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How to retain and display the checkbox selection in visualforce paging?

Here is the example of Visualforce Page Pagination with checkbox selection, on Account object.
Custom Controller: PagingWithCheckBox.cls

public with sharing class PagingWithCheckBox{
 
    //Properties
    public integer PageSize {get;set;}
    public integer PageNumber {get;set;}
    public integer RecordCount {get;set;}
    public List<accountwrapper> objAWList {get;set;}
    private Set<id> selectedAccountIds;
    public boolean displayPopup {get; set;}  
    public List<account> objSelectedAccounts {get; set;}  
     
    //Constructor
    public PagingWithCheckBox() {
        PageSize = 10;
        PageNumber = 1;   
        RecordCount = [Select Count() From Account];
        selectedAccountIds = new Set<id>();
        objAWList = new List<accountwrapper>();
        objSelectedAccounts  = new List<account>();
         
    }
     
    //Close Popup
    public void closePopup() {        
        displayPopup = false;    
    }     
     
    //Show Popup
    public void showPopup() {  
        setSelectedAccounts();      
        displayPopup = true;    
        objSelectedAccounts  = GetSelectedAccounts();
    }
     
    //Get Selected Accounts
    public Integer getSelectedCount(){
        return this.selectedAccountIds.size();
    }
     
    //Get Selected Accounts Detail
    public List<account> GetSelectedAccounts(){    
        List<account> objAccList = [Select Id, Name, Industry, Website, AccountNumber 
                                    From Account  Where ID IN : selectedAccountIds];       
        return objAccList;
    }
     
     
    private void setSelectedAccounts()
    {
        for(AccountWrapper item: objAWList)
        {
            if(item.IsSelected)
            {    
                if(!this.selectedAccountIds.contains(item.AccountId))
                {
                    this.selectedAccountIds.add(item.AccountId);
                }
            }
            else
            {
                if(this.selectedAccountIds.contains(item.AccountId))
                {
                    this.selectedAccountIds.remove(item.AccountId);
                }
            }
        }        
    }
     
    public integer PageIndex {
        get { return (PageNumber - 1); }
    }    
     
    public integer PageCount {
        get { return getPageCount(); }
    }
     
    public integer Offset {
        get { return (PageSize * PageIndex); }
    }
     
    public List<accountwrapper> GetAccountList() {
        objAWList = new List<accountwrapper>();
        try {
            Account[] objAccList = [Select Id, Name, Industry, Website, AccountNumber
                                    From Account order by Name 
                                    Limit :PageSize
                                    offset :Offset];
                                     
             for(Account acc : objAccList){
                AccountWrapper objAW = new AccountWrapper();
                objAW.AccountId = acc.Id;
                objAW.AccountName = acc.Name;
                objAW.Industry = acc.Industry;
                objAW.Website = acc.Website;
                objAW.AccountNumber = acc.AccountNumber;
                if(this.selectedAccountIds.contains(acc.Id)){
                    objAW.IsSelected = true;
                }
                else{
                    objAW.IsSelected = false;
                }
                objAWList.Add(objAW);
           }             
        return objAWList;
    }
    catch (QueryException e) {
        ApexPages.addMessages(e);   
        return null;
        }
    }
     
    public integer LNumber {
        get { return RecordCount == 0 ? 0 : (Offset + 1); }
    }
 
    public integer UNumber {
        get { 
            integer iUNum = ((LNumber + PageSize) - 1);
            return (iUnum > RecordCount) ? RecordCount : iUNum; 
        }
    }
     
    public boolean AllowMoveNext {
        get{ return ((PageIndex + 1) < PageCount); } } public boolean AllowMovePrev { get{ return (PageIndex > 0); }
    }
     
    public void Prev() {
        setSelectedAccounts();
        PageNumber--;
 
        if (PageNumber <= 0) { PageNumber = 1; } } public void Next() { setSelectedAccounts(); PageNumber++; if (PageNumber > PageCount) {
            PageNumber = PageCount;
        }
    }
     
    public void Last() {
        setSelectedAccounts();
        PageNumber = PageCount; 
    }
 
    public void First() {
        setSelectedAccounts();
        PageNumber = 1;
    }
     
    private integer getPageCount() {
        integer iPageCount = 1;
 
        if (RecordCount != 0 && PageSize != 0) {
            iPageCount = (RecordCount/PageSize) + ((Math.mod(RecordCount, PageSize)) > 0 ? 1 : 0);
        }
        return iPageCount;
    }
     
