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Force.com Cookbook Sample Code
Chapter 13: Getting Started with Visualforce - Creating a Wizard with Visualforce Pages

To download all the code samples, access the Cookbook. -

/*
* This class is the controller behind the New Customer Opportunity
* wizard. The new wizard is comprised of three pages, each of
* which utilizes the same instance of this controller.
*/

public class newOpportunityController {

	// These four class variables maintain the state of the wizard.
	// When users enter data into the wizard, their input is stored
	// in these variables.
	Account account;
	Contact contact;
	Opportunity opportunity;
	OpportunityContactRole role;

	// The next four methods return one of each of the four class
	// variables. If this is the first time the method is called,
	// it creates an empty record for the variable.
	public Account getAccount() {
		if(account == null) account = new Account();
		return account;
	}

	public Contact getContact() {
		if(contact == null) contact = new Contact();
		return contact;
	}
	
	public Opportunity getOpportunity() {
		if(opportunity == null) opportunity = new Opportunity();
		return opportunity;
	}
	
	public OpportunityContactRole getRole() {
		if(role == null) role = new OpportunityContactRole();
		return role;
	}
	
	// The next three methods are used to control navigation through
	// the wizard. Each returns a reference to one of the three pages
	// in the wizard.
	public PageReference step1() {
		return Page.newOpptyStep1;
	}
	public PageReference step2() {
		return Page.newOpptyStep2;
	}
	public PageReference step3() {
		return Page.newOpptyStep3;
	}

	
	// This method performs the final save for all four objects, and
	// then navigates the user to the detail page for the new
	// opportunity.
	public PageReference save() {

		// Create the account. Before inserting, copy the contact's
		// phone number into the account phone number field.
		account.phone = contact.phone;
		insert account;

		// Create the contact. Before inserting, use the id field
		// that's created once the account is inserted to create
		// the relationship between the contact and the account.
		contact.accountId = account.id;
		insert contact;

		// Create the opportunity. Before inserting, create
		// another relationship with the account.
		opportunity.accountId = account.id;
		insert opportunity;

		// Create the junction contact role between the opportunity
		// and the contact.
		role.opportunityId = opportunity.id;
		role.contactId = contact.id;
		insert role;

		// Finally, send the user to the detail page for
		// the new opportunity.
		// Note that using '/' in the new PageReference object keeps
		// the user in the current instance of salesforce, rather than
		// redirecting him or her elsewhere.
		PageReference opptyPage = new PageReference('/' + opportunity.id);
		opptyPage.setRedirect(true);
		return opptyPage;
	}
}

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