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One of the rules of good interface design is to make things snappy. That is to say, the interface should be responsive and quick to load. A good way to achieve this is to load elements (like forms or content areas) onto the page whenever the user requests them. Modify the article s show template as shown in Listing 82. Listing 8-2. The Article Partial in app/views/articles/show.html.erb: http://gist.github.com/353475 <%= render @article %> <h3>Comments</h3> <div id="comments"> <%= render @article.comments %> </div> <%= link_to "new comment", new_article_comment_path(@article, :format => :js), :remote => true, :id => 'new_comment_link' %>
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The template hasn t changed a lot: you no longer directly render the comment form, and you add a link called new comment . The new link still uses the well-known link_to helper to generate a link; however, you pass in the :remote => true option, which tells Rails that you want the request triggered by this link to hit the server using Ajax. There are a couple of things to note in the use of link_to in Listing 8-2. First, you send the request to a URL that already exists; the new_article_comment_path route identifies a path to a new comment. However, you pass in the :format => :js argument, which tells Rails that you re requesting a JavaScript representation of your page, fitting your intention. Second, you use the :id => 'new_comment_link' option to give the rendered HTML element an ID that you can refer to later. On the server side, you don t need to make any changes to the comments controller. As currently implemented, you don t explicitly implement a new action; the default behavior in this case is to render the new template in app/views/comments/new.html.erb. That isn t really what you want this template shouldn t be the result of this JavaScript call. Instead, you want a separate JavaScript template to be used as response for this action.
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Your controller reads the format parameter passed in from the browser. To make sure you send a response that includes JavaScript code, you must create a template with the .js.erb template extension. Create the app/views/comments/new.js.erb template as per Listing 8-3. The following text explains all the lines in the template to make sure you know what s happening. Listing 8-3. The .js.erb New Comment Template in app/views/comments/new.js.erb: http://gist.github.com/353484 $("<%= escape_javascript render(:file => 'comments/new.html.erb') %>").insertAfter('#comments'); $('#new_comment_link').hide(); The first line renders the existing app/views/comments/new.html.erb template into a string variable that you dynamically insert into the HTML page, right after the comments div that s achieved by using jQuery s insertAfter method, which, as its name implies, inserts a block of HTML after an existing HTML element. Table 8-2 lists similar jQuery methods that you can use in place of insertAfter. Table 8-2. jQuery Methods for Inserting HTML into a Page
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insertAfter(target)
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Inserts the preceding element after the target element passed as a parameter Inserts the preceding element before the target element passed as a parameter Appends the preceding element with the passed content element Prepends the preceding element with the passed content element
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insertBefore(target)
append(content) prepend(content)
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Going back to Listing 8-3, the second and last line hides the new_comment_element, which contains the link to add a new comment. Because you already have the comment form in your page, it makes little sense to keep that link around. Hiding an element is achieved by calling jQuery s hide method on the element you want to hide.
NOTE In a similar fashion, you can call jQuery s show method to display a hidden element. As you can see, it s very important that you know your way around jQuery to be able to build complex user interfaces.
Let s see what you built in practice. Open your browser to any existing article, such as http://localhost:3000/articles/2, and notice that the comments form is no longer there (see Figure 8-1). As soon as you click the new comment link, the comment form pops up into place, and you can add comments (see Figure 8-2). You achieved your goal of keeping the user interface cleaner, while allowing users to quickly access functionality without having to move to a new page. That s a good start.
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