Salesforce Apex Trigger Example

sample_apex_trigger

//Apex trigger
trigger Accepted on Training__c (before update) {
  for (Training__c training : Trigger.new) {
    Training__c oldTraining = Trigger.oldMap.get(training.id);
    
    Boolean oldAccepted = oldTraining.Accepted__c.equals('YES');
    Boolean newAccepted = training.Accepted__c.equals('YES');
    
    if (!oldAccepted && newAccepted) {
     
     SendNewParticipant.sendParticipant(JSON.serialize(training));

    }
  }
}

//Apex class
public class SendNewParticipant{

    @future(callout=true)
    public static void sendParticipant(String participant)
    {
        //Replace below URL with api endpoint
        String addr = 'https://example.com/salesforce_connector/new_participant';
        HttpRequest req = new HttpRequest();
        req.setEndpoint( addr );
        req.setMethod('POST');
        req.setHeader('Content-Type','application/json');
        req.setHeader('Accept', '*/*');
        
        JSONGenerator generator = JSON.createGenerator(true);
        generator.writeStartObject();
        generator.writeObjectField('participant', participant);   
        generator.writeEndObject();


        req.setBody(generator.getAsString());
        Http http = new Http();
        HttpResponse response = http.send(req);
      
    }
}