Page 202 - DCAP408_WEB_PROGRAMMING

Web Programming

Notes Finally, _VBScript also allows the Step keyword to modify the interval or step-size of the For-
loop variable.
<%
For I = 1 to 10 Step 2
Response.Write “Number = “ & I & vbCrLf
Next
%>
gives you:

Number = 1
Number = 3
Number = 5
Number = 7
Number = 9
The loop counted I in steps of 2, thus taking on only odd values from the entire set of 10.
For Each Object In Collection ...
The For-Each construct is unique to _VBScript (and its parent, Visual Basic, of course!) It allows
you to iterate through the items in a collection one by one.
<%
For Each Member in Team
Response.Write Member
Next
%>
Here, Team is assumed to be a collection of items. This statement is very useful in scenarios,
where the size of the collection is not known in advance. Using the For Next statement assures
that all items in that collection will be processed, and no “Array Index Out Of Bounds” errors
will be generated.

While ... Wend

Again, here is one of the popular looping constructs of all time.

<%
While Not RS.EOF
Response.Write RS.Fields (“Name”)
RS.MoveNext
Wend
%>
or,
<%
Do While Not RS.EOF
Response.Write RS.Fields (“Name”)
RS.MoveNext

196 LOVELY PROFESSIONAL UNIVERSITY