<apex:page standardcontroller="Competitor__c" extensions="ctrlCompetitor" language="{!$CurrentPage.parameters.lang}" action="{!init}">
<apex:sectionheader title="{!$ObjectType.Competitor__c.label} Edit" subtitle="{!IF(ISNULL(Competitor__c.name), 'New Competitor',Competitor__c.name)}"/>
function chngPrimComp(cmp,val){
var c; var flag=0; if(cmp.checked==false && flag!=0){
alert('{!$Label.msgCantUnchk}'); cmp.checked=true; flag++; } if(cmp.checked==true && flag==0){
ctrlCompetitor.checkFirstPrimaryComp('{!$CurrentPage.parameters.retURL}',function(result, event){ if(event.status){
if(result=='false'){
c=confirm('{!$Label.msgPrmryCompCnfrm}'); if(c==true){ flag++;
ctrlCompetitor.checkPrimaryComp('{!$CurrentPage.parameters.retURL}',function(result, event){ if(event.status){} if(event.exception){} }); } else if(c==false){ cmp.checked=false; } } }
}); }
} <apex:pageMessages id="mymsg" /> <apex:form >
<apex:pageblock mode="edit" title="{!$ObjectType.Competitor__c.label} Edit"> <apex:pageblockbuttons > <apex:commandButton value="Save" action="{!Save}" />
<apex:commandbutton value="Cancel" action="{!Cancel}"/> </apex:pageblockbuttons> <apex:outputpanel > <apex:pageblocksection title="Information" showheader="true" columns="2"> <apex:inputfield id="oppid" value="{!Competitor__c.Opportunity__c}" required="true"/> <apex:inputfield value="{!Competitor__c.Amount__c}" required="false"/> <apex:inputfield value="{!Competitor__c.Competitor_Name__c}" required="true"/>
<apex:inputfield id="chkbox" value="{!Competitor__c.Primary_Competitor__c}" required="false" onchange="chngPrimComp(this,this.value);" />
<apex:inputfield value="{!Competitor__c.Competitor_Machine__c}" required="false"/>
<apex:pageblocksectionitem /> <apex:inputfield value="{!Competitor__c.Competitor_Machine_Description__c}" required="false"/> <apex:pageblocksectionitem /> </apex:pageblocksection> <apex:pageblocksection title="Competitor Strengths / Weaknesses" showheader="true" columns="2"> <apex:inputfield value="{!Competitor__c.Competitors_Strength__c}" required="false"/> <apex:inputfield value="{!Competitor__c.Competitors_Weakness__c}" required="false"/> <apex:inputfield value="{!Competitor__c.Competitive_Situation__c}" required="false"/> <apex:pageblocksectionitem /> </apex:pageblocksection> <apex:pageblocksection title="System Information" showheader="true" columns="2"> <apex:inputfield value="{!Competitor__c.Name}" required="true"/>
</apex:pageblocksection> </apex:outputpanel> </apex:pageblock>
</apex:form>

