Set Model property on combobox selection changed MVC

[ShaileshAggarwal]

I have bound my view to a Model inside controller on Index action

public ActionResult Index()
{
RequisitionViewModel reqViewModel = new RequisitionViewModel();
reqViewModel.ReqModel = GetModelData();
return View(reqViewModel);
}

Now there is a property in the model which is bound to combobox on the view. What I am trying to do now is when user selects a value in the combobox another combobox should get filled based on the selected value.
I am looking for a solution to do this inside controller with the help of model. Is there any way to do it?

Something like below:-

View

<div class="form-group">
@Html.LabelFor(x => x.ReqModel.Project, new { @class = "control-label" })
@Html.DropDownListFor(x => x.ReqModel.Project, @Model.ReqModel.Project, new { @class = "form-control", onchange = "Project_Selection_Changed()" })
</div>

function Project_Selection_Changed() {
//How to call controller action method by passing entire model object?
}

The problem is I dont know how to pass the entire model On comboBox selection changed.

[HttpPost]
public ActionResult GetMR_NumbersForProject(RequisitionViewModel reqViewModel)
{
reqViewModel.ReqModel.Documents =
GetListFromSelectedValue(reqViewModel.ReqModel.SelectedProject)
return View(reqViewModel);
}
Can someone help me with this?

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