Question

Next N Function - Paging

Asked by: jturkington

Having a few issues trying to get my paging solution a little sleaker. What i am trying to accomplish is making the page links display 5 links left and right of the currently viewed page link eg..

<< 5 6 7 8 9 [10] 11 12 13 14 15 >>

Blow is my current NEXTN function which i use: -

<cffunction name="nextN"
      displayname="Next-N Method"
      hint="Returns a structure containing row (next/back/end/totalrows)"
      access="public"
      returntype="struct"
      output="false">

      <cfargument name="rowsPerPage" type="numeric" required="no" default="10">
      <cfargument name="startRow" type="numeric" required="no" default="1">
      <cfargument name="qryRecordCount" type="numeric" required="yes">
      <cfargument name="cgiRequestMethod" type="string" required="yes">

      
      <cfset var nextN = structnew()>

      
      <cfset nextN.rowsPerPage = arguments.rowsPerPage>

      
      <cfset nextN.startRow = arguments.startRow>

      
      <cfif NOT CompareNoCase(arguments.cgiRequestMethod,"post")>
       <cfset nextN.startRow = 1>
      </cfif>

      
      <cfset nextN.totalRows = arguments.qryRecordCount>

      
      <cfset nextN.endRow = Min(nextN.startRow + nextN.rowsPerPage - 1, nextN.totalRows)>

      
      <cfset nextN.startRowNext = nextN.endRow + 1>

      
      <cfset nextN.startRowBack = nextN.startRow - nextN.rowsPerPage>

      <cfreturn nextN>
</cffunction>

Example of current page links: -

<div class="pagination">
<cfoutput>

<cfset ThisPage = 1>
Page


<cfif nextN.startRowBack GT 0>
<a href="#cgi.script_name#?startrow=#nextN.startRowBack#&orderby=#url.orderBy#&order=#url.order#&#variables.urlString#" title="Back #nextN.rowsPerPage# records" tabindex="7">
<span>«</span>
</a>
</cfif>


<cfloop from="1" to="#nextN.totalRows#" step="#nextN.rowsPerPage#" index="pageRow">

<cfset IsCurrentPage = (pageRow gte nextN.startRow) AND (pageRow lte nextN.endRow)>


<cfif IsCurrentPage>
<b>#thisPage#</b>
<cfelse>

<a href="#cgi.script_name#?startrow=#pageRow#&orderby=#url.orderBy#&order=#url.order#&#variables.urlString#" tabindex="6">#thisPage#</a>
</cfif>


<cfset thisPage = thisPage + 1>
</cfloop>


<cfif nextN.startRowNext LTE nextN.totalRows>
<a href="#cgi.script_name#?startrow=#nextN.startRowNext#&orderby=#url.orderBy#&order=#url.order#&#variables.urlString#" title="Next #nextN.rowsPerPage# records" tabindex="8">
<span>»</span>
</a>
</cfif>
</cfoutput>
</div>

Thanks

Jonathan

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Asked On: 2008-09-18 at 14:07:42ID23744014
Tags: coldfusion
Topics: Cold Fusion Markup Language
,; ColdFusion Application Server
Participating Experts: 1
Points: 500
Comments: 7

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Answers

by: gdemariaPosted on 2008-09-19 at 10:41:25ID: 22523563

what are the issues?
I am curious why you are looping through row numbers at the bottom when it seems you just need to loop through the pages 1..2...3

<cfloop index="pageNo" from="1" to ="#totalPages#">

by: jturkingtonPosted on 2008-09-19 at 13:05:06ID: 22524992

There are no issues, just want to visually improve the page links display. You can imagine if 20000 recordcount is returned and using the above function this can produce alot of page links !!

Dont worry im not returning all 20000 records, using a stored procedure with a CTE expression to bring back the currently displayed x records...........

Thanks for the loop tip...

Any ideas on how to improve the page links display ??

Jonathan

by: gdemariaPosted on 2008-09-19 at 13:13:41ID: 22525083

Oh, so you're goal is just to clean up the pagination display... right?

Typically, you would cut out the middle pages, always show page 1 and always show the last page, then show the 3 pages that are on either side of your current page number. Add ... where you skip pages.

In this example, you're on page 7 out of 195..

1 ... 4 5 6 [7] 8 9 10 ... 195

by: jturkingtonPosted on 2008-09-21 at 05:39:53ID: 22534200

Do you have any sample code for performing this ?, what way do you perform pagination within coldfusion do you have a generic function to handle this ?

by: gdemariaPosted on 2008-09-21 at 09:37:43ID: 22535215

Here's a general start.. needs some tweaking..

<cfset offset = 3>
<cfif max(currentPage-offset,1) gt 1>
<a href="#cgi.script_name#?page=1">1</a> ..
</cfif>
<cfloop index="kk" from="#max(currentPage-offset,1)#" to="#max(currentPage+offset,LastPage)#">
<a href="#cgi.script_name#?page=#kk#">#kk#</a>
</cfloop>
<cfif max(currentPage+offset,LastPage) lt lastPage>
<a href="#cgi.script_name#?page=#lastPage#">#lastPage#</a>
</cfif>

by: gdemariaPosted on 2008-09-21 at 09:41:14ID: 22535224

Here's an example of one pagination routine I use.