</apex:page>

<apex:page standardcontroller="Competitor__c" extensions="ctrlCompetitor" language="{!$CurrentPage.parameters.lang}" action="{!init}">
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"/>  
    <apex:sectionheader title="{!$ObjectType.Competitor__c.label} Edit" subtitle="{!IF(ISNULL(Competitor__c.name), 'New Competitor',Competitor__c.name)}"/>
    <script>    
    function chngPrimComp(cmp,val){        
        var c; 
        var flag=0;
        if(cmp.checked==false && flag!=0){            
            alert('{!$Label.msgCantUnchk}');
            cmp.checked=true;
            flag++;
        }
        if(cmp.checked==true && flag==0){              
            ctrlCompetitor.checkFirstPrimaryComp('{!$CurrentPage.parameters.retURL}',function(result, event){
                if(event.status){            
                    if(result=='false'){                    
                    c=confirm('{!$Label.msgPrmryCompCnfrm}');
                        if(c==true){
                        flag++;                               
                            ctrlCompetitor.checkPrimaryComp('{!$CurrentPage.parameters.retURL}',function(result, event){
                                if(event.status){}
                                if(event.exception){}
                            });
                        }
                        else if(c==false){
                        cmp.checked=false;
                        }
                    }
                }   
            });
        }        
    }
    </script>
    **<apex:pageMessages id="mymsg" />**
    <apex:form >   
        <apex:pageblock mode="edit" title="{!$ObjectType.Competitor__c.label} Edit">
            <apex:pageblockbuttons > 
                <apex:commandButton value="Save" action="{!Save}" />                               
                <apex:commandbutton value="Cancel" action="{!Cancel}"/>
            </apex:pageblockbuttons>
            <apex:outputpanel >
                <apex:pageblocksection title="Information" showheader="true" columns="2">
                        <apex:inputfield id="oppid" value="{!Competitor__c.Opportunity__c}" required="true"/>
                        <apex:inputfield value="{!Competitor__c.Amount__c}" required="false"/>
                        <apex:inputfield value="{!Competitor__c.Competitor_Name__c}" required="true"/>                 
                        <apex:inputfield id="chkbox" value="{!Competitor__c.Primary_Competitor__c}" required="false" onchange="chngPrimComp(this,this.value);" />                                               
                        <apex:inputfield value="{!Competitor__c.Competitor_Machine__c}" required="false"/>                                                
                        <apex:pageblocksectionitem />
                        <apex:inputfield value="{!Competitor__c.Competitor_Machine_Description__c}" required="false"/>
             <apex:pageblocksectionitem />
                </apex:pageblocksection>
                    <apex:pageblocksection title="Competitor Strengths / Weaknesses" showheader="true" columns="2">
                        <apex:inputfield value="{!Competitor__c.Competitors_Strength__c}" required="false"/>
                        <apex:inputfield value="{!Competitor__c.Competitors_Weakness__c}" required="false"/>
                        <apex:inputfield value="{!Competitor__c.Competitive_Situation__c}" required="false"/>
         <apex:pageblocksectionitem />
                </apex:pageblocksection>
                        <apex:pageblocksection title="System Information" showheader="true" columns="2">
                        <apex:inputfield value="{!Competitor__c.Name}" required="true"/>                        
                 </apex:pageblocksection>
            </apex:outputpanel>
        </apex:pageblock>       
    </apex:form>

</apex:page>

================================================================================

public with sharing class ctrlCompetitor { 

   
    
    public static Integer flag=0; 
   
 public Competitor__c cc{get;set;} 
    public Competitor__c cc1=new Competitor__c(); 
    public List<Competitor__c> listComptr=new List<Competitor__c>();  
    public ctrlCompetitor(){}
           
    //extension invoked to pre-populate the Name parameter
    public ctrlCompetitor(ApexPages.StandardController stdController) {  
     try{
       cc=new Competitor__c();      
       cc = (Competitor__c)stdController.getRecord(); 
       if(ApexPages.currentPage().getParameters().get('Name')!=null)
         cc.Name=ApexPages.currentPage().getParameters().get('Name'); 
     }
     catch(Exception e){System.debug(e.getMessage());}
    }
   
   //cache all the primary competitors for the particular opportunity
   public void init(){      
    listComptr=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where 
                                 Opportunity__r.Id =:ApexPages.currentPage().getParameters().get('retURL').substring(1,16) AND Primary_Competitor__c=true];     
   }
   
   //method to uncheck the primary competitor for other competitor records     
   @RemoteAction
   public static void checkPrimaryComp(String oppId){              
    Map<Id,Competitor__c> compMap=new Map<Id,Competitor__c>([SELECT Id,Name,Primary_Competitor__c from Competitor__c where Opportunity__r.Id =: 
                                         oppId.substring(1,16)]);     
     for(Competitor__c comp : compMap.values()){         
        comp.Primary_Competitor__c=false;}       
     update compMap.values();      
   }
   
   //invoked to check for the first primary competitor
   @RemoteAction
   public static String checkFirstPrimaryComp(String oppId){
   List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where 
                                 Opportunity__r.Id =:oppId.substring(1,16) AND Primary_Competitor__c=true];
       if(listTemp.size()==0){return 'true';}
       else{return 'false';}   
      
   }
      
   //method invoked on update of Competitor records
   public void onUpdatePrimaryComp(){
   try{
     if(Trigger.IsUpdate && !Trigger.IsInsert && flag==0){
     flag++;
     SET<Id> oppIds=new SET<Id>();          
     for(Sobject sobj: Trigger.new){
        Competitor__c cc1=(Competitor__c)sobj;
        oppIds.add(cc1.Opportunity__c);             
     }       
     List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c,Opportunity__r.Id from Competitor__c where Opportunity__r.Id in : oppIds AND
                               Primary_Competitor__c=true] ;        
     if(listTemp.size()!=0){
         for(Sobject sobj: Trigger.new){
             Competitor__c cc1=(Competitor__c)sobj;
            
             if(cc1.Primary_Competitor__c==true){
                 for(Integer i=0;i<listTemp.size();i++){
                     if(listTemp.get(i).Opportunity__r.Id == cc1.Opportunity__c){
                       listTemp.get(i).Primary_Competitor__c=false;}
                 }
             }
          }       
       update listTemp;}     
     }}
     catch(Exception e){System.debug('==Exception Message==='+e.getMessage());}
   }
   
