Infinite scroll sample

samples/grids/grid/infinite-scroll/App.razor

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+@using IgniteUI.Blazor.Controls
+@using System.Net.Http;
+@using Newtonsoft.Json;
+
+<div class="container vertical">
+    <div class="container vertical fill">
+        <IgbGrid AutoGenerate="false"
+                 Height="480px"
+                 Name="grid"
+                 Id="grid"
+                 Data="LocalData"
+                 @ref="grid"
+                 DataPreLoad="OnDataPreLoad">
+            <IgbColumn Name="ID"
+                       Field="ProductID"
+                       Header="ID">
+            </IgbColumn>
+
+            <IgbColumn Name="ProductName"
+                       Field="ProductName"
+                       Header="Product Name">
+            </IgbColumn>
+
+            <IgbColumn Name="QuantityPerUnit"
+                       Field="QuantityPerUnit"
+                       Header="Quantity Per Unit">
+            </IgbColumn>
+
+            <IgbColumn Name="UnitPrice"
+                       Field="UnitPrice"
+                       Header="Unit Price">
+            </IgbColumn>
+
+            <IgbColumn Name="OrderDate"
+                       Field="OrderDate"
+                       Header="Order Date">
+            </IgbColumn>
+
+            <IgbColumn Name="Discontinued"
+                       Field="Discontinued"
+                       Header="Discontinued">
+            </IgbColumn>
+
+        </IgbGrid>
+    </div>
+</div>
+
+@code {
+    @code {
+        protected readonly HttpClient Http = new HttpClient();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if (firstRender)
+            {
+                var grid = this.grid;
+                grid.IsLoading = true;
+                double dataViewSize = 480.0 / 50.0;
+                this.PageSize = Convert.ToInt32(Math.Floor(dataViewSize * 1.5));
+                // additional delay for TotalItemCount setter.
+                await Task.Delay(500);
+                var data = await GetDataRemote(1, this.PageSize);
+
+
+                this.CachedData = data;
+                this.LocalData = this.CachedData;
+
+                // for some reason if TotalItemCount is the same as the loaded records count it does not trigger loading events.
+                // so setting it to number of records + 1
+                grid.TotalItemCount = (this.PageSize * this.Page) + 1;
+                double pageCount = Math.Ceiling((double)this.TotalItems / (double)this.PageSize);
+                this.TotalPageCount = (int)pageCount;
+                grid.IsLoading = false;
+                StateHasChanged();
+            }
+
+        }
+
+        public async Task<List<NwinCustomdDataItem>> GetDataRemote(int page, int pageSize)
+        {
+            var url = "https://services.odata.org/V4/Northwind/Northwind.svc/Products";
+            int skip = (page - 1) * pageSize;
+            string query = String.Format("{0}?$count=true&$skip={1}&$top={2}", url, skip, pageSize);
+            NwindModel res = await Http.GetFromJsonAsync<NwindModel>(query);
+            this.TotalItems = res.Count;
+            return res.Value;
+
+        }
+
+        public async void OnDataPreLoad(IgbForOfStateEventArgs e)
+        {
+            int chunkSize = (int)e.Detail.ChunkSize;
+            int startIndex = (int)e.Detail.StartIndex;
+            int totalCount = (int)this.grid.TotalItemCount;
+
+            bool isLastChunk = totalCount == startIndex + chunkSize;
+            // when last chunk reached load another page of data
+            if (isLastChunk)
+            {
+                if (this.TotalPageCount == this.Page)
+                {
+                    this.LocalData = this.CachedData.Skip(startIndex).Take(chunkSize).ToList();
+                    return;
+                }
+
+                // add next page of remote data to cache
+                this.grid.IsLoading = true;
+                this.Page++;
+                var remoteData = await GetDataRemote(this.Page, this.PageSize);
+                this.CachedData.AddRange(remoteData);
+
+                var data = this.CachedData.Skip(startIndex).Take(chunkSize);
+                this.LocalData = data.ToList();
+                this.grid.IsLoading = false;
+                this.grid.TotalItemCount = Math.Min(this.Page * this.PageSize, this.TotalItems);
+            }
+            else
+            {
+                var data = this.CachedData.Skip(startIndex).Take(chunkSize).ToList();
+                this.LocalData = data;
+            }
+        }
+
+        private IgbGrid grid;
+        private int Page = 1;
+        private int PageSize = 0;
+        private int ChunkSize = 10;
+        private int TotalPageCount = 0;
+        private int TotalItems = 0;
+        public List<NwinCustomdDataItem> CachedData = new List<NwinCustomdDataItem>();
+
+        public List<NwinCustomdDataItem> LocalData = new List<NwinCustomdDataItem>();
+
+    }
+
+}

