if({!ISBLANK(Challan__c.Accounts_Email_Id__c)})
{
alert('Please Accounts email address');
}
else
{
{!REQUIRESCRIPT("/soap/ajax/16.0/connection.js")} 
{!REQUIRESCRIPT("/soap/ajax/16.0/apex.js")}
var msg =sforce.apex.execute("Send_Challn_To_Accounts","Send_Challn_To_Accounts",{id:"{!Challan__c.Id}"}); window.alert(msg);
}

global class Send_Challn_To_Accounts
{
public static blob b;

    WebService static string Send_Challn_To_Accounts(string id)
    {
     try
     {
              
          Challan__c qt=[Select id,Call_up_order_id__c,Freight_Charge_Applicable_Extra__c,Challan_id__c,Basic_Price_Each_item__c,Basic_Price_per_1000__c,Accounts_Email_Id__c,Sale_Confirmation_Order_ID__c,Account_Id__c,Account_Name__c,Company_Name__c,Account_Name__r.Name,Challan_Number__c,Sale_Confirmation_Order__r.name from Challan__c where id=:id];
        
        
            PageReference pdf =new PageReference('/apex/view_challan_form?scontrolCaching=1&id='+Id);
            
            pdf.setRedirect(true);
           
            if(Test.isRunningTest() == false){

       b = pdf.getContent();
}
        
        //--------create a mail object to send a single email.--------
            Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
         
         string[] toaddress =String.valueOf(qt.Accounts_Email_Id__c).Split(',');

            mail.setToAddresses(toaddress);
          //  mail.setToAddresses(new string[] {qt.email__c}); // Internal_Email_User_Id__c text fied
          
            mail.setBccAddresses(new String[] {'test@globalnest.com'});
            mail.setBccSender(true);
          
        
            mail.setSenderDisplayName(qt.Account_Name__c);
            mail.setSubject('Challan For'+' '+qt.Company_Name__c+' : '+qt.Sale_Confirmation_Order__r.name);
            
        //------------- Create the email attachment-----------------
         Invoice_Dispatch_details__c invoice=new Invoice_Dispatch_details__c();
       //   invoice=[select id,Account_Lookup__c,Purchase_Order__c from Invoice_Dispatch_details__c where Challan__c=:id];
          
            
            Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
            efa.setFileName('Challan.pdf');
            efa.setBody(b);
        //-----------------------------------------------------------
            mail.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});
         
      mail.setPlainTextBody('Hi Accounts Team, Please find the Challan for '+qt.Company_Name__c +' '+'attached to this mail.'+'\n'+'\n'+'\n'+'\n'+'Freight Charge Applicable Extra:'+qt.Freight_Charge_Applicable_Extra__c+'\n'  +'Account Name:'+qt.Company_Name__c+'\n'+'SCO no:'+qt.Sale_Confirmation_Order__r.name+'\n'+'Challan No:'+qt.Challan_Number__c+'\n'+'Basic Price (Each item):'+qt.Basic_Price_Each_item__c+'\n'+'Basic Price (per 1000):'+qt.Basic_Price_per_1000__c+'\n'+'\n'+'Thanks & Regards'+'\n'+'Care Team');
        //------------------------Attach sales order to a contract--------------------
         Attachment formAttach = new Attachment();
         formAttach.Name = 'Challan'+qt.Account_Name__c+'.pdf';
         formAttach.body = b;
         formAttach.ContentType='application/pdf';
         formAttach.parentId =id;
         if (!Test.isRunningTest())
         {
          
           insert formAttach;
         }
        
            //send the email
            Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail } );
           
            return 'Challan has been sent';
        }
        catch(exception ex)
        {
           
          string ex1=string.valueof(ex);
          return ex1;
            
        }

    }
    
}