Update a record through custom button - JS PROBLEM

I have a record that currently has Status__c='Draft'
When I click the Start button, i want status to change to 'In Progress'
I have used following JS code to achieve this
{!REQUIRESCRIPT("/soap/ajax/29.0/connection.js")}

var p = new sforce.SObject('Product_Order__c');
p.id = "{!Product_Order__c.Id}";
p.Status__c = "In Progress";
result = sforce.connection.update([p]);
location.reload(true);

But, in Apex Trigger, I want to do some complex stuff when status changes from Draft to In Progress.
In my afterUpdate event, I am hooking on

Product_Order__c newPO = (Product_Order__c)o;
       Product_Order__c oldPO = (Product_Order__c)o;
system.debug(newPO.Status__c);
system.debug(oldPO.Status__c);
       if (newPO.Status__c.equals('In Progress') && newPO.Status__c != oldPO.Status__c)
           newInProgressPO.put (newPO.Id, newPO.RecordType.Name);

However, these two User Debugs show that both old and new statuses are 'In Progress' so my Map is always empty.

Does anybody have any ideas?

March 21, 2017
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Best Answer chosen by Ivana Miserda

Shashikant Sharma
Hi,

Right now both New and old value seems to be assigned same way:

Product_Order__c newPO = (Product_Order__c)o;
Product_Order__c oldPO = (Product_Order__c)o;

Normally to fetch old value we use Trigger.Old or Trigger.OldMap so it is written like
Product_Order__c newPO = (Product_Order__c)o; Product_Order__c oldPO = (Product_Order__c)Trigger.OldMap.get(newPo.Id);
I hope this would resolve your issue, if you still face issues then please share full code.

Thanks

March 21, 2017
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This was selected as the best answer

Ivana Miserda
Oh wow. That was ridiculously stupid of me.

Thank you!

March 21, 2017
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