11 November 2008

little javascript trap

Sometimes the Spartan simplicity of programming with java interfaces has a lot of appeal, especially when faced with the way Rails treats each class as an enormous hold-all for a gaggle of methods. Pros and cons yadda yadda yadda.

Having got that out of the way: Rails' to_json rocks - instant serialisation of your Ruby objects into Javascript objects. We need a JSR to do this to java.lang.Object (I mean, how many times have you needed wait() and notify()?), so Java may become Web-2.0 enabled/compliant.

Anyway, there I was merrily scripting freemarker to do what Rails gives us for free, and everything's honkey-dorey on Firefox and Safari, but Opera is choking. After the requisite banging-head-on-wall, I spot a trailing comma.

    <script type="text/javascript">
      var x = {a:1, b:2, c:3, d:4,}; // trailing comma here. This isn't the original code, btw, in case you're thinking, "duh!"
      for (var i in x) {
        document.write("<div>" + i + " is " + x[i] + "</div>");

Warning: Opera don't like trailing commaz. Solution: switch to a language that provides to_json, or keep suffering. Or drop support for Opera. Speaking of not supporting stuff, I've no idea what IE does. How dangerous is that? Here are my browser stats for the last 30 days:


Chrome? Google so pwns you dudes lol

cheers, and good luck with the code generation ...

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