>1 how to print all menu items…

just put multiple shortcodes on the page

>2. how to use categories navigation without reloading the page?

you’ll need to write some script that does that

alternatively, put all the shortcodes on their own distinct pages and use/find a theme that loads all pages in one go and then just shows/hides whenever the appropriate link is clicked.
i know there are some / have seen some , but off the top off my head i don’t know which one

>there is some filter or loop to change that?
I might be wrong of course, but it sounds to me like you are using option 1 here
https://wordpress.org/plugins/wppizza/installation/
when you might want to consider option 2 perhaps (although this in turn might not suit your scenario. dunno . all depends on how you want to put things together)

having said that – and thinking out loud for a bit – i suppose i could add/amend the shortcode attributes to automatically show all categories which is actually not a bad idea to start off with really to have that option….

>re2:

you will *always* need a parent of some sort (assuming that i understand you correctly)
this is not down to the plugin, but down to wordpress
again, depending on how it’s setup:

the parent can be whatever you like though.

so this will work:

http://www.domain.com/somepagenameslug/pizzas
http://www.domain.com/somepagenameslug/pasta
etc

this:
http://www.domain.com/pizzas
http://www.domain.com/pasta
etc
WILL ONLY WORK IF you create those pages (i.e pizza and pasta) and then put the relevant shortcode on it
(of course in this case you will have to add new pages whenever you create a new category, so it presumably is not an option for you and i’m just saying this here for completeness sake)

i don’t understand the following though (I’m probably missing something):
>to be only #cat name..
the category slug IS the cat name…(unless of course you changed the slug), no ?

although you could mess around with the arguments in the ‘wppizza_filter_loop’ filter, it won’t loop over that page to show you all the headers (i.e. category names) all it would/could do is to show *all* items on one page. so this will only partially be helpful.
(essentially you’d be changing the query , but that doesn’t affect the header)

easiest thing to do – and i wanted to do that for a while anyway but never got round to it – is for me to add the possibility of a shortcode that allows all categories to be displayed , so you dont have to think about it again. might take a couple of days though, depending on what else crops up.

while I’m at it, I might as well also add a class to the headers and articles that references the selected category – probably by id as the navigation has this already as id’s – which should help you in the second scenario when you need to show/hide things

although the navigation widget/shortcode was only meant to be used if you use templates, it should work in your scenario too…..(with a bit of creative js, showing/hiding things depending on class/id)

no worries.
will be fun (and probably useful to others too)
might aven be able to do this by tomorrow (unless unforeseen things crop up), but allow me a few days

i’ll keep you posted (there might be a couple of things you might have to be aware of…will let you know)

in v2.11.2 you now have a number of additional shortcodes to play with

see here: https://wordpress.org/plugins/wppizza/faq/ – > what are the available shortcodes

i have also added a bunch of classes and id’s to the article and header elements.
i.e an article has something like this “wppizza-article-special-offers-16”, where the last integer is the category id , whereas the bit before the id and after wppizza-article- bit is the category slug (so in this case “special-offers”). you’ll probably get the rest from here

one note though: as people might have customised their css using direct selectors somewhere, i cannot hardcode a wrapper div around this , however, there are a couple of filters you can use to add this like so (add the below to your themes functions.php:

/***************
wrap loop in div
with category id added to classname
************/
add_action('wppizza_loop_outside_start', 'le879_wrap_loop_start',10,4);
function le879_wrap_loop_start( $the_query, $options,  $termSlug, $categoryId) {
if($the_query->found_posts>0){/*only add div if >0 posts*/
print"<div class='some-prefix-".$categoryId."'>";/*or use the termslug or whatever*/
}
}
add_action('wppizza_loop_outside_end', 'le879_wrap_loop_end',10,1);
function le879_wrap_loop_end($the_query) {
if($the_query->found_posts>0){/*only add div if >0 posts*/
print"</div>";
}
}

i figure you can work it out from here, but if you have questions just shout

then again, sometimes it is actually quite easy. try v2.11.2.1

(i also edited the filters above to account for that if you need to)