[Rails-spinoffs] Re: Problem with Prototype and JSON in a webchat

[Jarkko Laine]

On 24.5.2008, at 15.19, Zounas <[EMAIL PROTECTED]> wrote:

>
> I have a javascript interface for a webchat which receives JSON data
> from the server. Everything works smoothly using for...in loop. Now
> the problem is that after adding prototype.js script in the page
> header the response data is somehow affected with Prototype and loops
> through the Prototype script as it would be part of the response.
>
> For example the debugging area is supposed to show undefined messages
> from the server (good for PHP debugging) but with Prototype it
> displays all "var Enumerable" part of the Prototype code, userlist
> gets full of "undefined" and etc.
>
> The JSON message parsing code is basically as follows:
>
> var response = eval("(" + request.responseText + ")");
> for (var id in response.messages) {
>  var msg = response.messages[id];
>  var type = msg.type;
>  if (type == 'msg') {
>    chatlog.appendChild(newChatMsg("["+msg.time+"] &lt;"+msg.user
> +"&gt; "+msg.text));
>  }
>
>  // many other types
>
>  debug_area.appendChild(newMsgElement(msg,"debug"));
> }
>
> I'm not sure how I should change the code to get it working. Maybe
> someone could give a push?

Try

response.messages.each(function(msg){
   var type = msg.type;
...
});

for...in is not really meant for iterating over an array and Prototype  
breaks that anyway, by adding new methods to the Object prototype. Not  
sure if this is the reason to your problems but might be worth a try.

//jarkko

>
> >

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