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Hierarchical Grid - Load on Demand

This sample demonstrates how to use the load on demand functionality of igHierarchicalGrid.

Category Name	Description	Products Count
Beverages	Soft drinks, coffees, teas, beers, and ales	12
Condiments	Sweet and savory sauces, relishes, spreads, and seasonings	12
Confections	Desserts, candies, and sweet breads	13
Dairy Products	Cheeses	10
Grains/Cereals	Breads, crackers, pasta, and cereal	7

This sample is designed for a larger screen size.

On mobile, try rotating your screen, view full size, or email to another device.

Load on demand functionality enables the hierarchical grid to request the data for the child layouts from the server as the user interacts with the grid (expands a layout). This approach significantly reduces the data being transferred between the browser and the server.
The grid in this sample is configured in the controller which is mandatory for load on demand scenario. When you expand a row the data for the child layout will be requested with an AJAX call from the server.

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ASP.NET View
ASP.NET Controller

@using Infragistics.Web.Mvc
@using IgniteUI.SamplesBrowser.Models.Northwind
@using System.Data
@model Infragistics.Web.Mvc.GridModel

<!DOCTYPE html>

<html>
<head>
    <title></title>

    <!-- Ignite UI for jQuery Required Combined CSS Files -->
    <link href="http://cdn-na.infragistics.com/igniteui/2024.2/latest/css/themes/infragistics/infragistics.theme.css" rel="stylesheet" />
    <link href="http://cdn-na.infragistics.com/igniteui/2024.2/latest/css/structure/infragistics.css" rel="stylesheet" />

    <script src="http://ajax.aspnetcdn.com/ajax/modernizr/modernizr-2.8.3.js"></script>
    <script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
    <script src="http://code.jquery.com/ui/1.11.1/jquery-ui.min.js"></script>

    <!-- Ignite UI for jQuery Required Combined JavaScript Files -->
    <script src="http://cdn-na.infragistics.com/igniteui/2024.2/latest/js/infragistics.core.js"></script>
    <script src="http://cdn-na.infragistics.com/igniteui/2024.2/latest/js/infragistics.lob.js"></script>
</head>
<body>

    @(Html.Infragistics().Grid(Model))

</body>
</html>

using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.Mvc;
using System.Linq;
using Infragistics.Web.Mvc;
using IgniteUI.SamplesBrowser.Models.Repositories;
using IgniteUI.SamplesBrowser.Application.Data;
using System.Collections.Generic;
using IgniteUI.SamplesBrowser.Models.Northwind;
using System;

namespace IgniteUI.SamplesBrowser.Controllers
{
    public class HierarchicalGridController : Controller
    {      
        [ActionName("aspnet-mvc-helper")]
        public ActionResult AspMvcHelper()
        {
            GridModel gridModel = GetGridModel();
            return View("aspnet-mvc-helper", gridModel);
        }
        
        [GridDataSourceAction]
        [ActionName("dataset-binding")]
        public ActionResult DataSetMvcHelper()
        {
            var categoriesProducts = this.CategoriesProducts;
            return View("dataset-binding", categoriesProducts);
        }

        [GridDataSourceAction]
        [ActionName("editing-dataset")]
        public ActionResult EditingDataSetMvcHelper()
        {
            var categoriesProducts = this.CategoriesProducts;
            return View("editing-dataset", categoriesProducts);
        }

