无法在Blazor服务器端剃刀组件中使用onclick方法 [英] onclick method not working in Blazor server-side razor component

问题描述

我正在构建一个示例剃刀组件，但是我的按钮onclick方法无法启动.当我单击按钮时，什么也没有发生.我什至在方法中放置了一个断点，以查看它是否捕获了它不能捕获的东西.该组件可以渲染，但是正如我所说的那样，单击按钮时根本没有运行LoginUser方法.

I am building a sample razor component, and I can not get my button onclick method to fire. When I click the button nothing happens at all. I have even placed a break point in the method to see if it catches which it doesn't. The component does render, but as I said the LoginUser method doesn't appear run at all when clicking the button.

剃须刀配件页面:

    <div class="text-center">
        <Login FieldsetAttr="fieldsetAttr" UsernameAttr="usernameAttr" PasswordAttr="passwordInput"
               ButtonAttr="buttonAttr" ButtonText="Sign In" SignInManager="SignInManager"
               InvalidAttr="invalidAttr" />

    </div>

    @code {
        Dictionary<string, object> fieldsetAttr =
            new Dictionary<string, object>()
            {
                {"class", "form-group" }
            };

        Dictionary<string, object> usernameAttr =
            new Dictionary<string, object>()
            {
                {"class", "form-control" },
                {"type", "text" },
                {"placeholder", "Enter your user name here." }
            };

        Dictionary<string, object> passwordInput =
            new Dictionary<string, object>()
            {
                {"class", "form-control" },
                {"type", "password" }
            };

        Dictionary<string, object> buttonAttr =
            new Dictionary<string, object>()
            {
                {"class", "" },
                {"type", "button" }
            };

        Dictionary<string, object> invalidAttr =
            new Dictionary<string, object>()
            {
                {"class", "invalid-feedback" }
            };

    }

剃刀组件:

<div @attributes="FormParentAttr">
    <form @attributes="LoginFormAttr">
        <fieldset @attributes="FieldsetAttr">
            <legend>Login</legend>
            <label for="usernameId">Username</label><br />
            <input @attributes="UsernameAttr" id="usernameId" @bind="UserName" /><br />
            <label for="upasswordId">Password</label><br />
            <input @attributes="PasswordAttr" id="passwordId" @bind="Password" /><br />
            <button @attributes="ButtonAttr" @onclick="LoginUser">@ButtonText</button>
            @if(errorMessage != null && errorMessage.Length > 0)
            {
                <div @attributes="InvalidAttr">
                    @errorMessage
                </div>
            }
        </fieldset>
    </form>
</div>

@code {
    [Parameter]
    public Dictionary<string, object> FormParentAttr { get; set; }

    [Parameter]
    public Dictionary<string, object> LoginFormAttr { get; set; }

    [Parameter]
    public Dictionary<string, object> FieldsetAttr { get; set; }

    [Parameter]
    public Dictionary<string, object> UsernameAttr { get; set; }

    [Parameter]
    public Dictionary<string, object> PasswordAttr { get; set; }

    [Parameter]
    public Dictionary<string,object> ButtonAttr { get; set; }

    [Parameter]
    public SignInManager<IdentityUser> SignInManager { get; set; }

    [Parameter]
    public Dictionary<string, object> InvalidAttr { get; set; }

    private string UserName { get; set; }
    private string Password { get; set; }

    [Parameter]
    public string ButtonText { get; set; }

    private string errorMessage { get; set; }

    private async Task LoginUser(MouseEventArgs e)
    {
        var user = new IdentityUser(UserName);

        var loginResult = await SignInManager.CheckPasswordSignInAsync(user, Password, true);

        if(loginResult.Succeeded)
        {
            await SignInManager.SignInAsync(user, true);
            errorMessage = "";
        }
        else
        {
            errorMessage = "Username or password is incorrect.";
        }

    }
}

推荐答案

在我试图在

This happened to me in an MVC core project where I was trying to add blazor components following this blog's guidance. After comparing my project with the template blazor project, I discovered that it was the missing _Imports.razor file that was causing blazor.server.js to not subscribe to the click event. I added that file to my project just as it is in the template project:

@using System.Net.Http
@using Microsoft.AspNetCore.Authorization
@using Microsoft.AspNetCore.Components.Authorization
@using Microsoft.AspNetCore.Components.Forms
@using Microsoft.AspNetCore.Components.Routing
@using Microsoft.AspNetCore.Components.Web
@using Microsoft.JSInterop

然后，按一下按钮即可正常工作.

Button clicks were then working as expected.

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