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我正在尝试在我的 Yesod 应用程序中使用 CKEditor。来自 CKEditor 的数据通过 Textarea 返回到服务器,然后我将其存储Html在数据库中。我的问题是,一旦我从处理程序的数据库中检索到 Html 代数数据类型,我就知道如何显示它。我一直在阅读教程,但它只会将 Html 显示为一个大长字符串,而不是标记。

注意:titleAandcontextA是我想在 article-local-display 中显示的变量。 contextAHtml代数数据类型

PS:我是否需要将 Html 转换为 hamlet 才能渲染?

module Handler.Article where

import Import
import Data.Text (unpack)
import Data.Time (getCurrentTime)
import Data.String (fromString)

getArticleR :: Handler RepHtml
getArticleR = do
  defaultLayout $ do
      setTitle "Search For Article"
      $(widgetFile "header")
      $(widgetFile "article")

postArticleR :: Handler RepHtml
postArticleR = do
  redirect ArticleR

getArticleLocalR :: Handler RepHtml
getArticleLocalR = do
  articles <- runDB $ selectList ([] :: [Filter Article]) [Desc ArticleTime]
  defaultLayout $ do
      setTitle "Local Article"
      $(widgetFile "header")
      $(widgetFile "article-local")

getArticleLocalDisplayR :: ArticleId -> Handler RepHtml
getArticleLocalDisplayR articleId =  do 
  article <- runDB $ get404 articleId
  let titleA   = articleTitle article
      contextA = articleContext article
  defaultLayout $ do
      setTitle "Article"
      $(widgetFile "header")
      $(widgetFile "article-local-display")

getArticleLocalCreateR :: Handler RepHtml
getArticleLocalCreateR = do
  defaultLayout $ do
      setTitle "Create article"
      addScript $ StaticR ckeditor_ckeditor_js
      $(widgetFile "header")
      $(widgetFile "article-local-create")

postArticleLocalCreateR :: Handler RepHtml
postArticleLocalCreateR = do
  articleForm <- runInputPost $ ArticleForm <$> ireq textField "title" <*> ireq textareaField "editor1"
  now         <- liftIO getCurrentTime
  let titleA  =  title articleForm
      html    =  toHtml $ unTextarea $ context articleForm
  _           <- runDB $ insert $ Article titleA html now
  redirect ArticleLocalR

data ArticleForm = ArticleForm {
    title   :: Text,
    context :: Textarea
  }
  deriving Show

模型文件:

Article
  title Text
  context Html
  time UTCTime
  deriving

文章-本地-display.hamlet

<h1>#{titleA}
<article>#{contexA}
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1 回答 1

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所以我将上下文从 Html 更改为 Text。

Article
  title Text
  context Text
  time UTCTime
  deriving

然后preEscapedText在使用值时添加。

let contextA = preEscapedText $ articleContext article

现在它可以正常显示了。

于 2013-06-03T05:03:10.553 回答