Hi everyone,
I'm working on a Blazor Server project and I need to update the state of one component whenever another component changes. I'm looking for the best approach to achieve this. Should I use cascading parameters, state containers, or events to trigger updates between components?
Any guidance, examples, or best practices would be greatly appreciated!
Thank you in advance!
Top comments (2)
This should put some light on how fo so using just Blazor jonhilton.net/blazor-rendering/
Also if you are familiar with Flux pattern (unidirectional data flow used in many SPA frameworks/libs) I would suggest also having a look at managing state using Fluxor code-maze.com/fluxor-for-state-man...
In Blazor Server, updating one component's state based on changes in another component can be achieved through shared state and event callbacks. Here's a step-by-step guide to achieve this:
Create a service to hold the shared state between components. This service will notify components when the state changes.
Example:
public class StateService
{
public event Action? StateChanged;
}
Register the service as a singleton in the dependency injection container.
builder.Services.AddSingleton();
Inject the StateService into the components that need to share the state.
Component A (Updates the State):
@inject StateService StateService
Component B (Responds to State Change):
@inject StateService StateService
Updated Data: @SharedData
@code {
private string SharedData = string.Empty;
}
For simpler cases, you can use cascading values to share state between components without a service.
Example:
In a parent component:
@code {
private string SharedData = "Initial Data";
}
In ComponentA and ComponentB:
[CascadingParameter(Name = "SharedState")]
public string SharedData { get; set; }
Summary
Shared Service is the best approach for managing shared state and triggering updates across unrelated components.
Cascading Parameters are simpler but suitable for parent-child relationships.
Always manage event subscriptions to avoid memory leaks in Blazor Server applications.