APEX Bad Practices

2. <bragging>

3. </bragging>

4. 3 Membership Tiers • Oracle ACE Director • Oracle ACE • Oracle ACE Associate bit.ly/OracleACEProgram 500+ Technical Experts Helping Peers Globally Connect: Nominate yourself or someone you know: acenomination.oracle.com @oracleace Facebook.com/oracleaces oracle-ace_ww@oracle.com

5. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous

6. Get organised

7. Naming stuff

8. Need a Page Item Value on other pages? Use an Application Item Use P0_EMPNO Use P1_EMPNO

9. $(“#P1_EMPNO”)apex.item(“P1_EMPNO”)

10. Divide and conquer

11. A few Applications with a lot of Pages

12. A lot of Applications with a few Pages

13. MASTER SEED subscription APP 1 APP 2 APP 3 copy subscription subscription subscription

14. ✅ ❌ ❔ ❌ ❌ ❌ ❌ ✅ ✅ ✅ ❌ ❌ ❌ ✅ ✅ ✅ ❌ ❌ ❌ ❌ ❌ ❌ ❌ ✅ ❌ ✅ ❌ ✅ ✅ ❌ ❌ ❌ ❌ ❌ ❌

15. Page 0

16. Unsubscribe

17. NEVER Unsubscribe

18. Don’t put your ﬁles in the APEX directories

19. /usr/local/tomcat/webapps/i

20. /usr/local/tomcat/webapps/ mycode /mycode/js/myJsFile.js

23. Dude, where’s my code?

24. Process Region / Item Source Condition Read Only Condition Item Default Dynamic Action Validation Where CAN you put your PL/SQL?

25. Where SHOULD you put your PL/SQL? Reusable Testable Compiled Dependencies

26. Some more remarks regarding PL/SQL

27. select * from my_big_table where field = v('P2_EMPNO')

28. select * from my_big_table where field = ( select v('P2_EMPNO') from dual )

29. with param as ( select v('P2_EMPNO') empno from dual ) select * from my_big_table , param where field = param.empno

30. with param as ( select /*+ MATERIALIZE */ v('P2_EMPNO') empno from dual ) select * from my_big_table , param where field = param.empno

31. FORMAT MASK

32. render / submit / ajax

33. Beware of undocumented features

34. APEX 5 APEX 18 :APXWS_SEARCH_STRING_1 :APXWS_EXPR_1 :apex$f1 https://roelhartman.blogspot.com/2016/07/prevent-general-row-based-search-in.html

37. And what about JavaScript …

38. Page “JavaScript section” Page header / footer Region header / footer Item Pre / Post Text URL target Dynamic Action When / Condition DA Action : Execute JavaScript Code Where CAN you put your JavaScript?

39. Where SHOULD you put your JavaScript? In a file (on your network / static app file) (reference in the User Interface Details) In a Plugin (JavaScript file) Roels Rule : No JavaScript anywhere else

40. The code is more what you'd call "guidelines" than actual rules

41. How should you code your JavaScript? $(“#P1_EMPNO”) or apex.item(“P1_EMPNO”)

42. How should you code your JavaScript? $v(“#P1_EMPNO”) or apex.item(“P1_EMPNO”).getValue()

43. How should you code your JavaScript? $v(“P1_EMPNO”) or apex.item(“P1_EMPNO”).getValue()

44. Know your APEX JavaScript API’s https://docs.oracle.com/en/database/oracle/application-express/19.1/aexjs/index.html

46. gReport

47. htmldb_Get

48. A lot of stuﬀ in the Interactive Grid

49. Watch your plugins …

51. Beware of DOCUMENTED features

52. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function(){ openModal( this.affectedElements[0].id ); }'; return l_result; end;

53. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function(){ openModal( this.affectedElements[0].id ); }'; return l_result; end;

54. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function({ apex.theme.openRegion( this.affectedElements[0].id ); }'; return l_result; end;

57. Miscellaneous

58. Dynamic Actions are cool

59. Page Process / Computation

60. Region refresh Page refresh Row refresh

61. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function(){ var myGrid = apex.region( this.affectedElements[0].id ) .widget().interactiveGrid("getViews").grid; myGrid.model.fetchRecords( myGrid.getSelectedRecords() ); }'; return l_result; end;