CategoryTree documentation

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Example of a CategoryTree
Example of a CategoryTree
  1. CategoryTree Documentation

The CategoryTree extension for MediaWiki provides a dynamic, visually appealing way to display the hierarchical structure of categories on a wiki. Unlike the standard category listing, which simply presents a flat list, CategoryTree displays categories in a tree-like format, making it easier for users to navigate and understand the relationships between different topics. This is particularly useful for large wikis with complex category structures. This document provides a comprehensive guide to understanding, configuring, and using the CategoryTree extension. We will explore its features, customization options, and potential applications, drawing parallels where appropriate to concepts relevant in a different, but analytical, domain: binary options trading, to illustrate how understanding hierarchical structure and dynamic relationships applies across disciplines. For example, understanding the 'tree' of market factors influencing a binary options contract's price (economic indicators, news events, technical analysis signals) is similar to navigating a CategoryTree.

Introduction to CategoryTree

CategoryTree essentially transforms the standard category page into an expandable/collapsible tree view. This allows users to quickly see the overall category hierarchy and focus on the specific branches that are relevant to their interests. The extension is written in PHP and relies on standard MediaWiki features like categories and templates. It's designed to be relatively lightweight and doesn't significantly impact wiki performance, even with a large number of categories.

Think of it like this: in technical analysis for binary options, you might start with a broad market trend (the root of the tree) and then drill down into specific indicators (branches) and finally to individual trade setups (leaves). CategoryTree allows a similar flow of information on your wiki.

Installation

Installing CategoryTree is a straightforward process.

1. **Download:** Download the latest version of the extension from the MediaWiki Extensions repository (typically found on GitHub). 2. **Upload:** Upload the `CategoryTree` folder to your wiki's `extensions/` directory. 3. **Configuration:** Add the following line to your `LocalSettings.php` file:

   ```php
   wfLoadExtension( 'CategoryTree' );
   ```

4. **Enable:** Restart your MediaWiki installation to ensure the extension is loaded correctly. This usually involves clearing the cache.

Basic Usage

Once installed, CategoryTree automatically applies to all category pages. No special markup is required to activate it. When a user visits a category page, the extension will automatically generate the tree view. The tree is interactive:

  • **Expand/Collapse:** Users can click on the plus/minus signs next to category names to expand or collapse branches of the tree.
  • **Navigation:** Clicking on a category name takes the user to the corresponding category page.
  • **Subcategory Listing:** Subcategories are displayed indented below their parent categories.
  • **Page Listing:** Pages belonging to a category are displayed indented below the category name.

This is analogous to the branching structure of a candlestick pattern in binary options – the overall pattern (category) is composed of individual candles (pages) that reveal deeper levels of information.

Configuration Options

CategoryTree offers several configuration options that can be customized to control its appearance and behavior. These options are set in your `LocalSettings.php` file.

  • `$wgCategoryTreeMaxDepth`: This variable determines the maximum depth of the tree that will be displayed. Increasing this value allows for deeper category hierarchies to be shown, but can also make the tree more difficult to navigate. Default is 5.
  • `$wgCategoryTreeShowCounts`: This variable determines whether or not the number of pages and subcategories within each category is displayed. Default is `true`. This is similar to displaying trading volume – it provides a quick indication of the strength of a particular category (or trading instrument).
  • `$wgCategoryTreeShowLeaf`: This variable determines whether leaf categories (categories with no subcategories) are displayed. Default is `true`.
  • `$wgCategoryTreeUseCSS`: This variable controls whether the extension uses CSS for styling. Default is `true`.
  • `$wgCategoryTreeCollapseAll`: This variable, when set to `true`, will cause the tree to be initially collapsed when a category page is loaded. Default is `false`.

Templates and Customization

CategoryTree provides several templates that can be used to customize the appearance of the tree. These templates allow you to control the HTML markup generated for each element of the tree. The following templates are available:

  • `Template:CategoryTreeHeader`: Controls the header of the tree.
  • `Template:CategoryTreeCategory`: Controls the rendering of individual categories.
  • `Template:CategoryTreePage`: Controls the rendering of individual pages.
  • `Template:CategoryTreeSubcategory`: Controls the rendering of subcategories.

You can create custom versions of these templates in your wiki to modify the appearance of the tree. For example, you could add custom CSS classes to these templates to apply your own styling.

