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Listing 7-3. Adding the simple_response Action to app/controllers/ajax_controller.rb
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class AjaxController < ApplicationController def simple_response render :text => "<p>Rails loves Ajax :D</p>" end end
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We also need to change the view code to include an element where the output from the controller call will be displayed. To make this happen, just add <span id="ajax_target"></span> to index.rhtml, as shown in Listing 7-4.
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Listing 7-4. Adding the Element for Displaying the Ajax Response to app/views/ajax/index.rhtml
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<%= link_to_remote "Run a controller method using Ajax", :update => "ajax_target", :url => { :controller => "ajax", :action => "simple_response" } %> <span id="ajax_target"></span>
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Once again, run your application, point your browser to http://localhost:3000/ajax, and click the link. The result will look something like Figure 7-2. Notice how the result of the controller action is placed inside the ajax_target element.
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Figure 7-2. The page after the Ajax action was called
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CHAPTER 7 IMPROVING INTERACTION WITH AJAX
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Try to use partials in your view code to make snippets of HTML easy to reuse. If you use a few parTip
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tials to render parts of a page, you can later use the same partial to update specific DOM elements, based on the user input, without having to duplicate view code. See 6 for details on using partials.
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This is Ajax in its simplest form using Rails. The link_to_remote function has many parameters that can be used to enhance the functionality of your web page. Let s look at some common options, beginning with displaying a confirmation dialog box.
Displaying a Confirmation Dialog
By using the :confirm parameter of link_to_remote, you can have a dialog box appear when the user clicks the link. The Ajax call will happen only if the user selects the OK option in the dialog box presented, as shown in Figure 7-3.
Figure 7-3. The confirmation box from the browser
The following code (added in app/views/ajax/index.rhtml) will display the same link as the previous example, but when clicked, will display the dialog box.
<%= link_to_remote "Run a controller method using Ajax", :update => "ajax_target", :confirm => "Are you sure you want to make an Ajax call ", :url => { :controller => "ajax", :action => "simple_response" } %>
Positioning the Response
Another optional parameter of link_to_remote is the position indicator, which can have the values :before, :top, :bottom, or :after. This parameter indicates where, relative to the DOM element referenced by the :update parameter, the HTML response should be rendered. The following code will display the same link as the original example, but the response from the server will be displayed after the div referenced by the :update parameter.
CHAPTER 7 IMPROVING INTERACTION WITH AJAX
<%= link_to_remote "Ajax call with position parameter", :update => "ajax_target", :position => :after, :url => { :controller => "ajax", :action => "simple_response" } %>
By repeatedly clicking the link, the text returned from the server will be appended just below the ajax_target element, as you can see in Figure 7-4.
Figure 7-4. Using the position parameter, results can be inserted after an element.
Using Callback Methods
The link_to_remote function also exposes some event-based callback methods that can be used to respond to events in the life cycle of the Ajax call. These callback methods are very useful if you need to perform any action in your page together with the Ajax call, such as manipulating the HTML. A special variable called request is available to callback methods. This variable holds information about the remote server call. Two of the most used request variables are request.responseText and request.status. Here s a basic example of using callbacks.
<%= link_to_remote "Ajax call with callbacks", :update => "ajax_target", :success => "alert(request.responseText)", :failure => "alert('Something went wrong')", :complete => "alert(request.status)", :url => { :controller => "ajax", :action => "simple_response" } %>
In this example, we use the alert function, so that after the link is clicked, you can see the raw HTML returned by the remote call and the HTTP return code. If the request can t be fulfilled properly, the failure callback is triggered and the user is notified. In this
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