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Contents
# :trigger_id - question that controls the state of the dependent pages/questions
# :expresion - a single expression for eval() by both Javascript and Ruby
# i.e. "answer == 'yes'"
# a question can have more than one answer (choose many) in which case ANY answer will do (find)
module Fe
class Condition < ApplicationRecord
self.table_name = self.table_name.sub('fe_', Fe.table_name_prefix)
belongs_to :question_sheet
belongs_to :trigger,
class_name: "Question",
foreign_key: "trigger_id"
validates_presence_of :expression
validates_length_of :expression, maximum: 255, allow_nil: true
# evaluate triggering element against expression and return match|nil
def evaluate?
true
# answers = self.trigger.response # answers loaded?
# expression = self.expression.downcase
# answers.find {|answer| answer = answer.downcase; eval(expression)}
end
# javascript to toggle pages/elements based on the "response"
def trigger_js
# will find the first answer (if multiple/checkboxes) where the expression evaluates to true (downcase both to be case insensitive)
# if no match, disabled will be true, otherwise false
js = <<-JS
disabled = (response.find(function(answer) {
answer = toLowerCase(answer);
return eval("#{escape_javascript(self.expression.downcase)}");
}) == undefined);
JS
if toggle_id.nil?
# toggling a whole page (link), which will affect final page validation
else
# toggling an element (form element)... if page is loaded/cached (if not, the server-side will take care of it on load)
js = js + <<-JS
if(page_handler.isPageLoaded('page_#{self.toggle_page_id}'))
{
$('element_#{self.toggle_id}').disabled = disabled;
}
JS
end
js
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems