This plugin gives every widget an extra control field called “Widget logic” that lets you control the pages that the widget will appear on. The text field lets you use WP’s Conditional Tags, or any general PHP code.
PLEASE NOTE The widget logic you introduce is EVAL’d directly. Anyone who has access to edit widget appearance will have the right to add any code, including malicious and possibly destructive functions. There is an optional filter ‘widget_logic_eval_override’ which you can use to bypass the EVAL with your own code if needed. (See Other Notes).
The configuring and options are in the usual widget admin interface.
Aside from logic against your widgets, there are three options added to the foot of the widget admin page (see screenshots).
Use ‘wp_reset_query’ fix — Many features of WP, as well as the many themes and plugins out there, can mess with the conditional tags, such that is_home is NOT true on the home page. This can often be fixed with a quick wp_reset_query() statement just before the widgets are called, and this option puts that in for you rather than having to resort to code editing
Load logic — This option allows you to set the point in the page load at which your widget logic if first checked. Pre v.50 it was when the ‘wp_head’ trigger happened, ie during the creation of the HTML’s HEAD block. Many themes didn’t call wp_head, which was a problem. From v.50 it happens, by default, as early as possible, which is as soon as the plugin loads. You can now specify these ‘late load’ points (in chronological order):
You may need to delay the load if your logic depends on functions defined, eg in the theme functions.php file. Conversely you may want the load early so that the widget count is calculated correctly, eg to show an alternative layour or content when a sidebar has no widgets.
Don’t cache widget logic results — From v .58 the widget logic code should only execute once, but that might cause unexpected results with some themes, so this option is here to turn that behaviour off. (The truth/false of the code will be evaluated every time the sidebars_widgets filter is called.
The text in the ‘Widget logic’ field can be full PHP code and should return ‘true’ when you need the widget to appear. If there is no ‘return’ in the text, an implicit ‘return’ is added to the start and a ‘;’ is added on the end. (This is just to make single statements like is_home() more convenient.)
Make good use of WP’s own conditional tags. You can vary and combine code using:
!(NOT) to reverse the logic, eg
!is_home()is TRUE when this is NOT the home page.
||(OR) to combine conditions.
X OR Yis TRUE when either X is true or Y is true.
&&(AND) to make conditions more specific.
X AND Yis TRUE when both X is true and Y is true.
There are lots of great code examples on the WP forums, and on WP sites across the net. But the WP Codex is also full of good examples to adapt, such as Test if post is in a descendent category.
is_home()— just the main blog page
!is_page('about')— everywhere EXCEPT this specific WP ‘page’
!is_user_logged_in()— shown when a user is not logged in
is_category(array(5,9,10,11))— category page of one of the given category IDs
is_single() && in_category('baked-goods')— single post that’s in the category with this slug
current_user_can('level_10')— admin only widget
strpos($_SERVER['HTTP_REFERER'], "google.com")!=false— widget to show when clicked through from a google search
is_category() && in_array($cat, get_term_children( 5, 'category'))— category page that’s a descendent of category 5
global $post; return (in_array(77,get_post_ancestors($post)));— WP page that is a child of page 77
global $post; return (is_page('home') || ($post->post_parent=="13"));— home page OR the page that’s a child of page 13
Note the extra ‘;’ on the end where there is an explicit ‘return’.
Before the Widget Logic code is evaluated for each widget, the text of the Widget Logic code is passed through this filter. If the filter returns a BOOLEAN result, this is used instead to determine if the widget is visible. Return TRUE for visible.null
wp_reset_queryoption. If your theme performs custom queries before calling the dynamic sidebar this might help.
You have a PHP syntax error in one of your widget’s Widget Logic fields. Review them for errors. You might find it easiest to check by using ‘Export options’ and reading the code there (Though be aware that single and double quotes are escaped with multiple backslash characters.)
If you are having trouble finding the syntax error, a simple troubleshooting method is to use ‘Export options’ to keep a copy and then blank each Widget Logic field in turn until the problem goes. Once you’ve identified the problematic code, you can restore the rest with ‘Import options’.
This is often, not always, fixed by trying the different ‘Load Logic’ options. The ‘after query variables set’ option looks like it might be a better default, try it.
Since v .50 the widget logic code runs such that when dynamic_sidebar is called in a theme’s code it will ‘return false’ if no widgets are present. In such cases many themes are coded to put in some default sidebar text in place of widgets, which is what you are seeing.
Your options, if you want this default sidebar content gone, are to either edit the theme, or as a work around, add an empty text widget (no title, no content) to the end of the sidebar’s widget list.
There is some confusion between the Main Page and the front page. If you want a widget on your ‘front page’ whether that is a static page or a set of posts, use is_front_page(). If it is a page using is_page(x) does not work. If your ‘front page’ is a page and not a series of posts, you can still use is_home() to get widgets on that main posts page (as defined in Admin > Settings > Reading).
I believe this is fixed in 5.7.0. Let me know if that is not the case.
If your theme calls the sidebar after the loop you should find that the wp_reset_query option fixes things. This problem is explained on the is_page codex page.
Take care with your conditional tags. There is both an
is_category tag. One is used to tell if the ‘current’ post is IN a category, and the other is used to tell if the page showing IS for that category (same goes for tags etc). What you want is the case when:
(this page IS category X) OR (this is a single post AND this post is IN category X)
which in proper PHP is:
is_category(X) || (is_single() && in_category(X))
Have a go at it yourself first. Check out the ‘Writing Logic Code’ section under Other Notes.
This is sort of deliberate. I originally wrote it to be as flexible as possible with the thought of writing a drag’n’drop UI at some point. I never got round to it, because (I’m lazy and) I couldn’t make it both look nice and let you fall back to ‘pure code’ (for the possibilities harder to cater for in a UI).
The plugin Widget Context presents a nice UI and has a neat ‘URL matching’ function too.
It might be that your theme performs custom queries before calling the sidebar. Try the
Alternatively you may have not defined your logic tightly enough. For example when the sidebar is being processed, in_category(‘cheese’) will be true if the last post on an archive page is in the ‘cheese’ category.
Tighten up your definitions with PHPs ‘logical AND’ &&, for example:
is_single() && in_category('cheese')
Widget Logic lets you control on which pages widgets appear using WP's conditional tags.View Cart
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