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POJquery Tokeninput & Dynamic Nested Forms
 

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    <p>I am using the setup of the <a href="http://railscasts.com/episodes/197-nested-model-form-part-2" rel="nofollow">R.B. railcast - #197 Nested Model Form Part 2</a> to dynamically add fields to the form but i am having issues getting the <a href="http://loopj.com/jquery-tokeninput/" rel="nofollow">Tokeninput fields</a> to work.</p> <p>Form:</p> <pre><code>&lt;%= form_for(current_user, :url =&gt; user_products_path) do |f| %&gt; &lt;%= f.error_messages %&gt; &lt;%= f.fields_for :user_products do |builder| %&gt; &lt;%= render "user_product_fields", :f =&gt; builder %&gt; &lt;% end %&gt; &lt;%= link_to_add_fields "Add a UserProduct", f, :user_products %&gt; &lt;%= f.submit "Create" %&gt; &lt;% end %&gt; </code></pre> <p>This is my user_product_fields partial, the token text_fields are what I'm having the issue with:</p> <pre><code>&lt;div class="fields"&gt; &lt;%= f.label :product_token, "Product" %&gt; &lt;%= f.text_field :product_token, :id =&gt; 'product_token' %&gt; &lt;%= f.label :address_token, "Address" %&gt; &lt;%= f.text_field :address_token, :id =&gt; 'address_token' %&gt; &lt;%= f.label :price %&gt; &lt;%= f.text_field :price %&gt; &lt;%= link_to_remove_fields "remove", f %&gt; &lt;/div&gt; </code></pre> <p>Jquery Tokeninput functions inside of my application.js:</p> <pre><code>$(function() { $("#product_token").tokenInput("/products.json", { prePopulate: $("#product_token").data("pre"), tokenLimit: 1 }); }); $(function() { $("#address_token").tokenInput("/business_addresses.json", { prePopulate: $("#address_token").data("pre"), tokenLimit: 1 }); }); </code></pre> <p>What the nested form does in the function is this:</p> <pre><code>function add_fields(link, association, content) { var new_id = new Date().getTime(); var regexp = new RegExp("new_" + association, "g") $(link).parent().before(content.replace(regexp, new_id)); } function remove_fields(link) { $(link).prev("input[type=hidden]").val("1"); $(link).closest(".fields").hide(); } </code></pre> <p>This line here:</p> <pre><code>var new_id = new Date().getTime(); </code></pre> <p>Makes the tokeninput fields dynamic, this is what i pulled up from the HTML, notice the changing long numbers in the fields. This is because of the line above.</p> <pre><code>&lt;label for="user_user_products_attributes_1313593151076_product_token"&gt;Product&lt;/label&gt; &lt;label for="user_user_products_attributes_1313593146876_product_token"&gt;Product&lt;/label&gt; &lt;label for="user_user_products_attributes_1313593146180_product_token"&gt;Product&lt;/label&gt; </code></pre> <p>How can i get my token fields to work when the fields keep changing up?</p> <p>Thank you.</p> <hr> <p><strong>EDIT: New working code.</strong></p> <pre><code> function add_fields(link, association, content) { var new_id = new Date().getTime(); var regexp = new RegExp("new_" + association, "g") $(content.replace(regexp, new_id)).insertBefore($(link).parent()).trigger("nestedForm:added"); } $('div.fields').live("nestedForm:added", function() { $("#product_token", $(this)).tokenInput("/products.json", { prePopulate: $("#product_token", $(this)).data("pre"), tokenLimit: 1 }); }); </code></pre> <hr> <p>When trying to <code>data-pre</code> with TokenInput:</p> <pre><code>def new @user_product = current_user.user_products.build # This line below is for TokenInput to work, This allowed me to use @products.map on the form. @products = [] end def edit @user_product = UserProduct.find(params[:id]) # This line below had to find the Product associated with the UserProduct @products = [@user_product.product] end </code></pre>
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    1. COThe first line in the solution was to be replaced in `add_fields` function. To make the class selector work, you need to change the user_product_fields partial to assign class instead of id. You would also need to scope the `$(".product_token").data("pre")` as I have done in the answer.
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    2. COThank you, you got it working!
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    3. COhow did you manage to use data-pre in the nested inputs?
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