« Blazor component » : différence entre les versions
De Banane Atomic
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Aucun résumé des modifications |
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= [https://docs.microsoft.com/en-us/aspnet/core/blazor/components/cascading-values-and-parameters?view=aspnetcore-5.0 Cascading values and parameters] = | = [https://docs.microsoft.com/en-us/aspnet/core/blazor/components/cascading-values-and-parameters?view=aspnetcore-5.0 Cascading values and parameters] = | ||
Set a value for the component hierarchy from an ancestor component to any number of descendent components. | |||
<filebox fn='Pages/Index.razor'> | |||
<CascadingValue Value="btnStyle"> | |||
<MyComponent /> | |||
</CascadingValue> | |||
@code { | |||
string BtnStyle = "btn-success"; | |||
} | |||
</filebox> | |||
<filebox fn='Components/MyComponent.razor.cs'> | |||
[CascadingParameter] | |||
public string BtnStyle { get; set; } | |||
</filebox> | |||
Version du 25 juillet 2021 à 15:41
Basic component
| Components/MyComponent.razor |
<h1>Test</h1> <p>@ChildContent</p> |
| Components/MyComponent.razor.cs |
public partial class MyComponent : ComponentBase
{
[Parameter]
public RenderFragment ChildContent { get; set; }
}
|
| Components/MyComponent.razor.css |
h1 {
color: coral;
}
|
| Pages/Index.razor |
@page "/"
@using Component.Components
<MyComponent>
test !!!
</MyComponent>
|
Callback event
| Components/MyComponent.razor.cs |
[Parameter]
public EventCallback<string> Callback { get; set; }
private string description;
private async Task UpdateDescription()
{
await Callback.InvokeAsync(description);
}
|
| Pages/Index.razor |
<MyComponent Callback="MyComponentCallback" />
@code {
void MyComponentCallback(string description)
{
}
}
|
Binding with component parameters
| Components/MyComponent.razor.cs |
[Parameter]
public string Description { get; set; }
// name of the EventCallback has to be [PropertyName]Changed
[Parameter]
public EventCallback<string> DescriptionChanged { get; set; }
private async Task UpdateDescription()
{
await DescriptionChanged.InvokeAsync(description);
}
|
| Pages/Index.razor |
@* two ways binding of the component parameter Description with the local field description *@
<MyComponent @bind-Description="description" />
@code {
private string description = "Text";
}
|
Cascading values and parameters
Set a value for the component hierarchy from an ancestor component to any number of descendent components.
| Pages/Index.razor |
<CascadingValue Value="btnStyle">
<MyComponent />
</CascadingValue>
@code {
string BtnStyle = "btn-success";
}
|
| Components/MyComponent.razor.cs |
[CascadingParameter]
public string BtnStyle { get; set; }
|
