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data from previous iteration

barneyb

I have an iteration, but in the ith iteration, I need it to get data from the "i-1"th container.

I tried this:
{iw_value name='dcr.offers.panels[i-1].anchor'/}
but not luck.

Thanks in advance

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Adam Stoller

I have an iteration, but in the ith iteration, I need it to get data from the "i-1"th container.

I tried this:
{iw_value name='dcr.offers.panels[i-1].anchor'/}
but not luck.

Thanks in advance

What do you do in the first iteration when there is no -1 iteration to select from? Do you use the last iteration's value? If so, you might be able to something like this in Perl:

<iw_perl>
my @list = iwpt_dcr_list('dcr.offers.panels');
for (my $i = 0; $i < @list; $i++) {
    my $anchor = $list[$i-1]->value('anchor');
    ...
}
</iw_perl>

barneyb

For the first iteration I don't want it to take any value (or don't care what value it takes). I only need it from the 2nd iteration onwards.

nipper

For the first iteration I don't want it to take any value (or don't care what value it takes). I only need it from the 2nd iteration onwards.

Then start with $i = 1; instead of $i = 0;

barneyb

Thanks for this, but I have no idea about perl, so I just pasted in what you gave me, but I get an XML Parse Error. Plese can you help with where I have gone wrong:

[html]

my @list = iwpt_dcr_list('dcr.offers.panels');
for (my $i = 1; $i < @list; $i++) {
my $anchor = $list[$i-1]->value('anchor');
}

<a name="{iw_value name='dcr.offers.panels[anchor].anchor'/}"></a>

[/html]

Adam Stoller

Thanks for this, but I have no idea about perl, so I just pasted in what you gave me, but I get an XML Parse Error. Plese can you help with where I have gone wrong:

[html]

my @list = iwpt_dcr_list('dcr.offers.panels');
for (my $i = 1; $i < @list; $i++) {
my $anchor = $list[$i-1]->value('anchor');
}

<a name="{iw_value name='dcr.offers.panels[anchor].anchor'/}"></a>

[/html]

First - you should never use anything in this forum if you don't understand it.
Secondly - try changing that last line to:

<a name="{iw_value name='$anchor'/}"></a>

and see if that helps. If not, you need to spend more time debugging the entire thing to make sure you understand what you end up with - because ultimately you are going to be responsible for maintaining it.

barneyb

I understand all my code, and its works fine if I just ask it for the ith element, but I just dont understand this perl script to get the [i-1]th element. Please could you explain what it is doing, then I may have a chance of being about to debug it myself.

Thanks

Adam Stoller

I understand all my code, and its works fine if I just ask it for the ith element, but I just dont understand this perl script to get the [i-1]th element. Please could you explain what it is doing, then I may have a chance of being about to debug it myself.

<iw_perl>
my @list = iwpt_dcr_list('dcr.offers.panels');
for (my $i = 0; $i < @list; $i++) {
    my $anchor = $list[$i-1]->value('anchor');
    ...
}
</iw_perl>

After taking a second look at your previous post I now see that you left in the iw_iterate -- the code above was intended to replace the iw_iterate.

I'll change the code a tad bit and add some comments - hopefully this will help you.

my @list = iwpt_dcr_list('dcr.offers.panels');
for (my $i = 0; $i < @list; $i++) {
    ...
}
# The above is essentially identical to:
# <iw_iterate var="i" list='dcr.offers.panels'>
# @list is an array that contains all of the nodes within dcr.offers.panels
# which includes the 'anchor' node you're interested in.
# The array is indexed starting at 0 the '< @list' interprets the array in
# scalar context to return the number of elements in the array
# so if there is only 1 node within the list, it will return '1' and you will
# loop from 0 (the first element) to less-than-1 (which means once through
# the loop) If you have 2 nodes that '< @list' results in 2 and you will loop 
# twice: i = 0 (first element), i = 1 (second element) - and so on.

for (my $i = 0; $i < @list; $i++) {
    if ($i == 0) {
        # do whatever you want with the first element in the list
    }
    else {
        $anchor = $list[$i-1]->value('anchor');
        ...
        iwpt_output(qq(<a name="$anchor"></a>));
        ...
    }
}
# I'm not sure what you want to do with all the information
# in the first iteration through the loop (the 'if' clause), but in all other
# iterations through the loop (where $i > 0) we first get the value of
# the 'anchor' sub-node of $list[$i - 1] (if $i = 1, the second element,
# we get the value of element 0's, the first element, 'anchor' node)
# You then might do some stuff ... and then you output the HTML
# code you wanted ... 
# Note: This is inside the loop and it uses iwpt_output() and the 
# actual perl variable instead of an iw_value statement.
# You then might do some other stuff (?)

Does that help?

You might want to look over perldoc TeamSite:T::iw_perl (also available at http://your-ts-server/iw/help/tst/pt)

If you don't understand Perl, but understand programming, I recommend getting a copy of Programming Perl. If you don't know much about programming you might prefer to start with Learning Perl

barneyb

Excelent - works really nicely. Thanks for that help, and it all makes sence. :-)

What if statement would I need if I want to catch the last case, where i = number of items in the list? I've tried a few things, but to no luck.

Thanks

Adam Stoller

Excelent - works really nicely. Thanks for that help, and it all makes sence. :-)

What if statement would I need if I want to catch the last case, where i = number of items in the list? I've tried a few things, but to no luck.

Thanks