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Jquery easyui从零单排之datagrid查询

2015-12-11 09:27 746 查看

这里开始学习datagrid查询功能的实现。

一、前台代码：

<head>
<meta charset="UTF-8">
<title>Start from zero</title>
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.1/themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.1/themes/icon.css">
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.1/demo/demo.css">
<script type="text/javascript" src="jquery-easyui-1.4.1/jquery.min.js"></script>
<script type="text/javascript" src="jquery-easyui-1.4.1/jquery.easyui.min.js"></script>
</head>
<body>
<form id="fm">
<table id="dg" title="Client Side Pagination" toolbar="#tb" fitcolumns="true" rownumbers="true"
showfooter="true" style="width: 640px; height: 600px" data-options="
remoteSort:false,
rownumbers:true,
singleSelect:false,
autoRowHeight:true,
pagination:true,
showFooter: true,
fitColumns: true,
pageSize:20">
<thead frozen="true">
<tr>
<th data-options="field:'ck',checkbox:true,width:40">
</th>
<th data-options="field:'LoginID',width:100" sortable="true">
LoginID
</th>
</tr>
</thead>
<thead>
<tr>
<th data-options="field:'UserName',width:120" sortable="true">
UserName
</th>
<th data-options="field:'Sex',align:'center',width:80" sortable="true">
Sex
</th>
<th data-options="field:'Department',width:140" sortable="true">
Department
</th>
<th data-options="field:'Age',width:80" sortable="true">
Age
</th>
<th data-options="field:'_operate',width:40,align:'center'">
操作
</th>
<th data-options="field:'_operate1',width:40,align:'center'">
删除
</th>
</tr>
</thead>
</table>
<div id="tb" style="padding: 3px">
<span>UserName:</span>
<input id="username" style="line-height: 26px; border: 1px solid #ccc">
<span>LoginID:</span>
<input id="loginid" style="line-height: 26px; border: 1px solid #ccc">
<a href="#" class="easyui-linkbutton" plain="true" onclick="doSearch()">Search</a>
</div>
<script type="text/javascript">
function getData()
{
$('#dg').datagrid({
url: 'Handler.ashx',
method: 'get',
striped: true,
title: "员工列表",
onSortColumn: function (sort, order)
{
//alert("sort:" + sort + ",order：" + order + "");
$('#dg').datagrid('reload', {
sort: sort,
order: order
});
}
})
}

function pagerFilter(data)
{
if (typeof data.length == 'number' && typeof data.splice == 'function') {	// is array
data = {
total: data.length,
rows: data
}
}
var dg = $(this);
var opts = dg.datagrid('options');
var pager = dg.datagrid('getPager');
pager.pagination({
onSelectPage: function (pageNum, pageSize)
{
opts.pageNumber = pageNum;
opts.pageSize = pageSize;
pager.pagination('refresh', {
pageNumber: pageNum,
pageSize: pageSize
});
dg.datagrid('loadData', data);
}
});
if (!data.originalRows) {
data.originalRows = (data.rows);
}
var start = (opts.pageNumber - 1) * parseInt(opts.pageSize);
var end = start + parseInt(opts.pageSize);
data.rows = (data.originalRows.slice(start, end));
return data;
}
function doSearch()
{
$("#test").val("search");
$('#dg').datagrid('reload', {
test: $('#test').val(),
username: $('#username').val(),
loginid: $('#loginid').val()
});
}
$(function ()
{
$('#dg').datagrid({ loadFilter: pagerFilter }).datagrid('loadData', getData());
});
</script>
<div id="dlg">
</div>
<input name="Test" id="test" type="hidden" />
<input id="btn_select" type="button" value="SelectData" onclick="SelectData()" />
</form>
</body>
</html>

查询的关键代码在这里：

function doSearch()
{
$("#test").val("search");
$('#dg').datagrid('reload', {
test: $('#test').val(),
username: $('#username').val(),
loginid: $('#loginid').val()
});
}

这里向处理页面传值，test是一个标识（表示该操作是查询，还是其他操作，比如删除，编辑等），，username是username文本框中的值，loginid是loginid文本框中的值，后两个值供查询函数使用。

$('#dg').datagrid('reload'的作用是获取查询后的数据后，重新加载。

二、处理代码：

<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using Newtonsoft.Json;
using System.Text;

public class Handler : IHttpHandler {

public void ProcessRequest(HttpContext context)
{
string test = context.Request.QueryString["test"];//前台传的标示值
string username = context.Request.QueryString["username"];//前台传的查询值
string loginid = context.Request.QueryString["loginid"];//前台传的查询值

string sort = !string.IsNullOrEmpty(context.Request.QueryString["sort"])?context.Request.QueryString["sort"]:"LoginID";
string order = !string.IsNullOrEmpty(context.Request.QueryString["order"])?context.Request.QueryString["order"]:"asc";
if (string.IsNullOrEmpty(test))
{
Query(context,sort,order);
}
else if (test == "search")
{
SearchData(context, username, loginid);
}
}
public void Query(HttpContext context,string sort,string order)
{
context.Response.ContentType = "text/plain";
SqlHelp sqla = new SqlHelp();
string stra = "select * from tTestTable order by "+sort+" "+order;

DataTable dta = sqla.GetDataTable(stra);
sqla.SqlClose();

string json = JsonConvert.SerializeObject(dta);

context.Response.Write(json);

}
public void SearchData(HttpContext context, string username, string loginid)
{
context.Response.ContentType = "text/plain";

SqlHelp sqlb = new SqlHelp();
string strb = "select * from tTestTable where 1=1";
if (!string.IsNullOrEmpty(username))
{
strb += " and " + "UserName" + " like '%" + username + "%'";
}
if (!string.IsNullOrEmpty(loginid))
{
strb += " and " + "LoginID" + " like '%" + loginid + "%'";
}
strb += " order by LoginID desc";
DataTable dtb = sqlb.GetDataTable(strb);
sqlb.SqlClose();

string jsonb = JsonConvert.SerializeObject(dtb);

context.Response.Write(jsonb);

}
public bool IsReusable
{
get
{
return false;
}
}

}

程序在这里先判断string test = context.Request.QueryString["test"]这个，若是查询的话，test在这里肯定等于search，那就执行SearchData(context, username, loginid)这个查询函数，然后返回Json数据。

三、运行结果截图：

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