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

   1
   2
   3 /**
   4  * Generate the node required for user display length changing
   5  *  @param {object} oSettings dataTables settings object
   6  *  @returns {node} Display length feature node
   7  *  @memberof DataTable#oApi
   8  */
   9 function _fnFeatureHtmlLength ( oSettings )
  10 {
  11         if ( oSettings.oScroll.bInfinite )
  12         {
  13                 return null;
  14         }
  15
  16         /* This can be overruled by not using the _MENU_ var/macro in the language variable */
  17         var sName = 'name="'+oSettings.sTableId+'_length"';
  18         var sStdMenu = '<select size="1" '+sName+'>';
  19         var i, iLen;
  20         var aLengthMenu = oSettings.aLengthMenu;
  21
  22         if ( aLengthMenu.length == 2 && typeof aLengthMenu[0] === 'object' &&
  23                         typeof aLengthMenu[1] === 'object' )
  24         {
  25                 for ( i=0, iLen=aLengthMenu[0].length ; i<iLen ; i++ )
  26                 {
  27                         sStdMenu += '<option value="'+aLengthMenu[0][i]+'">'+aLengthMenu[1][i]+'</option>';
  28                 }
  29         }
  30         else
  31         {
  32                 for ( i=0, iLen=aLengthMenu.length ; i<iLen ; i++ )
  33                 {
  34                         sStdMenu += '<option value="'+aLengthMenu[i]+'">'+aLengthMenu[i]+'</option>';
  35                 }
  36         }
  37         sStdMenu += '</select>';
  38
  39         var nLength = document.createElement( 'div' );
  40         if ( !oSettings.aanFeatures.l )
  41         {
  42                 nLength.id = oSettings.sTableId+'_length';
  43         }
  44         nLength.className = oSettings.oClasses.sLength;
  45         nLength.innerHTML = '<label>'+oSettings.oLanguage.sLengthMenu.replace( '_MENU_', sStdMenu )+'</label>';
  46
  47         /*
  48          * Set the length to the current display length - thanks to Andrea Pavlovic for this fix,
  49          * and Stefan Skopnik for fixing the fix!
  50          */
  51         $('select option[value="'+oSettings._iDisplayLength+'"]', nLength).attr("selected", true);
  52
  53         $('select', nLength).bind( 'change.DT', function(e) {
  54                 var iVal = $(this).val();
  55
  56                 /* Update all other length options for the new display */
  57                 var n = oSettings.aanFeatures.l;
  58                 for ( i=0, iLen=n.length ; i<iLen ; i++ )
  59                 {
  60                         if ( n[i] != this.parentNode )
  61                         {
  62                                 $('select', n[i]).val( iVal );
  63                         }
  64                 }
  65
  66                 /* Redraw the table */
  67                 oSettings._iDisplayLength = parseInt(iVal, 10);
  68                 _fnCalculateEnd( oSettings );
  69
  70                 /* If we have space to show extra rows (backing up from the end point - then do so */
  71                 if ( oSettings.fnDisplayEnd() == oSettings.fnRecordsDisplay() )
  72                 {
  73                         oSettings._iDisplayStart = oSettings.fnDisplayEnd() - oSettings._iDisplayLength;
  74                         if ( oSettings._iDisplayStart < 0 )
  75                         {
  76                                 oSettings._iDisplayStart = 0;
  77                         }
  78                 }
  79
  80                 if ( oSettings._iDisplayLength == -1 )
  81                 {
  82                         oSettings._iDisplayStart = 0;
  83                 }
  84
  85                 _fnDraw( oSettings );
  86         } );
  87
  88
  89         $('select', nLength).attr('aria-controls', oSettings.sTableId);
  90
  91         return nLength;
  92 }
  93
  94
  95 /**
  96  * Recalculate the end point based on the start point
  97  *  @param {object} oSettings dataTables settings object
  98  *  @memberof DataTable#oApi
  99  */
 100 function _fnCalculateEnd( oSettings )
 101 {
 102         if ( oSettings.oFeatures.bPaginate === false )
 103         {
 104                 oSettings._iDisplayEnd = oSettings.aiDisplay.length;
 105         }
 106         else
 107         {
 108                 /* Set the end point of the display - based on how many elements there are
 109                  * still to display
 110                  */
 111                 if ( oSettings._iDisplayStart + oSettings._iDisplayLength > oSettings.aiDisplay.length ||
 112                            oSettings._iDisplayLength == -1 )
 113                 {
 114                         oSettings._iDisplayEnd = oSettings.aiDisplay.length;
 115                 }
 116                 else
 117                 {
 118                         oSettings._iDisplayEnd = oSettings._iDisplayStart + oSettings._iDisplayLength;
 119                 }
 120         }
 121 }
 122