Drop and add item in Array

I'm looking for a way to add a item in a list in a drop position.
How can i do that?

i tried to do that without success

`<div ui-sortable ng-model="landing.header">
        <div ng-repeat="value in landing.header | unique:src" class=""
             ng-model="landing.header" data-drop="true"
             jqyoui-droppable="{index:{{$index}},multiple:true, stack:true}">`