[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
by 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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13 years, 9 months