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PORails 3 how do I update the page with a recursive loop (building tree graph)?
 

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  1. PORails 3 how do I update the page with a recursive loop (building tree graph)?
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    <p>I have a following situation.</p> <p>In the model I am populating a table, which has a tree-like structure. I have a Graph model that has_many :nodes and Node model that has a "content" column that is populated during by the following:</p> <pre><code>class Graph &lt; ActiveRecord::Base def start_collecting self.content_collection(self.nodes.first) end def content_collection(root) root.children.all(:order =&gt; "idx DESC").each do |node| #Here the function in Node model is called, that populates 'content' column in node's table. content_array &lt;&lt; node.content.to_s self.children_content = content.array self.save! child.collect_content if !node.children.blank? self.content_collection(node) end end end </code></pre> <p>The question is.. I want to have the progress being displayed on the web page (app/views/graphs/show.html.erb). So far I am doing this:</p> <pre><code> setInterval(function(){ var text = &lt;%= array_or_string_for_javascript(@graph.children_content)%&gt; ; var pjs = Processing.getInstanceById("graphsketch"); pjs.update(text); }, 3000); </code></pre> <p>So that I am just redrawing the content of @graph.children_content on screen every 3 seconds.. I wonder what would be the best way to draw the contents of each @node.content with this timed refresh? Obviously if I just write an .each loop in show.html.erb I will keep getting the content of the last @node in the loop... Basically I wonder how to translate the loop from the above model onto the view and make the progress visible?</p> <p>Hope this is clear enough, please let me know if I should explain better... </p> <p>EDIT :: </p> <p>So following the advice, now I have in graph_controller.rb:</p> <pre><code>def getstatus @graph = Graph.find(params[:id]) @graph_so_far = @graph.get_graph respond_to do |format| format_js end end </code></pre> <p>in Graph.rb:</p> <pre><code>def get_graph(root = self.nodes[0], word_ary = []) @root = root @root.children.all(:order =&gt; "idx DESC").each do |child| n_node = (child.depth*2).to_s+child.content word_ary &lt;&lt; n_node child.parent_relation.collect_videos_multiple_cats if !child.children.blank? self.get_graph(child, word_ary) end end return word_ary end </code></pre> <p>In graphs/show.html.erb :</p> <pre><code> &lt;script&gt; $(document).ready(function () { setInterval(function(){ var idx = "&lt;%= @graph.id %&gt;"; $.get("getstatus/", {idx} ) },1000); }); &lt;/script&gt; &lt;%= javascript_include_tag "pjs" %&gt; &lt;canvas id="graphsketch" data-processing-sources="/assets/pjs/graphBuilder2_2.pde"&gt;&lt;/canvas&gt; </code></pre> <p>In graphs/getstatus.js.erb</p> <p>var text = &lt;%= array_or_string_for_javascript(@sentence_so_far)%> ; var pjs = Processing.getInstanceById("graphsketch"); alert(text); pjs.update(text);</p> <p>The alert in getstatus.js.erb never fires.</p> <p>In routes (of course):</p> <pre><code> resource :graphs do collection do get 'getstatus' end end </code></pre> <p>What am I doing wrong? Thanks a lot for the help again..</p>
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    1. COgetstatus.js.erb should be in app/views/graphs, is it?
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      1. USRadBrad
    2. COah. just actually changed format_js to format.js and everything works. Thanks a lot!
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    3. COAlso, i think the call to the AJAX should be more like $.get("/graphs/getstatus"); I use jquery always, so I'm not very familiar with javascript WITHOUT jquery!!!!
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