JSON with Dynamic Coding

Question

Using this to load the json

var jsonParsed = JSON.parse(localStorage.getItem('test'));

Using this to save

var jsonData = ko.toJSON(viewModel);

Now when readying it in i know i can get my values like sooo...

jsonParsed.AOfficer

(if A officer was a feild with a value) I know that the above code would return the value of the json feild AOfficer but how do i get it to return the name of all the feilds in a json e.g returning that it holds Aofficer rather than its value.

Im wanting to know this because im dynamicly creating forms using the json feild name for the form id and value for form value.

Thanks

Note that your problem has nothing to do with JSON. JSON is just a textual representation of data. You seem to be asking for a way to access object properties with unknown names. Reading MDN - Working with Objects might be helpful as well. — Felix Kling
– Felix Kling, Commented Jun 14, 2012 at 15:09

Bruno · Accepted Answer · 2012-06-14 15:27:43Z

2

Assuming that jsonParsed is something like:

var field = {
    "field1": "Test data",
    "field2": "Test data"
};

You could do:

for(var field in fields){
    if(fields.hasOwnProperty(field)){
        console.log(field, fields[field]);
    }
 };

That iterates trough all the top-level object props and returns its name, and value.

edited Jun 14, 2012 at 15:27

answered Jun 14, 2012 at 15:06

Bruno

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1 Comment

Eliran Malka Over a year ago

+1, but please edit your code to add local assignment to the loop index, as to prevent it from leaking to the global scope (i.e. for(var field in fields)).

Oleg V. Volkov · Accepted Answer · 2012-06-14 15:02:20Z

1

Use for in loop with optional .hasOwnProperty check to loop over object's properties.

answered Jun 14, 2012 at 15:02

Oleg V. Volkov

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1 Comment

Adam Jenkins Over a year ago

Absolutely correct answer. But just for clarification it's done like this: for(i in jsonParsed) { if(jsonParsed.hasOwnProperty(i) { console.log('Field name: '+i); console.log('Field value: '+jsonParsed[i]); } }

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