Show/Hide a particular section of VF Page

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This post is part of the previous post. you can check here---
 
Here I am using the custom controller to achieve this functionality.

Controller--

public class ShowMyContacts 
{    
    public string source {get;set;}
    public List<selectOption> sourceValue {get;set;}
    public boolean flag {get;set;}
    public boolean flag1 {get;set;}
    public boolean flag2 {get;set;}
    public Contact contact {get;set;}
    
    
    public ShowMyContacts()
    {
        flag = false;
        flag1 = false;
        flag2 = false;
        sourceValue = new List<selectOption>();
        sourceValue.add(new selectOption('','--select--'));
        sourceValue.add(new selectOption('web','Web'));
        sourceValue.add(new selectOption('phoneinquiry','Phone Inquiry'));
        sourceValue.add(new selectOption('partner','Partner Referral'));
        sourceValue.add(new selectOption('other','Others'));
    }
    
    public void doSomething()
    { 
        If(source == 'web'){
            flag = true;
            flag1 = false;
        }
        else if(source == 'phoneinquiry'){
            flag1 = true;
            flag = false;
        }
        else if(source == 'other'){
            flag2 = true;
            flag = false;
            flag1 = false;
        }
    }
}

VF Page--

<apex:page controller="ShowMyContacts">
  <apex:form id="frm" >
      <apex:pageBlock >
       <center>
          <apex:selectList value="{!source}" size="1" >
              <apex:selectOptions value="{!sourceValue}" />
              <apex:actionSupport event="onchange" action="{!doSomething}" reRender="frm"/>
          </apex:selectList> 
       </center>   
      </apex:pageBlock>
      
      
      <apex:pageBlock rendered="{!flag}">   
          <apex:pageBlockSection >
           
              <apex:inputText value="{!contact.FirstName}" label="FirstName" />
              <apex:inputText value="{!contact.Lastname}" label="LastName"/>
              <apex:inputText value="{!contact.Title}" label="Title"/>
              
          </apex:pageBlockSection>      
     </apex:pageBlock>
      
       <apex:pageBlock rendered="{!flag1}">        
          <apex:pageBlockSection >
          
              <apex:inputText value="{!contact.Phone}" label="Phone"/>
              <apex:inputText value="{!contact.HomePhone}" label="Home Phone"/>
              <apex:inputText value="{!contact.OtherPhone}" label="Other Phone"/>
              <apex:inputText value="{!contact.MobilePhone}" label="Mobile Phone"/>
              <apex:inputText value="{!contact.AssistantPhone}" label="Ass. Phone"/>
              <apex:inputText value="{!contact.Fax}" label="Fax"/>
              
          </apex:pageBlockSection>
      </apex:pageBlock>
      
      <apex:pageBlock rendered="{!flag2}">        
          <apex:pageBlockSection >
                           
              <apex:inputText value="{!contact.MailingCountry}" label="Mailing Country"/>
              <apex:inputText value="{!contact.MailingStreet}" label="Mailing Street"/>
              <apex:inputText value="{!contact.MailingCity}" label="Mailing City"/>
              <apex:inputText value="{!contact.MailingState}" label="Mailing State"/>
              <apex:inputText value="{!contact.OtherStreet}" label="Other Street"/>
              <apex:inputText value="{!contact.OtherCity}" label="Other City"/>
              
          </apex:pageBlockSection>
      </apex:pageBlock>
  </apex:form>
</apex:page>

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