Form handlig with variable elements - asp-classic

Question

I have an html form that has to update contact data. But... each contact has a number of cars with related information viewed as table rows with input cells within the same form. Cars information has to be updated too. The number of cars for each person is not known in advance. How can I handle this in the Server with Request.Form;
Thanks
<form action="#" method="post">
<table>
<tr><td>ID</td><td>INFO1</td><td>INFO2</td><td>INFO3</td></tr>
<%While Not rsVechicles.Eof%>
<tr>
<td><input name="VechicleID" value=<%=rsVechicles("VechicleID")%> /></td>
<td><input name="info1" value=<%=rsVechicles("info1")%> /></td>
<td><input name="info2" value=<%=rsVechicles("info2")%> /></td>
<td><input name="info3" value=<%=rsVechicles("info3")%> /></td>
</tr>
<%rsVechicles.MoveNext%>
<%Wend%>
</table>

Answer 1

You need to have some sort of counter variable to differentiate between the rows. Also, do you really mean for the user to be able to change the vehicle ID?
<%
dim v
v = 0
%>
<form method="post" action="thispage.asp">
<table><tr><th>ID</th><th>Info 1</th><th>Info 2</th><th>Info 3</th></tr>
<%
While Not rsVehicles.EOF
v = v + 1
Response.Write "<tr><td><input type='hidden' name='ID_" & v & "'"
Response.Write " value='" & rsVehicles("VehicleID") & "'>"
Response.Write rsVehicles("VehicleID") & "</td>"
For i = 1 to 3
Response.Write "<td><input type='text' name='Info" & i & "_" & v & "'"
Response.Write " value='" & rsVehicles("Info" & i) & "'></td>"
Next
Response.Write "</tr>"
rsVehicles.Movenext
Wend
Response.Write "<input type='hidden' name='N' value='" & v & "'>"
%>
</table>
Then when you're reading values from the form, you can loop through the same indexes:
v = Request.Form("N") '- number of vehicles
For i = 1 to v
Vehicles(i,0) = Request.Form("ID_" & i)
For j = 1 to 3
Vehicles(i,j) = Request.Form("Info" & j & "_" & i)
Next
Next