Loading DataTable using ajax

2020-08-04 09:56发布

站内问答 / 后端开发
1715 2 5

Hello i'm using Ajax Methode to fill a DataTable i have tested my Web API and it's working correctly but i keep getting this message No data available in table

jQuery Code :

// DataTables
        var table = $("#table").DataTable({
            ajax: {
                url: "/api/picklist/getpicklist",
                dataSrc:"",
            },
            columns: [
                {
                    data:"numero_picklist"
                },
                {
                    data:"PFIN"
                }
            ]
        });

HTML Table :

<table id="table" class="table table-bordered table-hover table-responsive table-striped">
                    <thead>
                        <tr>
                            <th>Numéro picklist</th>
                        </tr>
                    </thead>
                </table>

web API :

 // GET /api/picklist
            public IEnumerable<PicklistDto> GetPicklist()
            {
                return _context.Dimension_picklist.ToList().Select(Mapper.Map<Dimension_picklist,PicklistDto>);
            }

Web API Test : enter image description here

2条回答
啃猪蹄的小仙女
2楼-- · 2020-08-04 10:34

Here are some things you can do to help you debug. My guess is that your data is not where you thing it is on your json objejct.

 var table = $("#table").DataTable({
        ajax: {
            url: "/api/picklist/getpicklist",
            dataSrc:"",
            // add this
            dataFilter: function(res) {
               // to see what actual data is being sent from the server.
               // you can check to make sure that your data is where you think it is (some servers wrap data in other object, for example, 
                // Microsoft web services puts the data in an object call d.
               console.log(res);
               return res;
            },
            error: function(err, status){
            //  add this section to record any errors
                console.log(err);
            }
        },
        columns: [
            {
                data:"numero_picklist"
            },
            {
                data:"PFIN"
            }
        ]
    });
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姐就是有狂的资本
3楼-- · 2020-08-04 10:52

First you need learn sractch of data table & its parameter. On the ajax its send the some parameter to target method to fetch record and filterning. i've used DTParameters which contail the param.

Here is ActionMethod

  [System.Web.Http.HttpPost]
    public IHttpActionResult loadData(DTParameters param)
    {

        //Us IQuerable for server side processings -filterning and pagination
        //i m just doing testing

        var ListData = getList();

        //take and skip record according to pagination
        var takeData = ListData.Skip(param.Start).Take(param.Length).ToList();

        //  IF searching value is not null
        if (param.Search.Value != null && param.Search.Value != "")
        {
            var sendData = takeData.Where(p => p.numero_picklist != null && p.numero_picklist.ToLower().Contains(param.Search.Value.ToLower())
            || p.PFIN != null && p.PFIN.ToLower().Contains(param.Search.Value.ToLower())).ToList();

            DTResult<PicklistDto> result = new DTResult<PicklistDto>
            {
                draw = param.Draw,
                data = sendData.ToList(),
                recordsFiltered = ListData.Count(), // total number of record
                recordsTotal = ListData.Count(), // total number of record
            };
            return Json(result);

        }
        else
        {
            var sendData = takeData;
            DTResult<PicklistDto> result = new DTResult<PicklistDto>
            {
                draw = param.Draw,
                data = sendData.ToList(),
                recordsFiltered = ListData.Count(), // total number of record
                recordsTotal = ListData.Count(), // total number of record
            };
            return Json(result);

        }



    }

index.chsml datatable script

        <!doctype html>
<html>
<head>
    <title>@ViewBag.Title - MVC Datatables App</title>
</head>

<body>
    <div class="container">
        <h3> Report</h3>

            <table class="table table-striped" id="datatab">
                <thead>
                    <tr>
                        <th>
                            numero_picklist
                        </th>
                        <th>
                            PFIN
                        </th>

                    </tr>
                </thead>
                <tbody>


                </tbody>
            </table>
    </div>
</body>

</html>
<link href="~/Content/bootstrap.min.css" rel="stylesheet" />
<link href="~/Content/dataTables.scroller.min.css" rel="stylesheet" />
<script src="~/Scripts/jquery-1.11.3.min.js"></script>
<script src="~/Scripts/jquery.dataTables.min.js"></script>
<script>

    //initiate dataTables plugin

   $('#datatab')
   //.wrap("<div class='dataTables_borderWrap' />")   //if you are applying horizontal scrolling (sScrollX)
   .DataTable({

       "bProcessing": true,
       "bServerSide": true,
       //"serverSide": true,
       "ajax": {
           "type": "POST",
           "url":'/DataTable/loadData',
           "contentType":'application/json; charset=utf-8',
           'data': function (data) {
               //console.log(data);
               return data = JSON.stringify(data);
           },
           //dataSrc: '',
       },

       "paging": true,
       //"deferRender": true,
       "columns": [
          { "data": "numero_picklist" },
          { "data": "PFIN" },

       ],
       "order": [0, "asc"],
       bAutoWidth: false,

   });
</script>

Create the modal class 'DatatablesViewModel' save it , import to your controller.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

///This view model class has been referred from example created by Marien Monnier at Soft.it. All credits to Marien for this class
namespace MVCDatatableApp.Models
{
    /// <summary>
    /// A full result, as understood by jQuery DataTables.
    /// </summary>
    /// <typeparam name="T">The data type of each row.</typeparam>
    public class DTResult<T>
    {
        /// <summary>
        /// The draw counter that this object is a response to - from the draw parameter sent as part of the data request.
        /// Note that it is strongly recommended for security reasons that you cast this parameter to an integer, rather than simply echoing back to the client what it sent in the draw parameter, in order to prevent Cross Site Scripting (XSS) attacks.
        /// </summary>
        public int draw { get; set; }

