Lukelrc wrote:
<select name="txtAvailable" rows="4" id="txtAvailable">
<Script Language = "vbscript" Runat = "Server">
For i = 0 to Count -1
Response.Write"<OPTION>" & ListOfFiles(i) & "</OPTION>"
next
</script></select>
I placed the vbscript in the approprate place in the body. But when i
open the page instead of writing the HTML where i placed the code, it
has appended it right at the bottom of the page. Does anyone know
where i'm going wrong or if there's a better way of doing this?
This is an order-of-execution issue (
http://aspfaq.com/show.asp?id=2045). If
you want to interlace server-side scripting with HTML, you will need <% %>
blocks.
I usually abstract as much processing as possible before writing any HTML.
In your case, I would build a single string to represent the entire array...
FilenameOptionList = CreateOptions(ListOfFiles,"")
....then insert it inline:
<SELECT><%=FilenameOptionList%></SELECT>
You can define the function anywhere in the script, either in <% %> blocks
or in <SCRIPT RUNAT="Server"> blocks. Here is a sample function:
================================================== ======================
Function CreateOptions(byVal A(), byVal DefaultValue)
Dim i, val
For i = 0 To UBound(A)
val = Server.HTMLEncode(A(i))
If A(i) = DefaultValue Then
A(i) = "<OPTION VALUE=""" & val & """ SELECTED>" & _
val & "</OPTION>"
Else
A(i) = "<OPTION VALUE=""" & val & """>" & _
val & "</OPTION>"
End If
Next
CreateOptions = Join(A,vbCrLf)
End Function
------------------------------------------------------------------------
Note that this example is capable of preselecting the control:
... = CreateOptions(ListOfFiles,Request.Form("txtAvailab le").Item)
Lastly, it bears mentioning that in many cases, this abstraction allows you
to simply use <SELECT><%=CreateOptions(...)%></SELECT>
More complicated functions can be written to create OPTION lists from 2D
arrays, wherein the .value and .text properties differ (<OPTION
VALUE="TN">Tennessee</OPTION>). Either way, this type of function is
entirely self-contained, so it can be placed into a common include for reuse
wherever needed.
If you use JScript on the server side, you can even do something like
this...
Array.prototype.toOptions = function(val) {
for (var i=0,a=[]; i<this.length; i++)
a[i] = "\r\n<OPTION VALUE=\"" + this[i] +
(this[i]==val ? "\" SELECTED>" : "\">") +
this[i] + "</OPTION>"
return a.join("")
}
....in which case:
<%=ListOfFiles.toOptions()%>
would suffice, but:
<%=ListOfFiles.toOptions(Request.Form("txtAvailabl e").Item)%>
works even better, and doesn't require a different method signature.
--
Dave Anderson
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