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POTrouble with building up a string in Clojure
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  1. POTrouble with building up a string in Clojure
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    copied!<p>[this may seem like my problem is with Compojure, but it isn't - it's with Clojure]</p> <p>I've been pulling my hair out on this seemingly simple issue - but am getting nowhere.</p> <p>I am playing with Compojure (a light web framework for Clojure) and I would just like to generate a web page showing showing my list of todos that are in a PostgreSQL database. </p> <p>The code snippets are below (left out the database connection, query, etc - but that part isn't needed because specific issue is that the resulting HTML shows nothing between the &lt;body&gt; and &lt;/body&gt; tags).</p> <p>As a test, I tried hard-coding the string in the call to main-layout, like this: (html (main-layout "Aki's Todos" "Haircut&lt;br&gt;Study Clojure&lt;br&gt;Answer a question on Stackoverfolw")) - and it works fine.</p> <p>So the real issue is that I do not believe I know how to build up a string in Clojure. Not the idiomatic way, and not by calling out to Java's StringBuilder either - as I have attempted to do in the code below.</p> <p>A virtual beer, and a big upvote to whoever can solve it! Many thanks!</p> <p>=============================================================</p> <pre><code> ;The master template (a very simple POC for now, but can expand on it later) (defn main-layout "This is one of the html layouts for the pages assets - just like a master page" [title body] (html [:html [:head [:title title] (include-js "todos.js") (include-css "todos.css")] [:body body]])) (defn show-all-todos "This function will generate the todos HTML table and call the layout function" [] (let [rs (select-all-todos) sbHTML (new StringBuilder)] (for [rec rs] (.append sbHTML (str rec "&lt;br&gt;&lt;br&gt;"))) (html (main-layout "Aki's Todos" (.toString sbHTML))))) </code></pre> <p>=============================================================</p> <p>Again, the result is a web page but with nothing between the body tags. If I replace the code in the for loop with println statements, and direct the code to the repl - forgetting about the web page stuff (ie. the call to main-layout), the resultset gets printed - BUT - the issue is with building up the string.</p> <p>Thanks again.</p> <p>~Aki</p>
 

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