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# frozen_string_literal: true
# Rails Helper methods to take a hash and turn it to form <input type="hidden">
# fields, works with hash nested with other hashes and arrays, standard rails
# serialization style. Oddly while Hash#to_query will do this for a URL
# query parameters, there seems to be no built in way to do it to create
# hidden form fields instead.
#
# Code taken from http://marklunds.com/articles/one/314
#
# This is used to serialize a complete current query from current params
# to form fields used for sort and change per-page
module Blacklight::HashAsHiddenFieldsHelperBehavior
##
# Writes out zero or more <input type="hidden"> elements, completely
# representing a hash passed in using Rails-style request parameters
# for hashes nested with arrays and other hashes.
# @param [Hash] hash
# @return [String]
def render_hash_as_hidden_fields(hash)
hidden_fields = []
flatten_hash(hash).each do |name, value|
value = Array.wrap(value)
value.each do |v|
hidden_fields << hidden_field_tag(name, v.to_s, id: nil)
end
end
safe_join(hidden_fields, "\n")
end
private
def flatten_hash(hash = params, ancestor_names = [])
flat_hash = {}
hash.each do |k, v|
names = Array.new(ancestor_names)
names << k
if v.is_a?(Hash)
flat_hash.merge!(flatten_hash(v, names))
else
key = flat_hash_key(names)
key += "[]" if v.is_a?(Array)
flat_hash[key] = v
end
end
flat_hash
end
def flat_hash_key(names)
names = Array.new(names)
name = names.shift.to_s.dup
names.each do |n|
name << "[#{n}]"
end
name
end
end
Version data entries
20 entries across 20 versions & 1 rubygems