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PORJS: Ajaxified select_tag
 

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  1. PORJS: Ajaxified select_tag
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    <p>Since I didn't get the expected answer on my <a href="https://stackoverflow.com/questions/575862/rjs-using-observefield-on-selecttag">last question</a> I'll try to simplify and narrow my question:</p> <blockquote> <p>How can I build a dropdown-menu that uses AJAX (no submit-button) to call the show action of a certain controller?</p> </blockquote> <p>The following things are given:</p> <p><strong>Model-Association</strong> is <em>Categories HABTM Projects</em>, therefore the dropdown-menu consists of all category names.</p> <p>The <strong>view partial</strong> where the dropdown-menu should be implemented. Below the dropdown menu is a list of projects that should change according to the choice made in the dropdown menu:</p> <pre><code> &lt;!-- placeholder for AJAX dropdown menu --&gt; &lt;!-- list of projects related to categories chosen by the select tag --&gt; &lt;ul class="projects"&gt; &lt;% @projects.each do |_project| %&gt; &lt;li&gt; &lt;%= link_to(_project.name, _project) %&gt; &lt;/li&gt; &lt;% end %&gt; &lt;/ul&gt; </code></pre> <p>The <strong>Categories controller</strong> with the show-action that should be called:</p> <pre><code>class CategoriesController &lt; ApplicationController def show # params[:id] should be the choice the user made in the dropdown menu @category = Category.find(params[:id]) @projects = @category.projects.find(:all) respond_to do |format| format.html # show.html.erb format.js # needed for ajax response? end end def index @projects = Category.find(params[:id]).projects.find(:all) @category = @project.categories.first respond_to do |format| format.html # index.html.erb end end end </code></pre> <p>The <strong>route</strong> to call the show-action in the Categories controller:</p> <pre><code>category GET /categories/:id {:controller=&gt;"categories", :action=&gt;"show"} </code></pre> <p>How would you implement this? Any help is very apreciated!</p>
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