Question

ASP Form then an update

Asked by: Pigdogmonster

Hi,  Thanks for looking at my question - any advice is appreciated :)

I have created a form dynamically from looping through a database i.e... (I have removed the un-important code)

----------------------------------------------START OF CODE -----------------------------------------------------------


varReject_ID =200

Do while NOT oRSceNT14.EOF

varLUReject_Code = oRSceNT14("Reject_Code")
varLUDescription = oRSceNT14("Description")
%>
<tr>
<td><%=varLUDescription%></td>
<td><input type="text" name="Total_Quantity" value="" size="5" maxlength="5"></td>
<td><input type="text" name="Reject_Price" value="" size="6" maxlength="5"></td>

<input type="hidden" name="Reject_Code" value="<%=varLUReject_Code%>">

</tr>
<%
oRSceNT14.movenext
loop
%>
<input type="hidden" name="Reject_ID" value="<%=varReject_ID%>">

----------------------------------------------END OF CODE -----------------------------------------------------------

This will produce a simple form from the database with 2 input fields as you can see above.

My Questions is:-

I would like to update this information from the form is one go.  As you can see, creating the from dymanically is quite easy but but I'm not sure how I can retreive all the data from the form then update it dynamically?

I hope someone can help?

Thanks
PDM

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Asked On
2007-07-03 at 03:22:24ID22672478
Topic

Active Server Pages (ASP)

Participating Experts
1
Points
250
Comments
6

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Answers

 

by: JagCPosted on 2007-07-03 at 04:20:28ID: 19410144

First you need to add a submit button.
Then set the action of the form to be the page you want to process the info.
On the processing page you can use:

sSomething = request.form("FORM_ITEM_ID")

sSomething will now contain the content of the form item you specified as FORM_ITEM_ID. You can update the database with this now as you know what record is to be updated because you also do:

sRejectCode = request.form("Reject_Code")
sRejectID = request.form("Reject_ID")

As one of these seems to be the ID of the record to update, you simply use the appropriate one in the SQL statement.

Once you have the updated info in the database, then use response.redirect back to the display page.

Any more info, just ask :)

 

by: PigdogmonsterPosted on 2007-07-03 at 04:31:44ID: 19410199

Hi Jagc - thanks for the comments :)

I dont think I have explained my question very well (I never seem to put enough detail lol )

As the form elements and inputs are generated via a loop, there could be any number of elements.
I also only want to update the fields that have had a entry in..
See my screen shot image I have taken and this should give you a better idea...

http://www.stupot.co.uk/images/screenshot.jpg

Thanks again

PDM

 

by: JagCPosted on 2007-07-03 at 05:07:02ID: 19410365

Ah I see.

In that case we need to ensure that each text field has a unique ID so we can tell which record it is to update. Try this:

<input type="text" name="RA-<%=varReject_ID%>" value="" size="5" maxlength="5">
<input type="text" name="TQ-<%=varReject_ID%>" value="" size="5" maxlength="5">

This form can now be submitted. But of course we don't know how many text fields there are or what they are called. So we need to loop through all the form elements and get the ones beginning with "RA-" and "TQ-".

So, in your processing page (the one the form submits to) we need to go through the form, grabbing this info and process it. Many would tell you to open the database, then do your loop and execute the update but this means keeping the DB open for longer than neccesary. You could also create a recordset, enter all the info and update the database in one go. Another way is to build up an array of info then loop through that executing an UPDATE for each of them.

As we don't know how many items will be in the form, there is a way to go through the entire form. Try this:

<%
Dim sCurFormElement
For Each sCurFormElement in Request.Form()
  If Left(sCurFormElement, 3) = "RA-" Or Left(sCurFormElement, 3) = "TQ-"  Then
    response.write("<BR>" & sCurFormElement & " = " & request.form(sCurFormElement ))
  End If
Next
%>

This will loop through all of the submitted form items and display the ID of each form Item with an ID beginning with RA- or TQ- and display it's value.
Important: Form items are submitted in no particular order so don't assume that because you created them in some kind of order your processing page will have them in the same order.

It is up to you how you wish to process the info. As I mentioned you can write a recordset, create an array to store the info or open the DB and throw lots of updates at it.
The easiest method is to open the database connection before the loop and whenever you find a form element beginning with RA- or TQ- grab its ID from after the RA- or TQ- and its value and do teh update.

Hope this is enough info. Unfortunately I don't have time at the moment to throw a code example together. But if you get the loop example above working you should be able to see all the form info. You can then use string manipulation (lots of Left, Mid and InStr's :) to get the appropriate info and store it how you wish.

