# Responsive example Class control

You can tell Responsive what columns to want to be visible on different devices through the use of class names on the columns. The breakpoints are horizontal screen resolutions and the defaults are set for common devices:

- `desktop` x >= 1024px
- `tablet-l` (landscape) 768 <= x < 1024
- `tablet-p` (portrait) 480 <= x < 768
- `mobile-l` (landscape) 320 <= x < 480
- `mobile-p` (portrait) x < 320

You may leave the `-[lp]` option from the end if you wish to just target all tablet or mobile devices. Additionally to may add `min-`, `max-` or `not-` as a prefix to the class name to perform logic operations. For example `not-mobile` would cause a column to appear as visible on desktop and tablet devices, while `min-tablet-l` would require at least a horizontal width of 768 for the browser window to be shown, and be shown at all sizes larger.

Additionally, there are three special class names:

- `all` - Always display
- `none` - Don't display as a column, but show in the child row
- `never` - Never display
- `control` - Used for the `column` `responsive.details.typeR` option.

Please refer to the Responsive manual for further details of these options.

This example shows the `salary` column visible on a desktop only - `office` and `age` require a tablet, while the `position` column requires a phone in landscape or larger. The `name` column is always visible and the `start date` is never visible.

This can be useful if you wish to change the format of the data shown on different devices, for example using a combination of `mobile` and `not-mobile` on two different columns would allow information to be formatted suitable for each device type.

Name | Position | Office | Age | Start date | Salary | Extn.
--- | --- | --- | --- | --- | --- | ---
Name | Position | Office | Age | Start date | Salary | Extn.

- Javascript
- HTML
- CSS
- Ajax
- Server-side script

The Javascript shown below is used to initialise the table shown in this example:

`$(document).ready(function() { $('#example').DataTable( { "ajax": "../../../../examples/ajax/data/objects.txt", "columns": [ { "data": "name" }, { "data": "position" }, { "data": "office" }, { "data": "extn" }, { "data": "start_date" }, { "data": "salary" }, { "data": "extn" } ] } ); } );`

In addition to the above code, the following Javascript library files are loaded for use in this example:

- ../../../../media/js/jquery.js
- ../../../../media/js/jquery.dataTables.js
- ../../js/dataTables.responsive.js

The HTML shown below is the raw HTML table element, before it has been enhanced by DataTables:

This example uses a little bit of additional CSS beyond what is loaded from the library files (below), in order to correctly display the table. The additional CSS used is shown below:

``

The following CSS library files are loaded for use in this example to provide the styling of the table:

- ../../../../media/css/jquery.dataTables.css
- ../../css/dataTables.responsive.css

This table loads data by Ajax. The latest data that has been loaded is shown below. This data will update automatically as any additional data is loaded.

The script used to perform the server-side processing for this table is shown below. Please note that this is just an example script using PHP. Server-side processing scripts can be written in any language, using the protocol described in the DataTables documentation.