Customize the rendering of DataTables with a flexible number of table headers

Having the same number of table header columns and table data columns is a requirement when using DataTables. However, I am currently dealing with an issue where the number of my <th> tags fluctuates by plus or minus 2 based on certain conditions, while using the render function to display the corresponding <td> columns.
Unsurprisingly, DataTables is throwing an error (

Cannot read property 'style' of undefined
) due to this discrepancy.
I can't seem to find a way to eliminate the need for render functions or statically render the table headers.

columns: [
   {
   data: "some_id",
   render: function (data, type, row) {
      return "some content";
   },
   {
    data: "some_id", 
    render: function (data, type, row) {
       return "some content";
   }
]

This section is where the issue lies.

javascriptdatatables

Answer №1

When using DataTables, it is important to ensure that the number of columns in the <thead> matches the column count in the <tbody>. If you add columns in the `columns:[]` array without a corresponding column in the <thead>, it can lead to an internal DataTable JS error. To work around this issue, simply add an empty <th></th> in the header for those columns that are using render.

<table>
     <thead>
          <th>Column 1</th>
          <th>Column 2</th>
          <th></th>
     </thead>
</table>

Remember to include sortable and searchable attributes as false when adding items through render, especially if it involves interactive elements like buttons. This will prevent potential issues with users trying to sort or search on columns that are meant for display only or have actionable items not intended for search or sorting.

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