Module:FFSelect

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<select name="selectFrut" id="selectme">{{#invoke:FFSelect|select
|options=apple>>>appel;pear>>>peer;banana>>>banaan
|labelled=true
|selected=pear
|sep=;
|id=selectme
}}</select>

Lua-fout: bad argument #1 to 'len' (string expected, got nil).

---

local p = {}

--[[

{{#invoke:FFSelect
|selected=pear
|options=apple, pear, banana
|optionlabels=apple--apple; pear--pear; banana--banana
|sep=;
|id=
}}

<select id={id} >
  <option for={id} >
</select>

]]--
p.select = function(frame)
	--local allValues = frame.args.values or "" --all possible values?
	local options = frame.args.options or {}
	local labelled = frame.args.labelled or 'false'
	if labelled == 'true' then
		isLabelled = true
	else 
		isLabelled = false
	end
	local sep = frame.args.sep or ','

	local selected = frame.args.selected or ''
	selected = mw.text.trim( selected )
	id = frame.args.id or "randomidhere"
	
	local optionsTable = mw.text.split( options, sep )
	
	optionElements = {}
	for k,v in ipairs( optionsTable ) do
			if isLabelled == true then
				-- pair of value and label
				local pair = mw.text.split( val, "--" )
				local val = mw.text.trim( pair[0] )
				local label = pair[1] or val
			else
				-- no special label
				local val = mw.text.trim(val)
				local label = val
			end
			
			if val == selected then
				isSelected = true
			else
				isSelected = false
			end
			optionElements[k] = p.createSelectOption( frame, val, label, id, isSelected )
	end

	local res = table.concat( optionElements, "" )
	return res
end

--[[
]]--
p.createSelectOption = function( frame, val, label, id, isSelected )
	local attribs = {
		value = mw.text.trim(val)
	}
	attribs["for%s"] = id -- 'for' has special meaning
	if ( isSelected == true  ) then
		attribs['selected'] = 'selected'
	end
	local res = frame:extensionTag( 'option', label, attribs );
	return res
end

return p