Columns require an id when using a non-string header

Explanation:

The error message “columns require an id when using a non-string header” is encountered when working with a table or data grid in HTML and JavaScript.

This error suggests that when defining the headers for the columns in the table, an id attribute is required for each column. This id should be a string value.

Here is an example that explains this further:

<table>
  <thead>
    <tr>
      <th id=1>Column 1</th>
      <th id=2>Column 2</th>
      <th id=3>Column 3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Data 1</td>
      <td>Data 2</td>
      <td>Data 3</td>
    </tr>
    <tr>
      <td>Data 4</td>
      <td>Data 5</td>
      <td>Data 6</td>
    </tr>
  </tbody>
</table>

In the above example, a table is created with three columns. Each column header is defined using the <th> element and has an id attribute (1, 2, and 3) which are string values.

It is important to note that the id attribute should be unique for each column to avoid conflicts and ensure proper functioning.