 

by: PigdogmonsterPosted on 2007-07-03 at 05:26:06ID: 19410479

hi Jagc,
That is superb!   This is one area I have never been able to get my head around (producing and then updating a form dynamically).

As this form is not going to be used by very many users at all I think it maybe easiest to open a database connection and update the database that way.

I unfortunatly do not understand how to do this completely,  so if you dont mind, I will complete the code as I think it should be done and maybe you can help if it doesn't work?
If not, I tottally understand and I really appreciate the help and the explanation that you have given me.

Thanks very very much..

PDM

See my next post for my attempt....

 

by: PigdogmonsterPosted on 2007-07-03 at 05:56:59ID: 19410691

Hi Jagc,

Yeah, I'm lost.. hehehe

I have looking at another form and update that I have done before (although different to this) I wondered if it could be doctored to work here...


Function UpdateForms()
                  
dim oRS6
Set oRS6=server.createobject("ADODB.recordset")
oRS6.open "HDTECHNICAL_LOGLIN", "dsn=HDSS;uid=*;pwd=*",1,3
oRS6.Addnew
oRS6.Fields("Ref")=varRef
oRS6.Fields("Type")=varType
oRS6.Fields("Sub_Type")=varSub
oRS6.Fields("DateTime")=varTimeStamp
oRS6.Update
oRS6.Close
set oRS6=nothing
                        
End Function

for i = 1 to request.form("RA-").count
varSub = request.form("TQ-")(i)

UpdateForms()
next

 

by: JagCPosted on 2007-07-03 at 07:04:07ID: 19411219

Did you try the loop I posted? That will give you an idea of the data that is submitted with the form.

I have just thought of another idea which may make processing the data a little easier.

On the page with the form create a hidden field. When looping through your information to display it in the form, append the current ID to a string and when finished assign this string to the value of the hidden field.

Then, in the processing page you can grab this string and convert it to an array. It will then be easy to loop through the array and for each ID grab its value and amount then call your update function.

Just a quick note. I have no idea where I got TQ from :)
Use the following:
RA = Reject Amount
RP = Reject Price

Thought I'd clarify that first :)

<%
Dim sIDList

' Loop going through your info to display
  ' usual display code here. ie any table elements and the text fields for amount and qunatity as mentioned before
  sIDList = sIDList & ITEM_ID     ' where ITEM_ID is the ID of the current item you are displaying
' End loop

' now clean up the string (no trailing commas). As our list will be "id, id, id, " we can add a comma to the end and just remove any double commas
If sIDList<>"" And Not IsNull(sIDList) Then sIDList = Replace (sIDList&"," , ",," , "" )
%>

Stick sIDList in a hidden field.

On the processing page.

<%
Dim sIDList, aIDList
sIDList = request.form("IDList")
aIDList = Split(sIDList, ",")     ' split on a comma by default just good practice to explicitly state the splitting char(s)

' Now loop through the array we just made
Dim iCurItem
Dim iCurID, iCurAmount, iCurPrice

For iCurItem = 0 To UBound(aIDList)
  iCurID = aIDList(iCurItem)
  iCurAmount = request.form("RA-" & iCurID)
  iCurPrice   = request.form("RP-" & iCurID)

  ' Now pass the ID, the quantity and the amoun
  UpdateForms( iCurID ,  iCurAmount , iCurPrice )

Next

%>

The only thing we need to alter now is the function itself so it will use the values passed to it.

try something like:

<%
Function UpdateForms( sRID, sRA, sRP)
 
  ' Connect to the DB
  Dim sConnString
  sConnString = "WHATEVER CONNECTION STRING IS RELEVANT FOR YOUR DB"
  Set objConn = Server.CreateObject("ADODB.Connection")
  objConn.open (sConnString)

      ' Create the SQL to carry out the update
      Dim sqlUpdate
      sqlUpdate = "UPDATE RejectList SET RejectAmount = '"& sRA &"', RejectPrice='"& sRP &"' WHERE RejectID = '"& sRID &"'"
      objConn.execute(sqlUpdate)

  objConn.Close
  Set objConn = nothing
  objConn = null      
End Function
%>

2 things to note:
1. Use the correct connection string where specified above
2. Update the SQL statement to match your databsae structure (the table name etc I put in there were what I would have called em )

A word of advice. Avoid recordsets :) They are clunky, slow, unwieldy. Look for articles on LearnASP and Four Guys from Rolla about "getrows() vs recordsets".
For reading data Getrows is quick, easy and allows quick opening and closing of the database. For updates use ADO to fire a query directly at the database. Dont bother loading a recordset, updating it and writing it back.

Lemme know how it works out.

20120131-EE-VQP-002

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