[英]ASP.NET Core 6 MVC - EF Core 6 - model is not validating correctly
[英]Validating two attributes at once in ASP.NET Core MVC
我有以下視圖模型;
public class MyViewModel {
[Required(ErrorMessage = "Location is required")]
[Range(SOME_RANDOM_COORDINATE, SOME_RANDOM_COORDINATE, ErrorMessage = "Keep location within map bounds")]
public double? Latitude { get; set; }
[Required(ErrorMessage = "Location is required")]
[Range(SOME_RANDOM_COORDINATE, SOME_RANDOM_COORDINATE, ErrorMessage = "Keep location within map bounds")]
public double? Longitude { get; set; }
}
我使用 OpenStreetMap 作為這些緯度和經度值的輸入,並且我想使用 ViewModel 中的屬性添加客戶端和服務器端驗證。 我正在創建兩個 html 輸入字段(均隱藏)。 提交表單(而不是設置位置)時,我自然會得到兩次“需要位置”。 如何將這兩個屬性分組在一起進行驗證?
看法;
<form asp-area="" asp-controller="Report" asp-action="Create" method="post" enctype="multipart/form-data">
<h4>@ViewData["Title"]</h4>
<hr />
<div class="form-group">
<input id="latitude" type="hidden" asp-for="@Model.Latitude" class="form-control" />
<span asp-validation-for="@Model.Latitude" class="text-danger"></span>
</div>
<div class="form-group">
<input id="longitude" type="hidden" asp-for="@Model.Longitude" class="form-control" />
<span asp-validation-for="@Model.Longitude" class="text-danger"></span>
</div>
</form>
您可以嘗試使用自定義屬性來驗證坐標對。
在您的 model 中,我將刪除 [Required] 屬性並將其替換為自定義驗證屬性。 這些值可以在 model 中設置為默認值,以便初始視圖最初不會引發錯誤。 然后,您的 controller 可以在渲染視圖后將坐標覆蓋到您想要的任何位置。
public class MyCoordinateModel {
[Range(SOME_RANDOM_COORDINATE, SOME_RANDOM_COORDINATE, ErrorMessage = "Keep location within map bounds")]
[CustomCoordinate("Longitude", ErrorMessage = "{0} field has not been set.")]
public double? Latitude { get; set; }
[Range(SOME_RANDOM_COORDINATE, SOME_RANDOM_COORDINATE, ErrorMessage = "Keep location within map bounds")]
[CustomCoordinate("Latitude", ErrorMessage = "{0} field has not been set.")]
public double? Longitude { get; set; }
MyCoordinateModel()
{
Longitude = 0;
Latitude = 0;
}
}
自定義屬性將是這樣的,錯誤消息有條件地顯示並自定義無效的屬性:
[AttributeUsage(AttributeTargets.Property |
AttributeTargets.Field, AllowMultiple = false)]
public class CustomCoordinateAttribute : ValidationAttribute
{
private readonly string _requiredProperty;
public CustomCoordinateAttribute(public double? requiredValue)
{
_requiredProperty = requiredValue;
}
protected override ValidationResult IsValid(object value,
ValidationContext validationContext)
{
var currentValue = (double)value;
var property =
validationContext.ObjectType.GetProperty(_requiredProperty);
if (property == null)
throw new ArgumentException("Specified property name not found");
var otherValue =
(DateTime)property.GetValue(validationContext.ObjectInstance);
if ((currentValue == null) || (otherValue == null))
{
return new ValidationResult("None of the coordinates are defined");
}
if ((currentValue == null) && (otherValue != null))
{
return new ValidationResult(String.Format(
ErrorMessageString, currentValue));
}
if ((currentValue != null) && (otherValue == null))
{
return new ValidationResult(String.Format(
ErrorMessageString, otherValue);
}
if ((currentValue < 0) || (otherValue < 0))
{
return new ValidationResult("Coordinates cannot be negative");
}
return ValidationResult.Success;
}
}
您可以在提交表單之前使用 ajax 進行驗證,這是一個演示:
行動:
public IActionResult Verify(double? Latitude,double? Longitude)
{
if (Latitude==null||Longitude==null)
{
return Json("Location is required");
}
return Json(true);
}
我的視圖模型:
public class MyViewModel {
[Range(SOME_RANDOM_COORDINATE, SOME_RANDOM_COORDINATE, ErrorMessage = "Keep location within map bounds")]
public double? Latitude { get; set; }
[Range(SOME_RANDOM_COORDINATE, SOME_RANDOM_COORDINATE, ErrorMessage = "Keep location within map bounds")]
public double? Longitude { get; set; }
}
看法:
<form asp-area="" asp-controller="Report" asp-action="Create" method="post" enctype="multipart/form-data">
<h4>@ViewData["Title"]</h4>
<hr />
<div class="form-group">
<input id="latitude" hidden asp-for="Latitude" class="form-control" value="1"/>
<span asp-validation-for="Latitude" class="text-danger"></span>
</div>
<div class="form-group">
<input id="longitude" hidden asp-for="Longitude" class="form-control"/>
<span asp-validation-for="Longitude" class="text-danger"></span>
</div>
<div>
<span class="text-danger field-validation-error" id="error"></span>
</div>
<button>submit</button>
</form>
@section Scripts {
@{ await Html.RenderPartialAsync("_ValidationScriptsPartial"); }
<script>
$("form").submit(function (e) {
$.ajax({
type: "GET",
url: 'Verify?Latitude=' + $("#latitude").val() + '&Longitude=' + $("#longitude").val(),
success: function (data) {
if (data != "valid") {
$("#error").html(data);
} else {
$('form').unbind().submit();
}
}
})
return false;
})
</script>
}
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