Flex Actionscript Goodness : Finding and Removing a Object from ArrayCollection(IViewCursor and Sort)

There is always a need to find a particular object or remove it from the ArrayCollection class based on a various member variable conditions.

IViewCursor and Sort classes of mx.collections are a perfect fit for it

Goal: Find employee by empId and remove it

Step1 : Lets Create a ArrayCollection of two Employees

   1: public class EmployeeVo{

   2:     var empNo:String

   3:     var firstName:String

   4:     var lastName:String

   5: }

   6:  

   7: var empVo1:EmployeeVo = new EmployeeVo()

   8: empVo1.empNo=1

   9: empVo1.firstName="john"

  10: empVo1.lastName="tyson"

  11:  

  12: var empVo2:EmployeeVo = new EmployeeVo()

  13: empVo2.empNo=2

  14: empVo2.firstName="ram"

  15: empVo2.lastName="balram"

  16:  

  17: var empCol:ArrayCollection = new ArrayCollection()

  18: empCol.addItem(empVo1)

  19: empCol.addItem(empVo2)

  20:  

  21:  

  22:  

  23:  

Step2 : Sort the employee Vo Class by empId And Find it / Remove it

Note: Sort it needed first in order to use the IViewCursor

   1: import mx.collections.IViewCursor

   2: import mx.collections.Sort

   3: pubic function findAndDeleteEmp(empId:String):void{    

   4:    addSort()

   5:    var cursor:IViewCursor = empCol.createCursor()

   6:    var searchEmpVo:EmployeeVo = new EmployeeVo()

   7:    searchEmpVo.empId = empId

   8:    var isExisting:Boolean = cursor.findAny(searchEmpVo)

   9:    if(isExisting){

  10:        //to get the found object

  11:        var foundEmpVo:EmployeeVo = cursor.currentItem as EmployeeVo

  12:        //to remove the found object

  13:        var deletedObj:EmployeeVo =cursor.remove() as EmployeeVo

  14:    }

  15: }

  16:  

  17: public function addSort():void{

  18:    //Add Sorting to Array Collection

  19:     var fieldName:String = "empId"

  20:     var sortField:SortField = new SortField(fieldName, true,descending);

  21:     var sort:Sort = new Sort();

  22:     sort.fields = new Array(sortField)    

  23:     empCol.sort = sort

  24:     empCol.refresh()

  25: }

Step3: Done!! Hurray!!!