Retrieve data from multiple dependent list data (SP Online)

Here is the CSOM ,.. you can tailor based on you need... Hope this helps !

 

function getItems(listName,siteUrl){ var request={}; request.listName=listName; request.siteUrl=siteUrl || _spPageContextInfo.siteAbsoluteUrl; var ctx = new SP.ClientContext(request.siteUrl); var list = ctx.get_web().get_lists().getByTitle(request.listName); request.query=SP.CamlQuery.createAllItemsQuery(); request.itemCollection=list.getItems(request.query); ctx.load(request.itemCollection); ctx.executeQueryAsync( processItems.bind(request) ,failure); } function processItems() { var received=this;//received 'request' from Caller received.items=[]; var listEnumerator = received.itemCollection.getEnumerator(); while (listEnumerator.moveNext()) { var listitem = listEnumerator.get_current(); received.items.push(listitem.get_id()); } console.info(received.listName,'has',received.items.length,'items IDs:',received.items); } function failure(sender, args){ console.error(args.get_message()); } console.clear(); for(var cycle=1;cycle<4;cycle++){// call multiple times to show ASYNC result in the console console.log('Calling 3 lists cycle:',cycle); getItems('Tasks'); getItems('Documents'); getItems('Images'); }

 

https://sharepoint.stackexchange.com/questions/164912/query-multiple-lists-using-javascript-csom