Second SELECT-box doesn't show the selected value as SELECTED
Hi!
I usually find what I look for in the other threads, but now I've spent two weeks searching and I still can't work this out, even though I'm sure the solution is easy:(
Why doesn't my second dropdown-list show the selected value Arb (which shows in the url-window as for example myPage.asp?Ar=1976&Arb=1987) as selected? It manages to use the Ar-variable for the first SELECT-box, but the second box always has the first querystring-value selected, as if Arb="". I've also tried using a second sql-query, doing exactly as with the first SELECT-box, without success.
Is it because I'm using the same request.querystring twice? This is my simplified code:
============================================
<%Dim conn, rs, sql, Ar, Arb
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open(Server.Mappath("myDB.mdb"))
set rs=Server.CreateObject("ADODB.recordset")
sql="SELECT DISTINCT Ar FROM myTable ORDER BY Ar"
rs.Open sql,conn
Ar=request.querystring("Ar")
%>
<form method="get">
<select name="Ar">
<%
do until rs.EOF
response.write "<option"
if rs.fields("Ar")=Ar then
response.write " selected"
end if
response.write ">"
response.write rs.fields("Ar")
rs.MoveNext
loop
%>
</select>
<%
if Ar="" then
%>
<input type="submit" value="Start">
</form>
<%
else
%>
<select name="Arb">
<%
rs.MoveFirst
do until rs.EOF
response.write "<option"
if rs.fields("Ar")=Arb then
response.write " selected"
end if
response.write ">"
response.write rs.fields("Ar")
rs.MoveNext
loop
%>
</select>
<%
if Arb="" then
%>
<input type="submit" value="End">
</form>
<%
rs.close
conn.Close
set rs=Nothing
set conn=Nothing
End If
End If
%>
=========================================
Thanx
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mliungman
8/14/2003 8:27:55 PM
asp.net.web-forms
93655 articles. 
6 followers.
7 Replies
905 Views
Doesn't look like you ever set the Arb variable. Try adding Arb=Request.QueryString("Arb") to see if that works.
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racheli
8/14/2003 8:39:33 PM
I can't set Arb=request.querystring("Arb") since there is no Arb-column in the database. I'm using the data in the Ar-column twice since it contains years and I'm trying to choose a Startyear and a Endyear. From there I want to show the data BETWEEN these years.
Or have I misunderstood the request.querystring-syntax?
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mliungman
8/20/2003 8:59:18 PM
Request.QueryString() isn't related to the columns in your database. Since you have Ar=Request.QueryString("Ar") I was assuming you were passing in the values you wanted Ar and Arb to be in your querystring like this (or something close to this): webform1.aspx?ar=1990&arb=2005. In this case, Arb=Request.QueryString("Arb") will set Arb=2005.
Another thing you could try just to see if your code to create the second option tag is working, is just set Arb="2005" or whatever year you want at the beginning of your code.
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racheli
8/20/2003 11:09:37 PM
You are quite right! I misunderstood the syntax... I tried setting Arb=request.querystring("Arb") just after replying to your post, and it worked.
Now I'm trying to filter out distinct years from my database with dates in one column. Any suggestions? One solution that works is to insert a YEAR-column in the database and then use DISTINCT in the sql-statement, but I would like to minimize the database as much as possible. Is it possible to use DISTINCT when filtering the recordset, or to search only the year-part of the date in the database?
Thanks for the help so far!
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mliungman
8/21/2003 9:07:50 PM
This should get you what you want:
SELECT DISTINCT DATEPART(year, Ar) as aryear FROM myTable ORDER BY aryear
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racheli
8/21/2003 10:22:38 PM
Exactly what I was looking for! However, I get the following errormessage (translated from Swedish):
Microsoft JET Database Engine (0x80004005)
The ORDER BY-instruction (Datum) ..."doesn't work with"...DISTINCT.
The web tells me that 0x80004005 is an access-error, but I can read the rest of the database. When searching the web I find this on MSDN Microsofts site. Not sure how it helps me though...
Syntax
[ ORDER BY { order_by_expression [ ASC | DESC ] } [ ,...n] ]
Arguments
order_by_expression
Specifies a column on which to sort. A sort column can be specified as a name or column alias (which can be qualified by the table or view name), an expression, or a nonnegative integer representing the position of the name, alias, or expression in select list.
Multiple sort columns can be specified. The sequence of the sort columns in the ORDER BY clause defines the organization of the sorted result set.
The ORDER BY clause can include items not appearing in the select list. However, if SELECT DISTINCT is specified, or if the SELECT statement contains a UNION operator, the sort columns must appear in the select list.
Furthermore, when the SELECT statement includes a UNION operator, the column names or column aliases must be those specified in the first select list.
Any suggestions?
Thanks for the great help so far!
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mliungman
8/23/2003 10:04:30 PM
Just wanted to finish this thread.
I used SELECT DISTINCT LEFT(Date,4) instead, and it works fine. It seems I couldn't use the DATEPART statement. I don't know why. I also use YEAR later on in my code, it's just the DATEPART I never managed to understand completely.
It's a good thing that there are many ways to achieve the same goal!
Martin
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mliungman
11/30/2003 6:50:21 PM
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