Ajax override - using localStorage for the data source
This example shows how the ajax
initialisation option can be used to replace the default Ajax call that Editor makes and instead use the browser's localStorage
abilities to save
the state of the table locally on the browser. This means that the user effectively has persistent storage, but it is available only to them on their current
browser.
The code in this example shows the ajax
option as a function that implements everything that is required
by Editor for data storage and retrieval. The 'create', 'edit' and 'remove' actions are each handled by storing the submitted data in a local variable,
which is then stored in local storage for data persistence.
Note that this example fully supports Editor's multi-row editing capability as it fully implements the client / server data interchange format Editor uses.
Although this particular use case is fairly limited, it does show how Editor's ajax
option can be used to intercept and manage the data requests that Editor makes. Expanding on this almost
any data storage system could be used from Firebase to WebSockets.
Item | Status |
---|---|
Item | Status |
- Javascript
- HTML
- CSS
- Ajax
- Server-side script
- Comments
The Javascript shown below is used to initialise the table shown in this example:
var editor; // use a global for the submit and return data rendering in the examples
$(document).ready(function() {
// Object that will contain the local state
var todo = {};
// Create or update the todo localStorage entry
if ( localStorage.getItem('todo') ) {
todo = JSON.parse( localStorage.getItem('todo') );
}
// Set up the editor
editor = new $.fn.dataTable.Editor( {
table: "#example",
fields: [
{
label: "Item:",
name: "item"
}, {
label: "Status:",
name: "status",
type: "radio",
def: "To do",
options: [ 'To do', 'Done' ]
}
],
ajax: function ( method, url, d, successCallback, errorCallback ) {
var output = { data: [] };
if ( d.action === 'create' ) {
// Create new row(s), using the current time and loop index as
// the row id
var dateKey = +new Date();
$.each( d.data, function (key, value) {
var id = dateKey+''+key;
value.DT_RowId = id;
todo[ id ] = value;
output.data.push( value );
} );
}
else if ( d.action === 'edit' ) {
// Update each edited item with the data submitted
$.each( d.data, function (id, value) {
value.DT_RowId = id;
$.extend( todo[ id ], value );
output.data.push( todo[ id ] );
} );
}
else if ( d.action === 'remove' ) {
// Remove items from the object
$.each( d.data, function (id) {
delete todo[ id ];
} );
}
// Store the latest `todo` object for next reload
localStorage.setItem( 'todo', JSON.stringify(todo) );
// Show Editor what has changed
successCallback( output );
}
} );
// Initialise the DataTable
$('#example').DataTable( {
dom: "Bfrtip",
data: $.map( todo, function (value, key) {
return value;
} ),
columns: [
{ data: "item" },
{ data: "status" }
],
select: true,
buttons: [
{ extend: "create", editor: editor },
{ extend: "edit", editor: editor },
{ extend: "remove", editor: editor }
]
} );
} );
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:
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.
Other examples
Advanced initialisation
- Data shown only in the form
- Data shown in table only
- Multi-item editing (rows, columns, cells)
- REST interface
- Complex (nested) JSON data source
- Ajax override - using localStorage for the data source
- Row ID source specification
- Compound database primary key
- DOM sourced table
- SQL VIEW
- Join tables - self referencing join
- Join tables - link table
- Join tables - one-to-many join
- Parent child editor
- File upload
- File upload (many)
Dates and time
- Date picker
- Formatted dates (server-side)
- Formatted dates (client-side)
- Date and time input
- Time inputs
- Time increment options
- Options - min and max dates
- Options - week numbers
- Options - disable days
- Internationalisation
- jQuery UI DatePicker
- jQuery UI DatePicker with custom formatting
- HTML5 date input