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Activity › Forums › Salesforce® Discussions › What Is The Controller Extension?

  • shariq

    Member
    September 20, 2018 at 3:10 PM

    Hi,

    Any apex class having a public constructor with Custom Controller or Standard Controller object as a single argument is known as controller extension.

    Thanks

  • Parul

    Member
    September 20, 2018 at 6:16 PM

    Hi

    A controller extension is an Apex class that extends the functionality of a standard or custom controller. Use controller extensions when: You want to leverage the built-in functionality of a standard controller but override one or more actions, such as edit, view, save, or delete.
    You want to add new actions.
    You want to build a Visualforce page that respects user permissions. Although a controller extension class executes in system mode, if a controller extension extends a standard controller, the logic from the standard controller does not execute in system mode. Instead, it executes in user mode, in which permissions, field-level security, and sharing rules of the current user apply.

     

     

  • shariq

    Member
    September 20, 2018 at 10:47 PM

    Hi,

    Adding Example -

     

    Code for Visualforce page

    <apex:page Controller="AddmultipleAccountsController">
    <apex:form >
    <apex:pageBlock >
    <apex:pageBlockTable value="{!listAccount}" var="acc">
    <apex:column headerValue="Account Name">
    <apex:inputField value="{!acc.Name}"/>
    </apex:column>
    <apex:column headerValue="Account Number">
    <apex:inputField value="{!acc.AccountNumber}"/>
    </apex:column>
    <apex:column headerValue="Account Type">
    <apex:inputField value="{!acc.Type}"/>
    </apex:column>
    <apex:column headerValue="Industry">
    <apex:inputField value="{!acc.Industry}"/>
    </apex:column>
    </apex:pageBlockTable>
    <apex:pageBlockButtons >
    <apex:commandButton value="Add one more account" action="{!addAccount}"/>
    <apex:commandButton value="Save Accounts" action="{!saveAccount}"/>
    </apex:pageBlockButtons>
    </apex:pageBlock>
    </apex:form>
    </apex:page>
    Code for custom controller:

    public class AddmultipleAccountsController {
    Account account = new Account();
    public list<Account> listAccount{ get; set; }

    public AddmultipleAccountsController()
    {
    listAccount=new list<Account>();
    listAccount.add(account);
    }

    Public void addAccount()
    {
    Account acc = new Account();
    listAccount.add(acc);
    }
    public PageReference saveAccount() {
    for(Integer i=0; i<listAccount.size(); i++)
    {
    insert listAccount;
    }
    return Page.Allaccountssaved;    // I am returning another vf page here.
    }
    }

    Hope this helps.

  • Parul

    Member
    September 21, 2018 at 3:31 AM

    Hi Shariq, Here is the example of Controller Extension:

     

    <apex:page standardController=”Account” extensions=”myControllerExtension”>
    {!greeting} <p/>
    <apex:form>
    <apex:inputField value=”{!account.name}”/> <p/>
    <apex:commandButton value=”Save” action=”{!save}”/>
    </apex:form>
    </apex:page>

    public class myControllerExtension {

    private final Account acct;

    // The extension constructor initializes the private member
    // variable acct by using the getRecord method from the standard
    // controller.
    public myControllerExtension(ApexPages.StandardController stdController) {
    this.acct = (Account)stdController.getRecord();
    }

    public String getGreeting() {
    return ‘Hello ‘ + acct.name + ‘ (‘ + acct.id + ‘)’;
    }
    }

     

    Thanks

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