    //method invoked to save and return to the original Opportunity record Page
    p**ublic PageReference Save(){
      
      Competitor__c comp=new Competitor__c();
      //List<Competitor__c> checklist=new List<Competitor__c>();
      //checklist=[select Competitor_Machine__C,Competitor_Machine_Description__c from Competitor__c];
      
      if (comp.Competitor_Machine__C == 'other' && comp.Competitor_Machine_Description__c == null)
      {
              ApexPages.addMessage( new ApexPages.Message(ApexPages.Severity.ERROR, 'If other is selected please enter a description.') );
          // Return null so the page won't redirect
        return null;**
      }
      try{
      if(ApexPages.currentPage().getParameters().get('Name')!=null)
      {
      
      insert cc;
      }
      else 
      update cc;
      }
      catch(Exception e){}        
      return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
    }
    
    //method is invoked on click of CANCEL button
    public PageReference Cancel(){
    try{
    if(ApexPages.currentPage().getParameters().get('Name')==null){
        if(listComptr.get(0).primary_Competitor__c==false){
            listComptr.get(0).primary_Competitor__c=true;
        }
    }
      update listComptr;
    }
    catch(Exception e){
      System.debug('==Exception Message==='+e.getMessage());
    }
     return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
     
    }
  
  
    
}

Visualforce

<apex:page standardcontroller="Competitor__c" extensions="ctrlCompetitor" language="{!$CurrentPage.parameters.lang}" action="{!init}">
<apex:sectionheader title="{!$ObjectType.Competitor__c.label} Edit" subtitle="{!IF(ISNULL(Competitor__c.name), 'New Competitor',Competitor__c.name)}"/>
function chngPrimComp(cmp,val){
var c; var flag=0; if(cmp.checked==false && flag!=0){
alert('{!$Label.msgCantUnchk}'); cmp.checked=true; flag++; } if(cmp.checked==true && flag==0){
ctrlCompetitor.checkFirstPrimaryComp('{!$CurrentPage.parameters.retURL}',function(result, event){ if(event.status){
if(result=='false'){
c=confirm('{!$Label.msgPrmryCompCnfrm}'); if(c==true){ flag++;
ctrlCompetitor.checkPrimaryComp('{!$CurrentPage.parameters.retURL}',function(result, event){ if(event.status){} if(event.exception){} }); } else if(c==false){ cmp.checked=false; } } }
}); }
} <apex:pageMessages id="mymsg" /> <apex:form >
<apex:pageblock mode="edit" title="{!$ObjectType.Competitor__c.label} Edit"> <apex:pageblockbuttons > <apex:commandButton value="Save" action="{!Save}" />
<apex:commandbutton value="Cancel" action="{!Cancel}"/> </apex:pageblockbuttons> <apex:outputpanel > <apex:pageblocksection title="Information" showheader="true" columns="2"> <apex:inputfield id="oppid" value="{!Competitor__c.Opportunity__c}" required="true"/> <apex:inputfield value="{!Competitor__c.Amount__c}" required="false"/> <apex:inputfield value="{!Competitor__c.Competitor_Name__c}" required="true"/>
<apex:inputfield id="chkbox" value="{!Competitor__c.Primary_Competitor__c}" required="false" onchange="chngPrimComp(this,this.value);" />
<apex:inputfield value="{!Competitor__c.Competitor_Machine__c}" required="false"/>
<apex:pageblocksectionitem /> <apex:inputfield value="{!Competitor__c.Competitor_Machine_Description__c}" required="false"/> <apex:pageblocksectionitem /> </apex:pageblocksection> <apex:pageblocksection title="Competitor Strengths / Weaknesses" showheader="true" columns="2"> <apex:inputfield value="{!Competitor__c.Competitors_Strength__c}" required="false"/> <apex:inputfield value="{!Competitor__c.Competitors_Weakness__c}" required="false"/> <apex:inputfield value="{!Competitor__c.Competitive_Situation__c}" required="false"/> <apex:pageblocksectionitem /> </apex:pageblocksection> <apex:pageblocksection title="System Information" showheader="true" columns="2"> <apex:inputfield value="{!Competitor__c.Name}" required="true"/>
</apex:pageblocksection> </apex:outputpanel> </apex:pageblock>
</apex:form>

