Asp.net mvc dropdownlistfor onchange event

Question

List<Saras.SIMS.BehaviorMgmt.Entity.AchievementTypes> records = (from rcd in entity.AchievementType

where rcd.OrganizationID == orgid && rcd.RecordState == 0

select new Saras.SIMS.BehaviorMgmt.Entity.AchievementTypes

{

AchievementTypeId = rcd.Id,

Name = rcd.Name,

Points = rcd.Points

}).ToList();

 

 

I am returning this list to view as Model.AchievementTypes 

 

<div class="col-xs-12 bottom20">

<div class="col-xs-12 subfont themecolor">Achievement type</div>

<div class="col-xs-12 mainfont">

@Html.DropDownListFor(m => m.AchievementTypeId, new SelectList(Model.AchievementTypes, "AchievementTypeId", "Name"), new { style = "width:100%" })

</div>

</div>

<div class="row">

<div class="col-xs-4 bottom20">

<div class="col-xs-12 subfont themecolor">Weightage points</div>

<div class="col-xs-12 mainfont">

@Html.ExcelTextBox(m => m.Weightage, new TextBoxAttributes().SetMaxlength("5").SetCheckSpecialCharacters("True").SetReadOnly(false).SetCssClass("form-control"))

</div>

</div>

 

 

Now Onchange of AchievementType I want to bind the Points Value present in Model.AchievementTypes to Weightage

 

 

Can any one please suggest me how to do it.