如何解决数据表版本1.10.21停留在ASP.NET Core 3.1中的“处理中”
我在Datatable 1.10.21
中使用ASP.NET Core 3.1
,但遇到了 '正在处理...' 的问题。如果发生异常,我会捕捉到异常,但是到目前为止,我还没有看到任何异常。由于我未知的原因,未显示数据库记录。
请您抽出一点时间仔细看看我的代码,以确定我在哪里弄错了并指出。感谢您为解决此问题付出的时间和精力。
这是我的代码:
我的HTML表格:
@model IEnumerable<Users>
<div class="table-responsive">
<table class="table table-bordered table-hover" id="myTable">
<thead>
<tr>
<th>@Html.DisplayNameFor(model => model.Id)</th>
<th>@Html.DisplayNameFor(model => model.FirstName)</th>
<th>@Html.DisplayNameFor(model => model.LastName)</th>
<th>@Html.DisplayNameFor(model => model.Country)</th>
<th>@Html.DisplayNameFor(model => model.Gender)</th>
<th>@Html.DisplayNameFor(model => model.Age)</th>
</tr>
</thead>
<tfoot>
<tr>
<th>@Html.DisplayNameFor(model => model.Id)</th>
<th>@Html.DisplayNameFor(model => model.FirstName)</th>
<th>@Html.DisplayNameFor(model => model.LastName)</th>
<th>@Html.DisplayNameFor(model => model.Country)</th>
<th>@Html.DisplayNameFor(model => model.Gender)</th>
<th>@Html.DisplayNameFor(model => model.Age)</th>
</tr>
</tfoot>
</table>
</div>
模型类别:
public class Users
{
public string Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Country { get; set; }
public string Gender { get; set; }
public string Age { get; set; }
}
数据表初始化程序:
$(document).ready(function () {
$('#myTable').DataTable(
{
// ServerSide Setups
processing: true,serverSide: true,// Paging Setups
paging: true,// Searching Setups
searching: { regex: true },// Ajax Filter
ajax: {
url: "/Home/Data",type: "GET",contentType: "application/json",dataType: "json",data: function (d) {
return JSON.stringify(d);
}
},// columns setups
columns: [
{ data: "id" },{ data: "firstname" },{ data: "lastname" },{ data: "country" },{ data: "gender" },{ data: "age" }
]
});
});
以JSON格式获取数据:
[HttpGet]
public async Task<IActionResult> Data(DataTablesResult tableParams)
{
try
{
var query = context.AspNetUsers.AsQueryable();
var totalCount = await query.CountAsync();
if (tableParams.Search != null)
query = query.Where(c => c.FirstName.Contains(tableParams.Search.Value)
|| c.LastName.Contains(tableParams.Search.Value));
//Other search queries goes here
if (tableParams.Order.Count > 0)
{
if (tableParams.Order[0].Dir == "asc")
query = query.OrderBy(c => EF.Property<string>(c,tableParams.Columns[tableParams.Order[0].Column].Name));
else
query = query.OrderByDescending(c => EF.Property<string>(c,tableParams.Columns[tableParams.Order[0].Column].Name));
}
//In this example multi order is disabled so we can order by any column dynamically
var result = await query.AsNoTracking().Select(E => new { Count = query.Count(),E = E }).Skip(tableParams.Start).Take(tableParams.Length).ToListAsync();
var pureData = result.Select(E => E.E);
if (result.Count == 0)
return Ok(new { tableParams.Draw,recordsTotal = 0,recordsFiltered = 0,data = Enumerable.Empty<string>() });
return Ok(new { tableParams.Draw,recordsTotal = totalCount,recordsFiltered = result.Select(c => c.Count).FirstOrDefault(),data = pureData });
}
catch (Exception ex)
{
ex.Message.ToString();
throw;
}
}
数据表ModelBinder类:
public class DataTableModelBinder : IModelBinder
{
public Task BindModelAsync(ModelBindingContext bindingContext)
{
var request = bindingContext.HttpContext.Request;
// Retrieve request data
var draw = Convert.ToInt32(request.Query["draw"]);
