Hierarchical Bindings

Hierarchical binding can be used to create the Grid with parent and child relation, this facilitate you to view the child records for a particular row by clicking on the Expander button present in first column of each grid row. This can be enabled by defining ChildGrid and QueryString.

The ChildGrid property is used to define the model properties that has to be applied on the child grid. The ChildGrid is the extended class of the base class grid such that it holds all the properties of the grid. The QueryString is a property that has to be specified within the ChildGrid, which defines the relation between the parent and child grid. The QueryString property is used to denote the primaryKey field of the parent grid which is to be mapped with the foreignKey field of the child grid. Based on the mapping, the child grid records are filtered from the table and is bound as datasource for the child grid.

If the foreign key column name differs for parent and child grid then use ForeignKeyField property of child grid. Refer here for more information.

NOTE

The responsive and exporting support is not applicable for Hierarchical binding.

@(Html.EJ().Grid<EmployeeView>("HierarchyGrid")
        .Datasource((IEnumerable<object>)ViewBag.datasource)
        .Columns(col =>
        {
            col.Field("EmployeeID").HeaderText("Employee ID").TextAlign(TextAlign.Right).Width(85).Add();
            col.Field("FirstName").HeaderText("First Name").Width(100).Add();
            col.Field("Title").Width(120).Add();
            col.Field("City").Width(100).Add();
            col.Field("Country").Width(100).Add();
        })
                 .ChildGrid(child =>
                 {
                     child.Datasource("http://js.syncfusion.com/demos/ejServices/Wcf/Northwind.svc/Orders")
                        .QueryString("EmployeeID")
                        .AllowPaging()
                        .PageSettings(page => page.PageSize(5))
                        .Columns(col =>
                        {
                            col.Field("OrderID").HeaderText("OrderID").TextAlign(TextAlign.Right).Width(75).Add();
                            col.Field("ShipCity").HeaderText("ShipCity").Width(100).Add();
                            col.Field("Freight").Width(120).Add();
                            col.Field("ShipName").Width(100).Add();
                        });
                 })

)
public partial class GridController : Controller

{

	//

	// GET: /HierarchyGrid/

	 public ActionResult HierarchyGrid()

        {

            var DataSource = new NorthwindDataContext().EmployeeViews.ToList();

            ViewBag.datasource = DataSource;

            return View();

        }

}

Expand or collapse all child’s

The grid can able to expand and collapse all the ChildGrid through programmatically using the expandAll and collapseAll method.

<button id="expand">expandAll</button>
<button id="collapse">collapseAll</button>

 @(Html.EJ().Grid<EmployeeView>("HierarchyGrid")
        .Datasource((IEnumerable<object>)ViewBag.datasource)
        .ChildGrid(child =>
        {
            child.Datasource((IEnumerable<object>)ViewBag.datasource2)
               .QueryString("EmployeeID")
               .AllowPaging()
               .PageSettings(page => page.PageSize(5))
               .Columns(col =>
               {
                   col.Field("OrderID").HeaderText("OrderID").TextAlign(TextAlign.Right).Width(75).Add();
                   col.Field("ShipCity").HeaderText("ShipCity").Width(100).Add();
                   col.Field("Freight").Width(120).Add();
                   col.Field("ShipName").Width(100).Add();
               });
        })

)

<script type="text/javascript">
   
    $("#expand,#collapse").ejButton({
        showRoundedCorner: true,
        size: "mini",
        width: 150,
        click: function (args) {
            $("#HierarchyGrid").ejGrid(args.model.text); //invokes expandAll & collapseAll method based on button name
        }
    });
</script>
public partial class GridController : Controller

{

	//

	// GET: /HierarchyGrid/

	 public ActionResult HierarchyGrid()

        {

            var DataSource = new NorthwindDataContext().EmployeeViews.ToList();
            
            var DataSource2 = new NorthwindDataContext().OrdersViews.ToList();

            ViewBag.datasource = DataSource;
            
            ViewBag.datasource2 = DataSource2;

            return View();

        }

}