Module:Collapsible list

This module provides a simple, dependency-light way to render a collapsible list in templates and articles. It is designed for use inside infoboxes, sidebars, or documentation where a compact, toggleable list is needed.

Overview

Invoke with:

The module outputs a minimal HTML structure with classes that can be styled via MediaWiki:Common.css. If collapsed=yes is provided, the list is initially hidden (pure-CSS collapse if you style it that way; optional JS can add click-to-toggle).

Parameters

All parameters are optional unless otherwise noted.

title / header

Text to show as the list heading. Use either title= or header=.

collapsed

yes / no. If yes, the list container gets a collapsed class.

1..50

Up to fifty list items. Use positional parameters: 1=, 2=, 3=, etc.

class

Additional CSS classes to append to the outer container.

id

Optional id attribute on the outer container.

list_style

Inline CSS for the ul element. Example: list_style=margin-left:0;

item_style

Inline CSS applied to each li element.

Note: The current minimal implementation guarantees stable output classes:

• chalo-collapsible
• chalo-collapsible-head
• chalo-collapsible-body
• collapsed (toggled by collapsed=yes)

Advanced usage

Add custom classes and styles:

Accessibility notes

• Prefer short, descriptive headings in title=.
• Keep list items concise.
• Do not hide critical information behind collapsed content when it affects article comprehension.

Styling

Add or adjust rules in MediaWiki:Common.css. Example skeleton: .chalo-collapsible { border:1px solid #ddd; margin:.2em 0; } .chalo-collapsible-head { background:#f7f7f7; padding:.3em; cursor:pointer; } .chalo-collapsible-body { padding:.4em .6em; } .chalo-collapsible.collapsed .chalo-collapsible-body { display:none; }

Optional JS click-to-toggle can be bound by targeting .chalo-collapsible-head.

See also

• Module:Collapsible — compatibility shim exposing function name collapsible
• Module:Navbox — for navigation boxes
• Template:Navbox (if used locally)

Errors and troubleshooting

• Script error: The function "collapsible" does not exist

Use

or call

if legacy templates require the old name. Ensure Module:Collapsible exists if using the latter.

Maintenance

This module is intentionally minimal. Extend carefully to avoid adding heavy dependencies. Document any new parameters here.

---

local p = {}

local function yesno(val)
	if type(val) == 'string' then
		val = mw.text.trim(val)
		local lower = mw.ustring.lower(val)
		if lower == 'yes' or lower == 'y' or lower == 'true' or lower == '1' then return true end
		if lower == 'no' or lower == 'n' or lower == 'false' or lower == '0' then return false end
	end
	return val and true or false
end

function p.main(frame)
	local args = frame:getParent() and frame:getParent().args or frame.args
	local title = args.title or args.header or ''
	local list = {}
	for i = 1, 50 do
		local v = args[i]
		if v and v ~= '' then table.insert(list, v) end
	end

	local out = {}
	table.insert(out, '<div class="chalo-collapsible' .. (yesno(args.collapsed) and ' collapsed' or '') .. '">')
	if title ~= '' then
		table.insert(out, '<div class="chalo-collapsible-head">' .. title .. '</div>')
	end
	table.insert(out, '<div class="chalo-collapsible-body"><ul>')
	for _, v in ipairs(list) do
		table.insert(out, '<li>' .. v .. '</li>')
	end
	table.insert(out, '</ul></div></div>')
	return table.concat(out)
end

return p