Solved

how do you calculate the last page of results in a list

Posted on 2010-08-27
2
394 Views
Last Modified: 2012-05-10
I'm trying to calculate the first and last page of records in a list.  For example, if the returned list contained 100 records and page could display 10 records per page, I am trying to create a method to grab the first 10 records for a link that would take the user to the first 10 records in the list and then another link "last" that would take the user to the last 10 records in the list.

I have an existing method that takes the user to the next and previous set of records (see code below).  How can I get the first and last pages?

This relates to Salesforce apex programming, but I'm asking in the .net and c# zones because the logic should be similar.

Thanks for any help.
/* getlistContact returns the list of Contacts upto 10 per page implementing pagination*/    
    Public List<Contact> getlistContact()
    {
      return contactList_Next ;
    }
    
    /*  Previous method has the logic for displaying the list of Next contacts from Contact object implementing pagination*/ 
    Public void Next()
    { 
        try
        {
            showprev = true;
            contactList_Next.clear();
            Integer limit1 = 0;
  
            if(next+countPerPage < contactList.size())
                limit1 = next+countPerPage;
            else
            {
                limit1 = contactList.size();
                shownext = false;
            }
                
            for(Integer i=next; i<limit1; i++)
            contactList_Next.add(contactList[i]);
    
            Next+=countPerPage;
            
        }catch(Exception e){system.debug('Exception :'+e);}
    }
    
  /*  Previous method has the logic for displaying the list of previous contacts from Contact object implementing pagination*/    
    Public void Prev()
    {
        try
        {
            shownext = true;
            contactList_Next.clear();
            Integer limit1 = 0;        
            if(next-(countPerPage+countPerPage) > 0)
                limit1 = next-countPerPage;
            else
            {
                limit1 = next-countPerPage; 
                showprev = false;
            }
    
            for(Integer i=next-(countPerPage+countPerPage); i<limit1; i++)    
            contactList_Next.add(contactList[i]);
            Next-=countPerPage; 
        }catch(Exception e){
          system.debug('Exception :'+e);
        }               
    }

Open in new window

0
Comment
Question by:-Dman100-
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 6

Accepted Solution

by:
DalHorinek earned 250 total points
ID: 33544909
If you want last 10 items in a list, then do this in pseudocode

limit = 10;
list_size = list.size(); // size of the list
index = list_size - limit -1 // index where to start (size of the list - limit and -1 (cuz indexing starts at zero, we know)

result = new List; // new list
for (i = index; i != list_size; i++)
      result.push(list[i]); // push last 10 items into new list

return result; // return it

But I'm not sure If I have understood correctly.
0
 
LVL 16

Assisted Solution

by:SriVaddadi
SriVaddadi earned 250 total points
ID: 33545018

Add "using System.Linq;"

Below code gives you the last 10 records

  List<Contact> list = new List<Contact>();
            Contact[] lastPage = new Contact[10];
            list.CopyTo(list.Count-10, lastPage, 0, 10);
            List<Contact> lastPageList = lastPage.ToList<Contact>();
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A quick way to get a menu to work on our website, is using the Menu control and assign it to a web.sitemap using SiteMapDataSource. Example of web.sitemap file: (CODE) Sample code to add to the page menu: (CODE) Running the application, we wi…
Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question