如何将当前页码和长度发送到服务器

Question

我按照 DataTable 文档执行如下，数据被重新渲染但分页无法正常工作。

当我点击dataTable和actula右下角的页码pageSize时，如何获得实际的pageNumber(table.page.info().page) (table.page.info().length) 当我在 ajax 调用之前更改数据表左上角的页面长度时。

示例 1：当我点击页码“1”时，我得到 -

Page Number 0 Page Size 10 

但应该是的

Page Number 1 Page Size 10 

示例 2：当我将页面长度“10”更改为“25”时，我得到 -

Page Number 0 Page Size 10

但应该是的

Page Number 0 Page Size 25 

也就是说我落后了一步，请帮助....

这是我的 html

<table id="allScholarshipResult" class="table table-striped table-bordered" style="width:100%">
        <thead>
        <tr>
            <th>Id</th>
            <th>Scholarship Year</th>
            <th>Scholarship Level</th>
            <th>Total Candidate</th>
            <th>Boy</th>
            <th>Girl</th>
        </tr>
        </thead>

        <tfoot>
        <tr>
            <th>Id</th>
            <th>Scholarship Year</th>
            <th>Scholarship Level</th>
            <th>Total Candidate</th>
            <th>Boy</th>
            <th>Girl</th>
        </tr>
        </tfoot>
    </table>

这里是js

    $(document).ready(function() {
       var url = 'all';
   var pageNumber;
   var pageSize;
   var table =  $('#allScholarshipResult').DataTable({
          "processing": true,
          "serverSide": true,
          "paging": true,
          "searching": { "regex": true },
          ajax: function ( data, callback, settings ) {

               $.ajax({
                    url: url,
                    type: 'GET',
                    data: {
                         pageNumber: pageNumber,
                         pageSize: pageSize
                    },
                    success: function( response, textStatus, jQxhr ){
                         pageNumber = table.page.info().page;
                         pageSize= table.page.info().length;
                         console.log('Page Number '+pageNumber + ' Page Size ' + pageSize);
                         callback({
                              data: response.responseObject.data,
                              recordsTotal:  response.responseObject.recordsTotal,
                              recordsFiltered:  response.responseObject.recordsFiltered
                         });
                    },
                    error: function( jqXhr, textStatus, errorThrown ){
                    }
               });
          },
          columns: [
               { data: "id" },
               { data: "examYear" },
               { data: "scholarshipLevelId" },
               { data: "candidateTotal" },
               { data: "candidateBoy" },
               { data: "candidateGirl" },
            ]

     });
    } );

从 API 返回的响应

{
  "recordsTotal": 5,
  "recordsFiltered": 5,
  "data": [
    {
      "id": 76,
      "examYear": 2020,
      "scholarshipLevelId": 1,
      "candidateTotal": 0,
      "candidateBoy": 0,
      "candidateGirl": 0
    },
    {
      "id": 75,
      "examYear": 2020,
      "scholarshipLevelId": 1,
      "candidateTotal": 0,
      "candidateBoy": 0,
      "candidateGirl": 0
    },
    {
      "id": 74,
      "examYear": 2019,
      "scholarshipLevelId": 2,
      "candidateTotal": 0,
      "candidateBoy": 0,
      "candidateGirl": 0
    },
    {
      "id": 73,
      "examYear": 2019,
      "scholarshipLevelId": 1,
      "candidateTotal": 0,
      "candidateBoy": 0,
      "candidateGirl": 0
    },
    {
      "id": 72,
      "examYear": 2020,
      "scholarshipLevelId": 2,
      "candidateTotal": 0,
      "candidateBoy": 0,
      "candidateGirl": 0
    }
  ]
}

Answer 1

第一次，您将在服务器中获得的pageNumber 和pageSize 的值将是undefined。从服务器获得响应后，您将 pageNumber 和 pageSize 的值设置为表的页码和当前时间点的页长将是 0 和10。

现在，每当您点击任何页面，比如说 5，您将在服务器中获得 0 而不是 4 .

我建议您使用在 ajax 函数中传递的 settings 对象：

$(document).ready(function() {
    var url = 'all';
    var table = $('#allScholarshipResult').DataTable({
      "processing": true,
      "serverSide": true,
      "paging": true,
      "searching": { "regex": true },
      ajax: function (data, callback, settings) {
            var api = new $.fn.dataTable.Api(settings); // <--- create new api object using settings object
            $.ajax({
                url: url,
                type: 'GET',
                data: {
                      pageNumber: api.page(), // <---- get page number
                      pageSize: api.page.len(), //<--- get page length
                },
            });
      },
  });
});