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

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://jira.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: 4.0.0.Milestone1 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}" .../>