samples/grids/grid/infinite-scroll/BlazorClientApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <RazorLangVersion>3.0</RazorLangVersion>
+    <AssemblyName>Infragistics.Samples</AssemblyName>
+    <RootNamespace>Infragistics.Samples</RootNamespace>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <NoWarn>1701;1702,IDE0028,BL0005,0219,CS1998</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="IgniteUI.Blazor" Version="23.1.37" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="6.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="6.0.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="System.Net.Http.Json" Version="6.0.0" />
+  </ItemGroup>
+
+</Project>

samples/grids/grid/infinite-scroll/BlazorClientApp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29613.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BlazorClientApp", "BlazorClientApp.csproj", "{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FC52AAC8-4488-40AE-9621-75F6BA744B18}
+	EndGlobalSection
+EndGlobal

samples/grids/grid/infinite-scroll/NwindDataModel.cs

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+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+public class NwinCustomdDataItem
+{
+    public double ProductID { get; set; }
+    public string ProductName { get; set; }
+    public double SupplierID { get; set; }
+    public double CategoryID { get; set; }
+    public string QuantityPerUnit { get; set; }
+    public double UnitPrice { get; set; }
+    public double UnitsInStock { get; set; }
+    public double UnitsOnOrder { get; set; }
+    public double ReorderLevel { get; set; }
+    public bool Discontinued { get; set; }
+    public string OrderDate { get; set; }
+    public double Rating { get; set; }
+    public List<NwinCustomdDataItem_LocationsItem> Locations { get; set; }
+}
+public class NwinCustomdDataItem_LocationsItem
+{
+    public string Shop { get; set; }
+    public string LastInventory { get; set; }
+}
+
+public class NwindModel
+{
+    [JsonProperty("@odata.count")]
+    public int Count { get; set; } = 77;
+
+    [JsonProperty("value")]
+    public List<NwinCustomdDataItem> Value { get; set; }
+}

samples/grids/grid/infinite-scroll/Program.cs

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+using System;
+using System.Net.Http;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using System.Text;
+using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using IgniteUI.Blazor.Controls; // for registering Ignite UI modules
+
+namespace Infragistics.Samples
+{
+    public class Program
+    {
+        public static async Task Main(string[] args)
+        {
+            var builder = WebAssemblyHostBuilder.CreateDefault(args);
+            builder.RootComponents.Add<App>("app");
+            builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
+            // registering Ignite UI modules
+            builder.Services.AddIgniteUIBlazor(
+                typeof(IgbInputModule),
+                typeof(IgbPropertyEditorPanelModule),
+                typeof(IgbGridModule)
+            );
+            await builder.Build().RunAsync();
+        }
+    }
+}

samples/grids/grid/infinite-scroll/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:4200",
+      "sslPort": 44385
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "BlazorSamples": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "https://localhost:5001;http://localhost:4200"
+    }
+  }
+}