    //Wrapper Class for Account
    public class AccountWrapper
    {
        public Id AccountId {get;set;}
        public String AccountName {get;set;}
        public String Industry {get;set;}
        public String Website {get;set;}
        public String AccountNumber {get;set;}
        public Boolean IsSelected{get;set;}
        public AccountWrapper()
        {
        }
    }    
}

Visualforce Page: PagingWithCheckBox.page

<apex:page doctype="html-5.0" title="Sample Visualforce Paging With CheckBox Example" controller="PagingWithCheckBox" tabstyle="Account" sidebar="false" readonly="true" cache="false">
    <apex:sectionheader title="Account" subtitle="Paging Accounts"></apex:sectionheader>
    <apex:form>
        <apex:pageblock title="View Selected Account" id="idSearchProduct">
            <apex:commandbutton value="View Selected Accounts" action="{!showPopup}" rerender="tstpopup"></apex:commandbutton>
        </apex:pageblock>
     
     <apex:outputpanel id="tstpopup">
        <apex:outputpanel styleclass="popupBackground" layout="block" rendered="{!displayPopUp}"></apex:outputpanel>
            <apex:outputpanel styleclass="custPopup" layout="block" rendered="{!displayPopUp}">
                <apex:pageblock>
               <apex:pageblocktable id="pbSelectedAccounts" value="{!objSelectedAccounts}" var="a">
                            <apex:column value="{!a.Name}" headervalue="Account Name"></apex:column>
                            <apex:column value="{!a.AccountNumber}" headervalue="Account Number"></apex:column>
                            <apex:column value="{!a.Industry}" headervalue="Industry"></apex:column>
                            <apex:column value="{!a.Website}" headervalue="Website"></apex:column>
                        </apex:pageblocktable>
               
               <center>
                <apex:commandbutton value="Close Popup" action="{!closePopup}" rerender="tstpopup"></apex:commandbutton>
                               </center>
                </apex:pageblock>
            </apex:outputpanel>
        </apex:outputpanel>
         
        <apex:pageblock title="Accounts">
            <apex:pageblocksection columns="1">
                <apex:facet name="body">
                    <apex:outputpanel layout="none">
                        <apex:pageblocktable id="pbAccounts" value="{!AccountList}" var="a">
                            <apex:column>
                                <apex:inputcheckbox value="{!a.IsSelected}"></apex:inputcheckbox>
                            </apex:column>
                            <apex:column>
                                <apex:facet name="header">Account Name</apex:facet> 
                                <apex:outputlink value="/{!a.AccountId}">{!a.AccountName}</apex:outputlink>
                            </apex:column>
                            <apex:column value="{!a.AccountNumber}" headervalue="Account Number"></apex:column>
                            <apex:column value="{!a.Industry}" headervalue="Industry"></apex:column>
                            <apex:column value="{!a.Website}" headervalue="Website"></apex:column>
                        </apex:pageblocktable>
                         <apex:outputpanel layout="block" styleclass="listViewport">


