As a newbie I had to battle to get the Ucomment package working so I thought I would post my notes in case it helps any other newcomer.

Eddy

• UComments is only for .NET 4 and the source code is only available in the old schema. That means download, write new schema and package for .Net 3.5
• UComment is extracted from Blog 4 Umbraco so check the forums for both
• Add the following to the url to run the debug tool "?umbDebugShowTrace=true"

Comments not showing up on dashboard

In the config/dashboard.config the following should be entered (this adds comments to the admin dashboard):
 <section>
    <areas>
      <area>content</area>
    </areas>
    <tab caption="Comments">
      <control>/usercontrols/UComment/UCommentModeration.ascx</control>
    </tab>
  </section>
  <section>
    <areas>
      <area>content</area>
    </areas>
    <tab caption="Comments">
      <control>/usercontrols/UComment/UCommentModeration.ascx</control>
    </tab>
  </section>

Check the Javascript

<script type="text/javascript" src="/umbraco_client/ui/jquery.js"></script>

<script type="text/javascript" src="/scripts/jquery.form.js"></script>

<script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery.validate/1.5.5/jquery.validate.min.js"></script>

The form is "dead"

Are the input fields in a form tag?
I don't know how Ucomment works, but the input fields for the comments are not within a <form> tag. Only the search field and button is within a search form. Could this be the problem?
Do you have a form inside another form?



XSLT throws an error

Check the xsltextensions.config file. Their should be a ucomment entry:
<ext assembly="\bin\UComment" type="UComment.XSLTLibrary" alias="UCommentLibrary"></ext>
If this is incorrect then the page will throw an xslt error.

Rest extensions config
Check the rest extensions.config file. Their should be a ucomment entry:
<ext assembly="/UComment" type="UComment.Library.Base" alias="UComment">
    <permission method="CreateComment" returnXml="false" allowAll="true" />
    <permission method="GetGravatarImage" returnXml="false" allowAll="true" />
  </ext>

Comment not writing to the database

Do you have the permissions to write to the DB?

Useful Forum Posts

http://our.umbraco.org/forum/developers/extending-umbraco/6992-Extending-Blog-4-Umbraco?p=0
http://our.umbraco.org/forum/using/ui-questions/2512-Per-article-comments

http://our.umbraco.org/forum/developers/extending-umbraco/13862-Blog4Umbraco-comments-will-not-save#

http://our.umbraco.org/projects/backoffice-extensions/locator-package/help-using-the-locator/9701-Form-inside-a-form-problem

Example Sites using UComment:

http://www.sprogkernen.dk/nyheder/workshop-i-afholdt.aspx
http://www.geckonewmedia.com/blog/2009/6/4/nested-(threaded)-comments-in-umbraco-with-doc2form-and-jquery