How do I add a delay to an event (OnInput) in Blazor?
Use the System.Timers.Timer class to wait until the user has finished typing in the text field. The onkeyup event triggers for each key press and resets the timer until the last timer raises the OnUserFinish event. [Index.razor] View Sample in GitHub
How do I animate state transitions in Blazor?
In the following example, we’ve animated state transitions using CSS in a Blazor app. When the state is changed, adding and removing the property values for every state transition is animated. Create a separate reusable component (.razor) in the Pages folder and add the animation. [Pages/AnimeState.razor] Add the AnimeState.razor component and define the property value to be animated when the state has been changed. [Index.razor] View Sample in GitHub
How do I save and load data within a component in Blazor?
By utilizing browser storage in Blazor, you can effectively save and load data within a component. In the following example, you can see how the counter value is updated with a button click and the count value is stored in the local storage of the browser. When you refresh the page, the saved data will be loaded from the browser’s local storage. [Index.razor] Refer to this link for more details.
On Trying to Debug an application, by the F5 key I get the error: ‘Error while trying to run project: Unable to start debugging on the web server. Catastrophic failure’
This issue occurs if the account that is used to run the ASP.NET Worker process (by default, the ASPNET user account) is not assigned the ‘Impersonate a client after authentication’ user right in the ‘Local Security Policy’ settings. This issue may occur when you install Microsoft Visual Studio .NET after you install Windows 2000 Service Pack 4 (SP4) on the computer. In this situation, the ASPNET account is not assigned the ‘Impersonate a client after authentication’ user right in the ‘Local Security Policy’ settings.To resolve it, please use the method at: To work around the problem, manually assign Impersonate a client after authentication to the IWAM account. To do so, follow these steps: Click Start, point to Programs, point to Administrative Tools, and then click Domain Controller Security Policy. Click Security Settings. Click Local Policies, and then click User Rights Assignment. In the right pane, double-click Impersonate a client after authentication. In the Security Policy Setting window, click Define these policy settings. Click Add, and then click Browse. In the Select Users or Groups window, select the IWAM account name, click Add, and then click OK. Click OK, and then click OK again. To enforce an update of computer policy, type the following command: secedit /refreshpolicy machine_policy /enforce At a command prompt, type iisreset.In case your server is a Domain Controller Refer PRB: ‘Catastrophic Failure’ Error Message When You Try to Debug an ASP.NET Application on Windows 2000 Domain Controller
How do I use IndexedDB in Blazor WebAssembly?
IndexedDB is used for the client-side storage of data and files. Follow these steps to use IndexedDB in Blazor WebAssembly: Create a Blazor WebAssembly app and install the IndexedDB.Blazor NuGet package using the NuGet package manager. Set up the IIndexedDbFactory configuration service in your Program.cs file and set it as scoped.[Program.cs] using IndexedDB.Blazor;builder.Services.AddScoped(); Now add the properties inside the class to store and process data in the Data folder.[IndexDb.cs] using IndexedDB.Blazor; using Microsoft.JSInterop; using System.ComponentModel.DataAnnotations;namespace Blazor_WebAssembly_App.Data { public class IndexDb : IndexedDb { public IndexDb ( IJSRuntime jSRuntime, string name, int version ) : base(jSRuntime, name, version) { } // These are like tables. Declare as many of them as you want. public IndexedSet employee { get; set; } } public class Employee { [Key] public int Id { get; set; } [Required] public string? FirstName { get; set; } [Required] public string? LastName { get; set; } }} Add the namespace for the IndexedDB in _Import.razor file.[_Import.razor] @using IndexedDB.Blazor @using {{Your_App_Name}}.Data Add the Razor component to add and store the data using IndexedDB in the Index.razor file.[_Import.razor] @page “/” @inject IIndexedDbFactory DbFactory <h1>employee</h1> @if (employee != null){ <table class=”table”> <thead> <tr> <th>ID</th> <th>First name</th> <th>Last name</th> <th></th> </tr> </thead> <tbody> @foreach (var Employee in employee) { <tr> <td>@Employee.Id</td> <td>@Employee.FirstName</td> <td>@Employee.LastName</td> <td> <button class=”btn btn-danger” @onclick=”() => DeleteEmployee(Employee.Id)”>Delete</button> </td> </tr> } </tbody> </table>}<fieldset> <legend>Add new Employee</legend> <EditForm Model=”@newEmployee” OnValidSubmit=”@SaveNewEmployee”> <InputText @bind-Value=”@newEmployee.FirstName” placeholder=”First name…” /> <InputText @bind-Value=”@newEmployee.LastName” placeholder=”Last name…” /> <button type=”submit”>Add</button> <p><ValidationSummary /></p> <DataAnnotationsValidator /> </EditForm></fieldset>@code { List<Employee>? employee; protected override async Task OnInitializedAsync () { await RefreshEmployeeList(); } Employee newEmployee = new Employee(); async Task RefreshEmployeeList () { using var db = await DbFactory.Create<IndexDb>(); employee = db.employee.ToList(); } async Task SaveNewEmployee () { using var db = await this.DbFactory.Create(); db.employee.Add(newEmployee); await db.SaveChanges(); // Refresh list and reset the form newEmployee = new Employee(); await RefreshEmployeeList(); } async Task DeleteEmployee ( int id ) { using var db = await this.DbFactory.Create<IndexDb>(); var employeeToDelete = db.employee.FirstOrDefault(e => e.Id == id); if (employeeToDelete != null) { db.employee.Remove(employeeToDelete); await db.SaveChanges(); await RefreshEmployeeList(); } }} View Sample in GitHub
