Question

classic asp; vbscript; 3 drop down lists, Need to populate each based on value choosen in one before

Asked by: dbp427

Hi all I have three drop down lists, First one, Facility is filled with data from Access database using ADO.
After one chooses a Facility then the second one needs to have the Location populated. I can create the SQL and so forth but just need to know where on the form to put it or put some code to fill it. Then Analytes is filled after choosing a Location
Also need to pass all three values to next page using Query strings or session variables.

So the order of filling the drop down lists is
Facility which is filled now,
then Location
Then Analyte which was filled after Facility was chosen.

Hope this makes sense
TIA

<body> 
<%
	
	rtnCompany =Session("Company")
	
	Set fp_conn =  Server.CreateObject("ADODB.Connection")
	Set fp_rs_Facility = Server.CreateObject("ADODB.Recordset")
	Set fp_rs_Analyte = Server.CreateObject("ADODB.Recordset")
	Set fp_rs_Location = Server.CreateObject("ADODB.Recordset")
	
	fp_conn.Open Application("IHDatabase_ConnectionString")
	SQLStringFacility = "SELECT Facility, Company FROM IndustrialHygiene GROUP BY Facility, Company HAVING Company = '" & rtnCompany & "';"
	SQLStringLocation = "SELECT Facility, Location FROM [IH-Results] GROUP BY Facility, Location HAVING (((Facility)='" & Facility & "'));" 
	fp_rs_Facility.Open SQLStringFacility, fp_conn, 1, 3, 1 
	If fp_rs_Facility.recordcount = 0 then
		Response.write "Login Timed out..."%>
		
		<%Reponse.write "Please Logon again"%> 
		<%Response.write "www.ohcnet.com/logon.asp"
		Else
	fp_rs_Facility.movefirst
	End if
%> 
<p><h2>Welcome <%response.write rtnCompany %></h2></p> 
<form Name="Form1" method="POST" action="ih.asp" > 
<select size="1" name="ddSelectFacility" >
      <option selected value="Choose Facility">Choose Facility</option>
      <%TotalFacilities = fp_rs_Facility.RecordCount%> 
      <%do while not fp_rs_Facility.eof%> 
      <option><%=fp_rs_Facility("Facility")%></option>
      <%fp_rs_Facility.movenext%>
      <%loop%>
      </select> Total =&nbsp;<%=TotalFacilities%> <br>
      
      <input type="submit" value="Get Locations" name="btnGetLocations"><p>
		<select size="1" name="ddGetLocations">
		<option selected value="Choose Location">Choose Location</option>
		<option value="MyLoc">MyLoc</option>
		</select> Total = <br>
	<input type="submit" value="Get Analytes" name="btnGetAnalytes"></p>
<p> 
</form>
<%If UCase(Request.ServerVariables("HTTP_METHOD")) = "POST" Then	
	
	Facility = request.form("ddSelectFacility")
	response.write Facility 
%> 
  	<form Name="Aanalyte" method="GET" action="excel.asp">
  	<%
  		' the action above used to be ih-Analyte_Results.asp
  		'response.write "Posted to " & Facility 
  		
	SQLStringAnalytes = "SELECT * FROM AnalytePerProject Where Facility = '" & Facility & "';"
 	'response.write SQLStringAnalytes 
	fp_rs_Analyte.Open SQLStringAnalytes, fp_conn, 1, 3, 1 
	
	if fp_rs_Analyte.RecordCount >0 then
		fp_rs_Analyte.movefirst
		
	%> 
 	
   	<select size="1" name="ddSelectAnalyte">
  	<%do while not fp_rs_Analyte.eof%>
  		<option><%=fp_rs_Analyte("Analyte") %></option>
  		<%fp_rs_Analyte.movenext%>
  	<%loop%>
  	</select> Total = <%=fp_rs_Analyte.recordcount%>
  	</p>
    
		<input type="submit" value="Get Analyte Results" name="btnGetAnalytes">
		<input type="hidden" name="Facility" value="<%=Facility%>">
	</form>
	
  	<%Else%>
  		<%response.write "No Analytes found"%>
<%End if ' end record count > 0 for Analytes%>	 
	<%else
		response.write "not Posted to"
  	end if%> 
		 			
	<%Set fp_rs_Analyte = nothing%>
	<%Set fp_rs_Facility = nothing%>
   	<%Set fp_conn = nothing%>
</body>

                                  
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Asked On
2009-11-06 at 17:37:53ID24879809
Topics

Active Server Pages (ASP)

,

VB Script

Participating Experts
3
Points
125
Comments
11

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Answers

 

by: neeraj523Posted on 2009-11-06 at 17:45:36ID: 25764588

Hello

You need to use AJAX to fill second and third drop downs based on the selected item in first drop dwon..

