“For” iterates over an array or collection. Several useful variables are available to you within the loop.
{% for item in collection %} {{ forloop.index }}: {{ item.name }} {% endfor %}
{% for item in collection %} <div {% if forloop.first %}class="first"{% endif %}> Item {{ forloop.index }}: {{ item.name }} </div> {% else %} There is nothing in the collection. {% endfor %}
You can also define a limit and offset much like SQL. Remember that offset starts at 0 for the first item.
{% for item in collection limit:5 offset:10 %} {{ item.name }} {% end %} To reverse the for loop simply use {% for item in collection reversed %}
forloop.name |
‘item-collection’ |
forloop.length |
Length of the loop |
forloop.index |
The current item’s position in the collection; forloop.index starts at 1. This is helpful for non-programmers who start believe the first item in an array is 1, not 0. |
forloop.index0 |
The current item’s position in the collection where the first item is 0 |
forloop.rindex |
Number of items remaining in the loop (length - index) where 1 is the last item. |
forloop.rindex0 |
Number of items remaining in the loop where 0 is the last item. |
forloop.first |
Returns true if the item is the first item. |
forloop.last |
Returns true if the item is the last item. |
# File lib/liquid/tags/for.rb, line 49 def initialize(tag_name, markup, tokens) if markup =~ Syntax @variable_name = $1 @collection_name = $2 @name = "#{$1}-#{$2}" @reversed = $3 @attributes = {} markup.scan(TagAttributes) do |key, value| @attributes[key] = value end else raise SyntaxError.new("Syntax Error in 'for loop' - Valid syntax: for [item] in [collection]") end @nodelist = @for_block = [] super end
# File lib/liquid/tags/for.rb, line 72 def render(context) context.registers[:for] ||= Hash.new(0) collection = context[@collection_name] collection = collection.to_a if collection.is_a?(Range) # Maintains Ruby 1.8.7 String#each behaviour on 1.9 return render_else(context) unless iterable?(collection) from = if @attributes['offset'] == 'continue' context.registers[:for][@name].to_i else context[@attributes['offset']].to_i end limit = context[@attributes['limit']] to = limit ? limit.to_i + from : nil segment = Utils.slice_collection_using_each(collection, from, to) return render_else(context) if segment.empty? segment.reverse! if @reversed result = '' length = segment.length # Store our progress through the collection for the continue flag context.registers[:for][@name] = from + segment.length context.stack do segment.each_with_index do |item, index| context[@variable_name] = item context['forloop'] = { 'name' => @name, 'length' => length, 'index' => index + 1, 'index0' => index, 'rindex' => length - index, 'rindex0' => length - index - 1, 'first' => (index == 0), 'last' => (index == length - 1) } result << render_all(@for_block, context) # Handle any interrupts if they exist. if context.has_interrupt? interrupt = context.pop_interrupt break if interrupt.is_a? BreakInterrupt next if interrupt.is_a? ContinueInterrupt end end end result end
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