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POHow to dynamically change position of form based on selection
 

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  1. POHow to dynamically change position of form based on selection
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    <p>I am building a website that is basically a small Content Management System. (in the sense that the user will be able to dynamicaly change most content of the site)</p> <p>In my rails app I have two models, a Category and a Subcategory. A Category has many Subcategories, and a Subcategory belongs to a Category. </p> <p>Each subcategory has a position field, which dictates where it is displayed under the category.</p> <p>When creating a subcategory by form, I want the user to have the option to select the category from a list of all categories in the database (Which I have working fine). I then want the position field (a dropdown box) to update based on what positions are currently available within that category. </p> <p>My current idea to track the available position for subcategory in my Application Controller is:</p> <pre><code>def subcategory_count(subcategory) category = subcategory.category @count = category.subcategories.count end </code></pre> <p>I then add +1 to <code>@count</code> so it gives me the available positions, +1. (If anyone has a better way of doing this, please let me know.)</p> <p>I am currently following Ryan Bates' railscasts 88 revised which is dynamic select menus revised. Here is what my form looks like right now.</p> <pre><code>&lt;%= form_for(@subcategory) do |f| %&gt; &lt;p&gt; &lt;%= f.label(:name) %&gt; &lt;%= f.text_field :name %&gt; &lt;/p&gt; &lt;p&gt; &lt;%= f.label(:category_id) %&gt; &lt;%= f.collection_select :category_id, Category.order(:position), :id, :name, include_blank: true %&gt; &lt;/p&gt; &lt;p&gt; &lt;%= f.label :position, "Position" %&gt; &lt;%= f.grouped_collection_select :position, Category.order(:position), :subcategories, :name, :position, :position%&gt; &lt;/p&gt; &lt;p&gt; &lt;%= f.submit("Submit") %&gt; &lt;/p&gt; &lt;% end %&gt; </code></pre> <p>The problem with this code is that I need it to display as an int so I can add +1 to it, otherwise when there are no subcategories in the database it just shows blank and doesn't allow me to pick the "1" position.</p> <p>So, I need to find a way to update the field to show the available positions in the category, but I don't know how to do that exactly. Any help will be greatly appreciated.</p>
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