CODEWITHSUNDEEP
javascriptjqueryhtmljsonundefined
Gunter
Gunter

Reputation: 23

Cannot read property 'TUT' of undefined?

I loaded a json file with jquery and then tried to access certain properties but I get an undefined error. When I print the json object, I can clearly see the object in it.

{
 "Calculus 1": {
    "LEC": {
      "sections": [
        "LEC01",
        "LEC02"
      ],
      "days": [
        [
          "MO",
          "WE"
        ],
        [
          "MO",
          "TH"
        ]
      ],
      "start": [
        [
          "12:00",
          "11:00"
        ],
        [
          "13:00",
          "13:00"
        ]
      ],
      "end": [
        [
          "13:00",
          "13:00"
        ],
        [
          "14:00",
          "15:00"
        ]
      ]
    },
    "TUT": {
      "sections": [],
      "days": [],
      "start": [],
      "end": []
    },
    "PRA": {
      "sections": [],
      "days": [],
      "start": [],
      "end": []
    }
  }
}

Here is how a simplified version of my JSON looks like. The part in my code that tries to access a property looks like this.

if(info[courses[i]]['TUT']['sections'].length == 0){
         tut = -1;
}

Here is how I loaded my JSON. The code above is inside the some function. When I print the info inside the function after passing it, it's exactly what I have in my JSON. 

$.getJSON('/public/courseinfo.json', function(info){

        var x = some_function(courses, info);

    });

The error I get is "Cannot read property 'TUT' of undefined". Info is just the variable for the object I loaded from my JSON. When I print the variable to console, I get exactly how it should look like. If I just do `info[courses[i]] = some property' I don't get an error. 'info[courses[i]].length == 0' also prompts a cannot read property 'length' error. I'm not sure if it's a syntax issue, but I can't seem to figure out what is wrong with it.

Upvotes: 0

Views: 56

Answers (1)

dasl
dasl

Reputation: 432

Error is throwing because info[courses[i]] is undefined. check whats returning as courses[i]. courses[i] should be returning Calculus 1

Upvotes: 1

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