如何在组件外部放置 Blazor EditForm 的提交按钮

Question

Blazor 文档的 Form Validation example 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>

是否可以将提交按钮 放在 EditForm 标签的 之外，并且仍然 'natively' 触发提交 EditForm 组件而不诉诸于使用 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

很简单：

将 id 属性添加到 EditForm
将提交按钮放在 EditForm 之外，并为其 form 属性分配 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; }

       }

    }

希望对您有所帮助...

Answer 2

接受的答案对我有帮助，但我想指出代码部分中的这个变量不需要:

private string MyID = "myid";

您可以将其简化为：

<button type="submit" form="MyID" class="btn btn-primary">Save</button>

Snip...

<EditForm id="MyID" Model="Model" OnValidSubmit="HandleValidSubmit">

不需要 @MyID razor 语法变量来完成此操作。

Answer 3

对于自定义错误消息

[MaxLength(100, ErrorMessage = "Title is too long.")]
public string title { get; set; }

如何在组件外部放置 Blazor EditForm 的提交按钮

How to place submit button for a Blazor EditForm outside of the component

blazor

blazor-server-side