I checked the markup and core WordPress code to find out how it handles categories and came to the conclusion that all the categories are get loaded on page load and at a time either All Categories or Most Used is displayed by manipulating it using jQuery(on mouse click showing and hiding category-pop & category-all div).
In core wordpress file HTML markup for this is saved in /wp-admin/press-this.php file in #taxonomy-category div and jQuery is saved in /wp-admin/js/link.js file following this // category tabs comment.
By referring his you can develop your widget.
Related Posts:
- Add the sidebar/widget editor to the post edit screen?
- Create a Widget Area in the Navigation Bar for the Genesis Theme Framework?
- Using tabs in admin widgets [closed]
- Tabs and Category Widget
- How to add a text widget on the posts admin page?
- Searching for a one page overview widget
- Hiding the widget meta box in the Appearance->Widget screen
- Custom tabs widget don’t work in google chrome, is blocked, do not change the tabs. Why?
- WooCommerce Layered Nav Widget [closed]
- Programmatically add widgets to sidebars
- Text Widget creates a
- Get Widget Instance inside Widget
- WP_Widget deprecated error in WordPress V4.3
- What is the quickest way to make a widget?
- Changes in widget customizer not triggering ‘save and publish’
- Remove before_widget / after_widget content from Wp_Widget_Text
- Insert a span inside widget title to give a different color to the second word
- Remove tabs from media uploader for a CPT
- What is the use case for the “Class” parameter in register_sidebar?
- Add a select box to all widgets
- Big side banners
- How to execute SQL SELECT query and see the results?
- WordPress “include TEMPLATEPATH” or?
- Need help adding additional controls to a custom widget Part 2
- How to add the widgets manually to the sidebar?
- How to check if widget has automatic title
- Display sidebar that created in functions.php
- Create More Widget Holders Like Active Widgets and Inactive Widgets
- Image picker widget
- When you register a sidebar in WordPress, is it possible to choose in what order it appears in the admin
- How to enable “shift-click to edit this widget” functionality on a custom widget?
- Make compatible custom menu widget for Twitter Bootstrap
- WordPress widget args – classname?
- Moving comments section to left of content (Twenty Thirteen)
- Custom Tag Cloud widget missing tags
- How the widget can be run by shortcode
- add widgets to dashboard for easy access for clients?
- Uses Cases for the Calendar Widget
- Wrap all default widget into div tag
- WP_enqueue_script() loads them always in wp_footer()?
- Widgets missing after update
- Help with custom widget options! (saving checkbox option)
- How to filter products using filter products by attribute widget and OR logic between different product attribute types?
- Can you target a widget_class in a register_sidebar?
- Default widgets assignment – isn’t working
- How to add custom widget above admin_footer
- How to create a ‘single’ category widget for woocommerce plugin [closed]
- wp_get_attachment_image() not displaying post images even though wp_get_attachment_url() echo correct urls
- what is the best way to add things to a side bar
- Disable a plugin’s widget
- My Custom Widget does not save in sidebar
- How to add urls in html widget in a gravity form? [closed]
- How to add custom tinymce plugin to new text widget
- What widgets are used on a page? [closed]
- Create Dashboard Widget with form to keep team’s record
- flush_widget_cache is deprecated. Which method should i use instead?
- How not to display an instance of a widget dynamically?
- How to save widget settings on field value change?
- Twenty Twelve Widget Taking Space
- accessing wordpress serialized data outside wp
- How to use variables from widgets in other pages?
- Change number of widget columns in dashboard?
- Customize Widget Navigation
- How do I add a small excerpt of a blog post on my Front Page Recent Posts widget?
- WordPress 5.8 : display new widget
- Determine if a specific Gutenberg block is used on pages/posts
- WordPress 5.8 Beta 3 Widget Block: widget_id is undefined when a widget is placed
- Mobile view: how to remove right/left margin from the specific widgets?
- Elementor or WordPress randomly adds the word “array” to my custom widget
- Widget form not displaying for media widgets in WordPress
- Need to remove a piece of copy that appears to be in a sidebar but doesn’t show up
- How to edit wordpress widgets?
- My theme didn’t appear sidebar area
- How to create sidebar from “scratch”?
- Display current tag archive’s name and description in sidebar
- Render repeatable widget fields properly with Backbone.js
- Show modal only to some roles
- How to update the options table for a widget
- Script in sidebar blocks other widget’s load
- Adding a trinket.io widget to a post
- Why isn’t this widget displaying one of the icons?
- How to show a widget for logged-in users only?
- Can’t output the number 0 in widget
- widget exclude post by custom field
- How to optimize performance without transient?
- Modify the siderbar footer
- How to show a feed that requires user/pass within a sidebar widget?
- How to limit characters in Academica featured posts widget?
- Run an action only when Widget actually instantiated (not just registered)
- My blog has a design issue.
- Call sidebar from a template
- Unique widget id in sidebar
- Taxonomies not showing in WP Dashboard Right Now widget
- trying to Change to wp_register_sidebar_widget
- How to delete Jetpack Widgets from the Widgets page in admin panel [closed]
- How to customize dynamic_sidebar rendering? [closed]
- Widget does not work with WooCommerce enabled
- How to show WordPress Dashboard Widgets on Frontend?
- How can I add a toggle element into an image box element? [closed]
- getBlockVariations(…) is undefined in Widget and Template Part editors but not Post Editor