Wrapper Class In Salesforce -Explained with Live Example

Before explaining what is wrapper class , lets discuss what is a Custom Object in Salesforce ?
Simplest Definition of a Custom Object would be - "Custom Object is a collection of Custom Fields which can be of Different Data Types".

Similarly you can assume a Wrapper Class as a collection of Several Data Types.

Now lets take an example to understand Wrapper Class. One of the most commonly asked questions , "How can I display a table of records with a check box and then process only the records that are selected?

Lets Say the Table to be displayed is Account table. Now If we clearly Observe the question asked , it requires two things in a list to be displayed , Can you guess them ?
1) Record of Account Table
2) Checkbox to select that record.

As we already mentioned that a wrapper class is a collection of Data types, lets go ahead and create a Wrapper class with variable to hold Account record and another to hold Boolean value for a check box.

Copy and Paste the below Codes:
Apex Controller

public class WOS_WrapperExample
{
public List<accountwrap> accountList{get;set;}
public List<Account> selectedAccounts {get;set;}
    
  public WOS_WrapperExample() {
  accountList = new list<accountwrap>();
  selectedAccounts= new list<account>();
   for(Account a : [select Id, Name, AccountNumber, Phone from Account limit 10])
      accountList.add(new accountwrap(a));  // Generating the list of Wrapper
  }
  
   

    public PageReference Selectedacc()
    {
        selectedAccounts.clear();
        for(accountwrap accwrapper : accountList)
        if(accwrapper.selected == true)
        selectedAccounts.add(accwrapper.acc);
        return null;
    }

    

    public class accountwrap
    { // Wrapper Class with two variables
        public Account acc{get; set;} 
        public Boolean selected {get; set;}
        public accountwrap(Account a) // Constructor of wrapper class
        {
            acc = a;
            selected = false;
        }
    }
}

Visualforce Page :

<apex:page Tabstyle="Account" controller="WOS_WrapperExample">
 <apex:form >
    <div style="float:left;margin: 10px;">
    <h1>Account list</h1>
        <table>
          <tr>
              <th>Select</th>
              <th>Account Name</th>
              <th>Phone</th>  
          </tr>
            <apex:repeat value="{!accountList}" var="a">
              <tr>
                  <td><apex:inputCheckbox value="{!a.selected}" id="checkedone" /></td>
                  <td>{!a.acc.Name}</td>
                  <td>{!a.acc.phone}</td> 
              </tr>  
            </apex:repeat>
        </table>        
    </div> 
    
    <div style="float:left;margin: 10px;">
        <h1>For Selected Account List Click <apex:commandButton value="Get Selected" action="{!Selectedacc}" reRender="selAcc"/></h1>
            <apex:outputPanel id="selAcc">
                  <table>
                      <tr>
                          <th>Account Name</th>
                          <th>Phone</th>  
                      </tr>
                        <apex:repeat value="{!selectedAccounts}" var="a">
                          <tr>
                              <td>{!a.Name}</td>
                              <td>{!a.phone}</td> 
                          </tr>  
                        </apex:repeat>
                    </table>
            </apex:outputPanel>
    </div>
 </apex:form>   
</apex:page>

Pin it

2 comments:

Unknown4 August 2016 at 08:21
Sir,
Can We solve above scenario by using standardsetcontroller?
Anonymous4 August 2016 at 12:20
This is a common example found in any website.. Can you list few more scenarios where Wrapper classes can be of use. Code for the same might not be needed but atleast few more scenarios.