To install HotCat, simply go to your [[Special:Preferences|preferences]] and check the ''HotCat'' option in the ''Gadgets'' tab.
Alternatively you can:
Copy the text below and paste it to the bottom of [[Special:Mypage/skin.js| your script]] file:<br><code>importScript('[[MediaWiki:Gadget-HotCat.js]]');</code >
# Save the new script page, and
# Completely refresh your browser by [[Wikipedia:Bypass your cache|bypassing your cache]].
# Done! You will now have + and - signs next to your categories. Clicking these allows for easy editing, removing and changing of categories.
==How to use==
Whenever a page is loaded, HotCat looks for the category bar. If there are visible categories, it adds links to easily remove, change or add categories:
[[File:HotCat enwp Category bar.png|800px|A category bar as modified by HotCat]]
The new links are:
* "(-)" after a category: when clicked, the category is automatically [[#Removing a category|removed]].
* "(±)" after a category: when clicked, an input field to [[#Changing a category|change this category]] is opened.
* "(+)" at the end of the list of categories: when clicked, an input field to [[#Adding a category|add a category]] is opened.
at the front: when clicked, enters [[#Making more than one category change|multi-change mode ]], allowing modifying more than one category.
If HotCat can detect that a certain category is not in the page text itself but was transcluded onto the page from a template or other transclusion, it will ''not'' add these links. Only categories that ''are'' present in the wikitext of the page itself can be modified through HotCat.
Removing a single category ===
To remove a category, simply click the "(-)"-Link next to the category name. If the page does indeed contain this category, HotCat will remove it automatically. It will
#open a new window or tab in your browser with the current page opened for editing,
#''hide'' the whole edit form, so that you cannot edit,
#edit the page to remove the category, and
#save the page.
Changing a category ===
To change a category, click the "(±)"-Link next to the category name. This will open the [[#Input box|input box]] where you can enter a new category name.
=== Adding a category ===
To add a category, click the "(+)"-Link at the end of the category line. This will open the [[#Input box|input box]] where you can enter a new category name.
Input box ===
[[File:HotCat Input Box plain.png|right|The input box of HotCat]]
The input box of HotCat is very simple: a text field to enter the new category name, an indicator icon, and an "OK" and a "Cancel" button.
The indicator icon tells you whether or not the category name you've entered exists. A [[File:P_no.svg|20px]] icon means that there is no such category yet. You can still add the category, but it will show up as a red link, and you should, after having added the category, click that red link and enter a brief description and parent categories to this new category. A [[File:P_yes.svg|20px]] icon shows that there already is a category with the name you've entered.
[[File:HotCat suggestions.png|right|HotCat's input box with a suggestion list]]
When you start typing, HotCat will display a list of suggestions above or below the text input field. Clicking one of these suggestions will copy it into the text field. Double-clicking a suggestion is the same as clicking once and then clicking the "OK" button: HotCat will add the double-clicked suggestion automatically. The suggestion list is populated by the [[#Search engines|search engine]] chosen in the selector between the list and the text input field.
[[File:HotCat suggestions 2.png|right|HotCat's input box with a suggestion list]]