链接到哈姆雷特的静态文件 [英] Link to a static file from Hamlet

问题描述

我目前正在按照 Yesod Wiki上的教程进行Yesod实验。

I'm currently experimenting with Yesod by following the tutorial on the Yesod Wiki.

首先，我使用 yesod init 创建了一个yesod应用程序，并创建了一个根处理程序，该处理程序呈现一个名为首页：

First I created a yesod application using yesod init, and created a Root handler that renders a widget file called homepage:

getRootR = do
mu <- maybeAuth
defaultLayout $ do
    h2id <- lift newIdent
    setTitle "Home"
    addWidget $(widgetFile "homepage")

我在静态目录下有一个图像文件，名为 static / img / logo.png

I have an image file in the static directory call static/img/logo.png

在触摸 Settings / staticFiles.hs 后，我成功地将此文件从 default-layout.hamlet via

After touching Settings/staticFiles.hs, I successfully managed to link this file from default-layout.hamlet via

<img src=@{StaticR img_logo_png}

现在问题就出现了，我想将这个静态文件包含在我的主页小部件中，u唱完全一样的代码行。编译时出现以下错误：

The problem occurs now that I want to include this static file in my homepage widget, using exactly the same line of code. The following error occurs at compilation:

Handler/Root.hs:19:21:
    Not in scope: `img_logo_png'
    In the result of the splice:
      $(widgetFile "homepage")
    To see what the splice expanded to, use -ddump-splices
    In the first argument of `addWidget', namely
      `$(widgetFile "homepage")'
    In the expression: addWidget ($(widgetFile "homepage"))

所以我的问题是：如何链接使用 widgetFile 定义的小部件中的静态资源，以及它为什么表现正常不同的是在默认的布局模板？

So my question is: how do I link static resources in widgets defined with widgetFile, and why does it behave differently in the default layout template?

推荐答案

您需要添加一个导入到Handler / Root.hs：

You need to add an import to Handler/Root.hs:

import Settings.StaticFiles

如果一个hamlet文件需要它，那么调用该hamlet文件的任何handler.hs文件都需要先导入它。之所以default-layout.hamlet不需要任何改变，是因为它在某个地方被调用，我相信Application.hs几乎包含了所有的东西，包括静态东西。

If a hamlet file requires it then whichever handler.hs file that calls that hamlet file will need to import it first. The reason why default-layout.hamlet doesn't require any changes is because it is called somewhere in I believe Application.hs which has imports for pretty much everything, including static stuff.

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