webapp/resources/datatables-1.9.4/media/src/core/core.page.js

   1
   2
   3 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
   4  * Note that most of the paging logic is done in
   5  * DataTable.ext.oPagination
   6  */
   7
   8 /**
   9  * Generate the node required for default pagination
  10  *  @param {object} oSettings dataTables settings object
  11  *  @returns {node} Pagination feature node
  12  *  @memberof DataTable#oApi
  13  */
  14 function _fnFeatureHtmlPaginate ( oSettings )
  15 {
  16         if ( oSettings.oScroll.bInfinite )
  17         {
  18                 return null;
  19         }
  20
  21         var nPaginate = document.createElement( 'div' );
  22         nPaginate.className = oSettings.oClasses.sPaging+oSettings.sPaginationType;
  23
  24         DataTable.ext.oPagination[ oSettings.sPaginationType ].fnInit( oSettings, nPaginate,
  25                 function( oSettings ) {
  26                         _fnCalculateEnd( oSettings );
  27                         _fnDraw( oSettings );
  28                 }
  29         );
  30
  31         /* Add a draw callback for the pagination on first instance, to update the paging display */
  32         if ( !oSettings.aanFeatures.p )
  33         {
  34                 oSettings.aoDrawCallback.push( {
  35                         "fn": function( oSettings ) {
  36                                 DataTable.ext.oPagination[ oSettings.sPaginationType ].fnUpdate( oSettings, function( oSettings ) {
  37                                         _fnCalculateEnd( oSettings );
  38                                         _fnDraw( oSettings );
  39                                 } );
  40                         },
  41                         "sName": "pagination"
  42                 } );
  43         }
  44         return nPaginate;
  45 }
  46
  47
  48 /**
  49  * Alter the display settings to change the page
  50  *  @param {object} oSettings dataTables settings object
  51  *  @param {string|int} mAction Paging action to take: "first", "previous", "next" or "last"
  52  *    or page number to jump to (integer)
  53  *  @returns {bool} true page has changed, false - no change (no effect) eg 'first' on page 1
  54  *  @memberof DataTable#oApi
  55  */
  56 function _fnPageChange ( oSettings, mAction )
  57 {
  58         var iOldStart = oSettings._iDisplayStart;
  59
  60         if ( typeof mAction === "number" )
  61         {
  62                 oSettings._iDisplayStart = mAction * oSettings._iDisplayLength;
  63                 if ( oSettings._iDisplayStart > oSettings.fnRecordsDisplay() )
  64                 {
  65                         oSettings._iDisplayStart = 0;
  66                 }
  67         }
  68         else if ( mAction == "first" )
  69         {
  70                 oSettings._iDisplayStart = 0;
  71         }
  72         else if ( mAction == "previous" )
  73         {
  74                 oSettings._iDisplayStart = oSettings._iDisplayLength>=0 ?
  75                         oSettings._iDisplayStart - oSettings._iDisplayLength :
  76                         0;
  77
  78                 /* Correct for under-run */
  79                 if ( oSettings._iDisplayStart < 0 )
  80                 {
  81                   oSettings._iDisplayStart = 0;
  82                 }
  83         }
  84         else if ( mAction == "next" )
  85         {
  86                 if ( oSettings._iDisplayLength >= 0 )
  87                 {
  88                         /* Make sure we are not over running the display array */
  89                         if ( oSettings._iDisplayStart + oSettings._iDisplayLength < oSettings.fnRecordsDisplay() )
  90                         {
  91                                 oSettings._iDisplayStart += oSettings._iDisplayLength;
  92                         }
  93                 }
  94                 else
  95                 {
  96                         oSettings._iDisplayStart = 0;
  97                 }
  98         }
  99         else if ( mAction == "last" )
 100         {
 101                 if ( oSettings._iDisplayLength >= 0 )
 102                 {
 103                         var iPages = parseInt( (oSettings.fnRecordsDisplay()-1) / oSettings._iDisplayLength, 10 ) + 1;
 104                         oSettings._iDisplayStart = (iPages-1) * oSettings._iDisplayLength;
 105                 }
 106                 else
 107                 {
 108                         oSettings._iDisplayStart = 0;
 109                 }
 110         }
 111         else
 112         {
 113                 _fnLog( oSettings, 0, "Unknown paging action: "+mAction );
 114         }
 115         $(oSettings.oInstance).trigger('page', oSettings);
 116
 117         return iOldStart != oSettings._iDisplayStart;
 118 }
 119