我有一个 ASP.NET Core 3.1 Razor Pages 和 MVC 应用程序。 页面只有一个表单的时候很简单,但是表单很少的时候如何正确显示错误呢?
示例: /管理用户.cshtml
<div>
<form method="post">
<div class="validation-summary-valid text-danger" asp-validation-summary="All"></div>
<div class="form-group">
<label asp-for="OldPassword"></label>
<input asp-for="OldPassword" class="form-control" />
</div>
<div class="form-group">
<label asp-for="NewPassword1"></label>
<input asp-for="NewPassword1" class="form-control" />
</div>
<div class="form-group">
<label asp-for="NewPassword2"></label>
<input asp-for="NewPassword2" class="form-control" />
</div>
<button type="submit" class="btn btn-primary" asp-page-handler="ChangePassword">Change password</button>
</form>
</div>
<!-- let's say it is the other "tab" -->
<div>
<form method="post">
<div class="validation-summary-valid text-danger" asp-validation-summary="All"></div>
<div class="form-group">
<label asp-for="ChangeEmail"></label>
<input asp-for="ChangeEmail" class="form-control" />
</div>
<button type="submit" class="btn btn-primary" asp-page-handler="ChangeEmail">Change email</button>
</form>
</div>
并且,如果在后端发现任何错误:
public async Task<IActionResult> OnPostChangeEmailAsync([FromService] UserManager<User> userManager)
{
//... skipped for brevity
ModelState.AddModelError("", "User not found or deleted");
return Page();
}
然后两种形式都会显示此错误。有什么办法只显示相应的表格吗?
PS:请不要建议将错误字段绑定:事实并非如此,示例中的字段只是为了简单起见。
以字段验证为例,您可以尝试以下代码。
查看:
<div>
<form method="post">
<span class="text-danger">@Html.ValidationMessage("PasswordError")</span>
<div class="form-group">
<label asp-for="UserModel.OldPassword"></label>
<input asp-for="UserModel.OldPassword" class="form-control" />
<span asp-validation-for="UserModel.OldPassword" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="UserModel.NewPassword1"></label>
<input asp-for="UserModel.NewPassword1" class="form-control" />
<span asp-validation-for="UserModel.NewPassword1" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="UserModel.NewPassword2"></label>
<input asp-for="UserModel.NewPassword2" class="form-control" />
<span asp-validation-for="UserModel.NewPassword2" class="text-danger"></span>
</div>
<button type="submit" class="btn btn-primary" asp-page-handler="ChangePassword">Change password</button>
</form>
</div>
<div>
<form method="post">
<span class="text-danger">@Html.ValidationMessage("EmailError")</span>
<div class="form-group">
<label asp-for="UserModel.ChangeEmail"></label>
<input asp-for="UserModel.ChangeEmail" class="form-control" />
<span asp-validation-for="UserModel.ChangeEmail" class="text-danger"></span>
</div>
<button type="submit" class="btn btn-primary" asp-page-handler="ChangeEmail">Change email</button>
</form>
</div>
后端(可以去掉属性):
public async Task<IActionResult> OnPostChangeEmailAsync(UserModel userModel)
{
if (!ModelState.IsValid)
{
ModelState.Remove("UserModel.OldPassword");
ModelState.Remove("UserModel.NewPassword1");
ModelState.Remove("UserModel.NewPassword2");
ModelState.AddModelError("EmailError", "User not found or deleted");
}
return Page();
}
public async Task<IActionResult> OnPostChangePassword(UserModel userModel)
{
if (!ModelState.IsValid)
{
ModelState.Remove("UserModel.ChangeEmail");
ModelState.AddModelError("PasswordError", "Password is inconsistent ");
}
return Page();
}