Question

looping through query values

Asked by: benpung

a little confusing, but here goes.  i have a cfquery that returns several records.  for instance:

select * from tableA;

returns:

ID                   FirstName                       LastName
1                    John                                Miller
2                    Tom                                 Johnson
3                    Billy                                Thompson
4                    Jack                                Smith

So these records appear on my web page in a table.  the ID number is a link that when clicked will bring the user to another web page with that record loaded into a form for editing.  My issue is this.  I need to put a "Next" and "Previous" button on the edit screen so that the user can scroll through the recordset returned by the query without having to hit "back", then clicking the next link.  Can someone give me an idea on how to do this?

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Asked On
2005-05-24 at 05:16:29ID21434639
Tags

through

,

query

,

loop

Topic

ColdFusion Application Server

Participating Experts
2
Points
125
Comments
6

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Answers

 

by: Jester_48Posted on 2005-05-24 at 06:06:03ID: 14067812

on the link have sopmething link this

page?view=query.id&prev=<cfif query.currentRow NEQ 1>#query.id[currentRow-1]#<cfelse>null</cfif>&next=<cfif query.currentRow NEQ query.recordCount>#query.id[currentRow+1]#<cfelse>null</cfif>&startRow=#query.currentRow#

then on teh processing page

<cfoutput query="getInfo" maxrows="#pageReturn#" startrow="#url.startRow#-1">
output prev and next here
</cfoutput>

 

by: benpungPosted on 2005-05-24 at 08:25:16ID: 14069311

i used what you posted to get a start, but i think i want to do this a slightly different way.  on my link page i'm creating a session array that contains all my ID's as follows:

<cflock timeout = "10" scope = "SESSION" type = "Exclusive">
<cfset Session.myarray = ArrayNew(1)>
<cfloop query="GetIncidentDetail">
<cfset Session.myarray[CurrentRow]=Incident_Number>
</cfloop>

i'm then passing the index value of the record the user selects through the URL like this:

<a href="Edit_Incident.cfm?startrow=#GetIncidentDetail.CurrentRow#">#GetIncidentDetail.INCIDENT_NUMBER#</a>

then on my edit page i have a parameter like this:
<cfparam name="URL.StartRow" type="numeric">

then i can set the incident_number of the record i want by going:
<cfset Incident_Number = #Session.MyArray[URL.StartRow]#>

this all works fine.  my issue is coming because  i have a "next" button at the bottom of my form.  when the next button is clicked, i need to submit the form to itself and set incident_Number as follows:

<cfset Incident_Number = #Session.MyArray[URL.StartRow + 1]#>

I need a way to store the current value of the index.  obviously when i do above, i can get to the next record, but not two records down b/c i'm always starting with the start_row and adding 1.  does this make sense?

 

by: trailblazzyr55Posted on 2005-05-24 at 12:52:28ID: 14071952


well you're not defining anything kind of count, just saying basically add 1 to a startrow. you have to give yourself a starting point, something like this would work...

lets say you have your query, you get results..., startrow would then start at the beginning right? so startrow is 1.


<cfscript>
 if (isDefined("URL.StartRow") {
    StartRow = URL.StartRow;
    }else{
    StartRow = 1;
    }
</cfscript>

Now get an index to add to...

<cfparam name="Increment" default="1">

And paging values...

<cfscript>
  if (Increment LT YourQuery.recordcount) {
     nextRec = Increment + 1;
     }else{
     nextRec = Increment;
    }
   if (StartRow GT 1) {
   prevRec = Increment - 1;
   }else{
     prevRec = Increment;
    }
</cfscript>

Now you have four values, something to add, something to subtract, and index, and a startrow...

To use these now on your page with the links, do something like this...

For NEXT >>
<a href="Edit_Incident.cfm?startrow=#nextRec#">NEXT >></a>


For BACK >>
<a href="Edit_Incident.cfm?startrow=#prevRec#">BACK >></a>


Also like the idea you had above, if you want the startrow your record number

do this, except change it to...
<a href="Edit_Incident.cfm?startrow=#GetIncidentDetail.CurrentRow#">#GetIncidentDetail.INCIDENT_NUMBER#</a>

This....
<a href="Edit_Incident.cfm?startrow=#GetIncidentDetail.INCIDENT_NUMBER#">#GetIncidentDetail.INCIDENT_NUMBER#</a>

don't think currentrow's going to help much unless you're trying to associate files in a loop or something or display a list of row numbers.

Also make sure, may sound silly, but to have your cfoutput tags around your links ;o)

~trail

 

by: trailblazzyr55Posted on 2005-05-24 at 12:57:45ID: 14072004

you could do this

actually instead of this...
<cfparam name="Increment" default="1">

combine the two cfscripts and scrap the cfparam like so...

<cfscript>
 if (isDefined("URL.StartRow") {
        StartRow = URL.StartRow;
    }else{
        StartRow = 1;
    }
        Increment = StartRow;

  if (Increment LT YourQuery.recordcount) {
        nextRec = Increment + 1;
     }else{
        nextRec = Increment;
    }
  if (StartRow GT 1) {
        prevRec = Increment - 1;
     }else{
        prevRec = Increment;
    }
</cfscript>

 

by: benpungPosted on 2005-06-29 at 09:36:06ID: 14330406

sorry it took me so long to close this.  i got it working.  thanks.

20120131-EE-VQP-002

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