[richfaces-issues] [JBoss JIRA] Commented: (RF-1133) rich:datascroller does not reset when data model is changed

[Aladdin El-Nattar (JIRA)]

    [ https://jira.jboss.org/jira/browse/RF-1133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12422829#action_12422829 ] 

Aladdin El-Nattar commented on RF-1133:
---------------------------------------

Not sure if this warrants a new issue to be created or not, but HtmlDatascroller.setPage(int) doesn't seem to work in 3.2.1.GA.

I tried it in 3.2.0 and it works. The code is quite simple. Here is my xhtml snippet:

<h:dataTable id="contents-table"
		value="#{action.contents.contentList}" var="item" rows="#{action.contents.itemsPerPage}"
		binding="#{action.contents.dataTable}">
...
</h:dataTable>
<a4j:outputPanel id="pagination-panel" layout="block">
	<rich:datascroller id="pagination-scroller" for="contents-table" renderIfSinglePage="false"
		binding="#{action.contents.scroller}" maxPages="20">
		<f:facet name="first">
			<h:outputText value="First" />
		</f:facet>
		<f:facet name="last">
			<h:outputText value="Last" />
		</f:facet>
	</rich:datascroller>
</a4j:outputPanel>

Here is my code that is triggered by a different component with reRender="contents-table, pagination-scroller":
@Name(value="action.contents)
public class ...
...
private HtmlDataTable dataTable; (getter and setter exist)
private HtmlDatascroller scroller; (getter and setter exist)
...
@Observer
public void handleNewDataEvent() {
	// Change content in table 
	populateContentList();
	logger.info("************ PAGE WAS " + this.scroller.getPage());
	this.scroller.setPage(1); 
	logger.info("************ PAGE IS " + this.scroller.getPage());
}

Conditions:
- Table contains 100 rows
- Max rows per page is 2

Use Case:
- Datascroller shows many pages
- Click on page 2
- Use different component to trigger page reset and populate table with new data

Result in logs is:
INFO  [...] ************ PAGE WAS 2
INFO  [...] ************ PAGE IS 2

Page should have been set to 1. Why is it still set to 2? It's as if setPage(int) is not doing anything.

In 3.2.0.GA I get this:
INFO  [...] ************ PAGE WAS 2
INFO  [...] ************ PAGE IS 1

and everything works fine.

> rich:datascroller does not reset when data model is changed
> -----------------------------------------------------------
>
>                 Key: RF-1133
>                 URL: https://jira.jboss.org/jira/browse/RF-1133
>             Project: RichFaces
>          Issue Type: Bug
>          Components: docs updated
>    Affects Versions: 3.1.1
>            Reporter: henrik lindberg
>            Assignee: Tsikhon Kuprevich
>            Priority: Critical
>             Fix For: 3.2.0
>
>
> When the datamodel for a rich:dataTable is replaced with a new model the rich:datascroller still remembers its old page index.
> Now, in order to make it work, I have to look up the UIData and set the index to 0 when I change the datamodel.
> I would expect it to either be set to 0, or to the value of "first" attribute in the rich:dataTable when its model is changed.
> This problem is blocking me from releasing my application - I have *many* affected datascrollers and doing the following for all of them would not be fun...
> // how I reset the first value - perhaps there are beter ways to do this
> 		String id = "spaceForm:content_list";
> 		UIComponent comp = FacesContext.getCurrentInstance().getViewRoot().findComponent( id );
> 		if(comp == null)
> 			throw new IllegalArgumentException("Can not find component with id = '"+id+"'");
> 		if(!(comp instanceof UIData))
> 			throw new IllegalArgumentException("Id does not refer to a UIData instance");
> 		UIData uidata = (UIData)comp;
> 		uidata.setFirst(0);

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