You can try JQuery which will simplify the usage of AJAX for a biginner..

 

by: b0lsc0ttPosted on 2009-11-06 at 18:33:59ID: 25764742

If you want the 2nd and 3rd fields filled without reloading the page then AJAX, as the expert above said, is what you want.  One of the best explanations and simplest examples I have found on the net is at http://skeymedia.com/classic-asp-and-ajax-tutorial/.  There is also a good explanation on what AJAX is at http://en.wikipedia.org/wiki/Ajax_%28programming%29.  The reference site W3Schools has a good section on AJAX at http://www.w3schools.com/ajax/default.asp.

The example in that first link will provide a good guide for what you want.  If you want another example that uses it a couple of times then let me know (i.e. choose one AJAX fills second, make another choice for second and AJAX fills third).  The first example should be enough.  After that it is ASP (or server script), Javascript, and page stuff.

If you don't mind a reload each time then AJAX isn't needed.  Just let me know and I can provide details.  If you need help using it then please provide what you have so far.  Let me know how this helps.

bol

 

by: sybePosted on 2009-11-06 at 22:30:03ID: 25765201

You don't have to use AJAX even if you want to avoid reloads of the whole page. The alternative is to load all data in a javascript array. What the best solution is, depends on the total amount of data needed and how people will use your page.

The bad thing about AJAX is that it won't remember earlier retrieved values, so it will retrieve the same data from the server over and over again, even if they were retrieved earlier from the same page. That is a needless overload (and slowing the functionality down).

Loading all data at start can also be quite an overhead, especially if users will typically only select very few of them. The page will typically take more time to load, but then is lightning fast (and independent of any calls to the server).











 

by: dbp427Posted on 2009-11-07 at 11:45:50ID: 25767729

Ok I have no idea what AJAX is and I wrote VBscript in the title? so Java Uh NO
I don't mind re loading the page I just need somethign to work.

 

by: dbp427Posted on 2009-11-09 at 06:36:05ID: 25776228

after a weekend of consideration. O

OK  so if I use AJAX? what needs to be loaded on the WEB server? the site is hosted by our ISP a small company. the site is on a Windows server with front page extensions and ASP.NET 2.xxx

 

by: dbp427Posted on 2009-11-09 at 07:19:32ID: 25776611

I found out that the IPS does not have AJAX support on that server since its running Windows?

 

by: sybePosted on 2009-11-09 at 07:29:08ID: 25776711

AJAX is nothing special and does not need any support on the server, other than other webpages.

 

by: b0lsc0ttPosted on 2009-11-09 at 09:42:57ID: 25778148

In my comment I provided info on AJAX.  I believe you meant ISP instead of IPS and that is a little scary the tech didn't know what AJAX is and would provide such a silly response.  Any server language will work; the main part is done on the clientside using Javascript.

If you don't care about the reload then make the form into 3 pages or steps (or maybe 4 when it is all done).  The steps could all be in one ASP page if you use an If or Select and use something to keep track of the step (i.e. the URL's query string).  The first load would just show the first drop down list.  When selected it submits to the same URL (if all steps are on one ASP page) but then has ?step=2 (or something like it) in the URL.  Your ASP would look for the "step" in the URL (e.g. Request.Querystring("step")).  A Select Case may even be better than an If since you will have a few steps.

This would be the most basic way to do it and would avoid requiring Javascript.  The benefit of no Javascript is your page doesn't depend on the browser supporting it or the user allowing it.  Everything is done by the server.

Let me know if you have a question about this or need more info.

bol

 

by: b0lsc0ttPosted on 2009-12-07 at 11:22:35ID: 25991924

I recommend closing this by accepting the comment at http:#a25764742 .  It has details on the method to use to do what the asker wants and even code to show how it is basically done.  It would need to be adapted as the user needed but is a complete solution for how it is done.

A split would even be fine too.  The other expert's comments did add to this and we both responded to the follow up the asker posted.  It is worth keeping and the asker did get a solution, for as much as he provided and asked.

bol

20120131-EE-VQP-002

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