[richfaces-issues] [JBoss JIRA] Created: (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

[Ian Springer (JIRA)]

provide a way to render a commandButton based on a minimum and/or maximum number of rows currently selected in a rich:*dataTable
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                 Key: RF-8270
                 URL: https://jira.jboss.org/jira/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


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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