</apex:page>

public with sharing class ctrlCompetitor { 

   
    
    public static Integer flag=0; 
   
 public Competitor__c cc{get;set;} 
    public Competitor__c cc1=new Competitor__c(); 
    public List<Competitor__c> listComptr=new List<Competitor__c>();  
    public ctrlCompetitor(){}
           
    //extension invoked to pre-populate the Name parameter
    public ctrlCompetitor(ApexPages.StandardController stdController) {  
     try{
       cc=new Competitor__c();      
       cc = (Competitor__c)stdController.getRecord(); 
       if(ApexPages.currentPage().getParameters().get('Name')!=null)
         cc.Name=ApexPages.currentPage().getParameters().get('Name'); 
     }
     catch(Exception e){System.debug(e.getMessage());}
    }
   
   //cache all the primary competitors for the particular opportunity
   public void init(){      
    listComptr=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where 
                                 Opportunity__r.Id =:ApexPages.currentPage().getParameters().get('retURL').substring(1,16) AND Primary_Competitor__c=true];     
   }
   
   //method to uncheck the primary competitor for other competitor records     
   @RemoteAction
   public static void checkPrimaryComp(String oppId){              
    Map<Id,Competitor__c> compMap=new Map<Id,Competitor__c>([SELECT Id,Name,Primary_Competitor__c from Competitor__c where Opportunity__r.Id =: 
                                         oppId.substring(1,16)]);     
     for(Competitor__c comp : compMap.values()){         
        comp.Primary_Competitor__c=false;}       
     update compMap.values();      
   }
   
   //invoked to check for the first primary competitor
   @RemoteAction
   public static String checkFirstPrimaryComp(String oppId){
   List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where 
                                 Opportunity__r.Id =:oppId.substring(1,16) AND Primary_Competitor__c=true];
       if(listTemp.size()==0){return 'true';}
       else{return 'false';}   
      
   }
      
   //method invoked on update of Competitor records
   public void onUpdatePrimaryComp(){
   try{
     if(Trigger.IsUpdate && !Trigger.IsInsert && flag==0){
     flag++;
     SET<Id> oppIds=new SET<Id>();          
     for(Sobject sobj: Trigger.new){
        Competitor__c cc1=(Competitor__c)sobj;
        oppIds.add(cc1.Opportunity__c);             
     }       
     List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c,Opportunity__r.Id from Competitor__c where Opportunity__r.Id in : oppIds AND
                               Primary_Competitor__c=true] ;        
     if(listTemp.size()!=0){
         for(Sobject sobj: Trigger.new){
             Competitor__c cc1=(Competitor__c)sobj;
            
             if(cc1.Primary_Competitor__c==true){
                 for(Integer i=0;i<listTemp.size();i++){
                     if(listTemp.get(i).Opportunity__r.Id == cc1.Opportunity__c){
                       listTemp.get(i).Primary_Competitor__c=false;}
                 }
             }
          }       
       update listTemp;}     
     }}
     catch(Exception e){System.debug('==Exception Message==='+e.getMessage());}
   }
   
    //method invoked to save and return to the original Opportunity record Page
    public PageReference Save(){
      
      Competitor__c comp=new Competitor__c();
      //List<Competitor__c> checklist=new List<Competitor__c>();
      //checklist=[select Competitor_Machine__C,Competitor_Machine_Description__c from Competitor__c];
      
      if (comp.Competitor_Machine__C == 'other' && comp.Competitor_Machine_Description__c == null)
      {
              ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR,'If other is selected please enter a description');//Same old drama 
ApexPages.addMessage(myMsg);
          // Return null so the page won't redirect
        return null;
      }
      try{
      if(ApexPages.currentPage().getParameters().get('Name')!=null)
      {
      
      insert cc;
      }
      else 
      update cc;
      }
      catch(Exception e){}        
      return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
    }
    
