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POHaskell Snap Framework - Dynamic hyperlinks with Heist
 

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  1. POHaskell Snap Framework - Dynamic hyperlinks with Heist
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    <p>I am trying to create dynamic links using the Heist templating system. The problem is that the links are appearing as text rather than being interpreted as html. Is there a specific method to create dyamic lists like this with Heist?</p> <p>The function where the link is constructed:</p> <pre><code>renderCategories :: Monad m =&gt; Db.Category -&gt; I.Splice m renderCategories (Db.Category catid catname catdesc) = I.runChildrenWithText [ ("categoryId", T.concat $ ["&lt;a href='http://localhost:8000/thread_home?cateid=", T.pack . show $ catid, "'&gt;", T.pack . show $ catid, "&lt;/a&gt;"]) , ("categoryName", catname) , ("categoryDesc", catdesc)] </code></pre> <p>The tag appears as "http://localhost:8000/thread_home?cateid=1'>1" text on the webpage. And the source shows it as follows:</p> <pre><code>&amp;lt;a href='http://localhost:8000/thread_home?cateid=1'&amp;gt;1&amp;lt;/a&amp;gt; </code></pre> <p>I figure that I need to have it print the actual &lt; and > but I am not sure how to achieve this. As I am currently running runChildrenWithText to populate this Heist template changing to just runChildrenWith requires splices instead of text and so instead of attempting this I am hoping there is some way to runChildrenWithText without the '&lt;' and '>' being converted to '&amp;lt' and '&amp;gt'. Any help is appreciated!</p> <p>EDIT</p> <p>I am trying to manually create the link using:</p> <pre><code>renderCategories :: Monad m =&gt; Db.Category -&gt; I.Splice m renderCategories (Db.Category catid catname catdesc) = I.runChildrenWith [ ("categoryId", return $ X.Element "a"[("href", "http://localhost")] $ X.TextNode (T.pack $ show catid))] </code></pre> <p>However I am encountering two errors:</p> <pre><code>Couldn't match type `X.Node' with `[X.Node]' Expected type: I.Splice m Actual type: heist-0.11.1:Heist.Types.HeistT m m X.Node In the expression: return $ X.Element "a" [("href", "http://localhost")] $ X.TextNode (T.pack $ show catid) </code></pre> <p>and</p> <pre><code>Couldn't match expected type `[X.Node]' with actual type `X.Node' In the return type of a call of `X.TextNode' In the second argument of `($)', namely `X.TextNode (T.pack $ show catid)' </code></pre> <p>I do not really understand these errors at the moment and any help is appreciated.</p> <p>Working function for both returning the link and normal text:</p> <pre><code>renderCategories :: Monad m =&gt; Db.Category -&gt; I.Splice m renderCategories (Db.Category catid catname catdesc) = I.runChildrenWith [( "categoryId", return $ [X.Element "a" [("href", T.concat $ ["http://localhost:8000/thread_home?cateid=", T.pack $ show catid] )] [X.TextNode (T.pack $ show catid)] ] ) , ("categoryName", I.textSplice catname) , ("categoryDesc", I.textSplice catdesc)] </code></pre>
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