布局中的表单:剃刀页面 [英] Form in Layout: Razor Pages

问题描述

我的Web应用程序布局中的form中有一个select，需要从每个页面进行访问.表单设置了一个会话变量，该变量是在每个页面上加载数据所必需的.

I have a select in a form in the Layout of my web app that needs to be accessible from every page. The form sets a session variable that is required to load data on every page.

<form asp-page-handler="CustomerChange" method="post" class="navbar-form navbar-left">
    <select name="Customer" id="Customer" class="form-control" onchange="this.form.submit()">
        <option value="">Select Customer</option>
        <option value="Vand">Vandalay</option>
        <option value="Kram">Kramerica</option>
    </select>
</form>

我知道我可以创建一个基础PageModel并从每个页面的基础上继承来响应OnPost例如

I know I can make a base PageModel and inherit from that on every page in order to respond to a OnPost e.g.

public abstract class BaseSecurePageModel : PageModel
{
    [BindProperty]
    public string Customer { get; set; }
    public virtual void OnPostCustomerChange()
    {
        HttpContext.Session.SetString("Customer", Customer);
    }
}

但是这并不适合于将模型绑定到表单，并且还要求我记得从每个页面的基类中继承.有没有正确的方法来处理需要随处可见的表单?

but this doesn't lend itself to having the model binded to the form and also requires that I remember to inherit from the base class in every page. Is there a correct way to handle forms that need to be available everywhere?

推荐答案

尝试改用控制器，并让CustomerChange ActionResult指定[Route()].我在剃须刀页面中的大多数布局项(例如购物车，本地化等)都使用了Controller，并且效果很好.

Try using a Controller instead and have your CustomerChange ActionResult specify a [Route()]. I use a Controller for most of my Layout items such as shopping carts, localization etc... in razor pages and works pretty well.

//根据史蒂文·B(Steven B)的反馈更新了答案.

// Updated answer based on feedback from Steven B.

下面是我上面提到的本地化示例.表单触发BaseController.cs

Below is an example of the localization I spoke about above. The form triggers a post against the SetLanguage method in the BaseController.cs

在这种情况下，在_Layout.cshtml文件中，我有一个局部视图:

In the _Layout.cshtml file I have, in this instance, a partial view:

@Html.Partial("_SetLanguagePartial") // Used prior to .net core 2.1

<partial name="_SetLanguagePartial" /> // Used for .net core 2.1+

_SetLanguagePartial.cshtml中的html包含具有相应的asp-controller和asp-action的表单

The html inside this _SetLanguagePartial.cshtml contains a form with the corresponding asp-controller and asp-action

 <form id="selectLanguage" asp-controller="Base" asp-action="SetLanguage" asp-route-returnUrl="@returnUrl" method="post" class="form-horizontal" role="form">
    <ul class="list-inline">
      @foreach (var culture in cultureItems)
      {
         var countryIcon = "usa.png";
         <li>
             <button type="submit" class="btn btn-sm btn-link" name="culture" title="@culture.Text" value="@culture.Value">

               @switch (culture.Text)
               {
                  case "Japanese" :
                       countryIcon = "japan.png";
                       break;
                   case "Spanish" :
                       countryIcon = "spain.png";
                       break;
                   default:
                       break;
                }

                 <img src="@Configuration["BlobStorage:StorageUrl"]/images/@countryIcon" alt="@culture.Text"/>
               </button>
          </li>
       }
   </ul>
</form>

BaseController.cs

BaseController.cs

[Route("[controller]/[action]")]
        public class BaseController : Controller
        {
            [HttpGet]
            public IActionResult GetCartViewComponent()
            {
                return ViewComponent("Cart");
            }

            [HttpPost]
            public IActionResult SetLanguage(string culture, string returnUrl)
            {
                Response.Cookies.Append(
                    CookieRequestCultureProvider.DefaultCookieName,
                    CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(culture)),
                    new CookieOptions { Expires = DateTimeOffset.UtcNow.AddYears(1)}
                );

                return LocalRedirect(returnUrl);
            }
        }

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