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/**
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* Due to the fact that DataTables moves DOM elements around (mainly `dt-tag tr`
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* elements for sorting and filtering) it can at times be a little tricky to get
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* the next row based on another, while taking into account pagination,
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* filtering, sorting etc.
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*
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* This function is designed to address exactly this situation. It takes two
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* parameters, the target node, and a boolean indicating if the adjacent row
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* retrieved should be the next (`true`, or no value) or the previous (`false`).
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*
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* @name fnGetAdjacentTr
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* @summary Get the adjacent `dt-tag tr` element for a row.
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* @author [Allan Jardine](http://sprymedia.co.uk)
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*
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* @param {node} nTr `dt-tag tr` element to get the adjacent element of
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* @param {boolean} [bNext=true] Get the next (`true`), or previous (`false`)
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* `dt-tag tr` element.
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* @returns {node} `dt-tag tr` element or null if not found.
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*
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* @example
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* $(document).ready(function() {
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* var table = $('#example').dataTable();
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*
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* var n1 = $('#example tbody tr').eq(2)[0];
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* var next = table.fnGetAdjacentTr( n1 );
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* var prev = table.fnGetAdjacentTr( n1, false );
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* } );
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*/
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jQuery.fn.dataTableExt.oApi.fnGetAdjacentTr = function ( oSettings, nTr, bNext )
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{
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/* Find the node's position in the aoData store */
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var iCurrent = oSettings.oApi._fnNodeToDataIndex( oSettings, nTr );
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/* Convert that to a position in the display array */
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var iDisplayIndex = $.inArray( iCurrent, oSettings.aiDisplay );
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if ( iDisplayIndex == -1 )
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{
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/* Not in the current display */
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return null;
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}
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/* Move along the display array as needed */
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iDisplayIndex += (typeof bNext=='undefined' || bNext) ? 1 : -1;
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/* Check that it within bounds */
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if ( iDisplayIndex < 0 || iDisplayIndex >= oSettings.aiDisplay.length )
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{
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/* There is no next/previous element */
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return null;
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}
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/* Return the target node from the aoData store */
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return oSettings.aoData[ oSettings.aiDisplay[ iDisplayIndex ] ].nTr;
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};
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