如何解决在asp.net核心MVC中的部分视图上显示验证消息
我有以下模型以便在多选列表上显示验证
using Microsoft.AspNetCore.Mvc.Rendering;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
namespace AccountManagementUI.Models
{
public class NewMembersAddViewModel
{
public string GroupId { get; set; }
public string GroupName { get; set; }
public List<SelectListItem> membersList { get; set; }
[Required(ErrorMessage ="Please select atlast 1 employee")]
public List<Guid> selectedMembersId { get; set; }
}
}
我的控制器发布方法如下：
[HttpPost]
public IActionResult GetNewMembers(NewMembersAddViewModel groupMemberData)
{
if (ModelState.IsValid)
{
AddMembersToGroup addMembersToGroup = new AddMembersToGroup();
addMembersToGroup.GroupId = groupMemberData.GroupId;
foreach (var memberId in groupMemberData.selectedMembersId)
{
addMembersToGroup.UserIds.Add(memberId.ToString());
}
_gateway.AddMembersToGroup(addMembersToGroup);
return RedirectToAction("GroupMembers","Group",new { groupId = groupMemberData.GroupId });
}
else
{
return PartialView("_GetNewMembers",groupMemberData);
}
}
我的看法如下：
@model AccountManagementUI.Models.NewMembersAddViewModel
<!DOCTYPE html>
<html lang='en'>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Active Directory Management Portal</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<meta name="description" content="" />
<meta name="keywords" content="" />
<!-- Latest compiled and minified CSS -->
<!-- Pagelevel Initializations Of Plugins -->
</head>
<body>
<form class="console-panel grid-stack-item-content" asp-action="GetNewMembers" asp-controller="Group" method="post">
<input type="hidden" asp-for="GroupId" />
<input type="hidden" asp-for="GroupName" />
<div class="console-panel-body pl-0 pr-0">
<div class="console-form-body ">
<div class="row">
<div class="col-lg-12 col-md-12">
<div class="form-group row">
<label class="col-2 col-form-label">Members</label>
<div class="col-10">
<select asp-for="selectedMembersId" asp-items="Model.membersList" multiple="multiple" placeholder="Select Members" onchange="console.log($(this).children(':selected').length)" class="search-box form-control">
</select>
<span asp-validation-for="selectedMembersId" class="text-danger"></span>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="console-footer">
<button class="btn btn-sm btn-info" type="submit">Submit</button>
<a id="addMembersCancel" class="btn btn-sm btn-secondary" onclick="AddNewMembersCancel()">Cancel</a>
</div>
</form>
<script>
$('.search-box').SumoSelect({ csvDispCount: 3,search: true,searchText: 'Enter here.' });
</script>
<script>
function AddNewMembersCancel() {
$('#addNewMemberModal').modal('hide');
}
</script>
</body>
</html>
我已经验证了选择至少一个成员的有效性，但是当我单击“提交”按钮而不选择成员时，它将重定向到新页面并在其中显示消息。我要在单击“提交”时在同一局部视图上显示消息吗？
解决方法
您需要添加验证脚本 jquery.validate.min.js 和 jquery.validate.unobtrusive.min.js 。
https://pypi.org/project/django-maintenance-mode/
共享文件夹中的部分视图_ValidationScriptsPartial.cshtml可以添加到您的视图中：
<partial name="_ValidationScriptsPartial" />
您有一个带有<form>按钮的submit元素，默认情况下会导致您在submit上重新加载页面。
要在单击“提交”时在同一页面上显示错误，需要防止表单的默认行为。
首先，您需要在id元素上使用某种form。假设id是new-members-form。
<form id="new-members-form" class="console-panel grid-stack-item-content" asp-action="GetNewMembers" asp-controller="Group" method="post">
...
</form>
然后，您需要选择表单，并告诉它停止执行表单提交时的默认行为。
使用JQuery：
$("new-members-form").on("submit",(event) => { event.preventDefault(); });
或普通JS：
document.getElementById("new-members-form").addEventListener("submit",function(event) {
event.preventDefault();
});
第一次查看或添加失败时，请记住设置memberList。
控制器代码
//Members to SelectListItem
public IList<SelectListItem> GetMembers()
{
var members = new List<Member>
{
new Member {Id = Guid.NewGuid(),Name = "Ada"},new Member {Id = Guid.NewGuid(),Name = "Brain"},Name = "Cater"},};
var memberListItem = members
.Select(x => new SelectListItem { Text = x.Name,Value = x.Id.ToString() })
.ToList();
return memberListItem;
}
[Route("/members")]
public IActionResult _GetNewMembers()
{
var model = new NewMembersAddViewModel {
membersList = GetMembers()
};
return View(model);
}
[Route("/api/Group/GetNewMembers")]
[HttpPost]
public IActionResult GetNewMembers(NewMembersAddViewModel groupMemberData)
{
if (ModelState.IsValid)
{
//Success
return RedirectToAction("GroupMembers","Group",new { groupId = groupMemberData.GroupId });
}
else
{
//when failed,set the memberList again.
groupMemberData.membersList = GetMembers();
return PartialView("_GetNewMembers",groupMemberData);
}
}
查看代码与您相同。
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