Consider this like customizing an indicator in binary options trading. You might adjust the colors, line thicknesses, or parameters of an indicator to better suit your trading style. Similarly, you can customize the CategoryTree templates to match your wiki's design.

Advanced Features

  • **Recursive Category Inclusion:** CategoryTree supports recursive category inclusion. This means that if a category is included in another category, the contents of the included category will be displayed in the parent category's tree.
  • **Hidden Categories:** CategoryTree respects hidden categories. Categories that are marked as hidden will not be displayed in the tree.
  • **Templating:** You can use templates within category pages to dynamically generate content that is displayed in the tree.
  • **Filtering:** Implement custom filtering mechanisms to selectively display categories and pages based on specific criteria. (Requires custom PHP code)

Examples of CategoryTree Configuration and Customization

Let's look at some practical examples.

    • Example 1: Limiting Tree Depth**

To limit the maximum depth of the tree to 3 levels, add the following line to your `LocalSettings.php` file:

```php $wgCategoryTreeMaxDepth = 3; ```

    • Example 2: Hiding Page Counts**

To hide the number of pages and subcategories within each category, add the following line to your `LocalSettings.php` file:

```php $wgCategoryTreeShowCounts = false; ```

    • Example 3: Customizing Category Appearance**

To customize the appearance of categories, create a custom template named `Template:CategoryTreeCategory`. For example, the following template would add a custom class to each category:

```wiki

  • {{{category}}}
  • ``` You would then need to define the `custom-category` and `category-name` CSS classes in your wiki's stylesheet. This is analogous to using a specific trading strategy – you define the rules and parameters (CSS classes) to achieve a desired result (visual appearance).

    CategoryTree and Binary Options: A Conceptual Link

    While seemingly disparate, understanding hierarchical structures is crucial in both wiki organization and risk management in binary options trading.

    • **Market Analysis Hierarchy:** Just as CategoryTree organizes wiki content, market analysis involves a hierarchy: fundamental analysis (macroeconomic factors) -> technical analysis (chart patterns, indicators) -> trade setup (specific entry and exit points).
    • **Risk Assessment Tree:** A trader can visualize risk factors as a tree: overall market risk -> specific asset risk -> trade risk (based on the chosen strategy and parameters).
    • **Option Chain Analysis:** Understanding the relationship between different strike prices and expiration dates in an option chain can be viewed as navigating a hierarchical structure.

    Both domains benefit from clear organization and the ability to drill down into specific details. CategoryTree helps organize information, just as a structured trading plan helps organize a trader’s approach.

    Troubleshooting

    • **Tree Not Displaying:** Ensure the extension is properly installed and enabled in your `LocalSettings.php` file. Check the MediaWiki error logs for any errors related to the extension.
    • **Incorrect Tree Structure:** Verify that your categories are correctly defined and that there are no circular category inclusions.
    • **Styling Issues:** Check your custom templates and CSS styles for any errors. Clear your browser cache to ensure that the latest styles are being applied.
    • **Performance Issues:** If you have a very large category structure, consider increasing the `$wgCategoryTreeMaxDepth` value or optimizing your category structure.

    Best Practices

    • **Plan Your Category Structure:** Before creating a large number of categories, carefully plan the overall structure and relationships between them.
    • **Use Descriptive Category Names:** Use clear and descriptive category names that accurately reflect the content they contain.
    • **Avoid Excessive Nesting:** Avoid creating overly deep category hierarchies. This can make it difficult for users to navigate the tree.
    • **Keep Categories Focused:** Each category should have a specific focus. Avoid creating categories that are too broad or too narrow.
    • **Regularly Review and Update:** Regularly review and update your category structure to ensure that it remains accurate and relevant.

    Comparison Table with Standard Category Listing

    CategoryTree vs. Standard Category Listing
    ! Feature !! CategoryTree !! Standard Category Listing Display Format Tree View (Hierarchical) Flat List Navigation Easier, Expand/Collapse More Difficult for Large Categories Visual Appeal More Visually Appealing Basic Complexity Requires Extension Installation Built-in Customization Highly Customizable (Templates) Limited Customization Performance Generally Good, can be optimized Very Good Use Cases Large, Complex Category Structures Small to Medium Category Structures

    Resources and Further Reading



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