        /// <summary>
        /// Total records, before filtering (i.e. the total number of records in the database)
        /// </summary>
        public int recordsTotal { get; set; }

        /// <summary>
        /// Total records, after filtering (i.e. the total number of records after filtering has been applied - not just the number of records being returned for this page of data).
        /// </summary>
        public int recordsFiltered { get; set; }

        /// <summary>
        /// The data to be displayed in the table.
        /// This is an array of data source objects, one for each row, which will be used by DataTables.
        /// Note that this parameter's name can be changed using the ajaxDT option's dataSrc property.
        /// </summary>
        public List<T> data { get; set; }
    }

    /// <summary>
    /// The additional columns that you can send to jQuery DataTables for automatic processing.
    /// </summary>
    public abstract class DTRow
    {
        /// <summary>
        /// Set the ID property of the dt-tag tr node to this value
        /// </summary>
        public virtual string DT_RowId
        {
            get { return null; }
        }

        /// <summary>
        /// Add this class to the dt-tag tr node
        /// </summary>
        public virtual string DT_RowClass
        {
            get { return null; }
        }

        /// <summary>
        /// Add this data property to the row's dt-tag tr node allowing abstract data to be added to the node, using the HTML5 data-* attributes.
        /// This uses the jQuery data() method to set the data, which can also then be used for later retrieval (for example on a click event).
        /// </summary>
        public virtual object DT_RowData
        {
            get { return null; }
        }
    }

    /// <summary>
    /// The parameters sent by jQuery DataTables in AJAX queries.
    /// </summary>
    public class DTParameters
    {
        /// <summary>
        /// Draw counter.
        /// This is used by DataTables to ensure that the Ajax returns from server-side processing requests are drawn in sequence by DataTables (Ajax requests are asynchronous and thus can return out of sequence).
        /// This is used as part of the draw return parameter (see below).
        /// </summary>
        public int Draw { get; set; }

        /// <summary>
        /// An array defining all columns in the table.
        /// </summary>
        public DTColumn[] Columns { get; set; }

        /// <summary>
        /// An array defining how many columns are being ordering upon - i.e. if the array length is 1, then a single column sort is being performed, otherwise a multi-column sort is being performed.
        /// </summary>
        public DTOrder[] Order { get; set; }

        /// <summary>
        /// Paging first record indicator.
        /// This is the start point in the current data set (0 index based - i.e. 0 is the first record).
        /// </summary>
        public int Start { get; set; }

        /// <summary>
        /// Number of records that the table can display in the current draw.
        /// It is expected that the number of records returned will be equal to this number, unless the server has fewer records to return.
        /// Note that this can be -1 to indicate that all records should be returned (although that negates any benefits of server-side processing!)
        /// </summary>
        public int Length { get; set; }

        /// <summary>
        /// Global search value. To be applied to all columns which have searchable as true.
        /// </summary>
        public DTSearch Search { get; set; }

        /// <summary>
        /// Custom column that is used to further sort on the first Order column.
        /// </summary>
        public string SortOrder
        {
            get
            {
                return Columns != null && Order != null && Order.Length > 0
                    ? (Columns[Order[0].Column].Data + (Order[0].Dir == DTOrderDir.DESC ? " " + Order[0].Dir : string.Empty))
                    : null;
            }
        }

    }

    /// <summary>
    /// A jQuery DataTables column.
    /// </summary>
    public class DTColumn
    {
        /// <summary>
        /// Column's data source, as defined by columns.data.
        /// </summary>
        public string Data { get; set; }

        /// <summary>
        /// Column's name, as defined by columns.name.
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// Flag to indicate if this column is searchable (true) or not (false). This is controlled by columns.searchable.
        /// </summary>
        public bool Searchable { get; set; }

        /// <summary>
        /// Flag to indicate if this column is orderable (true) or not (false). This is controlled by columns.orderable.
        /// </summary>
        public bool Orderable { get; set; }

        /// <summary>
        /// Specific search value.
        /// </summary>
        public DTSearch Search { get; set; }
    }

    /// <summary>
    /// An order, as sent by jQuery DataTables when doing AJAX queries.
    /// </summary>
    public class DTOrder
    {
        /// <summary>
        /// Column to which ordering should be applied.
        /// This is an index reference to the columns array of information that is also submitted to the server.
        /// </summary>
        public int Column { get; set; }

        /// <summary>
        /// Ordering direction for this column.
        /// It will be dt-string asc or dt-string desc to indicate ascending ordering or descending ordering, respectively.
        /// </summary>
        public DTOrderDir Dir { get; set; }
    }

    /// <summary>
    /// Sort orders of jQuery DataTables.
    /// </summary>
    public enum DTOrderDir
    {
        ASC,
        DESC
    }

    /// <summary>
    /// A search, as sent by jQuery DataTables when doing AJAX queries.
    /// </summary>
    public class DTSearch
    {
        /// <summary>
        /// Global search value. To be applied to all columns which have searchable as true.
        /// </summary>
        public string Value { get; set; }

        /// <summary>
        /// true if the global filter should be treated as a regular expression for advanced searching, false otherwise.
        /// Note that normally server-side processing scripts will not perform regular expression searching for performance reasons on large data sets, but it is technically possible and at the discretion of your script.
        /// </summary>
        public bool Regex { get; set; }
    }
}

For more detail you can visit this site visit this

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