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 isCheckbox = Model.Type == "checkbox";
	var errors = isInvalid ? ViewContext.ModelState[Model.Name].Errors : null;
}
@if (Model.Type == "hidden")
{
    <input id="@Model.Name" type="@Model.Type" name="@Model.Name" value="@Model.Value" />
    return;
}
<div class="form-@(isCheckbox ? "check" : "group")">
    @if (isCheckbox)
    {
        <input id="@Model.Name" type="@Model.Type" class="form-check-input @(errors is null ? "" : "is-invalid")"
               name="@Model.Name" value="true" data-val="true" readonly="@Model.Constant"
               @if (Model.Value == "true")
               {
                   @Safe.Raw(" checked")
               }
               @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")
               } />
        <label class="form-check-label" for="@Model.Name"@(Model.Required ? " data-required" : "")>
            @Safe.Raw(Model.Label)
        </label>
    }
    else
    {
        <label class="form-label" for="@Model.Name"@(Model.Required ? " data-required" : "")>
            @Safe.Raw(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" readonly="@Model.Constant"
               @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">
            @Safe.Raw(Model.HelpText)
        </div>
    }
</div>