javascript - Creating a nested JSON object dynamically? -

i there cannot seem functionality going planned.

i have json 'jsondata' contains formula of different terms

"jsondata":{             "a" : "b + c",             "b" : "d + e",             "d" : "h + i",             "c" : "f + g"         } 

what trying have function pass 1 arguments 'mainitem'(ie. 1 of key in 'jsondata' example a in 'jsondata'). within function formula json data(for example 'mainitem' , b + c formula) , check dependency of child component of formula i.e check whether b , c have dependency down line in json data. if has dependency added child component parent example if b have formula in json data. b added 'mainitem' in child component of parent 'mainitem' a. @ end of code, get.

{ mainitem : "a", formula : "b+c", childcomponent: {                  mainitem: "b",                  formula : "d+e",                  childcomponent: {                                   mainitem: "d",                                   formula : "h+i"                                   }                  },                  {                  mainitem: "c",                  formula : "f+g"                  }, } 

the issue able create parent object. have no idea how create child component parent , if child component have sub child embedded child of child component , on. parent child hierarchy series

function getjson(mainitem) {   var json = {};   json['mainitem'] = mainitem;   $.each(jsondata, function(key, value){     if(mainitem == key){       json['formula'] = value;     }   }) } 

any insight highly appreciated. thank you.

you need/could write recursive function splits "formula" each composing component/item , check each component/item dependencies.

here solution you: http://jsfiddle.net/mqchen/4x7cd/

function getjson(item, data) {      if(!data["jsondata"].hasownproperty(item)) return null;      var out = {         mainitem: item,          formula: data["jsondata"][item]     };      // break formula     var components = out.formula.split(" ");      for(var = 0; < components.length; i++) {         var child = getjson(components[i], data); // recursive call childcomponents         if(child !== null) {             out["childcomponent"] = out["childcomponent"] == undefined ? [] : out["childcomponent"];             out["childcomponent"].push(child);         }     }      return out; }  // call getjson("a", data) 

note: not consider circular dependencies, i.e. if have a: "b + c", b: "d + a".