So this is stumping me, not my first visualforce component, but I just can't figure out why my save button never calls the saveComment action from the controller.

I added a System.asser(false); statement to make it throw an exception no matter what, just to be clear the method is never called.

When I press a comment button on a chatter post it renders the comment section as expected, but when I press the save button nothing happens (if I remove the rerender option the page refreshes but does nothing else). No exceptions in the log, and no matter what I should get a failed assertion if the method is ever called.

Help?

Without further ado, the offending code:

VF Page for a chatter-enabled custom object:

<apex:page standardController="itil_b__Incident__c" extensions="ChatterController">
  <apex:form >
  	<c:ChatterBlock subject="{!itil_b__Incident__c}" />
  </apex:form>
</apex:page>

 ChatterBlock component:

<apex:component controller="ComponentChatterBlock" allowDML="true" selfClosing="true">
	<apex:attribute name="subject" type="sObject" required="true" assignTo="{!subject}"
		description="The sObject to show a chatter feed for." />
		
	<apex:outputPanel rendered="{!IF(inited = false,'true','false')}">
		{!init}
	</apex:outputPanel>
	
	<!-- Start of Content -->
	
	<apex:outputPanel style="width: 50%; ">
	  <apex:outputPanel rendered="{!feed.posts.size > 0}" id="feedData">
	  <apex:dataTable value="{!feed.posts}" var="post" rules="All" border="2">
	  	<apex:column >
	  		{!post.posterName.name}<br />
	  		at {!post.formatedCreatedDate}
	  	</apex:column>
	  	<apex:column >
	  		<!-- Post body, for text and link posts -->
	  		<apex:outputField rendered="{!IF(post.postType = 'TextPost' || post.postType = 'LinkPost','true','false')}"
	  				value="{!post.fpost.body}" />
	  		<!-- Link URL and title for link posts -->
	  		<apex:outputLink rendered="{!IF(post.postType = 'LinkPost','true','false')}" value="{!post.fpost.LinkURL}">
	  			<br />
	  			<apex:outputField value="{!post.fpost.title}" />
	  		</apex:outputLink>
	  		<!-- Single history post -->
	  		<apex:outputText rendered="{!IF(post.fchanges.size = 1,'true','false')}" value="{!post.firstChange.fieldLabel} changed from {!post.firstChange.oldValue} to {!post.firstChange.newValue}" />
	  		<!-- Multiple History posts -->
	  		<apex:outputPanel rendered="{!IF(post.fchanges.size > 1,'true','false')}">
	  			<ul>
	  			<apex:repeat value="{!post.fchanges}" var="change">
	  				<li>{!change.fieldLabel} changed from 
	  					{!change.oldValue}
	  					to {!change.newValue} </li>
	  			</apex:repeat>
	  			</ul>
	  		</apex:outputPanel>
	  	</apex:column>
	  	<apex:column >
	  		<apex:commandButton value="Comment" rerender="{!$Component.newComment}" action="{!newComment}" >
	  			<apex:param name="commentParentId" value="{!post.postId}" assignTo="{!newComment.parentId}" />
	  		</apex:commandButton>
	  	</apex:column>
	  
	  </apex:dataTable>
	  
	  <apex:outputPanel id="newComment">
   		<apex:pageMessages />
   		CID: {!newComment.FeedItemId}
	   <apex:outputPanel rendered="{!IF(renderComment = true,'true','false')}">
	   	<apex:pageBlock >
	   		<apex:pageBlockButtons >
	   		<apex:commandButton action="{!cancelComment}" value="Cancel" />
	   		<apex:commandButton value="{!saveComment}" value="Save" rerender="feedData"/>
	   		</apex:pageBlockButtons>
	   		<apex:pageBlockSection >
	   			<apex:pageBlockSectionItem >
	   				<apex:inputField value="{!newComment.commentBody}" />
	   			</apex:pageBlockSectionItem>
	   		</apex:pageBlockSection>
	   	</apex:pageBlock>
	   </apex:outputPanel>
   		</apex:outputPanel>
	  
	  </apex:outputPanel>
	  
	  <apex:outputPanel rendered="{!feed.posts.size < 1}">
	  There are no posts for this object.
	  </apex:outputPanel>
   </apex:outputPanel>
   
</apex:component>

And my page controller:

public with sharing class ComponentChatterBlock {
	public boolean inited {get; set;}
	public sObject subject {get; set;}
	public Chatter feed {get; set;}
	public FeedComment newComment {get; set;}
	public boolean renderComment {get; set;}
	
	public ComponentChatterBlock(){
		inited = false;
	}
	
	public void getInit(){
		System.assert(inited == false);
		if(inited == false) {
			feed = new Chatter(subject, true);
			inited = true;
		}
	}
	
	public PageReference newComment(){
		newComment = new FeedComment();
		renderComment = true;
		System.debug('New comment called: '+newComment);
		return null;
	}
	public PageReference cancelComment(){
		System.assert(false);
		newComment = null;
		return null;
	}
	public PageReference saveComment(){
		System.assert(false);
		insert newComment;
		return Page.IncidentDetail;
	}
}