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provide possibility to override expression used for validation #272

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provide possibility to override expression used for validation #272

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18 changes: 12 additions & 6 deletions src/MatBlazor/Components/Base/BaseMatInputComponent.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Forms;
using System;
using System.Collections.Generic;
Expand Down Expand Up @@ -80,7 +80,13 @@ protected void NotifyFieldChanged()
/// Gets or sets an expression that identifies the bound value.
/// </summary>
[Parameter]
public Expression<Func<T>> ValueExpression { get; set; }
public Expression<Func<T>> ValueExpression { get; set; }

/// <summary>
/// Gets or sets an expression that identifies the bound value to validate.
/// </summary>
[Parameter]
public Expression<Func<T>> ValidateValueExpression { get; set; }

/// <inheritdoc />
public override Task SetParametersAsync(ParameterView parameters)
Expand All @@ -97,13 +103,13 @@ public override Task SetParametersAsync(ParameterView parameters)
EditContext = CascadedEditContext;
if (EditContext != null)
{
if (ValueExpression == null)
if (ValueExpression == null && ValidateValueExpression == null)
{
throw new InvalidOperationException($"{GetType()} requires a value for the 'ValueExpression' " +
throw new InvalidOperationException($"{GetType()} requires a value for the 'ValueExpression'" +
$"parameter. Normally this is provided automatically when using 'bind-Value'.");
}

FieldIdentifier = FieldIdentifier.Create(ValueExpression);
FieldIdentifier = FieldIdentifier.Create(ValidateValueExpression ?? ValueExpression);
}

_hasSetInitialEditContext = true;
Expand All @@ -124,4 +130,4 @@ public override Task SetParametersAsync(ParameterView parameters)
return base.SetParametersAsync(ParameterView.Empty);
}
}
}
}