    //method is invoked on click of CANCEL button
    public PageReference Cancel(){
    try{
    if(ApexPages.currentPage().getParameters().get('Name')==null){
        if(listComptr.get(0).primary_Competitor__c==false){
            listComptr.get(0).primary_Competitor__c=true;
        }
    }
      update listComptr;
    }
    catch(Exception e){
      System.debug('==Exception Message==='+e.getMessage());
    }
     return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
     
    }
  
  
    
}

public with sharing class ctrlCompetitor {

public static Integer flag=0; 

public Competitor__c cc{get;set;} public Competitor__c cc1=new Competitor__c(); public List<Competitor__c> listComptr=new List<Competitor__c>();
public ctrlCompetitor(){}

//extension invoked to pre-populate the Name parameter
public ctrlCompetitor(ApexPages.StandardController stdController) {  
 try{
   cc=new Competitor__c();      
   cc = (Competitor__c)stdController.getRecord(); 
   if(ApexPages.currentPage().getParameters().get('Name')!=null)
     cc.Name=ApexPages.currentPage().getParameters().get('Name'); 
 }
 catch(Exception e){System.debug(e.getMessage());}
}

//cache all the primary competitors for the particular opportunity public void init(){
listComptr=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where Opportunity__r.Id =:ApexPages.currentPage().getParameters().get('retURL').substring(1,16) AND Primary_Competitor__c=true];
}

//method to uncheck the primary competitor for other competitor records
@RemoteAction public static void checkPrimaryComp(String oppId){
Map<Id,Competitor__c> compMap=new Map<Id,Competitor__c>([SELECT Id,Name,Primary_Competitor__c from Competitor__c where Opportunity__r.Id =: oppId.substring(1,16)]);
for(Competitor__c comp : compMap.values()){
comp.Primary_Competitor__c=false;}
update compMap.values();
}

//invoked to check for the first primary competitor @RemoteAction public static String checkFirstPrimaryComp(String oppId){ List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where Opportunity__r.Id =:oppId.substring(1,16) AND Primary_Competitor__c=true]; if(listTemp.size()==0){return 'true';} else{return 'false';}

}

//method invoked on update of Competitor records public void onUpdatePrimaryComp(){ try{ if(Trigger.IsUpdate && !Trigger.IsInsert && flag==0){ flag++; SET oppIds=new SET();
for(Sobject sobj: Trigger.new){ Competitor__c cc1=(Competitor__c)sobj; oppIds.add(cc1.Opportunity__c);
}
List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c,Opportunity__r.Id from Competitor__c where Opportunity__r.Id in : oppIds AND Primary_Competitor__c=true] ;
if(listTemp.size()!=0){ for(Sobject sobj: Trigger.new){ Competitor__c cc1=(Competitor__c)sobj;

         if(cc1.Primary_Competitor__c==true){
             for(Integer i=0;i<listTemp.size();i++){
                 if(listTemp.get(i).Opportunity__r.Id == cc1.Opportunity__c){
                   listTemp.get(i).Primary_Competitor__c=false;}
             }
         }
      }       
   update listTemp;}     
 }}
 catch(Exception e){System.debug('==Exception Message==='+e.getMessage());}

}

//method invoked to save and return to the original Opportunity record Page
p**ublic PageReference Save(){
  
  Competitor__c comp=new Competitor__c();
  //List<Competitor__c> checklist=new List<Competitor__c>();
  //checklist=[select Competitor_Machine__C,Competitor_Machine_Description__c from Competitor__c];
  
  if (comp.Competitor_Machine__C == 'other' && comp.Competitor_Machine_Description__c == null)
  {
          ApexPages.addMessage( new ApexPages.Message(ApexPages.Severity.ERROR, 'If other is selected please enter a description.') );
      // Return null so the page won't redirect
    return null;**
  }
  try{
  if(ApexPages.currentPage().getParameters().get('Name')!=null)
  {
  
  insert cc;
  }
  else 
  update cc;
  }
  catch(Exception e){}        
  return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
}

//method is invoked on click of CANCEL button
public PageReference Cancel(){
try{
if(ApexPages.currentPage().getParameters().get('Name')==null){
    if(listComptr.get(0).primary_Competitor__c==false){
        listComptr.get(0).primary_Competitor__c=true;
    }
}
  update listComptr;
}
catch(Exception e){
  System.debug('==Exception Message==='+e.getMessage());
}
 return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
 
