jQuery Bootgrid sorting, pagination and search functionality not working - asp.net

Question

I have a jQuery bootgrid implemented into my ASP.Net application which is filled using a Generic Handler.
I fill the bootgrid using the Generic Handler as follows:
$(function () {
var grid = $("#grid").bootgrid({
ajax: true,
ajaxSettings: {
method: "GET",
contentType: "application/json; charset=utf-8",
dataType: "json",
cache: false
},
url: "/MyHandler.ashx",
rowCount: [10, 50, 75, 100, 200, -1]
});
}
Here's MyHandler.ashx code:
public class RolesHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/json";
context.Response.Write(GetData());
}
public bool IsReusable
{
get
{
return false;
}
}
public string GetData()
{
var result = string.Empty;
var con = new SqlConnection();
var cmd = new SqlCommand();
var dt = new DataTable();
string sSQL = #"SELECT Id, Name
FROM dbo.AspNetRoles;";
try
{
using (var connection = THF.Models.SQLConnectionManager.GetConnection())
{
using (var command = new SqlCommand(sSQL, connection))
{
connection.Open();
command.CommandTimeout = 0;
var da = new SqlDataAdapter(command);
da.Fill(dt);
}
}
var sNumRows = dt.Rows.Count.ToString();
var sDT = JsonConvert.SerializeObject(dt);
result = "{ \"current\": 1, \"rowCount\": 10, \"rows\": " + sDT + ", \"total\": " + sNumRows + " }";
}
catch (Exception ex)
{
}
finally
{
cmd.Dispose();
THF.Models.SQLConnectionManager.CloseConn(con);
}
return result;
}
}
Basically all the important functionality of my bootgrid that worked before I implemented it the ajax way doesn't work anymore. Specifically the ordering, searching and pagination functionality aren't working at all without any errors.
As far as I know from a bit of research. This is because every time a search phrase is made, or a header is clicked (for ordering) etc. The bootgrid performs an ajax call.
Any idea on how to fix the functionality here?

Answer 1

After much work I ended up getting it working and this is the final code result:
public class RolesHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/json";
var current = context.Request.Params["current"];
var rowCount = context.Request.Params["rowCount"];
var orderById = context.Request.Params["sort[Id]"];
var orderByName = context.Request.Params["sort[Name]"];
var searchPhrase = context.Request.Params["searchPhrase"];
var orderBy = "Id";
var orderFrom = "ASC";
if (orderById != null)
{
orderBy = "Id";
orderFrom = orderById;
}
else if (orderByName != null)
{
orderBy = "Name";
orderFrom = orderByName;
}
context.Response.Write(GetData(current, rowCount, orderBy, orderFrom, searchPhrase));
}
public bool IsReusable
{
get
{
return false;
}
}
public string GetData(string current, string rowCount, string orderBy, string orderFrom, string searchPhrase)
{
var result = string.Empty;
var currentNum = Convert.ToInt32(current) - 1;
var temp = 0;
if (!"Id".Equals(orderBy, StringComparison.OrdinalIgnoreCase)
&& !"Name".Equals(orderBy, StringComparison.OrdinalIgnoreCase))
throw new ArgumentException("orderBy is not a valid value");
if (!"desc".Equals(orderFrom, StringComparison.OrdinalIgnoreCase) && !"asc".Equals(orderFrom, StringComparison.OrdinalIgnoreCase))
throw new ArgumentException("orderFrom is not a valid value");
if (!int.TryParse(rowCount, out temp))
throw new ArgumentException("Rowcount is not a valid number");
var dt = new DataTable();
string sSQL = #"SELECT Id, Name
FROM dbo.AspNetRoles
WHERE Id LIKE #searchPhrase
OR Name LIKE #searchPhrase
ORDER BY " + orderBy + " " + orderFrom + #"
OFFSET ((" + currentNum.ToString() + ") * " + rowCount + #") ROWS
FETCH NEXT " + rowCount + " ROWS ONLY;";
using (var connection = THF.Models.SQLConnectionManager.GetConnection())
{
using (var command = new SqlCommand(sSQL, connection))
{
command.Parameters.Add(new SqlParameter("#searchPhrase", "%" + searchPhrase + "%"));
command.Parameters.Add(new SqlParameter("#orderBy", orderBy));
connection.Open();
command.CommandTimeout = 0;
var da = new SqlDataAdapter(command);
da.Fill(dt);
connection.Close();
}
}
var total = string.Empty;
string sSQLTotal = #"SELECT COUNT(*)
FROM dbo.Log
WHERE Id LIKE #searchPhrase
OR Name LIKE #searchPhrase;";
using (var connection = THF.Models.SQLConnectionManager.GetConnection())
{
using (var command = new SqlCommand(sSQLTotal, connection))
{
command.Parameters.Add(new SqlParameter("searchPhrase", "%" + searchPhrase + "%"));
connection.Open();
command.CommandTimeout = 0;
total = command.ExecuteScalar().ToString();
connection.Close();
}
}
var rows = JsonConvert.SerializeObject(dt);
return result = "{ \"current\": " + current + ", \"rowCount\": " + rowCount + ", \"rows\": " + rows + ", \"total\": " + total + " }";
}
}