Let’s define the dictionary I’m using as searchBoardGames[image.Id]
The select is in a foreach loop so I can render multiple select elements because what I’m trying to do is collect data from the user for multiple entries, but using the same list of gameIds. The @foreach loop with the <select> would be something like this:
<div class="image-gallery">
@foreach (var image in images)
{
<div class="image-item">
<img src="data:image/png;base64,@Convert.ToBase64String(image.ImageData)" alt="Unknown Image" />
<div id="boardGameSelect" class="board-game-select">
@if (searchResults.ContainsKey(image.Id) && searchResults[image.Id].Any())
{
<select id="@selectInputId" @bind="searchBoardGames[image.Id]">
<option value="">-- Select a Board Game --</option>
@foreach (var game in searchResults[image.Id])
{
<option value="@game.Id">@game.Name</option>
}
</select>
}
</div>
</div>
}
</div>
So now the problem is the @bind=searchBoardGames[image.Id] isn’t going to work, but I can’t figure out how to get around this problem. I can’t add an @onchange because that’s used by @bind and I haven’t been able to construct a method that could return something because it needs to be bound to a Property, not the value of some returned variable.
4
You can use @onchange to manually handle the changes for each <select>, since @bind can’t directly bind to a dictionary key. A whole working demo you could follow:
@page "/"
@rendermode InteractiveServer
<form method="post" @onsubmit="HandleValidSubmit" @formname="TestForm">
<div class="image-gallery">
@foreach (var image in images)
{
<div class="image-item">
<img src="data:image/png;base64,@Convert.ToBase64String(image.ImageData)" alt="Unknown Image" />
<div id="boardGameSelect" class="board-game-select">
@if (searchResults.ContainsKey(image.Id) && searchResults[image.Id].Any())
{
<select id="[email protected]" value="@GetSelectedValue(image.Id)" @onchange="(e) => UpdateSelectedGame(image.Id, e.Value)">
<option value="">-- Select a Board Game --</option>
@foreach (var game in searchResults[image.Id])
{
<option value="@game.Id">@game.Name</option>
}
</select>
}
</div>
</div>
}
</div>
<button type="submit">Submit</button>
</form>
@code {
// Dictionary to hold the selected board game for each image
private Dictionary<int, string> searchBoardGames = new Dictionary<int, string>();
// List of images (you can replace this with your actual model for images)
List<ImageModel> images = new List<ImageModel>
{
new ImageModel { Id = 1, ImageData =new byte[0] }, // Sample image
new ImageModel { Id = 2, ImageData = new byte[0]} // Sample image
};
// Dictionary that stores search results for board games per image ID
private Dictionary<int, List<GameModel>> searchResults = new Dictionary<int, List<GameModel>>
{
{ 1, new List<GameModel> { new GameModel { Id = "g1", Name = "Catan" }, new GameModel { Id = "g2", Name = "Ticket to Ride" } } },
{ 2, new List<GameModel> { new GameModel { Id = "g3", Name = "Pandemic" }, new GameModel { Id = "g4", Name = "Carcassonne" } } }
};
// Method to get the selected value for the current image
private string GetSelectedValue(int imageId)
{
if (searchBoardGames.ContainsKey(imageId))
{
return searchBoardGames[imageId];
}
return "";
}
// Method to update the selected board game for an image
private void UpdateSelectedGame(int imageId, object selectedGameId)
{
if (!string.IsNullOrEmpty(selectedGameId?.ToString()))
{
searchBoardGames[imageId] = selectedGameId.ToString();
}
}
private void HandleValidSubmit()
{
// Process the selected board games
foreach (var entry in searchBoardGames)
{
Console.WriteLine($"Image {entry.Key} has selected game ID: {entry.Value}");
}
}
// Sample models
public class ImageModel
{
public int Id { get; set; }
public byte[] ImageData { get; set; }
}
public class GameModel
{
public string Id { get; set; }
public string Name { get; set; }
}
}