Question

I have a nested form with checkboxes and text fields. I would like to be able to have the text fields only be enabled if the text box for that specific nested form is clicked/enabled. It is currently hard coded to enable/disable fields if the “custom” text box is set. How can I have javascript update these textbox attributes on the fly?

Form.erb now

<%= simple_nested_form_for @client do |f| %>
  <%= f.fields_for :client_prices do |def_price_form| %>
  <div class="controls controls-row">
    <div class='span10'>
      <% if def_price_form.object.custom == true  %>
        <%= def_price_form.input :custom, :wrapper_html => { :class => 'span1' } %>
        <% end %>
        <%= def_price_form.input :visit_type, :wrapper_html => { :class => 'span2' } %>
        <%= def_price_form.input :price, :wrapper => :prepend, :wrapper_html => { :class => 'span2' }, :label => "Price" do %>
          <%= content_tag :span, "$", :class => "add-on" %>
          <%= def_price_form.input_field :price %>
          <%= def_price_form.link_to_remove '<i class="icon-remove"></i>'.html_safe, :class => 'btn btn-danger', :wrapper_html => { :class => 'span3 pull-left' } %>
          <%end%>
      <% else %>
        <%= def_price_form.input :custom, :hidden => false, :wrapper_html => { :class => 'span1' } %>
        <%= def_price_form.input :visit_type, disabled: true,  :wrapper_html => { :class => 'span2' } %>
        <%= def_price_form.input :price, :wrapper => :prepend, :wrapper_html => { :class => 'span2' }, :label => "Price" do %>
          <%= content_tag :span, "$", :class => "add-on" %>
          <%= def_price_form.input_field :price, disabled: true %>
          <%end%>
      <%end%>
    </div>
  </div>
  <% end %>
  <%= f.link_to_add "Add a custom price", :client_prices, :class => 'btn btn-success' %>
  <p>&nbsp;</p>
  <div class="controls">
    <%= f.button :submit, :class => 'btn btn-primary' %>
  </div>
<% end %>

HTML generated by RoR here
http://jsfiddle.net/59AXJ/

Answer 1

This gets the attribute name from the checkbox that is clicked. Then finds inputs that have similar names, those are the inputs that we will toggle “disabled”.

$("input[type='checkbox']").click(function () {
    var thisCheckbox = $(this);
    var id = $(this).attr("id");
    var text = $("label[for=" + id + "]").text().toLowerCase();
    var name = $(this).attr("name").replace("[" + text + "]", "");
    $("input[name*='" + name + "']").each(function () {
        var thisInput = $(this);
        if (thisInput.attr("disabled")) {
            thisInput.removeAttr("disabled");
        } else {
            thisInput.attr("disabled", "disabled");
            thisCheckbox.removeAttr("disabled");
        }
    })
});

http://jsfiddle.net/Sbw65/ <– test it out