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