Dynamic action - Cache server data

Question

APEX 4.2.2
Is there a way to cache server side data in a global (page/document level) Javascript vector (bunch of key-value pairs) (associative array, array of objects or some such)? This way the data can be used by subsequent dynamic actions' Javascript code without querying the server over and over.
I see that apex_util.json_from_sql is still undocumented after all these years. Are there any examples of using that API to do this sort of thing? Can someone please share?
Thanks

Answer 1

https://apex.oracle.com/pls/apex/f?p=57688:24
I took a shot at this and it seems to work well using Javascript global objects for data storage. Hope this helps someone.
1. Page attributes - Javascript global variables var gData,gLookup={};2. On-demand application process Get_Emps as apex_util.json_from_sql('select empno,ename from emp');3. Page Load dynamic action to invoke the application process and cache the data var get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=Get_Emps',$v('pFlowStepId'));
var retval=get.get();get=null;
gData=apex.jQuery.parseJSON(retval);
$.each(gData.row,function(i,obj){
   gLookup[obj.EMPNO]=obj.ENAME;
});4. EMPNO page item - Standard OnChange dynamic action to SetValue of ENAME page item using the cached data - Javascript expression gLookup[$v(this.triggeringElement)]
We document something when it is ready to be supported. This specific procedure isn't something we haven't invested in, and thus, per our discretion, have elected not to document or support it at this time.Fair enough.