Blazor - show confirmation dialog before delete/update?

Blazor - show confirmation dialog before delete/update?

In a Blazor application, you can show a confirmation dialog before deleting or updating an item by using the JSRuntime class to invoke a JavaScript function that displays the dialog.

Here's an example of how to show a confirmation dialog in Blazor:

  1. In your Blazor component, add a method to show the confirmation dialog:

    private async Task<bool> ShowConfirmationDialogAsync(string message) { return await JSRuntime.InvokeAsync<bool>("confirm", message); }

    This method uses the JSRuntime.InvokeAsync method to call the confirm JavaScript function, which displays a dialog box with the specified message and returns a Boolean value indicating whether the user clicked OK or Cancel.

  2. In your Blazor component, call the ShowConfirmationDialogAsync method before deleting or updating an item:

    private async Task DeleteItemAsync(Item item) { if (await ShowConfirmationDialogAsync("Are you sure you want to delete this item?")) { // Delete the item } }

    This code calls the ShowConfirmationDialogAsync method to display a confirmation dialog with the specified message. If the user clicks OK, the code proceeds with deleting the item. If the user clicks Cancel, the code does not delete the item.

You can use a similar approach to show a confirmation dialog before updating an item. Simply call the ShowConfirmationDialogAsync method before updating the item, and proceed with the update if the user clicks OK.

Note that the JSRuntime class is used to invoke JavaScript functions in Blazor, so you need to inject it into your component before you can use it. You can inject JSRuntime by adding the following code to your component:

@inject IJSRuntime JSRuntime

This injects an instance of IJSRuntime into your component, which you can then use to invoke JavaScript functions.

Examples

  1. "Blazor confirmation dialog before delete"

    • Code Implementation:
      <button @onclick="DeleteItem">Delete</button> @code { private async Task DeleteItem() { if (await JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to delete?")) { // Perform delete logic Console.WriteLine("Item deleted!"); } }
    • Description: Utilize JavaScript interop (JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to delete?")) to display a confirmation dialog before executing the delete logic.

  2. "Blazor confirmation dialog before update"

    • Code Implementation:
      <button @onclick="UpdateItem">Update</button> @code { private async Task UpdateItem() { if (await JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to update?")) { // Perform update logic Console.WriteLine("Item updated!"); } }
    • Description: Similar to delete, use a confirmation dialog before executing the update logic to ensure user confirmation.

  3. "Blazor confirm dialog before form submission"

    • Code Implementation:
      <form @onsubmit="SubmitForm"> <!-- Form fields go here --> <button type="submit">Submit</button> </form> @code { private async Task SubmitForm() { if (!await JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to submit the form?")) { // Cancel form submission return; } // Perform form submission logic Console.WriteLine("Form submitted!"); }
    • Description: Implement a confirmation dialog before submitting a form, preventing the form from being submitted if the user cancels.

  4. "Blazor show confirmation dialog on row delete"

    • Code Implementation:
      @foreach (var item in items) { <div> <span>@item.Name</span> <button @onclick="() => DeleteItem(item)">Delete</button> </div> } @code { private async Task DeleteItem(ItemModel item) { if (await JSRuntime.InvokeAsync<bool>("confirm", $"Are you sure you want to delete {item.Name}?")) { // Perform delete logic Console.WriteLine($"{item.Name} deleted!"); } }
    • Description: Display a confirmation dialog when deleting a specific item in a list or grid.

  5. "Blazor confirmation modal before delete"

    • Code Implementation:
      <button @onclick="ShowDeleteConfirmation">Delete</button> <ConfirmationModal @ref="deleteConfirmationModal" /> @code { private ConfirmationModal deleteConfirmationModal; private async Task ShowDeleteConfirmation() { if (await deleteConfirmationModal.Show("Are you sure you want to delete?")) { // Perform delete logic Console.WriteLine("Item deleted!"); } }
    • Description: Use a reusable confirmation modal component to encapsulate the confirmation dialog logic for delete operations.

  6. "Blazor confirmation dialog with custom messages"

    • Code Implementation:
      <button @onclick="ShowCustomConfirmation">Delete</button> @code { private async Task ShowCustomConfirmation() { string customMessage = "This action is irreversible. Do you really want to proceed?"; if (await JSRuntime.InvokeAsync<bool>("confirm", customMessage)) { // Perform delete logic Console.WriteLine("Item deleted!"); } }
    • Description: Customize the confirmation message displayed in the dialog by passing a custom message string.

  7. "Blazor confirmation dialog with parameters"

    • Code Implementation:
      <button @onclick="() => ShowConfirmation("Are you sure you want to delete?", DeleteItem)">Delete</button> @code { private async Task ShowConfirmation(string message, Func<Task> action) { if (await JSRuntime.InvokeAsync<bool>("confirm", message)) { await action.Invoke(); } } private async Task DeleteItem() { // Perform delete logic Console.WriteLine("Item deleted!"); }
    • Description: Create a generic method to show a confirmation dialog with dynamic messages and actions, allowing reusability.

  8. "Blazor confirmation dialog with callback"

    • Code Implementation:
      <button @onclick="() => ShowConfirmation("Are you sure you want to delete?", DeleteItem)">Delete</button> @code { private async Task ShowConfirmation(string message, Func<Task> callback) { if (await JSRuntime.InvokeAsync<bool>("confirm", message)) { await callback.Invoke(); } } private async Task DeleteItem() { // Perform delete logic Console.WriteLine("Item deleted!"); }
    • Description: Use a callback function to handle the confirmation dialog result and execute the corresponding action if the user confirms.

  9. "Blazor confirmation dialog before navigation"

    • Code Implementation:
      <NavLink @onclick="NavigateWithConfirmation" href="/destination">Go to Destination</NavLink> @code { private async Task NavigateWithConfirmation(MouseEventArgs e) { if (!await JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to navigate to the destination?")) { e.PreventDefault(); } }
    • Description: Display a confirmation dialog before navigating to another page, preventing the navigation if the user cancels.

  10. "Blazor confirmation dialog with multiple buttons"

    • Code Implementation:
      <button @onclick="() => ShowConfirmation("Choose an action", new List<string> { "Delete", "Archive" }, HandleAction)">Perform Action</button> @code { private async Task ShowConfirmation(string message, List<string> options, Func<string, Task> action) { string selectedOption = await JSRuntime.InvokeAsync<string>("showCustomConfirm", message, options); if (!string.IsNullOrEmpty(selectedOption)) { await action.Invoke(selectedOption); } } private async Task HandleAction(string selectedOption) { // Perform action based on the selected option Console.WriteLine($"{selectedOption} action performed!"); }
    • Description: Extend the confirmation dialog to display multiple buttons with different actions, allowing the user to choose the desired action.

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