# Check for children **URL:** \ **Category:** Radiant CMS\ **Created:** [September 24, 2006, 4:49pm UTC](https://www.ruby-forum.com/t/check-for-children/69825 "2006-09-24T16:49:55Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 24, 2006, 4:49pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/1 "2006-09-24T16:49:55Z")
In my base template, I want to output a only if some children of the current page exist. How can I check for children of a page? -- Steven N. http://outerthought.org/ Outerthought Open Source Java & XML stevenn at outerthought.org stevenn at apache.org ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 24, 2006, 5:52pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/2 "2006-09-24T17:52:01Z")
On 24/09/06, Steven N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > In my base template, I want to output a > > only if some children > of the current page exist. How can I check for children of a page? You need to define a new tag like \ that would work like this: - This is explained in more details on the wiki - to which I hope you’ll contribute your experiences with! 🙂 [http://dev.radiantcms.org/radiant/wiki/HowToDefineGlobalTags](http://dev.radiantcms.org/radiant/wiki/HowToDefineGlobalTags) – Regards, Dave ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 24, 2006, 6:52pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/3 "2006-09-24T18:52:09Z")
Dave C. wrote: > - Perhaps, but the children:each tag will only work if children exist. So in a sense it encapsulates the if\_children idea. If you give us a little more context or detail, I might be able to come up with some code that will do the trick. Sean C. [seancribbs.com](http://seancribbs.com) ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 24, 2006, 9:06pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/4 "2006-09-24T21:06:24Z")
On 24 Sep 2006, at 18:49, Sean C. wrote: > exist. So in a sense it encapsulates the if\_children idea. If you > give us a little more context or detail, I might be able to come up > with some code that will do the trick. I have a containing a secondary navigation that should only be inserted when there’s underlying children. Something like: \ ### More information would do the trick. -- Steven N. http://outerthought.org/ Outerthought Open Source Java & XML stevenn at outerthought.org stevenn at apache.org ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 24, 2006, 9:36pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/5 "2006-09-24T21:36:27Z")
On 24 Sep 2006, at 17:50, Dave C. wrote: > \ > > This is explained in more details on the wiki - to which I hope you’ll > contribute your experiences with! 🙂 I added this to my --unpack’ed version of app/models/page\_context.rb : ``` # # ... # # define_tag 'if_children' do |tag| tag.expand if tag.locals.page.has_children? end ``` en that indeed did the trick. No idea however if this is the best way to do this. I can provide a (obviously) very simple patch if people are interested. -- Steven N. http://outerthought.org/ Outerthought Open Source Java & XML stevenn at outerthought.org stevenn at apache.org ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 25, 2006, 7:31am UTC](https://www.ruby-forum.com/t/check-for-children/69825/6 "2006-09-25T07:31:28Z")
On 24 Sep 2006, at 22:24, Dave C. wrote: > If you could provide it as a plugin, that would be awesome! 🙂 Creating a plugin for a two-line patch for a totally trivial addition would be overkill, no? # Index: app/models/page\_context.rb — app/models/page\_context.rb (revision 122) +++ app/models/page\_context.rb (working copy) @@ -40,6 +40,15 @@ end ``` # ``` - # \…\ - # - # Checks for existing children. - # - define\_tag ‘if\_children’ do |tag| - ``` tag.expand if tag.locals.page.has_children? ``` - end - - # # \ # # Renders the total number of children. -- Steven N. http://outerthought.org/ Outerthought Open Source Java & XML stevenn at outerthought.org stevenn at apache.org ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 25, 2006, 1:05pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/7 "2006-09-25T13:05:58Z")
On 25/09/06, Steven N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > On 24 Sep 2006, at 22:24, Dave C. wrote: > > > If you could provide it as a plugin, that would be awesome! 🙂 > > Creating a plugin for a two-line patch for a totally trivial addition > would be overkill, no? Sure, I’m just thinking of people who didn’t install with --unpack that’s all 🙂 – Regards, Dave ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 24, 2006, 10:24pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/8 "2006-09-24T22:24:33Z")
On 24/09/06, Steven N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > en that indeed did the trick. 🙂 > No idea however if this is the best way > to do this. This is exactely the way I have done it. > I can provide a (obviously) very simple patch if people > are interested. If you could provide it as a plugin, that would be awesome! 🙂 – Regards, Dave ---
**Author:** ![Steven\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b9bd4f/32.png) [@Steven\_N](https://www.ruby-forum.com/u/Steven_N)\ **Post date:** [September 25, 2006, 2:42pm UTC](https://www.ruby-forum.com/t/check-for-children/69825/9 "2006-09-25T14:42:13Z")
Actually, there are a score of “global tags” that I’m thinking of collecting and putting into a patch, although most people could put them in a plugin in the meantime like I demonstrated in the How To. Sean C. [seancribbs.com](http://seancribbs.com)