Wrapper Class in Apex/Visual force page

Wrapper class is a very powerful concept that can be used in multiple scenarios. Putting aside the word "Wrapper" it is nothing but just a class.Just like what we have in a class ,we  have methods,Properties etc in a wrapper class too.Here is an use case for wrapper class

Requirement : A Visual force page has to display all the Contacts available for an Account .Contacts should be listed out in the table row wise(default being column wise) . Only created "date"(Strip the time part) of the contact should be displayed .

Sample page:

Apex Code :

view plainprint?

1. public class displayContacts  
2.    {    
3.         
4.         
5.       //Get the respective Account id  
6.       ID accountId;  
7.        
8.       //Store the wrapped Contacts  
9.       public List<contactWrapper> conWrapper{get;set;}  
10.       
11.      //COnstructor   
12.      public displayContacts()  
13.       {     
14.          accountId= string.escapeSingleQuotes(ApexPages.currentPage().getParameters().get('id'));    
15.        
16.      //Initialize list  
17.      conWrapper = new List<contactWrapper>();  
18.      for(Contact tempCon :[select FirstName,LastNAme,Email,phone,createddate from contact where accountid=:accountid])  
19.      {   
20.         //create the object for the wrapper class  
21.         contactWrapper tempWrapper = new contactWrapper(tempCon);  
22.         conwrapper.add(tempWrapper);  
23.      }  
24.        
25.        
26.     
27.       } //End of Constructor  
28.        
29.       //Wrapper class for Contact  
30.       public class contactWrapper  
31.       {        
32.          public String contactName{get;set;}  
33.          public String createdDate{get;set;}  
34.          public string phoneC{get;set;}  
35.          public string emailC{get;set;}  
36.                    
37.          public contactWrapper(Contact con)  
38.            {  
39.              contactName=con.FirstName+' '+con.LastName;  
40.              createdDate=con.createddate.month() +'/'+ con.createddate.day() +'/'+ con.createddate.year();  
41.              phoneC=con.phone;  
42.              emailC=con.email;  
43.                 
44.            }//End of Wrapper constructor  
45.    
46.      }//End of wrapper class   
47.            
48.    } //End of Class  

Visual force page :

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1. <apex:page controller="displayContacts">  
2.    <apex:pageBlock>  
3.     <apex:pageBlockSection title="Contacts Available">  
4.             <apex:dataTable value="{!conWrapper}" var="item1" border="1" columnsWidth="65px,100px" rowClasses="odd,even" styleClass="tableClass">  
5.             <apex:column width="200px">  
6.                     <table width="250" border="0">                       <tr><td><b>Name :</b></td><td>{!item1.contactName }</td></tr>                        <tr><td><b>Phone :</b></td><td>{!item1.phonec}</td></tr>                         <tr><td><b>Email :</b></td><td>{!item1.emailc} </td></tr>                        <tr><td><b>Created Date :</b></td><td>{!item1.createdDate} </td></tr>                     </table>               </apex:column>   
7.             </apex:dataTable>  
8.     </apex:pageBlockSection>  
9.     </apex:pageBlock>  
10. </apex:page>  

Result :

Huh!! now please don't catch a bug here that no values are displayed for phone. I admit i missed them..Pretty tired ...accept my apology and take it for granted :) :)

Power of wrapper is seamless .It can be used to process only the records that are selected in vf page.Click on the link for example.

http://wiki.developerforce.com/index.php/Wrapper_Class

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