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Plugins/features/pageResize/dataTables.pageResize.js

151 lines
4.1 KiB
JavaScript

/*! PageResize for DataTables v1.0.0
* 2015 SpryMedia Ltd - datatables.net/license
*/
/**
* @summary PageResize
* @description Automatically alter the DataTables page length to fit the table
into a container
* @version 1.0.0
* @file dataTables.pageResize.js
* @author SpryMedia Ltd (www.sprymedia.co.uk)
* @contact www.sprymedia.co.uk/contact
* @copyright Copyright 2015 SpryMedia Ltd.
*
* License MIT - http://datatables.net/license/mit
*
* This feature plug-in for DataTables will automatically change the DataTables
* page length in order to fit inside its container. This can be particularly
* useful for control panels and other interfaces which resize dynamically with
* the user's browser window instead of scrolling.
*
* Page resizing in DataTables can be enabled by using any one of the following
* options:
*
* * Adding the class `pageResize` to the HTML table
* * Setting the `pageResize` parameter in the DataTables initialisation to
* be true - i.e. `pageResize: true`
* * Setting the `pageResize` parameter to be true in the DataTables
* defaults (thus causing all tables to have this feature) - i.e.
* `$.fn.dataTable.defaults.pageResize = true`.
* * Creating a new instance: `new $.fn.dataTable.PageResize( table );` where
* `table` is a DataTable's API instance.
*
* For more detailed information please see:
* http://datatables.net/blog/2015-04-10
*/
(function($){
var PageResize = function ( dt )
{
var table = dt.table();
this.s = {
dt: dt,
host: $(table.container()).parent(),
header: $(table.header()),
footer: $(table.footer()),
body: $(table.body()),
container: $(table.container()),
table: $(table.node())
};
var host = this.s.host;
if ( host.css('position') === 'static' ) {
host.css( 'position', 'relative' );
}
this._attach();
this._size();
};
PageResize.prototype = {
_size: function ()
{
var settings = this.s;
var dt = settings.dt;
var t = dt.table();
var offsetTop = $( settings.table ).offset().top;
var rowHeight = $( 'tr', settings.body ).eq(0).height();
var availableHeight = settings.host.height();
var scrolling = t.header().parentNode !== t.body().parentNode;
// Subtract the height of the header, footer and the elements
// surrounding the table
if ( ! scrolling ) {
availableHeight -= settings.header.height();
availableHeight -= settings.footer.height();
}
availableHeight -= offsetTop;
availableHeight -= settings.container.height() - ( offsetTop + settings.table.height() );
var drawRows = Math.floor( availableHeight / rowHeight );
if ( ! isNaN( drawRows ) && drawRows !== Infinity && drawRows !== dt.page.len() ) {
dt.page.len( drawRows ).draw();
}
},
_attach: function () {
// There is no `resize` event for elements, so to trigger this effect,
// create an empty HTML document using an <object> which will issue a
// resize event inside itself when the document resizes. Since it is
// 100% x 100% that will occur whenever the host element is resized.
var that = this;
var obj = $('<object/>')
.css( {
position: 'absolute',
top: 0,
left: 0,
height: '100%',
width: '100%',
zIndex: -1
} )
.attr( 'type', 'text/html' );
obj[0].onload = function () {
var body = this.contentDocument.body;
var height = body.offsetHeight;
this.contentDocument.defaultView.onresize = function () {
var newHeight = body.clientHeight || body.offsetHeight;
if ( newHeight !== height ) {
height = newHeight;
that._size();
}
};
};
obj
.appendTo( this.s.host )
.attr( 'data', 'about:blank' );
}
};
$.fn.dataTable.PageResize = PageResize;
$.fn.DataTable.PageResize = PageResize;
// Automatic initialisation listener
$(document).on( 'init.dt', function ( e, settings ) {
if ( e.namespace !== 'dt' ) {
return;
}
var api = new $.fn.dataTable.Api( settings );
if ( $( api.table().node() ).hasClass( 'pageResize' ) ||
settings.oInit.pageResize ||
$.fn.dataTable.defaults.pageResize )
{
new PageResize( api );
}
} );
}(jQuery));