        [ActionName("EditingSaveChanges")]
        public ActionResult EditingSaveChanges()
        {
            ViewData["GenerateCompactJSONResponse"] = false;
            GridModel m = new GridModel();
            List<Transaction<Category>> categoryTransactions = m.LoadTransactions<Category>(HttpContext.Request.Form["ig_transactions"]);
            foreach (Transaction<Category> t in categoryTransactions)
            {
                DataRow dr = this.CategoriesProducts.Tables["Categories"].Rows.Find(Int32.Parse(t.rowId));
                if ((t.layoutKey == null) && (dr != null))
                {
                    if (t.type == "row")
                    {
                        Category categoryRow = (Category)t.row;
                        if (categoryRow.CategoryName != null) {
                            dr["CategoryName"] = categoryRow.CategoryName;
                        }
                        if (categoryRow.Description != null){
                            dr["Description"] = categoryRow.Description;
                        }
                    } else if (t.type == "deleterow")
                    {
                        this.CategoriesProducts.Tables["Categories"].Rows.Remove(dr);
                    }
                }
            }
            List<Transaction<Product>> productTransactions = m.LoadTransactions<Product>(HttpContext.Request.Form["ig_transactions"]);
            foreach (Transaction<Product> t in productTransactions)
            {
                DataRow dr = this.CategoriesProducts.Tables["Products"].Rows.Find(Int32.Parse(t.rowId));
                if ((t.layoutKey == "Products") && (dr != null))
                {
                    if (t.type == "deleterow")
                    {
                        this.CategoriesProducts.Tables["Products"].Rows.Remove(dr);
                    }
                    else if (t.type == "row")
                    {
                        Product productRow = (Product)t.row;
                        if (productRow.ProductName != null)
                        {
                            dr["ProductName"] = productRow.ProductName;
                        }
                        if (productRow.CategoryID != null)
                        {
                            dr["CategoryID"] = productRow.CategoryID;
                        }
                        if (productRow.UnitPrice != null)
                        {
                            dr["UnitPrice"] = productRow.UnitPrice;
                        }
                        if (productRow.UnitsInStock != null)
                        {
                            dr["UnitsInStock"] = productRow.UnitsInStock;
                        }
                        dr["Discontinued"] = productRow.Discontinued;
                    }
                }
            }
            JsonResult result = new JsonResult();
            Dictionary<string, bool> response = new Dictionary<string, bool>();
            response.Add("Success", true);
            result.Data = response;
            return result;
        }

        [ActionName("load-on-demand")]
        public ActionResult DataSetWithLoadOnDemand()
        {
            GridModel grid = GridLoadOnDemandModel();
            grid.ID = "gridLoadOnDemand";
            grid.LoadOnDemand = true;
            grid.DataSourceUrl = this.Url.Action("BindParent");
            grid.ColumnLayouts[0].DataSourceUrl = this.Url.Action("BindChild");
            return View("load-on-demand", grid);
        }

        #region Grid Models
        private GridModel GetGridModel()
        {
            GridModel gridModel = new GridModel();
            gridModel.ID = "gridModel";
            gridModel.AutoGenerateColumns = false;
            gridModel.AutoGenerateLayouts = false;
            gridModel.PrimaryKey = "ID";
            gridModel.LoadOnDemand = false;
            gridModel.Width = "100%";
            gridModel.AutoFormat = GridAutoFormat.DateAndNumber;
            gridModel.Columns = new List<GridColumn>();
			gridModel.Columns.Add(new GridColumn() { HeaderText = "Category ID", Key = "ID", DataType = "number", Width = "15%", Hidden = true });
            gridModel.Columns.Add(new GridColumn() { HeaderText = "Category Name", Key = "CategoryName", DataType = "string", Width = "30%" });
            gridModel.Columns.Add(new GridColumn() { HeaderText = "Description", Key = "Description", DataType = "string", Width = "40%" });
            gridModel.Columns.Add(new GridColumn() { HeaderText = "Products Count", Key = "ProductCount", DataType = "number", Width = "15%" });
        
            gridModel.DataSourceUrl = this.Url.Action("GetCategoriesData");
            gridModel.DataSource = RepositoryFactory.GetCategoryRepository().Get().AsQueryable();

