[英]MVC disabling client side validation on a model field
I have a model for creating/editing items and the items can belong to a category.我有一个 model 用于创建/编辑项目,这些项目可以属于一个类别。
The category renders as a drop down so the user can choose a category, or fill in a new category via a textbox.类别呈现为下拉列表,因此用户可以选择类别,或通过文本框填写新类别。
The issue I am having is the dropdown seems to want to force the user to select a value from the drop down.我遇到的问题是下拉菜单似乎想强制用户从下拉菜单中选择 select 一个值。 The expected use is for that field to be optional.
该字段的预期用途是可选的。
Here are the relevant model properties:以下是相关的 model 属性:
[Display(Name = "Category")]
public int CategoryId { get; set; }
public System.Web.Mvc.SelectList Categories { get; set; }
And in my view:在我看来:
<div class="form-group">
@Html.LabelFor(m => m.CategoryId, new { @class = "control-label" })
@Html.DropDownList("CategoryId", Model.Categories, "Select a category", new { @class = "form-control" })
</div>
<input type="submit" value="Create" class="btn btn-primary" title="Create new item" />
And how I set the properties in controller:以及我如何在 controller 中设置属性:
// categories is a List of POCO class with CategoryId and CategoryName fields.
Categories = new SelectList(categories, "CategoryId", "CategoryName")
When I browse to the page and click Create, the category drop down is focused on, meaning the JS deems it missing, but no error message is displayed as I do not have the ValidationMessageFor() helper set.当我浏览到该页面并单击“创建”时,将关注类别下拉列表,这意味着 JS 认为它丢失了,但没有显示错误消息,因为我没有设置 ValidationMessageFor() 帮助器。
The rendered classes for the are的渲染类是
form-control input-validation-error
So how do I make this field optional?那么如何使这个字段成为可选的呢?
Edit: The data-* attributes after rendering on the select are编辑:在 select 上渲染后的 data-* 属性是
data-val-number="The field Category must be a number." data-val-required="The Category field is required."
You have to make CategoryId
nullable as:您必须将
CategoryId
设为可为空:
[Display(Name = "Category")]
public int? CategoryId { get; set; }
public System.Web.Mvc.SelectList Categories { get; set; }
This way you can make Categories as an optional field.这样,您可以将类别设置为可选字段。
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