Data Binding in Blazor TextBox component

This section briefly explains how to bind the value to the TextBox component in the following different ways.

• One-way data binding
• Two-way data binding
• Dynamic value binding

One-way binding

You can bind the value to the TextBox component directly for Value property as mentioned in the following code example. In one-way binding, you have to pass property or variable name along with @ (For Ex: “@Name”).

@using Syncfusion.Blazor.Inputs

<SfTextBox Value="@Name"></SfTextBox>

<button @onclick="@UpdateValue">Update Value</button>

@code {

public string Name { get; set; } = "Hello, World!";

    public void UpdateValue()
    {
        Name = "Hello, Blazor!";
    }
}

Two-way data binding

Two-way binding can be achieved by using bind-Value attribute and its supports string, int, Enum, DateTime, and bool types. If component value has been changed, it will affect the all places where you bind the variable for the bind-value attribute.

@using Syncfusion.Blazor.Inputs

<p>TextBox value is: @Name</p>

<SfTextBox @bind-Value="@Name"></SfTextBox>

@code {

public string Name { get; set; } = "Syncfusion";

}

Dynamic value binding

You can change the property value dynamically by manually calling the StateHasChanged() method inside public event of Blazor TextBox component only. This method notifies the component that its state has changed and queues a re-render.

There is no need to call this method for native events since it’s called after any lifecycle method has been called and can also be invoked manually to trigger a re-render. Refer to the following code example.

@using Syncfusion.Blazor.Inputs

<SfTextBox Placeholder="Enter a Numeric Values" Input="OnInput" CssClass="@CssClass"></SfTextBox>

@code {

    public string CssClass { get; set; }

    public void OnInput(InputEventArgs args)
    {
        if (!System.Text.RegularExpressions.Regex.IsMatch(args.Value, "^[0-9]*$")){
            CssClass = "e-error";
        }
        else {
            CssClass = "e-success";
        }
        this.StateHasChanged();
    }
}