samples/grids/grid/infinite-scroll/ReadMe.md

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+<!-- NOTE: do not change this file because it's auto re-generated from template: -->
+<!-- https://github.com/IgniteUI/igniteui-blazor-examples/tree/vnext/templates/sample/ReadMe.md -->
+
+This folder contains implementation of Blazor application with example of Remote Paging Data feature using [Grid](https://www.infragistics.com/products/ignite-ui-blazor/blazor/components/general-getting-started.html) component.
+
+
+<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
+    <body>
+        <!-- https://static.infragistics.com/xplatform/images/browsers -->
+        <a target="_blank" href="https://www.infragistics.com/products/ignite-ui-blazor/blazor/components/general-getting-started.html" rel="noopener noreferrer">
+            <img height="40px" style="border-radius: 0rem" alt="View Docs" src="https://github.com/IgniteUI/igniteui-blazor-examples/raw/vnext/templates/sample/images/button-docs.png"/>
+        </a>
+        <a target="_blank" href="./App.razor" rel="noopener noreferrer">
+            <img height="40px" style="border-radius: 0rem; max-width: 100%;" alt="View Code" src="https://github.com/IgniteUI/igniteui-blazor-examples/raw/vnext/templates/sample/images/button-code.png"/>
+        </a>
+        <a target="_blank" href="https://infragistics.com/blazor-client/samples/grids/grid/remote-paging-data" rel="noopener noreferrer">
+            <img height="40px" style="border-radius: 0rem; max-width: 100%;" alt="Run Sample" src="https://github.com/IgniteUI/igniteui-blazor-examples/raw/vnext/templates/sample/images/button-run.png"/>
+        </a>
+        <!-- <a target="_blank" href="https://codesandbox.io/s/github/IgniteUI/igniteui-blazor-examples/tree/master/samples/grids/grid/remote-paging-data?fontsize=14&hidenavigation=1&theme=dark&view=preview&file=/src/App.razor" rel="noopener noreferrer">
+            <img height="40px" style="border-radius: 0rem; max-width: 100%;" alt="Run Sample" src="https://github.com/IgniteUI/igniteui-blazor-examples/raw/vnext/templates/sample/images/button-sandbox.png"/>
+        </a> -->
+    </body>
+</html>
+
+## Setup
+
+- instal **.NET SDK** from this [website](https://dotnet.microsoft.com/learn/aspnet/blazor-tutorial/install)
+
+
+## Running App in Visual Studio 2019
+
+NOTE: VS 2019 has better code highlighting and error detection than VS Code does.
+
+- open **Visual Studio 2019** as an administrator
+
+- open the **BlazorClientApp.sln** solution
+
+- right click solution and select **Restore NuGet Packages** menu item
+
+- click **Debug** menu and select **Start Debugging** or press **F5** key
+
+
+## Running App in VS Code
+
+- open **VS Code** as an administrator
+
+- open this folder in **VS Code**
+
+- open a terminal window
+
+- to restore assemblies, run this command:
+```dotnet restore```
+
+- to run samples, run this command:
+```dotnet watch run```
+
+- wait for for message:
+**Now listening on: http://localhost:4200**
+
+- open **http://localhost:4200** in your browser
+
+
+## Resources
+
+- [Razor Component Models](https://www.codemag.com/article/1911052)
+- [Razor Syntax](https://docs.microsoft.com/en-us/aspnet/core/blazor/components/?view=aspnetcore-3.1#razor-syntax)
+- [Getting reference to components](https://docs.microsoft.com/en-us/aspnet/core/blazor/components/?view=aspnetcore-3.1#capture-references-to-components)

samples/grids/grid/infinite-scroll/_Imports.razor

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+// these namespaces are global to the app
+@using System.Net.Http
+@using System.Net.Http.Json
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.AspNetCore.Components.Web
+@using Microsoft.AspNetCore.Components.WebAssembly.Http
+@using Microsoft.JSInterop
+@using Infragistics.Samples

samples/grids/grid/infinite-scroll/wwwroot/index.css

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+/*
+CSS styles are loaded from the shared CSS file located at:
+https://static.infragistics.com/xplatform/css/samples/
+*/

samples/grids/grid/infinite-scroll/wwwroot/index.html

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+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
+    <meta name="description" content="Explore samples of IgniteUI for Blazor components.">
+    <meta name="keywords" content="Sample, Example, Blazor, IgniteUI for Blazor, Components, Infragistics">
+    <meta name="author" content="Infragistics">
+    <title>Samples | IgniteUI for Blazor | Infragistics</title>
+    <base href="/" />
+    <link href="https://static.infragistics.com/xplatform/images/browsers/blazor.ico" rel="icon" type="image/x-icon">
+    <link href="https://static.infragistics.com/xplatform/css/samples/shared.v6.css" rel="stylesheet" />
+    <link href="https://static.infragistics.com/xplatform/css/samples/blazor.css" rel="stylesheet" />
+    <link href="_content/IgniteUI.Blazor/themes/grid/light/bootstrap.css" rel="stylesheet" />
+    <link href="index.css" rel="stylesheet" />
+</head>
+
+<body>
+    <app class="app"><img class="app-loading" src="https://static.infragistics.com/xplatform/images/browsers/loading.gif" /></app>
+    <div class="app-error-ui">
+        An unhandled error has occurred.
+        <a href="" class="reload">Reload</a>
+        <a class="app-error-dismiss">🗙</a>
+    </div>
+    <!-- importing blazor bundle for IG controls: -->
+    <script src="_content/IgniteUI.Blazor/app.bundle.js"></script>
+    <script src="_framework/blazor.webassembly.js"></script>
+</body>
+
+</html>