<div class="bottomNav">


<div class="paginator">
                                        <apex:panelgrid id="gridPaging" columns="3" width="100%" columnclasses="left, center, right">
                                            <apex:panelgroup>
                                                <span class="selectorTarget">
                                                    <strong>{!LNumber}-{!UNumber} of {!RecordCount}</strong>
                                                </span>
                                                <span>  </span>
                                                <span>
                                                    <strong>Total {!RecordCount} records</strong>
                                                </span>
                                                <span>  </span>
                                                <apex:actionstatus id="statusPaging">
                                                    <apex:facet name="start">
                                                        <img src="/img/loading.gif" height="14px" width="14px">
                                                    </apex:facet>
                                                    <apex:facet name="stop">
                                                        <img src="/img/s.gif" height="14px" width="14px">
                                                    </apex:facet>
                                                </apex:actionstatus>                                           
                                            </apex:panelgroup>
                                            <apex:panelgroup>
                                                <span class="prevNextLinks">
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMoveFirst" status="statusPaging" action="{!First}" rerender="gridPaging, pbAccounts" rendered="{!allowMovePrev}">
                                                            <img src="/s.gif" title="First" alt="First" class="first">
                                                        </apex:commandlink>
                                     
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMovePrev)}">
                                                            <apex:image url="/s.gif" title="First" alt="First" styleclass="firstoff"></apex:image>
                                                        </apex:outputpanel>
                                                    </span>
                                                     
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMovePrev" title="Previous" status="statusPaging" action="{!Prev}" rerender="gridPaging, pbAccounts" rendered="{!allowMovePrev}">
                                                            <img src="/s.gif" title="Previous" alt="Previous" class="prev">
                                                            <span>Previous</span>
                                                        </apex:commandlink>
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMovePrev)}">
                                                            <apex:image url="/s.gif" title="Previous" alt="Previous" styleclass="prevoff"></apex:image>
                                                            <span>Previous</span>
                                                        </apex:outputpanel>
                                                    </span>
                             
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMoveNext" title="Next" status="statusPaging" action="{!Next}" rerender="gridPaging, pbAccounts" rendered="{!allowMoveNext}">
                                                            <span>Next</span>
                                                            <img src="/s.gif" title="Next" alt="Next" class="next">
                                                        </apex:commandlink>
                             
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMoveNext)}">
                                                            <span>Next</span>
                                                            <apex:image url="/s.gif" title="Next" alt="Next" styleclass="nextoff"></apex:image>
                                                        </apex:outputpanel>
                                                    </span>
                             
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMoveLast" status="statusPaging" action="{!Last}" rerender="gridPaging, pbAccounts" rendered="{!allowMoveNext}">
                                                            <img src="/s.gif" title="Last" alt="Last" class="last">
                                                        </apex:commandlink>
                             
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMoveNext)}">
                                                            <apex:image url="/s.gif" title="Last" alt="Last" styleclass="lastoff"></apex:image>
                                                        </apex:outputpanel>
                                                    </span>
                                                </span>
                                            </apex:panelgroup>
                                            <apex:panelgroup>
                                                <span class="selectorTarget">
                                                    <strong> Page {!PageNumber} of {!PageCount}</strong>
                                                </span>
                                            </apex:panelgroup>
                                        </apex:panelgrid> 
                                     </div>


                                </div>


                            </apex:outputpanel>
                    </apex:outputpanel>
                </apex:facet>
            </apex:pageblocksection>
        </apex:pageblock>
    </apex:form>
     


<style type="text/css">
        .custPopup{
            background-color: white;
            border-width: 2px;
            border-style: solid;
            z-index: 9999;
            left: 50%;
            padding:10px;
            position: absolute;         
            width: 700px;
            margin-left: -320px;
            top:100px;
        }
        .popupBackground{
            background-color:black;
            opacity: 0.20;
            filter: alpha(opacity = 20);
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            z-index: 9998;
        }
 
    </style>


</apex:page>

Output:

1

 

2

 

3

 

4

Visualforce Page with Pagination

Here is the example of Visualforce Page Pagination on Account object.
Custom Controller: SamplePagingExample.cls

public with sharing class SamplePagingExample{
 
    //Properties
    public integer PageSize {get;set;}
    public integer PageNumber {get;set;}
    public integer RecordCount {get;set;}
     
