Need to get dynamic count of the selected check-boxes - checkbox

Question

I'm having the two types of check-boxes one is for selectAll check-box in the data table header, and another type selecting the check-box for each row.
I'm doing a operation, So I need to show the confirmation message, How do I get the count of the selected check-boxes from the Managed Bean.
My code was written in JSF 1.2.
I can able to do select all records, select records, ManagedBean is working fine, But I need to get how many of them got selected for deletion.
Here is the JSF code,
<i:commandLink id="delete"
onclick="if (!confirm('#{managedBean.deleteSelectedCount}')) return false;"
action="#{managedBean.deleteRecords}"
title="Delete records"
immediate="true">
<i:graphicImage url="images/icons/delete.gif" alt="Delete records" />
</i:commandLink>
;
;//Some coding
;
//Data table code starts
<i:dataTable id="caseDataTable"
<h:column>
<f:facet name="header">
<i:selectBooleanCheckbox id="selectAllRecords" title="select All records"
value="#{managedBean.selectAll}">
<a4j:support event="onclick" reRender="caseDataTable,globalMessages" action="#{managedBean.actionSelectAllRecordss}" onsubmit="showBusyIndicator();" oncomplete="hideBusyIndicator();" />
</i:selectBooleanCheckbox>
</f:facet>
<h:outputLabel for="selectCheckbox" value="selectCheckbox"/>
<i:selectBooleanCheckbox id="selectCheckbox"
title="select a record" value="#{managedBean.selected}" >
<a4j:support event="onclick" reRender="selectAllRecords, globalMessages" action="#{managedBean.actionSelectionChange}"
onsubmit="showBusyIndicator();" oncomplete="hideBusyIndicator();"/>
</i:selectBooleanCheckbox>
</h:column>

Answer 1

Possible solution is to use h:inputHidden component (I think it exists in JSF 1.2. If not, you can find some alternative).
For example
Add h:inputHidden to the page
<h:inputHidden id="selectedCountHidden" value="#{managedBean.deleteSelectedCount}"/>
Each time you click on header check box or any of row check boxes, calculate deleteSelectedCount value and re-render h:inputHidden. Something like
<i:selectBooleanCheckbox id="selectCheckbox" title="select a record" value="#{managedBean.selected}" >
<a4j:support event="onclick" reRender="...,selectedCountHidden,..."
And now, since h:inputHidden will always hold deleteSeletedCount value, you can read its value via java script so there is no need for re-loading the page when you click on commandLink
<i:commandLink id="delete"
onclick="if(!confirm(document.getElementById('form:selectedCountHidden').value))return false;"..../>
Note that if you have form with id defined, you will need to call
document.getElementById('form:selectedCountHidden').value
Otherwise just call
document.getElementById('selectedCountHidden').value
In any case, inspect page source and you will find the exact id of p:inputHidden.