This is unsolvable in general case, since widgets can be either generated by sidebar calls in arbitrary locations of templates or (rarely) even rendered individually without sidebar.
So for general case at best you can hook into the processes and run some logic at the end of page load.
If you are working on specific bespoke site you can be more flexible. If you know in advance which sidebars are expected to run on page you could try to examine data structures early in the load process.
You don’t provide much context, but my educated guess would be that trying to make global page context conditional on widgets somewhat goes against the whole idea of widgets as contained pieces. If I saw this in the wild my first thought would be that widgets are being over–architectured into a role they are not meant to perform.
Related Posts:
- How Can I Add the “Insert From URL” Tab to a Custom 3.5 Media Uploader?
- How to refresh Theme Customizer after change color inside wpColorPicker?
- How to Remove All Widgets from Dashboard?
- How do I rebind event after widget save
- Randomize widgets displayed in my sidebar [duplicate]
- Calling static method in the Widget Class
- What is the best way to include a widget in a Page?
- Difference between widget form code variables
- How to create a widget that has a submit form in the front end
- Custom shortcode in widget forced to top of widget
- Unfiltered html in widget title not working
- How to process content in a widget? [duplicate]
- How to retrive widget title/data
- Separate backend “Widgets” page for each language
- How Can I Register Menus and Widgets Conditionally Based on Theme Options/Settings?
- How do I embed in a text widget?
- Where (what direcory) are the default WordPress Widget Codes stored?
- check for shortcode in post/pages AND widgets AND template files
- Why can’t I add this feed to the RSS widget?
- WordPress Widget multiple use
- Contact Form in sidebar [closed]
- Display the date before the post title in recent posts widget
- Using Advanced Custom Fields in a widget
- Closest thing to an is_widget() tag?
- Why won’t my custom widget stay in the sidebar after a reload?
- How to “pair” two widgets side by side in one sidebar [closed]
- Custom dashboard widget search box
- Notice: Undefined index: filter in …wp-includes/default-widgets.php on line 382
- Need some help understanding widgets
- Disable widgets on specific posts
- register widget class not written in theme
- Font awesome Icon HTML in widgets disappear on save
- WordPress Plugins won’t save
- Hide widget if user is logged in without plugin
- Toggle option in sidebar widgets
- for class wp_widget, in what order are the member functions called?
- unexpected T_CONSTANT_ENCAPSED_STRING, expecting ‘)’ in widget [closed]
- How can hide widget title if custom widget is empty
- styling back end widget form and enabling multi widget feature
- How to show different widgets on different pages in a user friendly way
- A form in a custom widget
- Block-based Widgets Editor – how to enable a title
- Elementor widgets – conditional controls
- Widgets in home.php redirect to index.php
- How to make a can’t hide widget?
- WordPress Tag Cloud args (font-size) not working since wp update 4.9
- Problem creating an array instance in a widget in 4.4 update
- Redirect to page after a widget form submit
- Widget on the right side of the page overlaps with the left side [closed]
- Where to put custom widget file?
- Shortcode not working in widget
- How to get options of all active widgets ?
- How to pass a special CSS class into widget li
- Show Woocommerce Product “attributes/extra information tab” in widget [closed]
- How to use the widget area to extend the page content?
- Display a widget on a specific type of archive
- Add a specific css to a widget
- Is there a simple way to have a new sidebar for each page?
- Save button is not working on custom widget
- WordPress database error – quick review
- Select two value from meta key and post meta
- My widget not printing before_widgets and after widgets
- Enqueue script only when side widget is used
- wrapper div for widgets not showing with all widgets
- Address automatically generated ids in css [closed]
- Widget page stopped loading
- latest posts-widget displays all posts on archive page but works great anywhere else
- looping widgets to organize bootstrap grids
- How to get class from widget area
- How to change widget’s form color in admin?
- In widget, the value of select field doesn’t get updated, changes after saving
- Removing widget without using unregister_widget
- Text Widget to Show database fields based on post
- Editing Help Section
- SELECT field options disappear when saving widget
- WordPress text filed input only inter value?
- Widget constructor: about $id_base and $options
- Need to delete the sidebar widget area and have the page a full page rather than just have a blank widget area
- Display Login user name in Thim:login Popup widget
- Searching for a one page overview widget
- Adding pagination to my theme [closed]
- Creating a simple button inside of a widget
- Reposition the widget sidebar in Appearance->Widgets
- Hiding the widget meta box in the Appearance->Widget screen
- Stop ‘extends WP_Widget’ displaying the (backend) form, frontend?
- How to add WooCommerce Add to Cart button in widget?
- How to place a widget beside a div/text so that they display as a continuous line
- Editor Widget Role
- How can I build a widget area widget using the built in WordPress functionalities?
- How to Activate WordPress Widgets
- WordPress wiget admin panel
- Filter “widget_comments_args” won’t work
- How to display a widget available for all themes
- How to output built-in widgets with number in range as class?
- widgets in contacts only
- How to create a widget on witch a registered user can create a checklist
- How to hide sidebar widgets in all pages except Hompage?
- Extending Widgets – Exclude # of posts field from Recent Posts Widget
- Can’t edit the widgets sidebar or footer
- Custom dashboard widget – load style only for added widget