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Versions: 17
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Contents
require 'volt/page/bindings/base_binding'
module Volt
class IfBinding < BaseBinding
def initialize(page, target, context, binding_name, branches)
super(page, target, context, binding_name)
getter, template_name = branches[0]
@branches = []
@listeners = []
branches.each do |branch|
getter, template_name = branch
if getter.present?
value = getter
else
# A nil value means this is an unconditional else branch, it
# should always be true
value = true
end
@branches << [value, template_name]
end
@computation = -> { update }.watch!
end
def update
# Find the true branch
true_template = nil
@branches.each do |branch|
value, template_name = branch
if value.is_a?(Proc)
begin
current_value = @context.instance_eval(&value)
rescue => e
Volt.logger.error("IfBinding:#{object_id} error: #{e.inspect}\n" + `value.toString()`)
current_value = false
end
else
current_value = value
end
# TODO: A bug in opal requires us to check == true
if current_value && !current_value.nil? && !current_value.is_a?(Exception)
# This branch is currently true
true_template = template_name
break
end
end
# Change out the template only if the true branch has changed.
if @last_true_template != true_template
@last_true_template = true_template
if @template
@template.remove
@template = nil
end
if true_template
@template = TemplateRenderer.new(@page, @target, @context, binding_name, true_template)
end
end
end
def remove
@computation.stop if @computation
@computation = nil
@template.remove if @template
super
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems