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POHow to add and remove nested model fields dynamically using Haml and Formtastic
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  1. POHow to add and remove nested model fields dynamically using Haml and Formtastic
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    copied!<p>We've all seen the brilliant <a href="http://railscasts.com/episodes/197-nested-model-form-part-2" rel="noreferrer">complex forms railscast</a> where Ryan Bates explains how to dynamically add or remove nested objects within the parent object form using Javascript.</p> <p>Has anyone got any ideas about how these methods need to be modified so as to work with Haml Formtastic? </p> <p>To add some context here's a simplified version of the problem I'm currently facing:</p> <p># Teacher form (which has nested subject forms) [from my application]</p> <pre><code>- semantic_form_for(@teacher) do |form| - form.inputs do = form.input :first_name = form.input :surname = form.input :city = render 'subject_fields', :form =&gt; form = link_to_add_fields "Add Subject", form, :subjects </code></pre> <p># Individual Subject form partial [from my application]</p> <pre><code>- form.fields_for :subjects do |ff| #subject_field = ff.input :name = ff.input :exam = ff.input :level = ff.hidden_field :_destroy = link_to_remove_fields "Remove Subject", ff </code></pre> <p># Application Helper (straight from Railscasts)</p> <pre><code> def link_to_remove_fields(name, f) f.hidden_field(:_destroy) + link_to_function(name, "remove_fields(this)") end def link_to_add_fields(name, f, association) new_object = f.object.class.reflect_on_association(association).klass.new fields = f.fields_for(association, new_object, :child_index =&gt; "new_#{association}") do |builder| render(association.to_s.singularize + "_fields", :f =&gt; builder) end link_to_function(name, h("add_fields(this, \"#{association}\", \"#{escape_javascript(fields)} \")")) end </code></pre> <p>#Application.js (straight from Railscasts)</p> <pre><code> function remove_fields(link) { $(link).previous("input[type=hidden]").value = "1"; $(link).up(".fields").hide(); } function add_fields(link, association, content) { var new_id = new Date().getTime(); var regexp = new RegExp("new_" + association, "g") $(link).up().insert({ before: content.replace(regexp, new_id) }); } </code></pre> <p>The problem with implementation seems to be with the javascript methods - the DOM tree of a Formtastic form differs greatly from a regular rails form.</p> <p>I've seen this question asked online a few times but haven't come across an answer yet - now you know that help will be appreciated by more than just me!</p> <p>Jack</p>
 

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