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Dynamic components using SPA concepts in AEM

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A presentation given at the adaptTo() 2014 tech meetup on the topic of developing dynamic AEM components using concepts borrowed from the SPA philosophy.

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Dynamic components using SPA concepts in AEM

  1. 1. APACHE SLING & FRIENDS TECH MEETUP BERLIN, 22-24 SEPTEMBER 2014 Dynamic Components using SPA Concepts Andon Sikavica, Bojana Popovska - Netcetera
  2. 2. Dynamic Components adaptTo() 2014 2
  3. 3. Dynamic vs Static Components Initial and form-based components take big chunk of the statics We spend more than 90% of the time developing dynamics Count of Dynamic vs Statics (in hundreds) Dynamic Static adaptTo() 2014 3
  4. 4. Dynamic Component Development  Placeholder for dynamic component in dispatcher  think about what you will have in the dispatcher  Request dynamic component via URL  /content/page/_jcr_content/par/comp.dynamic.html  Instruct dispatcher not to cache based on selector  #/0042 { /type "deny" /glob "GET *.dynamic.html*" } adaptTo() 2014 4
  5. 5. Server Side Includes Browser Dispatcher AEM GET Page return complete Page <!--#include virtual= “${c.resourcePath}.dynamic.html}”--> GET dynamic component HTML return component HTML with dynamic data Generate HTML adaptTo() 2014 5
  6. 6. AJAX Browser Dispatcher AEM GET Page return Page with Placeholders GET dynamic component HTML $.ajax({ url: '${c.resourcePath}.dynamic.html', success: function(data) { $(“#${c.identifier}").replaceWith(data); }}); return component HTML with dynamic data Generate HTML Create Markup adaptTo() 2014 6
  7. 7. Summary  Sling Concepts  component-path  selectors  sling:resourceSuperType  Aspect-Oriented Solution  Sling Dynamic Include adaptTo() 2014 – https://www.flickr.com/photos/fabrisalvetti/489593502 image by Fabrizio Salvetti 7
  8. 8. What if…  … you have high number of dynamic components on a single page?  … your components need to communicate between themselves and update their state?  … you need to do notifications for the user? …basically need SPA adaptTo() 2014 8
  9. 9. Why were the usual approaches Tricky? SSI was meant to be used with page reloads AJAX works with pre-loaded Markup from server adaptTo() 2014 - https://www.flickr.com/photos/15708236@N07/2754478731 photo by jphilipg 9
  10. 10. Single Page Application adaptTo() 2014 10
  11. 11. SPA Component  Rendering Script (JSP)  Cached, Inherited  Module (JS)  Cached, Composition  Controller  Handles all dynamic calls Abstract Table Paging Sorting adaptTo() 2014 11
  12. 12. Page Load Browser Dispatcher AEM GET Page return Markup Skeleton POST for Dynamic Data return Dynamic Data as JSON Serialize Data as JSON Render HTML using Template with dynamic data adaptTo() 2014 12
  13. 13. Technologies  jQuery  jQuery Template  GSON  NEBA (Spring MVC, AOP) adaptTo() 2014 13
  14. 14. Benefits  Perceived User Experience  Separation of front- and back-end engineering  easier development  prototype  mocked data adaptTo() 2014 - https://www.flickr.com/photos/mishism/5370473007 photo by Mish Sukharev 14
  15. 15. Showcase adaptTo() 2014 15
  16. 16. Rendering Script <script type=“text/html” id=“scheduleTableTemplate”> <tr> <td data-content=“talkName”></td> <td data-content =“time”></td> </tr> Static Markup </table> Template </script> class=“scheduleTable”> <th> <td>Talk Name</td> <td>Time</td> </th> <tbody></tbody> $(‘.scheduleTable tbody’).loadTemplate( $(‘#scheduleTableTemplate’), data.talks); <table <script type=“text/javascript”> aemdemo.scheduletable.init( ‘http://localhost:4502/bin/mvc.do/scheduletable/getresult’); </script> Inject data Initialization script adaptTo() 2014 16
  17. 17. Module aemdemo.persondetailstable = (function($, paging, sort){ var params; function init (dataUrl){ params.dataUrl = dataUrl; } function getDataByPage (pageNumber) { $.ajax { data : {. . .}, url : params.dataUrl, success : function (data){paging.update (data)} } } return { init:init } }(jQuery, aemdemo.paging, aemdemo.sort)); adaptTo() 2014 17
  18. 18. Controller @Controller public class ScheduleTableController { @RequestMapping(value = "/scheduletable/getresult", produces = {"application/json; charset=UTF-8" }, method = POST) @ResponseBody public String getResult(@RequestParam int pageNumber) { ConferenceDay conferenceDay = getDataFromService(); return serializeData(conferenceDay); } adaptTo() 2014 18 }
  19. 19. Identify and Control POSTs  Add Header $.ajaxPrefilter(function (options, originalOptions, jqXHR) { jqXHR.setRequestHeader('X-Request-Source', ‘spa-ajax'); });  Check Handler Servlet servlet = servletResolver.resolveServlet(slingRequest); if (“SlingPostServlet”.equals(servlet.getClass().getSimpleName() && … ) { // ups } adaptTo() 2014 19
  20. 20. Demo Project https://github.com/andon/spademo adaptTo() 2014 20
  21. 21. Questions adaptTo() 2014 21
  22. 22. Thank You! adaptTo() 2014 22

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