}

}

public with sharing class ctrlCompetitor { 

   
    
    public static Integer flag=0; 
   
 public Competitor__c cc{get;set;} 
    public Competitor__c cc1=new Competitor__c(); 
    public List<Competitor__c> listComptr=new List<Competitor__c>();  
    public ctrlCompetitor(){}
           
    //extension invoked to pre-populate the Name parameter
    public ctrlCompetitor(ApexPages.StandardController stdController) {  
     try{
       cc=new Competitor__c();      
       cc = (Competitor__c)stdController.getRecord(); 
       if(ApexPages.currentPage().getParameters().get('Name')!=null)
         cc.Name=ApexPages.currentPage().getParameters().get('Name'); 
     }
     catch(Exception e){System.debug(e.getMessage());}
    }
   
   //cache all the primary competitors for the particular opportunity
   public void init(){      
    listComptr=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where 
                                 Opportunity__r.Id =:ApexPages.currentPage().getParameters().get('retURL').substring(1,16) AND Primary_Competitor__c=true];     
   }
   
   //method to uncheck the primary competitor for other competitor records     
   @RemoteAction
   public static void checkPrimaryComp(String oppId){              
    Map<Id,Competitor__c> compMap=new Map<Id,Competitor__c>([SELECT Id,Name,Primary_Competitor__c from Competitor__c where Opportunity__r.Id =: 
                                         oppId.substring(1,16)]);     
     for(Competitor__c comp : compMap.values()){         
        comp.Primary_Competitor__c=false;}       
     update compMap.values();      
   }
   
   //invoked to check for the first primary competitor
   @RemoteAction
   public static String checkFirstPrimaryComp(String oppId){
   List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c from Competitor__c where 
                                 Opportunity__r.Id =:oppId.substring(1,16) AND Primary_Competitor__c=true];
       if(listTemp.size()==0){return 'true';}
       else{return 'false';}   
      
   }
      
   //method invoked on update of Competitor records
   public void onUpdatePrimaryComp(){
   try{
     if(Trigger.IsUpdate && !Trigger.IsInsert && flag==0){
     flag++;
     SET<Id> oppIds=new SET<Id>();          
     for(Sobject sobj: Trigger.new){
        Competitor__c cc1=(Competitor__c)sobj;
        oppIds.add(cc1.Opportunity__c);             
     }       
     List<Competitor__c> listTemp=[SELECT Id,Name,Primary_Competitor__c,Opportunity__r.Id from Competitor__c where Opportunity__r.Id in : oppIds AND
                               Primary_Competitor__c=true] ;        
     if(listTemp.size()!=0){
         for(Sobject sobj: Trigger.new){
             Competitor__c cc1=(Competitor__c)sobj;
            
             if(cc1.Primary_Competitor__c==true){
                 for(Integer i=0;i<listTemp.size();i++){
                     if(listTemp.get(i).Opportunity__r.Id == cc1.Opportunity__c){
                       listTemp.get(i).Primary_Competitor__c=false;}
                 }
             }
          }       
       update listTemp;}     
     }}
     catch(Exception e){System.debug('==Exception Message==='+e.getMessage());}
   }
   
    //method invoked to save and return to the original Opportunity record Page
    p**ublic PageReference Save(){
      
      Competitor__c comp=new Competitor__c();
      //List<Competitor__c> checklist=new List<Competitor__c>();
      //checklist=[select Competitor_Machine__C,Competitor_Machine_Description__c from Competitor__c];
      
      if (comp.Competitor_Machine__C == 'other' && comp.Competitor_Machine_Description__c == null)
      {
              ApexPages.addMessage( new ApexPages.Message(ApexPages.Severity.ERROR, 'If other is selected please enter a description.') );
          // Return null so the page won't redirect
        return null;**
      }
      try{
      if(ApexPages.currentPage().getParameters().get('Name')!=null)
      {
      
      insert cc;
      }
      else 
      update cc;
      }
      catch(Exception e){}        
      return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
    }
    
    //method is invoked on click of CANCEL button
    public PageReference Cancel(){
    try{
    if(ApexPages.currentPage().getParameters().get('Name')==null){
        if(listComptr.get(0).primary_Competitor__c==false){
            listComptr.get(0).primary_Competitor__c=true;
        }
    }
      update listComptr;
    }
    catch(Exception e){
      System.debug('==Exception Message==='+e.getMessage());
    }
     return new PageReference('/'+ApexPages.currentPage().getParameters().get('retURL').substring(1,16));
     
    }
  
  
    
}