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PORJS: Using observe_field on select_tag
 

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  1. PORJS: Using observe_field on select_tag
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    <p>The dropdown-menu (built by the select_tag) in my application should call the filter-category-action as soon as the user changes the value in the dropdown-menu AND hits the 'Go' button. </p> <p>Now I'd like to get rid of the 'Go' button and have an observer (observe_field?) call the filter-category-action as soon as the user changes the value in the dropdown-menu.</p> <p>Below you see the code I've written. It works using the 'Go'-Button but doesn't work by just changing the value in the dropdown-menu. What's wrong with my observe_category_select-helper?</p> <p><strong>View-partial with dropdown-menu and project list</strong></p> <pre><code> &lt;!-- drop down menu --&gt; &lt;% form_tag(filter_category_path(:id), :method =&gt; :post, :class =&gt; 'categories') do %&gt; &lt;label&gt;Categories&lt;/label&gt; &lt;%= select_tag(:category, options_for_select(Category.all.map {|category| [category.name, category.id]}, @category_id)) %&gt; &lt;!-- i would like to get rid of this button --&gt; &lt;%= submit_tag "Go" %&gt; &lt;% end %&gt; &lt;!-- list of projects related to categories chosen in drop down menu --&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; &lt;%= observe_category_select -%&gt; </code></pre> <p><strong>HelperMethod</strong></p> <pre><code> def observe_category_select observe_field( :category, :url =&gt; filter_category_path(:id), :with =&gt; 'category', :on =&gt; 'change' ) end </code></pre> <p><strong>Javascript-Output of the HelperMethod</strong></p> <pre><code>&lt;script type="text/javascript"&gt; //&lt;![CDATA[ new Form.Element.EventObserver('category', function(element, value) { new Ajax.Request('/categories/id/filter', {asynchronous:true, evalScripts:true, parameters:'category=' + encodeURIComponent(value) + '&amp;authenticity_token=' + encodeURIComponent('edc8b20b701f72285068290779f7ed17cfc1cf8c')}) }, 'change') //]]&gt; &lt;/script&gt; </code></pre> <p><strong>Categories controller</strong></p> <pre><code>class CategoriesController &lt; ApplicationController def show @category = Category.find(params[:id]) @category_id = @category.id @projects = @category.projects.find(:all) respond_to do |format| format.html # index.html.erb end end def index @projects = Category.find(params[:id]).projects.find(:all) respond_to do |format| format.html # index.html.erb end end def filter @category = Category.find(params[:category]) @category_id = @category.id @projects = @category.projects.find(:all) respond_to do |format| format.html # index.html.erb end end </code></pre> <p>end</p> <p><strong>Output of 'rake routes | grep filter'</strong></p> <pre><code> filter_category POST /categories/:id/filter {:controller=&gt;"categories", :action=&gt;"filter"} formatted_filter_category POST /categories/:id/filter.:format {:controller=&gt;"categories", :action=&gt;"filter"} </code></pre>
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