How to make two-way binding on Blazor component in C#

How to make two-way binding on Blazor component in C#

To make two-way binding on a Blazor component in C#, you can use the @bind directive along with a variable that is used to store the value of the input element. Here's an example:

<input type="text" @bind="Name" />

@code {
    private string Name { get; set; }
}

In the above example, the @bind directive is used to bind the value of the input element to the Name variable. Any changes made to the input element will automatically update the Name variable, and any changes made to the Name variable will automatically update the input element.

You can also specify the event that triggers the update of the variable by using the @bind:event directive. For example, to update the variable when the input element loses focus, you can use the following code:

<input type="text" @bind-value="@Name" @bind:event="onblur" />

@code {
    private string Name { get; set; }
}

In this example, the @bind-value directive is used to bind the value of the input element to the Name variable, and the @bind:event directive is used to specify that the update should occur when the onblur event is triggered.

Examples

  1. "Blazor two-way binding example"

    • Description: Learn the basics of implementing two-way binding in a Blazor component using the bind directive.
    <!-- Code Snippet -->
<input @bind="UserName" />
@code {
    private string UserName { get; set; }
}

  2. "Blazor two-way binding with input components"

    • Description: Explore how to use two-way binding with Blazor input components like InputText for more advanced scenarios.
    <!-- Code Snippet -->
<InputText @bind-Value="UserName" />
@code {
    private string UserName { get; set; }
}

  3. "Blazor two-way binding with select dropdown"

    • Description: Understand how to implement two-way binding with a select dropdown in Blazor.
    <!-- Code Snippet -->
<select @bind="SelectedOption">
    <option value="Option1">Option 1</option>
    <option value="Option2">Option 2</option>
</select>
@code {
    private string SelectedOption { get; set; }
}

  4. "Blazor two-way binding with checkbox"

    • Description: Learn how to use two-way binding with a checkbox in a Blazor component.
    <!-- Code Snippet -->
<input type="checkbox" @bind="IsChecked" />
@code {
    private bool IsChecked { get; set; }
}

  5. "Blazor two-way binding with custom components"

    • Description: Explore how to implement two-way binding in custom Blazor components.
    <!-- Code Snippet -->
<CustomComponent @bind-Value="CustomValue" />
@code {
    private string CustomValue { get; set; }
}

  6. "Blazor two-way binding with complex objects"

    • Description: Understand how to perform two-way binding with complex objects or models in a Blazor component.
    <!-- Code Snippet -->
<input @bind="User.Name" />
@code {
    private UserModel User { get; set; } = new UserModel();
}

  7. "Blazor two-way binding validation"

    • Description: Learn how to implement two-way binding with validation in a Blazor component.
    <!-- Code Snippet -->
<InputText @bind-Value="UserName" />
<ValidationMessage For="@(() => UserName)" />
@code {
    private string UserName { get; set; }
}

  8. "Blazor two-way binding event handling"

    • Description: Explore how to handle events while using two-way binding in a Blazor component.
    <!-- Code Snippet -->
<input @bind="UserName" @oninput="HandleInput" />
@code {
    private string UserName { get; set; }

    private void HandleInput(ChangeEventArgs e)
    {
        UserName = e.Value.ToString();
        // Additional logic if needed
    }
}

  9. "Blazor two-way binding with debounce"

    • Description: Learn how to add a debounce effect to two-way binding in a Blazor component for improved performance.
    <!-- Code Snippet -->
<input @bind="UserName" @oninput="HandleInput" />
@code {
    private string UserName { get; set; }

    private async Task HandleInput(ChangeEventArgs e)
    {
        await Task.Delay(300); // Debounce time
        UserName = e.Value.ToString();
    }
}

  10. "Blazor two-way binding with external data source"

    • Description: Understand how to perform two-way binding with data fetched from an external source in a Blazor component.
    <!-- Code Snippet -->
<InputText @bind-Value="ExternalValue" />
@code {
    private string ExternalValue { get; set; }

    // Fetch and set ExternalValue from an external data source
}

More Tags

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