根据实时数据在同一个DataGrid中显示不同字段,本身easyui并没有支持动态绑定列名,只有show属性显示或隐藏某字段。今天在网上看到直接修改easyui类库动态绑定列名的方法，废话不多说直接借用源码备份以后用。先说一下思路：首先UI的datagrid中没有指定任何列，ajax提交成功后同时返回列的信息，先进行列的动态绑定，然后显示数据内容。
1.UI
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>动态datagrid</title>
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script src="Scripts/jquery.easyui.min.js" type="text/javascript"></script>
<link href="Style/themes/default/easyui.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
$(function () {
$('#tbUsers').datagrid({
title: 'My Title',
600,
height: 350,
dataType: 'json',
url: 'GetAjaxData.ashx?action=GetUserList2',
columns: [[]],
pagination: true,
pageSize: 5, //每页记录数
pageList: [5, 10, 15, 20, 30, 50], //分页记录数数组
onLoadSuccess: function (data, param) {
}
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table id="tbUsers">
</table>
</div>
</form>
</body>
</html>
2.easyUI类库的修改（位置在datagrid ajax提交位置L6220处）
$.ajax({ type: opts.method, url: opts.url, data: _43d, dataType: "json", success: function (data) {
//动态添加列
if (!!data && !!data.columns) {
var opts=$.data(_43a, "datagrid").options;
var _369 = $.data(_43a, "datagrid").panel;
var cols = $.data(_43a, "datagrid").options.columns[0];
var colCount=cols.length;
if(colCount==0){
//cols.slice(0,cols.length);//清除数组内容
for (var i = 0; i < data.columns.length; i++) {
var col = {
field: data.columns[i].field,
title: data.columns[i].title,
data.columns[i].width,
align: data.columns[i].align
};
cols.push(col);
}
//UI添加列
if (colCount==0 && opts.columns) {
var t = _370(opts.columns);
$("div.datagrid-view2 div.datagrid-header-inner", _369).html(t);
}
}
}
setTimeout(function () {
_440();
}, 0);
if(!!data && !!data.rows){
_3a2(_43a, data);
}
setTimeout(function () {
_42d(_43a);
}, 0);
}, error: function () {
setTimeout(function () {
_440();
}, 0);
if (opts.onLoadError) {
opts.onLoadError.apply(_43a, arguments);
}
}
});
};
3.后台提供数据（一般处理程序）
'total':20,
'rows':[
{'name':'zhangsan01','age':'21','hobby':'001'},
{'name':'zhangsan02','age':'21','hobby':'001'},
{'name':'zhangsan03','age':'21','hobby':'001'},
{'name':'zhangsan04','age':'21','hobby':'001'},
{'name':'zhangsan05','age':'21','hobby':'001'}
],
'columns':[
{'field':'name','title':'Name','width':100,'align':'center'},
{'field':'age','title':'Age','width':100,'align':'center'},
{'field':'hobby','title':'Hobby','width':100,'align':'center'}
]
}";
strJson = strJson.Replace("'", "/"");
HttpResponse response = context.Response;
response.ContentType = "text/json";
response.Write(strJson);
}
这样就完成了动态绑定列名。功能是可以了，还不利于大量生产，需要提供自动集合转Json的类。
为此，我设计了一个JDataGrid类用于将List的集合生成我的DataGrid需要的数据格式（包含列的信息）。
1.定义User类，就作为实体类
public string Name { get; set; }
public int Age { get; set; }
public string Gender { get; set; }
public string Hobby { get; set; }
}
}
2.定义JDataGrid类和JColumn类
public int total { get; set; }
public List<Dictionary<string, object>> rows { get; set; }
public List<JColumn> columns { get; set; }
public static List<Dictionary<string, object>> ConvertRows(IList list) {
List<Dictionary<string, object>> rowsList=new List<Dictionary<string, object>>();
if (list != null) {
foreach (object obj in list) {
Dictionary<string, object> dic = new Dictionary<string, object>();
Type t = obj.GetType();
foreach (PropertyInfo pi in t.GetProperties()) {
string key = pi.Name;
object value=pi.GetValue(obj, null);
dic.Add(key, value);
}
rowsList.Add(dic);
}
}
return rowsList;
}
public string ConvertToJson() {
StringBuilder sb = new StringBuilder();
sb.AppendFormat("{{/"total/":{0},/"rows/":[", total);
//添加数据
if (rows != null && rows.Count > 0) {
for (int i = 0; i < rows.Count; i++) {
sb.Append("{");
foreach (string key in rows[i].Keys) {
if (rows[i][key] is ValueType) {
sb.AppendFormat("/"{0}/":{1},", key, rows[i][key]);
} else {
sb.AppendFormat("/"{0}/":/"{1}/",", key, rows[i][key]);
}
}
sb.Remove(sb.Length - 1, 1);
sb.Append("}");
if (i != rows.Count - 1) {
sb.Append(",");
}
}
}
sb.Append("],");
sb.Append("/"columns/":[");
//添加列
if (columns != null && columns.Count > 0) {
for (int i = 0; i < columns.Count; i++) {
sb.Append(columns[i].ConvertToJson());
if (i != columns.Count - 1) {
sb.Append(",");
}
}
}
sb.Append("]}");
string str=sb.ToString();
return str;
}
}
public class JColumn {
public int rowspan { get; set; }
public int colspan { get; set; }
public bool checkbox { get; set; }
public string field { get; set; }
public string title { get; set; }
public int width { get; set; }
public string align { get; set; }
public string ConvertToJson() {
StringBuilder sb = new StringBuilder();
sb.Append("{");
if (rowspan != null) {
sb.AppendFormat("/"rowspan/":{0},", rowspan);
}
if (colspan != null) {
sb.AppendFormat("/"colspan/":{0},", colspan);
}
if (checkbox != null) {
sb.AppendFormat("/"checkbox/":{0},", checkbox);
}
sb.AppendFormat("/"field/":/"{0}/",", field);
sb.AppendFormat("/"width/":{0},", width);
sb.AppendFormat("/"align/":/"{0}/",", align);
sb.AppendFormat("/"title/":/"{0}/",", title);
sb.Remove(sb.Length - 1, 1);
sb.Append("}");
String str = sb.ToString();
return str;
}
}
3.后台获取数据（一般处理程序）
for (int i = 0; i < 10; i++) {
userList.Add(new User {
Name = "Name" + (i + 1),
Age = 20 + i,
Gender = i % 3 == 0 ? "男" : "女",
Hobby = i.ToString()
});
}
List<JColumn> colList = new List<JColumn>() {
new JColumn{field="Name",title="姓名",width=100,align="center"},
new JColumn{field="Age",title="年龄",width=100,align="center"},
new JColumn{field="Gender",title="性别",width=50,align="center"},
new JColumn{field="Hobby",title="兴趣",width=150,align="center"},
};
JDataGrid dg = new JDataGrid {
total=20,
rows=JDataGrid.ConvertRows(userList),
columns=colList,
};
string strJson = dg.ConvertToJson();
HttpResponse response = context.Response;
response.ContentType = "text/json";
response.Write(strJson);
}
对比前面的方法，显示代码通用多了
