TextBox

Question

我想验证文本框，文本框是列表类型，以便如何使用JavaScript进行验证？

我需要以下验证：

文本框不应为空，不能重复

以下是我的代码

@model List
@using (Html.BeginForm("CreateCategory", "CategoryAndSubCategory", FormMethod.Post, new { enctype = "multipart/form-data", @id = "category" }))
{
  @Html.AntiForgeryToken()
  @Html.ValidationSummary(true, "", new { @class = "text-danger" })
  @Html.Label("Category Name", htmlAttributes: new { @class = "control-label col-md-2 required" })
  @Html.EditorFor(a => a[j].Category, new { @class = "form-control", @placeholder = "Enter Category Name", @style = "text-transform: capitalize" })
  @Html.ValidationMessageFor(a => a[j].Category, "", new { @class = "text-danger" })
}