Clever Geek Handbook

JS JSON Pair Key & Value

This is the best way to get key and value from JS object:

function jkey(p){for(var k in p){return k;}}
function jval(p){for(var k in p){return p[k];}}

var myobj = {'Name':'Jack'};

alert(jkey(myobj)+' equals '+jval(myobj));

Or is there a more direct or faster way?

I need to make it so that I can name the keyname and value separately. functions work and return the name and value of the key, I was just wondering if there was a smaller, faster and better way.

Here's the best example: I want to get the key: value as separate variables ie {assistant: 'XLH'}, key = assistant, val = 'XLH';

I only use this when I know for sure that it is a pair and only returns one key and value.

formY={
    tab:[
        {
            tabID:'Main',
            fset:[
                    {
                        fsID:'Ec',
                        fields:[
                            {ec_id:'2011-03-002'},
                            {owner:'ECTEST'},
                            {assistant:'XLH'},
                            {ec_date:'14/03/2011'},
                            {ec_status:'Unreleased'},
                            {approval_person:'XYZ'},
                        ]
                    }
                ]
        }
        ]
}
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3 answers


It is best to avoid cycling the object twice. You can do it:

function getKeyValue(obj) {
    for(var key in obj) {
        if(obj.hasOwnProperty(key)) {
            return {key: key, value: obj[key]};
        }
    }
}


and call it with:

var kv = getKeyValue(obj);
alert(kv.key + ' equals ' + kv.value);
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To set an object from JSON in one line of code, I like to use the parseJSON jQuery method. Just pass in a JSON string and create an object for you. Then all you have to do is use your obj.Property object to access any value.



var myObj = '{"Name":"Jack"}';
var person = $.parseJSON(myObj);
alert(person.Name);  // alert output is 'Jack'
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I find your question a little unclear, but I suspect you are looking for:

var myobj = {'Name':'Jack'};

for(var k in myobj){
    if (myobj.hasOwnProperty(k)) {
        alert(k + ' equals ' + myobj[k]);
    }
}
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