topic Cannot modify a property of a sealed object: unique? in Alfresco Archive

Cannot modify a property of a sealed object: unique?

targa2000 — Fri, 26 Mar 2010 14:10:53 GMT

trying to run todo-list sample dashlet from ixxus and got following error:Cannot modify a property of a sealed object: unique code in question: todolist.get.js// call over to Alfresco and fetch the todo listvar connector = remote.connect("alfresco");var data = connector.get("/todo");// create json

Re: Cannot modify a property of a sealed object: unique?

snig — Mon, 19 Apr 2010 06:00:59 GMT

Facing the same problem.
Any updates on this?

Thanks
Snig.

Re: Cannot modify a property of a sealed object: unique?

targa2000 — Mon, 26 Apr 2010 21:14:35 GMT

I contacted ixxus but haven't heard back from them.

Re: Cannot modify a property of a sealed object: unique?

oopepe — Tue, 15 Jun 2010 14:12:33 GMT

Hello,

i had the same problem with the sealed scope and found this https://issues.alfresco.com/jira/browse/ETHREEOH-2760 .
They describe the cause and a solution for the problem there.

Regards,
oopepe

Re: Cannot modify a property of a sealed object: unique?

daja77 — Thu, 24 Jun 2010 12:39:24 GMT

The problem is that todolist.get.js is trying to extend the Array class which is not allowed anymore in my recent Firefox. So I replaced todolist.get.js with the following code that does not extend the Array class.

   
// call over to Alfresco and fetch the todo list
var connector = remote.connect("alfresco");
var data = connector.get("/todo");

// create json object from data
var results = eval('(' + data + ')');

model.tasks = results["tasks"];

// do array unique thingy
var catArray = results["categories"];

function array_unique (categoryArray) {
   var r = new Array();
   o:for(var i = 0, n = categoryArray.length; i < n; i++)
   {
      for(var x = 0, y = r.length; x < y; x++)
      {
         if(r[x]==categoryArray[i].category)
         {
            continue o;
         }
      }
      r[r.length] = categoryArray[i].category;
   }
   return r;
}
if (catArray) {
    var unique = array_unique(catArray);
    model.cats = unique;
} else {
    model.cats = [];
}
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The dashlet loads then, but it produces similar errors when you try to add new todos. Unfortunatly that dashlet does not use the dl:todoList but its own types for implementation. Because of that I don't want to fix all the errors.

Good Luck

Re: Cannot modify a property of a sealed object: unique?

mikeh — Thu, 24 Jun 2010 14:53:26 GMT

Actually, todolist.get.js runs on the server, not the browser.

Thanks,
Mike

Re: Cannot modify a property of a sealed object: unique?

daja77 — Thu, 24 Jun 2010 15:28:26 GMT

Yes, you are right of course, but still that javascript interpreter doesn't like that the Array class gets extended.

Cheers,

Daniel

Re: Cannot modify a property of a sealed object: unique?

sebek — Tue, 11 Jan 2011 14:57:08 GMT

I refreshed this topic - is somebody managed to repairing error which is described in 1st post?

Re: Cannot modify a property of a sealed object: unique?

thewickedchild — Thu, 10 May 2012 19:13:01 GMT

We ran into this same error while trying to stop an XML document from being formatted. We tried the solution in oopepe's link, but were unable to use the deepCopy that was created.

We eventually found a solution:

      var settings = XML.settings();
      settings.prettyPrinting = false;
      XML.setSettings(settings);‍‍‍

Using this method, you can modify the settings on the XML object.