    //Constructor
    public SamplePagingExample() {
        PageSize = 10;
        PageNumber = 1;   
        RecordCount = [Select Count() From Account];
    }
     
    public integer PageIndex {
        get { return (PageNumber - 1); }
    }    
     
    public integer PageCount {
        get { return getPageCount(); }
    }
     
    public integer Offset {
        get { return (PageSize * PageIndex); }
    }
     
    public Account[] getAccounts() {
        try {
            Account[] objAccList = [Select Id, Name, Industry, Website, AccountNumber
                                    From Account order by Name 
                                    Limit :PageSize
                                    offset :Offset];
                                     
            return objAccList;
        }
        catch (QueryException e) {
            ApexPages.addMessages(e);   
            return null;
        }
    }
     
    public integer LNumber {
        get { return RecordCount == 0 ? 0 : (Offset + 1); }
    }
 
    public integer UNumber {
        get { 
            integer iUNum = ((LNumber + PageSize) - 1);
            return (iUnum > RecordCount) ? RecordCount : iUNum; 
        }
    }
     
    public boolean AllowMoveNext {
        get{ return ((PageIndex + 1) < PageCount); } } public boolean AllowMovePrev { get{ return (PageIndex > 0); }
    }
     
    public void Prev() {
        PageNumber--;
 
        if (PageNumber <= 0) { PageNumber = 1; } } public void Next() { PageNumber++; if (PageNumber > PageCount) {
            PageNumber = PageCount;
        }
    }
     
    public void Last() {
        PageNumber = PageCount; 
    }
 
    public void First() {
        PageNumber = 1;
    }
     
    private integer getPageCount() {
        integer iPageCount = 1;
 
        if (RecordCount != 0 && PageSize != 0) {
            iPageCount = (RecordCount/PageSize) + ((Math.mod(RecordCount, PageSize)) > 0 ? 1 : 0);
        }
        return iPageCount;
    }
}

Visualforce Page: SamplePagingExample.page

<apex:page doctype="html-5.0" title="Sample Visualforce Paging Example" controller="SamplePagingExample" tabstyle="Account" sidebar="false" readonly="true" cache="false">
    <apex:sectionheader title="Account" subtitle="Paging Accounts"></apex:sectionheader>
    <apex:form>
        <apex:pageblock title="Accounts">
            <apex:pageblocksection columns="1">
                <apex:facet name="body">
                    <apex:outputpanel layout="none">
                        <apex:pageblocktable id="pbAccounts" value="{!Accounts}" var="a">
                            <apex:column>
                                <apex:facet name="header">Account Name</apex:facet> 
                                <apex:outputlink value="/{!a.Id}">{!a.Name}</apex:outputlink>
                            </apex:column>
                            <apex:column value="{!a.AccountNumber}"></apex:column>
                            <apex:column value="{!a.Industry}"></apex:column>
                            <apex:column value="{!a.Website}"></apex:column>
                        </apex:pageblocktable>
                         <apex:outputpanel layout="block" styleclass="listViewport">

<div class="bottomNav">

<div class="paginator">
                                        <apex:panelgrid id="gridPaging" columns="3" width="100%" columnclasses="left, center, right">
                                            <apex:panelgroup>
                                                <span class="selectorTarget">
                                                    <strong>{!LNumber}-{!UNumber} of {!RecordCount}</strong>
                                                </span>
                                                <span>  </span>
                                                <span>
                                                    <strong>Total {!RecordCount} records</strong>
                                                </span>
                                                <span>  </span>
                                                <apex:actionstatus id="statusPaging">
                                                    <apex:facet name="start">
                                                        <img src="/img/loading.gif" height="14px" width="14px">
                                                    </apex:facet>
                                                    <apex:facet name="stop">
                                                        <img src="/img/s.gif" height="14px" width="14px">
                                                    </apex:facet>
                                                </apex:actionstatus>                                           
                                            </apex:panelgroup>
                                            <apex:panelgroup>
                                                <span class="prevNextLinks">
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMoveFirst" immediate="true" status="statusPaging" action="{!First}" rerender="gridPaging, pbAccounts" rendered="{!allowMovePrev}">
                                                            <img src="/s.gif" title="First" alt="First" class="first">
                                                        </apex:commandlink>
                                     
