btcpayserver/BTCPayServer/Views/Shared/Forms/InputElement.cshtml

@model BTCPayServer.Abstractions.Form.Field
@{
	var isInvalid = ViewContext.ModelState[Model.Name]?.ValidationState is Microsoft.AspNetCore.Mvc.ModelBinding.ModelValidationState.Invalid;
	var errors = isInvalid ? ViewContext.ModelState[Model.Name].Errors : null;
}
<div class="form-group">
    <label class="form-label" for="@Model.Name"@(Model.Required ? " data-required" : "")>
        @Model.Label
    </label>
    <input id="@Model.Name" type="@Model.Type" class="form-control @(errors is null ? "" : "is-invalid")"
           name="@Model.Name" value="@Model.Value" data-val="true"
           @if (!string.IsNullOrEmpty(Model.HelpText))
           {
               @Safe.Raw($" aria-describedby=\"HelpText-{Model.Name}\"")
           }
           @if (Model.Required)
           {
               @Safe.Raw($" data-val-required=\"{Model.Label} is required.\" required")
           }
    />
    <span class="text-danger" data-valmsg-for="@Model.Name" data-valmsg-replace="true">@(isInvalid && errors.Any() ? errors.First().ErrorMessage : string.Empty)</span>
    @if (!string.IsNullOrEmpty(Model.HelpText))
    {
        <div id="@($"HelpText-{Model.Name}")" class="form-text">@Model.HelpText</div>
    }
</div>