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To illustrate an Ajax request, let s enable our Client controller to respond to JSON and provide a method to supply the number of draft timesheets outstanding for each client:
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respond_to :html, :xml, :json # GET /clients/counts # GET /clients/countsxml
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# GET /clients/countsjson def counts respond_with(Clientall_with_counts, :root => 'clients') do |format| formathtml { redirect_to clients_path } end end
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This uses the Client class method all_with_counts which returns an array of hashmaps:
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def selfall_with_counts allmap do |client| { :id => clientid, :draft_timesheets_count => clienttimesheetsdraftcount } end end
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When GET /clients/counts is requested and the content type is JSON the response is:
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[{"draft_timesheets_count":0, "id":20}, {"draft_timesheets_count":1, "id":21}]
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You will note in the code example that HTML and XML are also supported content types for the response, so it s up to the client to decide which format works best for them We ll look at formats other than JSON in the next few sections In this case, our Client index view requests a response in JSON format:
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- content_for :head do = javascript_include_tag 'clientsjs' %table#clients_list - for client in @clients %tr[client] %td= clientname %td= clientcode %tddraft_timesheets_count= clienttimesheetsdraftcount = link_to 'Update draft timesheets count', counts_clients_path, :remote => true, 'data-type' => :json, :id => 'update_draft_timesheets'
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UJS probably should take the option :data_type and convert it to the HTML 5 attribute data-type when using jQuery, or explicitly specify the format in the URL when using Prototype We ll be keeping a lookout for that behavior in future versions of Rails
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To complete the asynchronous part of this Ajax-enabled feature, we also need to add an event-handler to the UJS ajax:success event, fired when the Ajax call on the update_draft_timesheets element completes successfully Here, jQuery is used to bind a JavaScript function to the event once the page has loaded This is defined in clientsjs:
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$(function() { $("#update_draft_timesheets")bind("ajax:success", function(event, data) { $(data)each(function() { var td = $('#client_' + thisid + ' draft_timesheets_count') tdhtml(thisdraft_timesheets_count); }); }); });
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In each row of the clients listing, the respective td with a class of draft_timesheets_count is updated in place with the values from the JSON response There is no need for a page refresh and user experience is improved As an architectural constraint, this does require this snippet of JavaScript to have intimate knowledge of the target page s HTML structure and how to transform the JSON into changes on the DOM This is a major reason why JSON is the best format for decoupling the presentation layer of your application or, more importantly, when the page is requesting JSON from another application altogether Sometimes, however, it may be desirable for the server to respond with a snippet of HTML which is used to replace a region of the target page
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The Ruby classes in your Rails application will normally contain the bulk of that application s logic and state Ajax-heavy applications can leverage that logic and state by transferring HTML, rather than JSON, to manipulate the DOM A web application may respond to an Ajax request with an HTML fragment, used to insert or replace an existing part of the page This is most usually done when the transformation relies on complex business rules and perhaps complex state that would be inefficient to duplicate in JavaScript Let s say your application needs to display clients in some sort of priority order, and that order is highly variable and dependent on the current context There could be a swag of rules dictating what order they are shown in Perhaps it s that whenever a client has more than a number of draft timesheets, we want to flag that in the page
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%tddraft_timesheets_count - if clienttimesheetsdraftcount > 3 %spandrafts-overlimit WARNING! %br = clienttimesheetsdraftcount