C# 如果没有从dropDownList中选择任何内容,是否有方法手动触发所需的验证
我有一个razor页面应用程序,它在一个cshtml页面中创建一个dropDownList 看法C# 如果没有从dropDownList中选择任何内容,是否有方法手动触发所需的验证,c#,jquery,asp.net-core,razor,mdbootstrap,C#,Jquery,Asp.net Core,Razor,Mdbootstrap,我有一个razor页面应用程序,它在一个cshtml页面中创建一个dropDownList 看法 @Html.DropDownListFor(model=>model.SelectedItem,model.Items,新建 { @class=“**下拉列表**”, }) @Html.ValidationMessageFor(model=>model.SelectedItem) 模型 public IEnumerable Items{get;set;} [必需(ErrorMessage=“所选项
@Html.DropDownListFor(model=>model.SelectedItem,model.Items,新建
{
@class=“**下拉列表**”,
})
@Html.ValidationMessageFor(model=>model.SelectedItem)
模型
public IEnumerable Items{get;set;}
[必需(ErrorMessage=“所选项目字段是必需的。”)]
public int SelectedItem{get;set;}
填充的元素
<select class="dropDown" data-val="true" data-val-number="The field Items must be a number." data-val-required="Selected Item field is required." id="SelectedItem" name="SelectedItem"></select>
<input class="form-control select-input placeholder-active" type="text" role="listbox" aria-multiselectable="false" aria-disabled="false" aria-haspopup="true" aria-expanded="false" readonly="">
验证错误消息显示当表单提交时下拉列表未选择任何内容,这是预期的行为
然而,最近我添加了一个名为Material Design Bootstrap的新JavaScript来改变组件的一些外观
看法
@Html.DropDownListFor(model=>model.SelectedItem,model.Items,新建
{
@class=“**选择**”,
})
@Html.ValidationMessageFor(model=>model.SelectedItem)
被填充的元素
<select class="dropDown" data-val="true" data-val-number="The field Items must be a number." data-val-required="Selected Item field is required." id="SelectedItem" name="SelectedItem"></select>
<input class="form-control select-input placeholder-active" type="text" role="listbox" aria-multiselectable="false" aria-disabled="false" aria-haspopup="true" aria-expanded="false" readonly="">
您可以立即看到MBD将其自定义行为更改元素从select应用到input。因此,当没有为dropdownList选择任何值时,验证错误消息不会显示,表单将成功提交。我已经手动添加了数据val=“true”和数据val required=“所选项目字段是必需的。”但这也没有帮助
我可以看到,当我添加'required'属性并提交表单时,元素会更新为
<input class="form-control select-input placeholder-active input-validation-error" type="text" role="listbox" aria-multiselectable="false" aria-disabled="false" aria-haspopup="true" aria-expanded="false" readonly="" required="" data-val="true" data-val-required="Selected Item field is requiredis required." aria-required="true" aria-describedby="-error -error -error -error -error" aria-invalid="true">
但仍然没有验证消息的迹象
是否有手动触发ValidationMessageFor的方法?这是我的整个工作演示,您可以查看: _Layout.cshtml:
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>@ViewData["Title"]</title>
<!-- Font Awesome -->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css">
<!-- Google Fonts -->
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap">
<!-- Bootstrap core CSS -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet">
<!-- Material Design Bootstrap -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.19.1/css/mdb.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<main role="main" class="pb-3">
@RenderBody()
</main>
</div>
<script src="~/js/site.js" asp-append-version="true"></script>
<!-- JQuery -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<!-- Bootstrap tooltips -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.4/umd/popper.min.js"></script>
<!-- Bootstrap core JavaScript -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.min.js"></script>
<!-- MDB core JavaScript -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.19.1/js/mdb.min.js"></script>
@RenderSection("Scripts", required: false)
</body>
</html>
@ViewData[“标题”]
@RenderBody()
@RenderSection(“脚本”,必需:false)
_ValidationScript.cshtml:
<script src="~/lib/jquery-validation/dist/jquery.validate.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"></script>
Index.cshtml:
@model DropDownDTO
<form method="post">
@Html.DropDownListFor(model => model.SelectedItem, Model.Items, new
{
@class = "**select**",
})
<div class="error">
@Html.ValidationMessageFor(model => model.SelectedItem)
</div>
<input type="submit"value="Create" />
</form>
@section Scripts
{
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
@model DropDownDTO
@DropDownListFor(model=>model.SelectedItem,model.Items,新建
{
@class=“**选择**”,
})
@Html.ValidationMessageFor(model=>model.SelectedItem)
@节脚本
{
@{wait Html.RenderPartialAsync(“_validationScript”);}
}
家庭控制器:
public async Task<ActionResult> Index()
{
var model = new DropDownDTO()
{
Items = new List<SelectListItem>() {
new SelectListItem() { Value = "", Text = "" }, //be sure add null value for the first option...
new SelectListItem() { Value = "1", Text = "Elementos1" },
new SelectListItem() { Value = "2", Text = "Elementos2" },
new SelectListItem() { Value = "3", Text = "Elementos3" }
}
};
return View(model);
}
[HttpPost]
public IActionResult Index(DropDownDTO model)
{
return View();
}
公共异步任务索引()
{
var模型=新的DropDownDTO()
{
Items=新列表(){
新建SelectListItem(){Value=”“,Text=”“},//确保为第一个选项添加空值。。。
新建SelectListItem(){Value=“1”,Text=“Elementos1”},
新建SelectListItem(){Value=“2”,Text=“Elementos2”},
新建SelectListItem(){Value=“3”,Text=“Elementos3”}
}
};
返回视图(模型);
}
[HttpPost]
公共IActionResult索引(下拉到模型)
{
返回视图();
}
您确定MDB支持下拉列表验证吗?它在我的项目中运行良好。你能分享更多的代码吗?另外,您的nuget包引用是什么?
public async Task<ActionResult> Index()
{
var model = new DropDownDTO()
{
Items = new List<SelectListItem>() {
new SelectListItem() { Value = "", Text = "" }, //be sure add null value for the first option...
new SelectListItem() { Value = "1", Text = "Elementos1" },
new SelectListItem() { Value = "2", Text = "Elementos2" },
new SelectListItem() { Value = "3", Text = "Elementos3" }
}
};
return View(model);
}
[HttpPost]
public IActionResult Index(DropDownDTO model)
{
return View();
}