actionscript 3 - DataGrid - sort a column based on its own values, and secondarily based on another columns values? -

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i have advanceddatagrid 2 columns: code (strings), , value (numbers). use same sort function each column. want sort both columns based on value column (numeric data), there no number available, want sorting done alphabetically code column.

i have simplified problem facing example represent trying do:

the picture shows 2 columns, sorting of both columns based on value column. value nan, want code column values sorted alphabetically. one, two, three, 4 remain same, badc abcd.

enter image description here

<mx:application xmlns:mx="http://www.adobe.com/2006/mxml"                  layout="absolute" minwidth="955" minheight="600" initialize="initializehandler(event)">      <mx:script>         <![cdata[             import mx.collections.arraycollection;             import mx.events.flexevent;             import mx.utils.objectutil;              [bindable]             private var ac:arraycollection;              protected function initializehandler(event:flexevent):void             {                 ac = new arraycollection();                  var one:namevalueobject = new namevalueobject("one", 1);                 var two:namevalueobject = new namevalueobject("two", 2);                 var three:namevalueobject = new namevalueobject("three", 3);                 var four:namevalueobject = new namevalueobject("four", 4);                 var a:namevalueobject = new namevalueobject("a", nan);                 var b:namevalueobject = new namevalueobject("b", nan);                 var c:namevalueobject = new namevalueobject("c", nan);                 var d:namevalueobject = new namevalueobject("d", nan);                  ac.additem(one);                 ac.additem(two);                 ac.additem(three);                 ac.additem(four);                 ac.additem(b);                 ac.additem(a);                 ac.additem(d);                 ac.additem(c);                           }              private function numericvaluesort(obj1:object, obj2:object):int             {                 var value1:number = (obj1 namevalueobject).value;                 var value2:number = (obj2 namevalueobject).value;                  return objectutil.numericcompare(value1, value2);             }              private function codelabelfunction(item:object, column:advanceddatagridcolumn):string             {                 return (item namevalueobject).code;             }          ]]>     </mx:script>      <mx:advanceddatagrid width="500" height="300" dataprovider="{ac}">         <mx:columns>             <mx:advanceddatagridcolumn id="codecolumn"                                         headertext="code"                                        datafield="value"                                        labelfunction="codelabelfunction"                                        sortcomparefunction="numericvaluesort">              </mx:advanceddatagridcolumn>             <mx:advanceddatagridcolumn id="numericvaluecolumn"                                         headertext="value"                                        datafield="value"                                        sortcomparefunction="numericvaluesort">              </mx:advanceddatagridcolumn>         </mx:columns>     </mx:advanceddatagrid> </mx:application>

the navevalueobject class

package {     public class namevalueobject     {         public var code:string;         public var value:number;          public function namevalueobject(acode:string, anumber:number)         {             code = acode;             value = anumber;         }     } }

try this:

private function numericvaluesort(obj1:object, obj2:object):int {     var o1:namevalueobject = obj1 namevalueobject;     var o2:namevalueobject = obj2 namevalueobject;      var ret:int = 0;     if (isnan(o1.value) || isnan(o2.value)) {         if (o1.code > o2.code) {             ret = 1;         } else if (o1.code < o2.code){             ret = -1;         }     } else {         ret = objectutil.numericcompare(o1.value, o2.value);     }     return ret; }

your function process number either valued, comparation between code field of 2 objects


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