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DataTables lengthChange Option

  • Last Updated : 31 May, 2021

DataTables is jQuery plugin that can be used for adding interactive and advanced controls to HTML tables for the webpage. This also allows the data in the table to be searched, sorted, and filtered according to the needs of the user. The DataTable also exposes a powerful API that can be further used to modify how the data is displayed.

The lengthChange option is used to specify whether the dropdown to change the number of rows per page is displayed or not. This dropdown is shown only when paging of the DataTable is enabled, as disabling it automatically removes the dropdown. A true value displays the dropdown and a false value removes it.

Syntax:

{ lengthChange: value }

Option Value: This option has a single value as mentioned above and described below:

  • value: This is a boolean value that specifies whether the dropdown to change the number of rows is displayed or not. The default value is true.

The below example illustrates the use of this option.



Example 1: This example disables the changing of the rows per page by removing the dropdown.

HTML




<html>
<head>
  <!-- jQuery -->
  <script type="text/javascript"
          src="https://code.jquery.com/jquery-3.5.1.js">
  </script>
  
  <!-- DataTables CSS -->
  <link rel="stylesheet"
        href=
  
  <!-- DataTables JS -->
  <script src=
  </script>
</head>
<body>
  <h1 style="color: green;">
    GeeksForGeeks
  </h1>
  <h3>DataTables lengthChange Option</h3>
  
  <!-- HTML table with student data -->
  <table id="tableID" class="display">
    <thead>
      <tr>
        <th>ID</th>
        <th>Name</th>
        <th>Age</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>1</td>
        <td>Sam</td>
        <td>35</td>
      </tr>
      <tr>
        <td>2</td>
        <td>Sam</td>
        <td>30</td>
      </tr>
      <tr>
        <td>3</td>
        <td>Sameer</td>
        <td>45</td>
      </tr>
      <tr>
        <td>4</td>
        <td>Rob</td>
        <td>4</td>
      </tr>
      <tr>
        <td>5</td>
        <td>Robber</td>
        <td>68</td>
      </tr>
      <tr>
        <td>6</td>
        <td>Mikasa</td>
        <td>25</td>
      </tr>
      <tr>
        <td>7</td>
        <td>Eren</td>
        <td>23</td>
      </tr>
      <tr>
        <td>8</td>
        <td>Jean</td>
        <td>35</td>
      </tr>
      <tr>
        <td>9</td>
        <td>Walter</td>
        <td>65</td>
      </tr>
      <tr>
        <td>10</td>
        <td>Jessie</td>
        <td>28</td>
      </tr>
      <tr>
        <td>11</td>
        <td>Gabi</td>
        <td>20</td>
      </tr>
      <tr>
        <td>12</td>
        <td>Tim</td>
        <td>30</td>
      </tr>
      <tr>
        <td>13</td>
        <td>Max</td>
        <td>35</td>
      </tr>
    </tbody>
  </table>
  <script>
  
    // Initialize the DataTable
    $(document).ready(function () {
      $('#tableID').DataTable({
  
        // Disable the option to change
        // length in the DataTable
        lengthChange: false
      });
    }); 
  </script>
</body>
</html>

Output:

Example 2: This example enables the changing of the rows per page of the DataTable.

HTML




<html>
<head>
  <!-- jQuery -->
  <script type="text/javascript"
          src="https://code.jquery.com/jquery-3.5.1.js">
  </script>
  
  <!-- DataTables CSS -->
  <link rel="stylesheet"
        href=
  
  <!-- DataTables JS -->
  <script src=
  </script>
</head>
<body>
  <h1 style="color: green;">
    GeeksForGeeks
  </h1>
  <h3>DataTables lengthChange Option</h3>
  
  <!-- HTML table with student data -->
  <table id="tableID" class="display">
    <thead>
      <tr>
        <th>ID</th>
        <th>Name</th>
        <th>Age</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>1</td>
        <td>Sam</td>
        <td>35</td>
      </tr>
      <tr>
        <td>2</td>
        <td>Sam</td>
        <td>30</td>
      </tr>
      <tr>
        <td>3</td>
        <td>Sameer</td>
        <td>45</td>
      </tr>
      <tr>
        <td>4</td>
        <td>Rob</td>
        <td>4</td>
      </tr>
      <tr>
        <td>5</td>
        <td>Robber</td>
        <td>68</td>
      </tr>
      <tr>
        <td>6</td>
        <td>Mikasa</td>
        <td>25</td>
      </tr>
      <tr>
        <td>7</td>
        <td>Eren</td>
        <td>23</td>
      </tr>
      <tr>
        <td>8</td>
        <td>Jean</td>
        <td>35</td>
      </tr>
      <tr>
        <td>9</td>
        <td>Walter</td>
        <td>65</td>
      </tr>
      <tr>
        <td>10</td>
        <td>Jessie</td>
        <td>28</td>
      </tr>
      <tr>
        <td>11</td>
        <td>Gabi</td>
        <td>20</td>
      </tr>
      <tr>
        <td>12</td>
        <td>Tim</td>
        <td>30</td>
      </tr>
      <tr>
        <td>13</td>
        <td>Max</td>
        <td>35</td>
      </tr>
    </tbody>
  </table>
  <script>
  
    // Initialize the DataTable
    $(document).ready(function () {
      $('#tableID').DataTable({
  
        // Enable the option to change
        // length in the DataTable
        lengthChange: true
      });
    }); 
  </script>
</body>
</html>

Output:




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