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BlazorX.NavigationState

BlazorX.NavigationState provides a set of utilities that allow you to observe and bind query strings to Blazor components.

Getting Started

Add the package BlazorX.NavigationState to your Blazor project.
Register BlazorX.NavigationState with your host builder as follows:
```
builder.Services.AddNavigationState();
```
Add the namespace BlazorX.NavigationState to your _Imports.razor.

Query Property

You can use the method QueryProperty on NavigationState to create an object
that will track a given query string parameter. With this object you can bind
to controls just like a normal value.

In the below example, anything the user types in the input will be reflected in
the URL (eg. http://localhost/?name=Diego) and vice-versa.

@inject INavigationState NavigationState

<input type="text" @bind-Value="Name.Value" />

@code {
   IQueryParameter<string> Name;
   
   protected override void OnInitialized() 
   {
       Name = NavigationState.QueryProperty("name", "");
   }
}

Query Array

The QueryArray class deals with query strings that can appear multiple
times in the URL. It’s useful to deal with collection of things.

@inject INavigationState NavigationState

<ul>
@foreach (var item in Numbers.Value) 
{
   <li>@item</li>
}
</ul>


@code {
   IQueryParameter<int> Numbers;
   
   protected override void OnInitialized() 
   {
       Numbers = NavigationState.QueryArray("numbers", new int[0]);
   }
}

Observable

Both QueryProperty and QueryArray supports observables via the property ValueStream:

@inject INavigationState NavigationState

@Sum
<button @onclick="@(() => Number.Value += 1)">Increment</button> 

@code {
   IQueryParameter<int> Number;
   int Sum;
   
   protected override void OnInitialized() 
   {
       Number = NavigationState.QueryProperty("n", 0);
       
       Number.ValueStream.Subscribe(x => 
       {
           Sum += x;
           StateChanged();
       });
   }
}