|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics.CodeAnalysis;
using Microsoft.AspNetCore.Components.Rendering;
namespace Microsoft.AspNetCore.Components.Forms;
/* This is almost equivalent to a .razor file containing:
*
* @inherits InputBase<string>
* <input @bind="CurrentValue" id="@Id" class="@CssClass" />
*
* The only reason it's not implemented as a .razor file is that we don't presently have the ability to compile those
* files within this project. Developers building their own input components should use Razor syntax.
*/
/// <summary>
/// An input component for editing <see cref="string"/> values.
/// </summary>
public class InputText : InputBase<string?>
{
/// <summary>
/// Gets or sets the associated <see cref="ElementReference"/>.
/// <para>
/// May be <see langword="null"/> if accessed before the component is rendered.
/// </para>
/// </summary>
[DisallowNull] public ElementReference? Element { get; protected set; }
/// <inheritdoc />
protected override void BuildRenderTree(RenderTreeBuilder builder)
{
builder.OpenElement(0, "input");
builder.AddMultipleAttributes(1, AdditionalAttributes);
builder.AddAttributeIfNotNullOrEmpty(2, "name", NameAttributeValue);
builder.AddAttributeIfNotNullOrEmpty(3, "class", CssClass);
builder.AddAttribute(4, "value", CurrentValueAsString);
builder.AddAttribute(5, "onchange", EventCallback.Factory.CreateBinder<string?>(this, __value => CurrentValueAsString = __value, CurrentValueAsString));
builder.SetUpdatesAttributeName("value");
builder.AddElementReferenceCapture(6, __inputReference => Element = __inputReference);
builder.CloseElement();
}
/// <inheritdoc />
protected override bool TryParseValueFromString(string? value, out string? result, [NotNullWhen(false)] out string? validationErrorMessage)
{
result = value;
validationErrorMessage = null;
return true;
}
}
|