Through the use of the header and footer callback manipulation functions provided by DataTables (headerCallback and footerCallback), it is possible to perform some powerful and useful data manipulation functions, such as summarising data in the table.
The example below shows a footer callback being used to total the data for a column (both the visible and the hidden data) using the column().data() API method and column().footer() for writing the value into the footer.
| First name | Last name | Position | Office | Salary |
|---|---|---|---|---|
| Total: | ||||
| Tiger | Nixon | System Architect | Edinburgh | $320,800 |
| Garrett | Winters | Accountant | Tokyo | $170,750 |
| Ashton | Cox | Junior Technical Author | San Francisco | $86,000 |
| Cedric | Kelly | Senior Javascript Developer | Edinburgh | $433,060 |
| Airi | Satou | Accountant | Tokyo | $162,700 |
| Brielle | Williamson | Integration Specialist | New York | $372,000 |
| Herrod | Chandler | Sales Assistant | San Francisco | $137,500 |
| Rhona | Davidson | Integration Specialist | Tokyo | $327,900 |
| Colleen | Hurst | Javascript Developer | San Francisco | $205,500 |
| Sonya | Frost | Software Engineer | Edinburgh | $103,600 |
| Jena | Gaines | Office Manager | London | $90,560 |
| Quinn | Flynn | Support Lead | Edinburgh | $342,000 |
| Charde | Marshall | Regional Director | San Francisco | $470,600 |
| Haley | Kennedy | Senior Marketing Designer | London | $313,500 |
| Tatyana | Fitzpatrick | Regional Director | London | $385,750 |
| Michael | Silva | Marketing Designer | London | $198,500 |
| Paul | Byrd | Chief Financial Officer (CFO) | New York | $725,000 |
| Gloria | Little | Systems Administrator | New York | $237,500 |
| Bradley | Greer | Software Engineer | London | $132,000 |
| Dai | Rios | Personnel Lead | Edinburgh | $217,500 |
| Jenette | Caldwell | Development Lead | New York | $345,000 |
| Yuri | Berry | Chief Marketing Officer (CMO) | New York | $675,000 |
| Caesar | Vance | Pre-Sales Support | New York | $106,450 |
| Doris | Wilder | Sales Assistant | Sidney | $85,600 |
| Angelica | Ramos | Chief Executive Officer (CEO) | London | $1,200,000 |
| Gavin | Joyce | Developer | Edinburgh | $92,575 |
| Jennifer | Chang | Regional Director | Singapore | $357,650 |
| Brenden | Wagner | Software Engineer | San Francisco | $206,850 |
| Fiona | Green | Chief Operating Officer (COO) | San Francisco | $850,000 |
| Shou | Itou | Regional Marketing | Tokyo | $163,000 |
| Michelle | House | Integration Specialist | Sidney | $95,400 |
| Suki | Burks | Developer | London | $114,500 |
| Prescott | Bartlett | Technical Author | London | $145,000 |
| Gavin | Cortez | Team Leader | San Francisco | $235,500 |
| Martena | Mccray | Post-Sales support | Edinburgh | $324,050 |
| Unity | Butler | Marketing Designer | San Francisco | $85,675 |
| Howard | Hatfield | Office Manager | San Francisco | $164,500 |
| Hope | Fuentes | Secretary | San Francisco | $109,850 |
| Vivian | Harrell | Financial Controller | San Francisco | $452,500 |
| Timothy | Mooney | Office Manager | London | $136,200 |
| Jackson | Bradshaw | Director | New York | $645,750 |
| Olivia | Liang | Support Engineer | Singapore | $234,500 |
| Bruno | Nash | Software Engineer | London | $163,500 |
| Sakura | Yamamoto | Support Engineer | Tokyo | $139,575 |
| Thor | Walton | Developer | New York | $98,540 |
| Finn | Camacho | Support Engineer | San Francisco | $87,500 |
| Serge | Baldwin | Data Coordinator | Singapore | $138,575 |
| Zenaida | Frank | Software Engineer | New York | $125,250 |
| Zorita | Serrano | Software Engineer | San Francisco | $115,000 |
| Jennifer | Acosta | Junior Javascript Developer | Edinburgh | $75,650 |
| Cara | Stevens | Sales Assistant | New York | $145,600 |
| Hermione | Butler | Regional Director | London | $356,250 |
| Lael | Greer | Systems Administrator | London | $103,500 |
| Jonas | Alexander | Developer | San Francisco | $86,500 |
| Shad | Decker | Regional Director | Edinburgh | $183,000 |
| Michael | Bruce | Javascript Developer | Singapore | $183,000 |
| Donna | Snider | Customer Support | New York | $112,000 |
The Javascript shown below is used to initialise the table shown in this example:
$(document).ready(function() {
$('#example').DataTable( {
"footerCallback": function ( row, data, start, end, display ) {
var api = this.api(), data;
// Remove the formatting to get integer data for summation
var intVal = function ( i ) {
return typeof i === 'string' ?
i.replace(/[\$,]/g, '')*1 :
typeof i === 'number' ?
i : 0;
};
// Total over all pages
total = api
.column( 4 )
.data()
.reduce( function (a, b) {
return intVal(a) + intVal(b);
}, 0 );
// Total over this page
pageTotal = api
.column( 4, { page: 'current'} )
.data()
.reduce( function (a, b) {
return intVal(a) + intVal(b);
}, 0 );
// Update footer
$( api.column( 4 ).footer() ).html(
'$'+pageTotal +' ( $'+ total +' total)'
);
}
} );
} );
In addition to the above code, the following Javascript library files are loaded for use in this example:
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:
th { white-space: nowrap; }
The following CSS library files are loaded for use in this example to provide the styling of the table:
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.