            GridColumnLayoutModel productsModel = GetProductsLayout();
            productsModel.AutoFormat = GridAutoFormat.DateAndNumber;
            gridModel.ColumnLayouts.Add(productsModel);

            gridModel.Features.Add(new GridFiltering() { Type = OpType.Remote, Inherit = true, Persist = false });
            gridModel.Features.Add(new GridSorting() { Type = OpType.Remote, Inherit = true, Persist = false });
            gridModel.Features.Add(new GridSummaries() { Type = OpType.Remote, Inherit = true });
            gridModel.Features.Add(new GridPaging() { Type = OpType.Remote, Inherit = true , PageSize = 5});
            gridModel.Features.Add(new GridResponsive() { 
                EnableVerticalRendering = false, 
                ColumnSettings = new List<ResponsiveColumnSetting>() { 
                    new ResponsiveColumnSetting() { ColumnKey = "ID", Classes = "ui-hidden-phone" },
                    new ResponsiveColumnSetting() { ColumnKey = "Description", Classes = "ui-hidden-phone" }
                } 
            });
    
            return gridModel;
        }

        private GridModel GridLoadOnDemandModel()
        {
            // Define the Categories layout
            GridModel grid = new GridModel();
            grid.AutoGenerateLayouts = false;
            grid.AutoGenerateColumns = false;
            grid.PrimaryKey = "ID";
            grid.Width = "100%";
            grid.Columns.Add(new GridColumn() { HeaderText = "Category ID", Key = "ID", DataType = "number", Width = "0%", Hidden = true});
            grid.Columns.Add(new GridColumn() { HeaderText = "Category Name", Key = "CategoryName", DataType = "string", Width = "30%" });
            grid.Columns.Add(new GridColumn() { HeaderText = "Description", Key = "Description", DataType = "string", Width = "50%" });
            grid.Columns.Add(new GridColumn() { HeaderText = "Products Count", Key = "ProductCount", DataType = "number", Width = "20%" });

            // Define the Products layout
            GridColumnLayoutModel layout = new GridColumnLayoutModel();
            layout.Key = "Products";
            layout.ForeignKey = "CategoryID";
            layout.PrimaryKey = "ID";
            layout.AutoGenerateColumns = false;
            layout.Columns.Add(new GridColumn() { HeaderText = "Product ID", Key = "ID", DataType = "number", Width = "0%", Hidden = true });
            layout.Columns.Add(new GridColumn() { HeaderText = "Category ID", Key = "CategoryID", DataType = "number",Width = "0%", Hidden = true});
            layout.Columns.Add(new GridColumn() { HeaderText = "Product Name", Key = "ProductName", DataType = "string",Width = "40%"});
            layout.Columns.Add(new GridColumn() { HeaderText = "Unit Price", Key = "UnitPrice", DataType = "number", Width = "30%" });
            layout.Columns.Add(new GridColumn() { HeaderText = "Units In Stock", Key = "UnitsInStock", DataType = "number", Width = "30%" });
            
            layout.Width = "100%";
            grid.ColumnLayouts.Add(layout);

            GridPaging paging = new GridPaging();
            paging.Type = OpType.Remote;
            paging.Inherit = true;
            paging.PageSize = 5;
            grid.Features.Add(paging);

