如何在组件外部放置 Blazor EditForm 的提交按钮

Question

Blazor 文档的表单验证示例在EditForm组件中有一个提交按钮组件：

    <EditForm Model="@starship" > OnValidSubmit="@HandleValidSubmit">
        <DataAnnotationsValidator />
        <ValidationSummary />
    
        <p>
            <label for="identifier">Identifier: </label>
            <InputText id="identifier" bind Value="@starship.Identifier" />
        </p>
    
        Snip....

        <button type="submit">Submit</button>

        Snip...

    </EditForm>

无论如何，是否可以将该提交按钮放置在标签之外，EditForm并且仍然“本机”触发该EditForm组件的提交，而无需使用 JavaScript？

即代码看起来像这样：

    <!-- Want this button to submit the form in the EditForm tags-->
    <button type="submit">Submit</button>

    Snip...

    <EditForm Model="@starship" OnValidSubmit="@HandleValidSubmit">
        <DataAnnotationsValidator />
        <ValidationSummary />
    
        <p>
            <label for="identifier">Identifier: </label>
            <InputText id="identifier" bind-Value="@starship.Identifier" />
        </p>
    </EditForm>

Answer 1

这很简单：

• 添加一个id属性到EditForm
• 将提交按钮放在 之外EditForm，并将form的 id分配给其属性EditForm。

这是一个工作代码示例：

    @using System.ComponentModel.DataAnnotations;    

    <EditForm id="@MyID" Model="Model" OnValidSubmit="HandleValidSubmit">
    <DataAnnotationsValidator />

    <div class="form-group">
        <label for="name">Name: </label>
        <InputText Id="name" Class="form-control" @bind-Value="@Model.Name"> 
        </InputText>
        <ValidationMessage For="@(() => Model.Name)" />

    </div>
    <div class="form-group">
        <label for="body">Text: </label>
        <InputTextArea Id="body" Class="form-control" @bind-Value="@Model.Text"> 
        </InputTextArea>
        <ValidationMessage For="@(() => Model.Text)" />
    </div>
    </EditForm>

    <p>
        <button type="submit" form="@MyID" class="btn btn-primary">Save</button>
        <button type="button" class="btn btn-light" 
                               @onclick="@Cancel">Cancel</button>
    </p>

    @code
    {
        private string MyID = "myid";

        private Comment Model = new Comment();

        public async Task HandleValidSubmit()
        {
            //  await Task.Delay(3000);

            await Task.Run(() =>
            {
                Console.WriteLine("Saving...");
                Console.WriteLine(Model.Name);
                Console.WriteLine(Model.Text);
            });

        }

        private void Cancel()
        {
            Console.WriteLine("Cancelling...");
            Console.WriteLine(Model.Name);
            Console.WriteLine(Model.Text);
        }

       public class Comment
       {
           [Required]
           [MaxLength(10)]
           public string Name { get; set; }

           [Required]
           public string Text { get; set; }

       }

    }

希望这可以帮助...