javascript - 如何使用我自己的自定义下拉菜单控制 DataTables 生成的选择菜单？

Question

我有一个自动生成的选择菜单，其中有四个选项，如下所示:

    <div class="dataTables_length" id="table_length">
   <label>
      Show 
      <select name="table_length" aria-controls="table">
         <option value="10">10 results</option>
         <option value="15">15 results</option>
         <option value="25">25 results</option>
         <option value="-1">All results</option>
      </select>
      entries
   </label>
</div>

我还有一个包含在 DataTables 区域外部的 div 元素，它具有我无法应用于 select 元素的所有样式，因为它是一个 select 元素:

<div id="dropdown-container">
    <div id="dropdown">
        <button id="dropdown-button"></button>
        <div id="10-results" class="dropdown-item">
          <p>
            10 results
          </p>
       </div>
       <div id="15-results">
          <p>15 results</p>
       </div>
       <div id="25-results" class="dropdown-item">
         <p>25 results</p>
       </div>
       <div id="all-results" class="dropdown-item">
         <p>All results</p>
       </div>
    </div>
</div>

根据我的研究，我应该能够使用以下 jQuery 逻辑在单击时更改选择值:

$("#10-results").on("click", function(){
    $('select').val( 10 );
});

但这似乎不起作用!

这是页面上唯一的选择元素，即使在向其中注入(inject)唯一的类之后，也看不到预期的结果 - 每个选项在单击其他元素时被激活，就像该选项本身被单击一样。

不确定这是否是 DataTables 特定的问题，但在没有可用替代选项的情况下包含不可样式化的选择元素对我来说没有意义。

Answer 1

page.len(): This method is used quite simply to get and set the length of the paging used by DataTables for display.

因此，请更改您的点击事件处理程序:

$("#10-results").on("click", function(){
    $('#yourdatatableid').DataTable().page.len(10).draw();
});

$("#10-results").on("click", function(){
    $('#yourdatatableid').DataTable().page.len(10).draw();
});

$('#yourdatatableid').DataTable({
    "pageLength": 5,
    "lengthMenu": [ [5, 10, 25, 50, -1], [5, 10, 25, 50, "All"] ]
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="//cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css">
<script src="//cdn.datatables.net/1.10.19/js/jquery.dataTables.min.js"></script>

<div id="dropdown-container">
    <div id="dropdown">
        <button id="dropdown-button"></button>
        <div id="10-results" class="dropdown-item">
            <p>
                10 results
            </p>
        </div>
        <div id="15-results">
            <p>15 results</p>
        </div>
        <div id="25-results" class="dropdown-item">
            <p>25 results</p>
        </div>
        <div id="all-results" class="dropdown-item">
            <p>All results</p>
        </div>
    </div>
</div>
<table id="yourdatatableid" class="display" style="width:100%">
    <thead>
    <tr>
        <th>Name</th>
        <th>Position</th>
        <th>Office</th>
        <th>Age</th>
        <th>Start date</th>
        <th>Salary</th>
    </tr>
    </thead>
    <tbody>
    <tr>
        <td>Tiger Nixon</td>
        <td>System Architect</td>
        <td>Edinburgh</td>
        <td>61</td>
        <td>2011/04/25</td>
        <td>$320,800</td>
    </tr>
    <tr>
        <td>Garrett Winters</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>63</td>
        <td>2011/07/25</td>
        <td>$170,750</td>
    </tr>
    <tr>
        <td>Ashton Cox</td>
        <td>Junior Technical Author</td>
        <td>San Francisco</td>
        <td>66</td>
        <td>2009/01/12</td>
        <td>$86,000</td>
    </tr>
    <tr>
        <td>Cedric Kelly</td>
        <td>Senior Javascript Developer</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2012/03/29</td>
        <td>$433,060</td>
    </tr>
    <tr>
        <td>Airi Satou</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>33</td>
        <td>2008/11/28</td>
        <td>$162,700</td>
    </tr>
    <tr>
        <td>Brielle Williamson</td>
        <td>Integration Specialist</td>
        <td>New York</td>
        <td>61</td>
        <td>2012/12/02</td>
        <td>$372,000</td>
    </tr>
    <tr>
        <td>Herrod Chandler</td>
        <td>Sales Assistant</td>
        <td>San Francisco</td>
        <td>59</td>
        <td>2012/08/06</td>
        <td>$137,500</td>
    </tr>
    <tr>
        <td>Rhona Davidson</td>
        <td>Integration Specialist</td>
        <td>Tokyo</td>
        <td>55</td>
        <td>2010/10/14</td>
        <td>$327,900</td>
    </tr>
    <tr>
        <td>Colleen Hurst</td>
        <td>Javascript Developer</td>
        <td>San Francisco</td>
        <td>39</td>
        <td>2009/09/15</td>
        <td>$205,500</td>
    </tr>
    <tr>
        <td>Sonya Frost</td>
        <td>Software Engineer</td>
        <td>Edinburgh</td>
        <td>23</td>
        <td>2008/12/13</td>
        <td>$103,600</td>
    </tr>
    <tr>
        <td>Jena Gaines</td>
        <td>Office Manager</td>
        <td>London</td>
        <td>30</td>
        <td>2008/12/19</td>
        <td>$90,560</td>
    </tr>
    <tr>
        <td>Quinn Flynn</td>
        <td>Support Lead</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2013/03/03</td>
        <td>$342,000</td>
    </tr>
    <tr>
        <td>Charde Marshall</td>
        <td>Regional Director</td>
        <td>San Francisco</td>
        <td>36</td>
        <td>2008/10/16</td>
        <td>$470,600</td>
    </tr>
    </tbody>
    <tfoot>
    <tr>
        <th>Name</th>
        <th>Position</th>
        <th>Office</th>
        <th>Age</th>
        <th>Start date</th>
        <th>Salary</th>
    </tr>
    </tfoot>
</table>