>();
  ZydAdonet z = ZydAdonet.Instance();
  string s1 = "select TableName,title from BaseDataTables order by TableName";
  string sqltext = s1;
  DataTable dt1;
  string ErrMes;
  z.Sql2DTReadOnly(s1, out dt1, null, out ErrMes);
  TreeNode tnd;
  foreach (DataRow drx in dt1.Rows)
  {
   tnd = new TreeNode
   {
    id = drx["TableName"].ToString(),
    text = drx["title"].ToString(),
    Level = 1,
    iconCls = "table_6",
    state = drx["TableName"].ToString() + " OK",
    leaf = true
   };
   lstF.Add(tnd);
  }
  TreeNode root = new TreeNode
  {
   text = "基础数据字典",
   expanded = false,
   iconCls = "folder_close",
   Level = 0,
   state = "RootOfTree",
   leaf = true
  };
  if (lstF.Count > 0)
  {
   root.expanded = true;
   root.leaf = false;
   root.iconCls = "folder_open";
   root.children = lstF;
  }
 
  string JsonStr;
  JsonStr = JsonConvert.SerializeObject(root);
  HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, "value");
  response.Content = new StringContent(JsonStr, Encoding.GetEncoding("UTF-8"), "application/json");
  response.Headers.CacheControl = new CacheControlHeaderValue()
  {
   MaxAge = TimeSpan.FromMinutes(10)
  };
  return response;
 }
}
 
internal class TreeNode
{
 public string id { get; set; }
 public string text { get; set; }
 public string iconCls { get; set; }
 public string state { get; set; }
 public bool leaf { get; set; }
 public int Level { get; set; }
 public bool expanded { get; set; }
 public List<TreeNode> children { get; set; }
}
在NodeClick函数中断可以监视到更多的信息:

最后的运行效果:

然后更改数据表里的数据,点“刷新”就实现了TreePanel节点的刷新。

上面就是这篇文章的全部内容,希望对大家的学习和工作有所帮助,同时同时也希望大家多多支持笔记部落。