public class MyPagingController {
private List accounts;
private List pageAccounts;
private Integer pageNumber;
private Integer pageSize;
private Integer totalPageNumber;
public Integer getPageNumber()
{
return pageNumber;
}
public List getAccounts()
{
return pageAccounts;
}
public Integer getPageSize()
{
return pageSize;
}
public Boolean getPreviousButtonEnabled()
{
return !(pageNumber > 1);
}
public Boolean getNextButtonDisabled()
{
if (accounts == null) return true;
else
return ((pageNumber * pageSize) >= accounts.size());
}
public Integer getTotalPageNumber()
{
if (totalPageNumber == 0 && accounts !=null)
{
totalPageNumber = accounts.size() / pageSize;
Integer mod = accounts.size() - (totalPageNumber * pageSize);
if (mod > 0)
totalPageNumber++;
}
return totalPageNumber;
}
public MyPagingController()
{
pageNumber = 0;
totalPageNumber = 0;
pageSize = 20;
ViewData();
}
public PageReference ViewData()
{
accounts = null;
totalPageNumber = 0;
BindData(1);
return null;
}
private void BindData(Integer newPageIndex)
{
try
{
if (accounts == null)
accounts = [Select id, Name, Phone, Fax from Account limit 1000];
pageAccounts = new List();
Transient Integer counter = 0;
Transient Integer min = 0;
Transient Integer max = 0;
if (newPageIndex > pageNumber)
{
min = pageNumber * pageSize;
max = newPageIndex * pageSize;
}
else
{
max = newPageIndex * pageSize;
min = max - pageSize;
min = (min <>
}
for(Account a : accounts)
{
counter++;
if (counter > min && counter <= max)
pageAccounts.add(a);
}
pageNumber = newPageIndex;
if (pageAccounts == null || pageAccounts.size() <= 0)
ApexPages.addmessage(newApexPages.message(ApexPages.severity.INFO,'Data not available for this view.'));
}
catch(Exception ex)
{
ApexPages.addmessage(newApexPages.message(ApexPages.severity.FATAL,ex.getMessage()));
}
}
public PageReference nextBtnClick() {
BindData(pageNumber + 1);
return null;
}
public PageReference previousBtnClick() {
BindData(pageNumber - 1);
return null;
}
}
-----------------------------------------
<apex:sectionHeader title="Accounts List with Paging"></apex:sectionHeader>
<apex:form >
<apex:pageBlock title="" id="pageBlock">
<apex:pageBlockButtons location="top">
<apex:commandButton value="View" action="{!ViewData}" id="theButton" rerender="pageBlock"></apex:commandButton>
</apex:pageBlockButtons>
<apex:pageMessages ></apex:pageMessages>
<div align="right" style="display:{!IF(NOT(ISNULL(accounts)),'block','none')}">
<font size="1pt">Page #: <apex:outputLabel value="{!PageNumber}"/> out of <apex:outputLabel value="{!totalPageNumber}"/> </font>
<apex:commandButton value="Previous" action="{!previousBtnClick}" disabled="{!previousButtonEnabled}" reRender="pageBlock"></apex:commandButton>
<apex:commandButton value="Next" action="{!nextBtnClick}" reRender="pageBlock" disabled="{!nextButtonDisabled}" ></apex:commandButton>
</div>
<br/><br/>
<apex:pageBlockTable value="{!accounts}" var="a" rendered="{!NOT(ISNULL(accounts))}" rows="{!PageSize}">
<apex:column >
<apex:facet name="header">Account Name</apex:facet>
<apex:outputLink value="/{!a.Id}" target="_blank">{!a.Name}</apex:outputLink>
</apex:column>
<apex:column value="{!a.Phone}"></apex:column>
<apex:column value="{!a.Fax}"></apex:column>
</apex:pageBlockTable>
<div align="right" style="display:{!IF(NOT(ISNULL(accounts)),'block','none')}">
<br/>
<font size="1pt">Page #: <apex:outputLabel value="{!PageNumber}"/> out of <apex:outputLabel value="{!totalPageNumber}"/> </font>
<apex:commandButton value="Previous" action="{!previousBtnClick}" disabled="{!previousButtonEnabled}" reRender="pageBlock"></apex:commandButton>
<apex:commandButton value="Next" action="{!nextBtnClick}" reRender="pageBlock" disabled="{!nextButtonDisabled}" ></apex:commandButton>
</div>
</apex:pageBlock>
</apex:form>
</apex:page>
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