CODEWITHSUNDEEP
javascriptjson
Jamie Fearon
Jamie Fearon

Reputation: 2634

Testing for existence of a properties in JSON using javascript

I have the following JSON ("name" has more members only showing "cinema" here for simplicity)

{
    "name": {
        "cinema": {
            "size": {
                "w": 256,
                "h": 200
            },
            "frame": {
                "x": 0,
                "y": 0,
                "w": 256,
                "h": 200
            }
        }
     }
}

Which has been parsed using JSON.parse and stored in the varable bts_json. I want to loop through each member of "name" and detect if it has the member "frame". Below is my code, I get nothing printed on the console.

buildingNames = bts_json.name;

for (buildingFrame in buildingNames) {
   if (buildingFrame.hasOwnProperty("frame")) {
          console.log('exists');
          console.log(buildingFrame["frame"]["y"]);
    }
}

Where am I going wrong?

Thanks for helping :)

Upvotes: 1

Views: 58

Answers (1)

jAndy
jAndy

Reputation: 236192

You won't get the object, but the property name in buildingFrame, so you need to make it work like

if (buildingNames[ buildingFrame ].hasOwnProperty("frame")) {
}

Upvotes: 3

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