8 a.m.
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https://jira.jboss.org/browse/RF-8270?page=com.atlassian.jira.plugin.syst...
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Ian Springer commented on RF-8270:
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The attribute is useful, because then the component can gray out the button and not allow
the user to even click it if the correct number of rows is not selected. That is better
than allowing the user to click the button and then failing the check and returning an
error (e.g. "at least two items must be selected!") to the user. Or were you
suggesting using JavaScript hooks to do the check just prior to submitting the AJAX
request? This would work, but hacking my own JavaScript is not desirable, when the
component could provide the functionality for me.
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/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}" .../>
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