Blazor中的“禁用/启用”按钮-取决于形式

如何解决Blazor中的“禁用/启用”按钮-取决于形式

所以我正在ASP.NET Core中创建这个小项目，我已经编写了一个WEB API，但是我在Blazor的Frontend中苦苦挣扎以使用该API。 POST，GET HTTP请求效果很好。我有一个剃刀页面，在其中放置了一些数据（名称，家庭名称等），然后单击“发送”，该数据已发布到API。

关于该表格有一些验证： 名称-至少5个字符 姓氏-至少5个字符 地址-至少10个字符 EmailAdress –必须是有效的电子邮件 年龄-必须介于20和60之间

而这一切都通过DataAnnotations完成：

using System.ComponentModel.DataAnnotations;

namespace Blazor.Data
{
    public class Applicant
    {
        public int Id { get; set; }

        [MinLength(5,ErrorMessage ="Name must contain atleast 5 characters.")]
        public string Name { get; set; }

        [MinLength(5,ErrorMessage ="Family Name must contain atleast 5 characters.")]
        public string FamilyName { get; set; }

        [MinLength(10,ErrorMessage ="Address must contain atleast 10 characters.")]
        public string Address { get; set; }

        public string CountryOfOrigin { get; set; }

        [EmailAddress(ErrorMessage ="E-Mail adress is not valid.")]
        public string EmailAddress { get; set; }

        [Range(20,60,ErrorMessage ="Age must be between 20 and 60.")]
        public int Age { get; set; }

        public bool Hired { get; set; }
    }
}

在“剃刀”页面中，我有一张表格要填写，然后发送给API，如下所示：

@page "/postapplicant"
@using Blazor.Data
@using System.Web
@inherits ApplicantCreateBase

<h1>Create an Applicant</h1>

<p>This component demonstrates posting a data to a Web API.</p>

<EditForm Model="@Applicant" OnValidSubmit="@SendValid">
    <DataAnnotationsValidator />
    <ValidationSummary />

    <hr />
    <div class="form-group row">
        <label for="Name" class="col-sm-2 col-form-label">
            First Name
        </label>
        <div class="col-sm-10">
            <InputText id="Name" class="form-control" placeholder="First Name"
                       @bind-Value="Applicant.Name" />
            <ValidationMessage For="@(() =>Applicant.Name)" />
        </div>
    </div>
    <div class="form-group row">
        <label for="FamilyName" class="col-sm-2 col-form-label">
            Family Name
        </label>
        <div class="col-sm-10">
            <InputText id="FamilyName" class="form-control" placeholder="Family Name"
                       @bind-Value="Applicant.FamilyName" />
            <ValidationMessage For="@(() =>Applicant.FamilyName)" />
        </div>
    </div>
    <div class="form-group row">
        <label for="Address" class="col-sm-2 col-form-label">
            Address
        </label>
        <div class="col-sm-10">
            <InputText id="Address" class="form-control" placeholder="Address"
                       @bind-Value="Applicant.Address" />
            <ValidationMessage For="@(() =>Applicant.Address)" />
        </div>
    </div>
    <div class="form-group row">
        <label for="CountryOfOrigin" class="col-sm-2 col-form-label">
            Country
        </label>
        <div class="col-sm-10">
            <InputSelect id="CountryOfOrigin" class="form-group" placeholder="Country Of Origin"
                         @bind-Value="Applicant.CountryOfOrigin">
                @foreach (var item in Countries)
                {
                    <option>@item.Title</option>
                }
            </InputSelect>
        </div>
    </div>
    <div class="form-group row">
        <label for="EMailAddress" class="col-sm-2 col-form-label">
            E-Mail Address
        </label>
        <div class="col-sm-10">
            <InputText id="EMailAddress" class="form-control" placeholder="E-Mail Address"
                       @bind-Value="Applicant.EmailAddress" />
            <ValidationMessage For="@(() =>Applicant.EmailAddress)" />
        </div>
    </div>
    <div class="form-group row">
        <label for="Age" class="col-sm-2 col-form-label">
            Age
        </label>
        <div class="col-sm-10">
            <InputNumber id="Age" class="form-control" placeholder="Age"
                         @bind-Value="Applicant.Age" />
            <ValidationMessage For="@(() =>Applicant.Age)" />
        </div>
    </div>
    <div class="form-group row">
        <label for="Hired" class="col-sm-2 col-form-label">
            Hired
        </label>
        <div class="col-md-1">
            <InputCheckBox id="Hired" class="form-control" placeholder="Hired"
                           @bind-Value="Applicant.Hired" />
        </div>
    </div>
    <button class="btn btn-primary"  type="submit">Send</button>
    <button class="btn btn-secondary" type="button" @onclick="Reset_Click">Reset</button>

</EditForm>
<Confirm ConfirmationChanged="ConfirmReset_Click" @ref="ResetConfirmation"></Confirm>

一切正常，并按预期工作，但我希望仅在根据我上面列出的规则对整个表单有效的情况下才启用发送按钮。我知道您可以在按钮内使用此禁用属性，但是我不知道如何正确实现此功能。在C＃/ .net内核中看起来像是一团糟。从头开始编写Web api更容易。帮助将不胜感激，谢谢！

解决方法

您可以访问EditForm的上下文：

  <button class="btn btn-primary" type="submit" disabled="@(!context.Validate())">Send</button>

,

为了避免在表单尚未修改（即初始）时显示验证错误消息，您可以使用：

Disabled="@(!context.IsModified() || !context.Validate())"