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMovePrev)}">
                                                            <apex:image url="/s.gif" title="First" alt="First" styleclass="firstoff"></apex:image>
                                                        </apex:outputpanel>
                                                    </span>
                                                     
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMovePrev" immediate="true" title="Previous" status="statusPaging" action="{!Prev}" rerender="gridPaging, pbAccounts" rendered="{!allowMovePrev}">
                                                            <img src="/s.gif" title="Previous" alt="Previous" class="prev">
                                                            <span>Previous</span>
                                                        </apex:commandlink>
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMovePrev)}">
                                                            <apex:image url="/s.gif" title="Previous" alt="Previous" styleclass="prevoff"></apex:image>
                                                            <span>Previous</span>
                                                        </apex:outputpanel>
                                                    </span>
                             
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMoveNext" immediate="true" title="Next" status="statusPaging" action="{!Next}" rerender="gridPaging, pbAccounts" rendered="{!allowMoveNext}">
                                                            <span>Next</span>
                                                            <img src="/s.gif" title="Next" alt="Next" class="next">
                                                        </apex:commandlink>
                             
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMoveNext)}">
                                                            <span>Next</span>
                                                            <apex:image url="/s.gif" title="Next" alt="Next" styleclass="nextoff"></apex:image>
                                                        </apex:outputpanel>
                                                    </span>
                             
                                                    <span class="prevNext">
                                                        <apex:commandlink id="linkMoveLast" immediate="true" status="statusPaging" action="{!Last}" rerender="gridPaging, pbAccounts" rendered="{!allowMoveNext}">
                                                            <img src="/s.gif" title="Last" alt="Last" class="last">
                                                        </apex:commandlink>
                             
                                                        <apex:outputpanel layout="none" rendered="{!NOT(allowMoveNext)}">
                                                            <apex:image url="/s.gif" title="Last" alt="Last" styleclass="lastoff"></apex:image>
                                                        </apex:outputpanel>
                                                    </span>
                                                </span>
                                            </apex:panelgroup>
                                            <apex:panelgroup>
                                                <span class="selectorTarget">
                                                    <strong> Page {!PageNumber} of {!PageCount}</strong>
                                                </span>
                                            </apex:panelgroup>
                                        </apex:panelgrid> 
                                     </div>

                                </div>

                            </apex:outputpanel>
                    </apex:outputpanel>
                </apex:facet>
            </apex:pageblocksection>
        </apex:pageblock>
    </apex:form>
</apex:page>

Output:

download

How to Lock records using Apex in Salesforce?

Using UPDATE keyword in SOQL helps us to lock the records from being updating from another request.

Sample Code:

Account [] objAccts = [SELECT Id, Name FROM Account where Country='India' FOR UPDATE];

Note: We can’t use the ORDER BY keywords in any SOQL query that uses locking.

Difference between Unmanaged Package and Managed Package in Salesforce

Unmanaged Package:

  • Unmanaged packages are typically used to distribute open-source projects or application templates to provide developers with the basic building blocks for an application.
  • Once the components are installed from an unmanaged package, the components can be edited in the organization they are installed in.
  • The developer who created and uploaded the unmanaged package has no control over the installed components, and can’t change or upgrade them.
  • Unmanaged packages should not be used to migrate components from a sandbox to production organization. Instead, use Change Sets.

Managed Package:

  • Managed packages are typically used by Salesforce.com partners to distribute and sell applications to customers.
  • Once the components are installed from a managed package, the components cannot be edited in the organization they are installed in.
  • Managed packages are also fully upgradeable.
  • To ensure seamless upgrades, certain destructive changes, like removing objects or fields, can not be performed.