How to remember Picklist selection in Custom Edit Page

Question

I am having a Custom Object, which has a field Country__c. (Picklist).

When I am clicking the Edit page, it is going to a Custom Visualforce page. But, there in that page, Country__c is showing blank, as if it didn’t remember the country that was chosen.

I've written Extension Controller for this particular object.

Any solution for this?

Below is my Constructor for Extension Class

Apex Code

public class MyGroupConfigControllerExt {

    public final My_Config__c mpgcObj {get; private set;} 
    ApexPages.StandardController stdController;
    public list<SelectOption> specDiscountPicklist {get; private set;}
    public String selectedDiscount {get; set;}

    public MyGroupConfigControllerExt(ApexPages.StandardController Controller) {
        stdController = Controller;

        //we cannot use addFields within test methods, so we have to wrap it in a Test.isRunningTest()
        if (!Test.isRunningTest()) {
            stdController.addFields(new List<String> {
                'country__c'
            });
        }

        this.mpgcObj = (My_Config__c)stdController.getRecord();
        // Here I have to set mbgObj.Country__c, but how???

        mpgcObj.Country__c = ?;



    }  

Answer 1

You are displaying the string selectedDiscount on your Visualforce page, so that is what you need to set in your controller. If you are also using the visualforce page for new records and you want to have a default value for country you have to account for that as well. The following is what I have done to handle this previously:

public class MyGroupConfigControllerExt {

public final My_Config__c mpgcObj {get; private set;} 
ApexPages.StandardController stdController;
public list<SelectOption> specDiscountPicklist {get; private set;}
public String selectedDiscount {get; set;}

public MyGroupConfigControllerExt(ApexPages.StandardController Controller) {
    stdController = Controller;

    //we cannot use addFields within test methods, so we have to wrap it in a Test.isRunningTest()
    if (!Test.isRunningTest()) {
        stdController.addFields(new List<String> {
            'country__c'
        });
    }

    this.mpgcObj = (My_Config__c)stdController.getRecord();

    if(mpgcObj.Country__c != null){
       selectedDiscount = mbgObj.Country__c;
    } else {
        selectedDiscount = 'Default Value';
    }
}  

You will also want to make sure to override the save method, and make sure that you are saving the selectedDiscount into Country__c. See a previous answer I posted to my own question here for details: Dynamically display fields based on Picklist for create page