            return grid;
        }
        #endregion // Grid Models

        #region Layouts

        private GridColumnLayoutModel GetProductsLayout()
        {
            GridColumnLayoutModel layout = new GridColumnLayoutModel();
            layout.Key = "Products";
            layout.PrimaryKey = "ID";
            layout.ForeignKey = "CategoryID";
            layout.Width = "100%";
            layout.AutoGenerateColumns = false;
            //layout.AutofitLastColumn = false;
            layout.Columns = new List<GridColumn>();
			layout.Columns.Add(new GridColumn() { HeaderText = "Product ID", Key = "ID", DataType = "number", Width = "15%" });
            layout.Columns.Add(new GridColumn() { HeaderText = "Product Name", Key = "ProductName", DataType = "string", Width = "20%"});
            layout.Columns.Add(new GridColumn() { HeaderText = "Unit Price", Key = "UnitPrice", DataType = "number", Width = "15%"});
            layout.Columns.Add(new GridColumn() { HeaderText = "Units In Stock", Key = "UnitsInStock", DataType = "number", Width = "15%"});
            layout.Columns.Add(new GridColumn() { HeaderText = "Category ID", Key = "CategoryID", DataType = "number", Width = "0%", Hidden = true });
            layout.Columns.Add(new GridColumn() { HeaderText = "Discontinued", Key = "Discontinued", DataType = "bool", Width = "15%" });
            layout.DataSourceUrl = this.Url.Action("GetProductsData");
            layout.Features.Add(new GridResponsive()
            {
                EnableVerticalRendering = false,
                ColumnSettings = new List<ResponsiveColumnSetting>() { 
                    new ResponsiveColumnSetting() { ColumnKey = "ID", Classes = "ui-hidden-phone ui-hidden-tablet" },
                    new ResponsiveColumnSetting() { ColumnKey = "UnitsInStock", Classes = "ui-hidden-phone ui-hidden-tablet" },
                    new ResponsiveColumnSetting() { ColumnKey = "UnitPrice", Classes = "ui-hidden-phone ui-hidden-tablet" }
                }
            });
            return layout;
        }

        #endregion // Layouts

        #region DataSourceUrls

        public JsonResult GetCategoriesData()
        {
            GridModel model = GetGridModel();
            return model.GetData();
        }
      
        public JsonResult GetProductsData(string path, string layout)
        {
            GridModel gridModel = GetGridModel();
            gridModel.DataSource = RepositoryFactory.GetProductRepository().Get();
            return gridModel.GetData(path, layout);
        }

        public JsonResult BindParent()
        {
            GridModel model = GridLoadOnDemandModel();
            model.DataSource = RepositoryFactory.GetCategoryRepository().Get();
            return model.GetData();
        }

        public JsonResult BindChild(string path, string layout)
        {
            GridModel model = GridLoadOnDemandModel();
            model.DataSource = RepositoryFactory.GetProductRepository().Get();
            return model.GetData(path, layout);
        }

        #endregion // DataSourceUrls

        #region SampleData

        private DataSet CategoriesProducts
        {
            get
            {
                if (Session["CategoriesProducts"] == null)
                {
                    Session["CategoriesProducts"] = GetCategoriesProductDataSet();
                }
                return (DataSet)Session["CategoriesProducts"];
            }
        }

        private DataSet GetCategoriesProductDataSet()
        {
            DataSet ds = new DataSet("CategoriesProductRecords");

            // Get the tables to use in the DataSet
            DataTable categories = this.GetCategoriesDataTable();
            DataTable products = this.GetProductsDataTable();

            // Add the tables to the DataSet
            ds.Tables.Add(categories);
            ds.Tables.Add(products);

            // Create the relationship between the tables.
            ds.Relations.Add("CategoryProductRel", categories.Columns["ID"], products.Columns["CategoryID"]);
            return ds;
        }

        private DataTable GetCategoriesDataTable()
        {
            string connString = new NorthwindContext().Database.Connection.ConnectionString;
            string selectCategoriesStmt = "Select CategoryID as ID, CategoryName, Description from Categories";

            SqlDataAdapter da = new SqlDataAdapter(selectCategoriesStmt, connString);
            DataTable dtData = new DataTable("Categories");
            da.Fill(dtData);

            dtData.PrimaryKey = new DataColumn[] { dtData.Columns["ID"] };
            return dtData;
        }

        private DataTable GetProductsDataTable()
        {
            string connString = new NorthwindContext().Database.Connection.ConnectionString;
            string selectProductsStmt = "Select ProductID as ID, ProductName, CategoryID, UnitPrice, UnitsInStock, Discontinued  from Products";

            SqlDataAdapter da = new SqlDataAdapter(selectProductsStmt, connString);
            DataTable dtData = new DataTable("Products");
            da.Fill(dtData);

            dtData.PrimaryKey = new DataColumn[] { dtData.Columns["ID"] };
            return dtData;
        }

        #endregion SampleData
    }

}

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Hierarchical Grid - Load on Demand

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