A nested loop is a loop within a loop.
The first run through of the outer loop triggers the inner loop which loops through until finished. Then the second run through of the outer loop triggers the inner loop again which loops through until finished again. This process will repeat until the outer loop finishes its loop sequence.
The code below has two For Next Loops. Our loop counter variables
OuterLoop and InnerLoop both begin at 1 and end at 3 incrementing by
1 each time they pass through their respective Next Statement.
The first run through of the outer loop triggers the inner loop. The
inner loop runs through from 1 to 3, executing 3 times. The second run
through of the outer loop triggers the inner loop again. This repeats
until the outer loop has passed through 3 times.
<%
'Declare variables
Dim OuterLoop, InnerLoop
For OuterLoop= 1 to 3 ' Our For loop will loop
through from 1 to 3
For InnerLoop = 1 to 3 ' Our
For loop will loop through from 1 to 3
%>
<div><p>
OuterLoop= <%= OuterLoop %> InnerLoop = <%= InnerLoop %>
</p></div>
<%
Next ' increment InnerLoop variable by 1 and
repeat the inner loop
Next ' increment
OuterLoop variable by 1 and repeat the outer loop
%>
Below is the above code in action:
OuterLoop= 1 InnerLoop = 1
OuterLoop= 1 InnerLoop = 2
OuterLoop= 1 InnerLoop = 3
OuterLoop= 2 InnerLoop = 1
OuterLoop= 2 InnerLoop = 2
OuterLoop= 2 InnerLoop = 3
OuterLoop= 3 InnerLoop = 1
OuterLoop= 3 InnerLoop = 2
OuterLoop= 3 InnerLoop = 3
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