如何访问 JavaScript Object 中的值

Question

This question has been asked before, however, the current answers don't solve my problem. When console.log-ing the value I am trying to grab from my object (an object retrieved from JSON) I get back some sort of

"Uncaught TypeError: Cannot read property 'approximateGroup' of undefined"

the JSON data is assigned to a var named rxcui and consists of the following:

{"approximateGroup":{"inputTerm":"paxil","maxEntries":"1","option":"0","comment":"","candidate":
[{"rxcui":"114228","rxaui":"826081","score":"100","rank":"1"},
{"rxcui":"114228","rxaui":"826082","score":"100","rank":"1"},
{"rxcui":"114228","rxaui":"8053434","score":"100","rank":"1"}]}}

and my code is

console.log(rxcui.[0].approximateGroup.candidate[0].rxcui);

I have tried inspecting the object in my browser, copying the path and using every combination I could possibly think to for the last few hours. I understand that if I get a return of undefined then my path is wrong, but this is what path makes sense. The exact path my browser tells me its at is:

[0].approximateGroup.candidate[0].rxcui

I've tried finding the path in the success function jquery for the JSON page as well with no success.

Please help, I'm going insane:+)

Answer 1

Your first property is the object approximateGroup , then you can acess the candidate array indicating the first index, then you acess the rxcui property of this object.

console.log(YourOBJ.approximateGroup.candidate[0].rxcui)

Answer 2

Here's your json in a more readable format

{
  "approximateGroup": {
    "inputTerm": "paxil",
    "maxEntries": "1",
    "option": "0",
    "comment": "",
    "candidate": [
      {
        "rxcui": "114228",
        "rxaui": "826081",
        "score": "100",
        "rank": "1"
      },
      {
        "rxcui": "114228",
        "rxaui": "826082",
        "score": "100",
        "rank": "1"
      },
      {
        "rxcui": "114228",
        "rxaui": "8053434",
        "score": "100",
        "rank": "1"
      }
    ]
  }
}

rxcui is a property of an object within the candidate array. The candidate array is a property within the approximategroup object.

If we assign the json to a variable x then you can address it in this way

const firstRxcuit = x.approximateGroup.candidate[0].rxcui

Answer 3

I think you are mixing up array and object notation, you cant use [Int] by index in an object, only an array, you can however use ["some prop"] against an object to find a value of a property

 var rxcui = {"approximateGroup":{"inputTerm":"paxil","maxEntries":"1","option":"0","comment":"","candidate": [{"rxcui":"114228","rxaui":"826081","score":"100","rank":"1"}, {"rxcui":"114228","rxaui":"826082","score":"100","rank":"1"}, {"rxcui":"114228","rxaui":"8053434","score":"100","rank":"1"}]}} console.log(rxcui.approximateGroup.candidate[0].rxaui) // returns "826081"