var start = Convert.ToInt32(request.Query["start"]);
var length = Convert.ToInt32(request.Query["length"]);
// Search
var search = new Search
{
Value = request.Query["search[value]"],Regex = Convert.ToBoolean(request.Query["search[regex]"])
};
// Order
var o = 0;
var order = new List<ColumnOrder>();
while (!StringValues.IsNullOrEmpty(request.Query["order[" + o + "][column]"]))
{
order.Add(new ColumnOrder
{
Column = Convert.ToInt32(request.Query["order[" + o + "][column]"]),Dir = request.Query["order[" + o + "][dir]"]
});
o++;
}
// Columns
var c = 0;
var columns = new List<Column>();
while (!StringValues.IsNullOrEmpty(request.Query["columns[" + c + "][name]"]))
{
columns.Add(new Column
{
Data = request.Query["columns[" + c + "][data]"],Name = request.Query["columns[" + c + "][name]"],Orderable = Convert.ToBoolean(request.Query["columns[" + c + "][orderable]"]),Searchable = Convert.ToBoolean(request.Query["columns[" + c + "][searchable]"]),Search = new Search
{
Value = request.Query["columns[" + c + "][search][value]"],Regex = Convert.ToBoolean(request.Query["columns[" + c + "][search][regex]"])
}
});
c++;
}
var result = new DataTablesResult
{
Draw = draw,Start = start,Length = length,Search = search,Order = order,Columns = columns
};
bindingContext.Result = ModelBindingResult.Success(result);
return Task.CompletedTask;
}
}
DtParameters
[ModelBinder(BinderType = typeof(DataTableModelBinder))]
public class DataTablesResult
{
public int Draw { get; set; }
public int Start { get; set; }
public int Length { get; set; }
public Search Search { get; set; }
public List<ColumnOrder> Order { get; set; }
public List<Column> Columns { get; set; }
}
public class Search
{
public string Value { get; set; }
public bool Regex { get; set; }
}
public class Column
{
public string Data { get; set; }
public string Name { get; set; }
public bool Searchable { get; set; }
public bool Orderable { get; set; }
public Search Search { get; set; }
}
public class ColumnOrder
{
public int Column { get; set; }
public string Dir { get; set; }
}
如您所见,我在处理方面陷入困境。可能是什么问题?
当我将draw显式分配给1时,我收到一条消息,表明表中没有数据:
网址:“ / Home / Data?start = 0 && length = 10” 不返回任何数据:
解决方法
1。您需要确保Draw
不能为0,当它为0时,您将停留在“处理中...”上。
2。在您的代码中,我找到了
return Ok(new { tableParams.Draw,recordsTotal = totalCount,recordsFiltered = result.Select(c => c.Count).FirstOrDefault(),data = pureData });
和recordsFiltered
类型应为整数。
这是an official link的参数。
3。您认为:
您需要更改
columns: [
{ data: "id" },{ data: "firstname" },{ data: "lastname" },{ data: "country" },{ data: "gender" },{ data: "age" }
]
到
columns: [
{ data: "id" },{ data: "firstName" },{ data: "lastName" },{ data: "age" }
]
否则,名字和姓氏将不会被绑定。
这是一个可以进行假数据测试的工作演示:
控制器:
public async Task<IActionResult> Data(DataTablesResult tableParams)
{
List<Users> users = new List<Users> { new Users { Id = "1",Age = "1",Country = "UK",Gender = "Male",FirstName = "A",LastName = "A" },new Users { Id = "2",Age = "2",FirstName = "B",LastName = "B" },new Users { Id = "3",Age = "3",FirstName = "C",LastName = "C" } };
return Ok(new { Draw = 1,recordsTotal = 10,recordsFiltered = users.Count(),data = users});
}
,
我通过将JsonSerializer
添加到我的Startup.cs
类中解决了该问题。那是我丢失的code
的一行。
我在这里发布了解决方案: Datatables server-side processing in ASP.NET Core 3.1
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