Testing for existence of a properties in JSON using javascript

Question

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 :)

You might want a var in that for...in statement. for (var buildingFrame in buildingNames) { — Andy E
– Andy E, Commented Feb 10, 2013 at 12:56

jAndy · Accepted Answer · 2013-02-10 12:55:48Z

3

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")) {
}

answered Feb 10, 2013 at 12:55

jAndy

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