Reload the checkboxes with previous saved information in Visual Force Page

Question

Hi I have following code for visual force and apex controller which renders the information about the 4 quarters in current year.. customer visit the page and select the check boxes and submit their preference.

It renders the page but what customer want is whenever they visit the page again the previously selected choices should be shown to them.

Visual Force to display Checkboxes

<apex:selectCheckboxes value="{!RegPeriod}" required="true">
                    <apex:selectOptions value="{!RegistrationPeriod}"/> 
</apex:selectCheckboxes>

Apex Controller:

public List<String> regPeriod = new List<String>();
    public List<String> getRegPeriod(){
        return regPeriod;
    } 
    public void setRegPeriod(List<String> RegPrd){
        regPeriod.addAll(RegPrd);
    }

public List<SelectOption> RegistrationPeriod {
        get {
            List<SelectOption> listOfRegPeriod = new List<SelectOption>();
            for(S_Period__c certiPeriod : listPeriod) {
                listOfRegPeriod.add(new SelectOption( certiPeriod.Id, certiPeriod.Name));
            }
        return listOfRegPeriod;
        }
        set;
    }

I am fetching the periods (Quarters) from one of custom object and When submitted, the values for checkboxes are saved in another custom object

Answer 1

To load the data back into the page, you'd ordinarily do this in your constructor. Note that I'd restructure your code so it's more amenable to this design.

public String[] regPeriod { get; set; }
public SelectOption[] getRegistrationPeriod() {
    List<SelectOption> listOfRegPeriod = new List<SelectOption>();
    for(S_Period__c certiPeriod : listPeriod) {
        listOfRegPeriod.add(new SelectOption( certiPeriod.Id, certiPeriod.Name));
    }
    return listOfRegPeriod;
}
public Constructor() {
    regPeriod = new String[0];
    for(Custom_Object__c record:[SELECT Id, S_Period__c FROM Custom_Object__c WHERE OwnerId = :UserInfo.getUserId()]) {
        regPeriod.add(record.S_Period__c);;
     }
}

You'll need to tweak this code to match your class name, field names, etc.