[richfaces-issues] [JBoss JIRA] Updated: (RF-8270) provide a way to render a commandButton based on a minimum and/or maximum number of rows currently selected in a rich:*dataTable

[Nick Belaevski (JIRA)]

     [ https://issues.jboss.org/browse/RF-8270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nick Belaevski updated RF-8270:
-------------------------------

    Fix Version/s: Post_4.F
                       (was: Future_4.X)


> provide a way to render a commandButton based on a minimum and/or maximum number of rows currently selected in a rich:*dataTable
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: RF-8270
>                 URL: https://issues.jboss.org/browse/RF-8270
>             Project: RichFaces
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>          Components: component-tables
>    Affects Versions: 3.3.2.SR1
>            Reporter: Ian Springer
>            Assignee: Anton Belevich
>             Fix For: Post_4.F
>
>
> This is useful when a particular action only makes sense when a certain number of rows are selected - here are a few examples:
>   1) most CRUD actions only make sense when at least one row is selected
>   2) a diff/compare action would only make sense when at least two rows were selected
>   
> For RHQ, we currently have a custom component for this but would prefer use something that was built-in to RichFaces. Here's what the usage of our component (onc:selectCommandButton) looks like (not the low and high attributes, which reflect the minimum and maximum rows that must be selected:
>               <f:facet name="footer">
>                   <rich:columnGroup>
>                      <rich:column colspan="4" width="100%">
>                         <onc:selectCommandButton action="#{ResourceGroupOperationScheduleUIBean.unschedule}"
>                                                  value="UNSCHEDULE" target="selectedItems" 
>                                                  styleClass="on-pager-button buttonsmall"
>                                                  low="1"
>                                                  rendered="#{ResourceGroupUIBean.permissions.control}"/>
>                         <onc:selectCommandButton action="#{ResourceGroupOperationScheduleUIBean.executeNow}" 
>                                                  value="EXECUTE NOW" target="selectedItems" 
>                                                  styleClass="on-pager-button buttonsmall"
>                                                  low="1" high="1"
>                                                  rendered="#{ResourceGroupUIBean.permissions.control}"/>
>                      </rich:column>
>                   </rich:columnGroup>
>                </f:facet>
> However, I think a nicer way to implement this would be to add a new optional attribute to the rich:*dataTable components, e.g.:
> <rich:extendedDataTable selectedRowCount="#{MyManagedBean.selectedRowCount}" ... />
> The extendedDataTable component would update this attribute any time the selection is changed by the GUI user. Then a standard commandButton could be used as follows:
> <h:commandButton value="MyAction" rendered="#{MyManagedBean.selectedRowCount eq 1}" .../>
> An alternative to a new 'selectedRowCount' attribute would be using the existing 'selection' attribute and adding a new getSelectedRowCount() method to the org.richfaces.model.selection.Selection interface that the 'selection' attribute updates. An example of what this option would look like:
> <rich:extendedDataTable selection="#{MyManagedBean.selection}" ... />
> <h:commandButton value="MyAction" rendered="#{MyManagedBean.selection.selectedRowCount eq 1}" .../>

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