Wrapper Class | Wrapper Class Example

Wrapper Class

A Wrapper class is a class whose instances are collection of other objects. It is used to display different objects on a Visual Force page in same table.

A Wrapper Class  is where you declare a Class as a container for an sObject to extend the functionality only for display or processing purposes.DTO is a slightly dumbed down version of such a wrapper .

Wrapper Class Example 

Wrapper class for displaying Checkbox and String Data types in single table

Create a Class with the name “WrapperIntStringDisplayClass ” :

public with sharing class WrapperIntStringDisplayClass {

// Creating lists for the object Testing__c and DataLoadTest__c.

List<Testing__c> lsttest = new List<Testing__c>();

List<DataLoadTest__c> lstdlt = new List<DataLoadTest__c>();

// Creating List for Wrapper class

public List<wrapper> lstw = new List<wrapper>();

// Get method calling from PageBlockTable and return the list of wrapper to Table

public List<wrapper> getLstwrapperIntString() {

lsttest = [select name,city__c from Testing__c];

lstdlt = [select country__c,phone__c from DataLoadTest__c];

for(Integer i=0;i<lstdlt.size();i++){

lstw.add(new wrapper(lsttest[i].name,lsttest[i].city__c,lstdlt[i].country__c,lstdlt[i].phone__c));

}

return lstw;

}

// Wrapper Class Construction

public class wrapper{

public String Tname{get;set;}

public String Tcity{get;set;}

public String Dcountry{get;set;}

public String Dphone{get;set;}

// Wrapper class constructor

public wrapper(String Tname,String Tcity,String Dcountry,String Dphone){

this.Tname=Tname;

this.Tcity=Tcity;

this.Dcountry=Dcountry;

this.Dphone=Dphone;

}

}

}

Create a VF Page with controller:

<!– Creating this page for dispaly Testing__c and DataLoadTesting__c object in single table with check box –>

<apex:page sidebar=”false” controller=”WrapperIntStringDisplayClass”>

<apex:form >

<apex:pageBlock >

<apex:pageBlockSection >

<apex:pageBlockTable value=”{!lstwrapperIntString}”             var=”w”>

<apex:column headervalue=”Action”>

<apex:inputcheckbox />

</apex:column>

<apex:column headervalue=”TestingName”>

{!w.Tname}

</apex:column>

<apex:column headerValue=”TestingCity”>

{!w.Tcity}

</apex:column>

<apex:column headervalue=”DataLoadCountry”>

{!w.Dcountry}

</apex:column>

<apex:column headerValue=”DataLoadPhone”>

{!w.Dphone}

</apex:column>

</apex:pageBlockTable>

</apex:pageBlockSection>

</apex:pageBlock>

</apex:form>

</apex:page>