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public class TrackerExt {
    public String OpportunityId {get;set;}
    private final Opportunity opp;
    public List<Tracker__c> trackers{get; set;}

    public TrackerExt(ApexPages.StandardController controller) {
           this.opp = (Opportunity)controller.getRecord();
    }
    public List<Tracker__c> fetchTracker(){
        trackers= [Select Name, Createddate, Object__c from Tracker__c where opportunity__c=:opp.id];
        return trackers;    
    }
}

Visualforce page: 

<apex:page standardController="Opportunity" extensions="TrackerExt">

     <head>
         <meta charset="UTF-8"/>
        <title>Tracker</title>
              ID: {!OpportunityId}
             Opp: {!trackers[0].Opportunity__c}

      /------Will use trackers list of objects to use for a table here../


     </head>
</apex:page>

I don't get any data in the collection returned. I simply tried to print, use in pageblock and alert in JS. I am adding this page in opportunity page layout.

  (function(){
            var temp = '{!trackers[0].name}';
             var abc = '{!trackers[0].object__c}';
                alert(abc); })();
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2
  • are you passing correct Opportunity Id from URL? – Santanu Boral May 31 '18 at 10:53
  • Thanks Santanu. I am using this page within opportunity page layout. – shukla yogesh May 31 '18 at 10:55
3

You are trying to access the Tracker__c objects by using merge syntax ({!trackers}). This implicitly looks for a method called getTrackers() in the controller and extensions. I think if you re-name your fetchTracker() method to getTrackers() and get rid of the {get; set;} attribute called 'trackers' you should be fine.

Alternatively you can invoke the fetchTracker() function from within your constructor, which assigns the list to the {get; set;} attribute called 'trackers'.

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