Note that I make all calculations based on page number and page size, after that I figure out which records to display based on these main factors.

This algorithm works my fetching all primary keys from the table. This will give you a pointer to all records, and you will know their order and the number in total. Use this information with the current page number to get the primary keys for only the page being displayed. Use the primary keys to fetch the details for that page's records and display them.

<!--- get the page number from the URL or form variable, otherwise, start at 1 ---->
<cfif isDefined('url.page') and val(url.page)>
  <cfset variables.pageNumber = url.page>
<cfelseif isDefined('form.page') and val(form.page)>
  <cfset variables.pageNumber = form.page>
<cfelse>
  <cfset variables.pageNumber = 1>
</cfif>
 
 
<cfset variables.items_per_page = 25> <!---- define how many records to show on a page ---->
 
<!--- this query fetches ALL records that match the criteria,
      alter this query with the correct where clause and order by 
      to get the right records in the right order. 
      To Keep the fetch small, we get ONLY the ID from this query
       --------->
<cfquery NAME="AllRecords" DATASOURCE="#request.datasource#">
  select ID --- fetch only the ID
  from MyTable
  where someFields = #variables.fitler#
  and   otherFields = #variables.otherFields#
  ORDER BY WHATEVER
</cfquery>
 
<!--- do a little math to figure out the max number of pages ---->
<cfset variables.numberOfPages = ceiling(AllRecords.recordCount / variables.items_per_page)>
 
<!---- make sure the page number requested is within the range of pages that we have ---->
<cfif variables.PageNumber le 0> <!---- if page number is too low, set it to first page --->
    <cfset variables.PageNumber = 1>
<cfelseif variables.pageNumber gt AllRecords.recordCount>  <!--- if page number passed is too high, set it to last page ---->
    <cfset variables.PageNumber = variables.numberOfPages>
</cfif>
<!---- based on the page number and number of items on a page, determine the start and end record for the page ---->
<!---- for example, page 3 with 25 items per page will show records 51 through 75, page 1 shows records 1-25 ---->
<cfset variables.startRecord   = ((variables.PageNumber - 1) * variables.items_per_page) + 1>
<cfset variables.endRecord     = variables.startRecord + items_per_page - 1>
 
 
<!---- Now we have the starting record number and the ending one, 
         so we are going to build a little list of the IDs for those records.
         If we show page 3, we will get the ID for records 51 through 76 ----->
<cfset variables.PageIDList = "">
<cfloop index="ii" from="#variables.startRecord#" to="#variables.endRecord#">
  <cfset variables.PageIDList = listAppend(variables.PageIDList, AllRecords['ID'][ii])>
</cfloop>
 
<!----- pageIDList now holds a list of IDS; such as 56,12,98,45,12,5,8, etc.
          These IDs are the IDs we need for this page.  Now fetch again to grab
          all the data we need about these;  So we SELECT * FROM... 
          Be sure to use the Same ORDER BY Clause as in AllRecords Query --------->
<cfquery NAME="thisPage" DATASOURCE="#request.datasource#">
  select * 
  from MyTable
  where ID in (#variables.PageIDList#)
  ORDER BY WHATEVER
</cfquery>
 
 
<!---- now you have the records you need for this page, use the thisPage
       query in a simple cfoutput to display the records ---->
<cfoutput query="thisPage">
 #thisPage.column1# #thisPage.column2# #thisPage.column3#<br>
</cfoutput>
 
<!---- now show the page list ---->
<cfloop index="ii" from="1" to="#variables.numberOfPages">
  <cfif variables.PageNumber is ii>
   #ii#
  <cfelse>
   <a href="/index.cfm?page=#ii#">#ii#</A>
  </cfif>
</cfloop>

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by: jturkingtonPosted on 2008-09-24 at 01:20:07ID: 22557721

Thanks gdemaria for the help, tweaked the pagination display added a few mins instead of maxs: -

<cfif max(nextN.currentPageNo-nextN.pageNoOffset,1) gt 1>
<a href="#cgi.script_name#?page=1">1</a> ..
</cfif>


<cfloop index="pageNo" from="#max(nextN.currentPageNo-nextN.pageNoOffset,1)#" to="#min(nextN.currentPageNo+nextN.pageNoOffset,nextN.noOfPages)#">
<cfif nextN.currentPageNo is pageNo>
#pageNo#
<cfelse>
<a href="#cgi.script_name#?page=#pageNo#">#pageNo#</a>
</cfif>
</cfloop>


<cfif min(nextN.currentPageNo+nextN.pageNoOffset,nextN.noOfPages) lt nextN.noOfPages>
.. <a href="#cgi.script_name#?page=#nextN.noOfPages#">#nextN.noOfPages#</a>
</cfif>


<cfif nextN.nextPageNo lte nextN.noOfPages>
<a href="#cgi.script_name#?page=#nextN.nextPageNo#&#variables.urlString#" title="Next #nextN.rowsPerPage# records" tabindex="8">
<span>»</span>
</a>
</cfif>

Thanks again

Jonathan

20120131-EE-VQP-002

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Next N Function - Paging

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coldfusion

Cold Fusion Markup Language

ColdFusion Application Server

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