Looking at the code in django/template/defaulttags.py, where len_values
is the number of itterations in the loop:
counter0 runs from 0 through len_values-1
counter runs from 1 through len_values
revcounter runs from len_values down to 1 (essentially it is
len_values - counter0)
revcounter0 runs from len_values-1 down to 0 (len_values-counter)
Since you're printing 'and' after you print tag.name, you want to do
it in the penultimate
iteration. At this point revcounter will be 2. That is, counting
this iteration, there are
2 iterations left in the loop. revcounter9 will be 1 at this point,
because there is one
iteration after the current one.
So you can check {% ifequal forloop.revcounter 2 %} or you can check
{% ifequal forloop.revcounter0 1 %}.
By the way, you don't need the forloop last check, as either of the above
automatically don't happen on the last iteration.
An alternative would be to (conditionally) print the "and" before
tag.name in the loop,
where you only have to use last:
...
{% for tag in taglist %%}{% if forloop.last %} and{% endif %} {{
tag.name }}{% endfor %}
And note that {% if forloop.last %} is roughly equivalent to {%
ifequal forloop.revcounter0 0 %} or
{% ifequal forloop.revcounter 1 %}.
To get a better handle on what has which value when, you could sprinkle
some {{ forloop.revcounter }} and {{ forloop.revcounter0 }} instances in your
loop.
Bill
On Tue, Feb 2, 2010 at 4:30 AM, harryos <oswald.ha...@gmail.com> wrote:
> hi
> While trying out lessons on templates.I tried using the variables in
> 'for' to print the names of 2 tags in a list called taglist.(template
> code is given at the bottom)
> I could n't understand why ifequal forloop.revcounter0 1 is used
> instead of revcounter..
> I tried to follow the logic using revcounter variable,
>
> 1st iteration of for:
> print tagname of first tag
> current iteration is not the last
> check if 1 iteration is left ,revcounter should return 1 since 1
> more iter is left,so should print the word 'and'
> 2nd iteration:
> print tagname of second tag
> forloop.last is true,nothing printed
> forloop ends
>
> According to above logic I should be getting the result as
> firsttag and secondtag
> Still ,I got the correct result only when i used ifequal
> forloop.revcounter0 1
>
> Can someone tell me how I got the logic wrong..I am quite confused
> thanks
> harry
>
> {% load tagging_tags %}
> {% tags_for_object object as taglist %}
>
> {% if taglist.count %}
> {{ taglist.count}} Tags for this link are :
> {% for tag in taglist %}
> {{tag.name}}
> {% if forloop.last %} {% else %}
> {% ifequal forloop.revcounter 1 %} and {% else %},{% endifequal %}
> {% endif %}
> {% endfor %}
> {% else %}
> No tags for this link
> {% endif %}
>
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