Convert Object Array to an Object

Question

I have a returned object list: data.d[15]

and one sample of it:

data.d[3] = {
CityId: 2,
CityName: "Ankara"}

I want to convert it to one object as

cities{
1: "Istanbul",
2: "Ankara",
3: "New York"
}

And it should be generic, so I dont know the "CityId" and "CityName" field names. what is the best method for it?

thank you all... i have send fieldnames by field object -no dependencies important for this code-, it has been resolved.

            var url = this.options.url + "/" + field.values,
                id = field.fieldId,
                title = field.fieldTitle;

            this.getJSON(url, {}, function (rData) {
                var obj = {};

                for (i = 0; i < rData.d.length; i++)
                    obj[rData.d[i][id]] = rData.d[i][title];

                $("#" + parentId).html(self.getHtmlOfFormData(type, obj));
            });

if you don't know CityName, then how are we supposed to know what to project? — Daniel A. White
– Daniel A. White, Commented Jun 7, 2012 at 12:05
I can't really see a correlation between those two pieces of data and how it can be generic. Perhaps you need to be more specific. — Jivings
– Jivings, Commented Jun 7, 2012 at 12:05
I just want to get first value as ID and second value as Val without FieldName dependency. — efirat
– efirat, Commented Jun 7, 2012 at 12:10
@kirlisakal There is no "first" or "second" value in an object. The order of the keys depends on the implementation of the browser. — Andreas
– Andreas, Commented Jun 7, 2012 at 12:21
@kirlisakal Unfortunately, you can't be sure about the order of the properties when you iterate on them. You need to check their type. — MaxArt
– MaxArt, Commented Jun 7, 2012 at 12:25

MaxArt · Accepted Answer · 2012-06-07 12:28:36Z

2

Maybe you need to detect which property contains the name of the city. Maybe something like this can work?

var idprop, nameprop;
for (var prop in data.d[0]) {
    if (typeof data.d[0][prop] === "string") nameprop = prop;
    if (typeof data.d[0][prop] === "number") idprop = prop;
}

var cities = {};
for (var i = 0; i < data.d.length; i++)
   cities[data.d[i][idprop]] = data.d[i][nameprop];

Keep in mind that this works if:

data.d isn't an empty array;
there's just one string property that contains the city name;
there's just one numeric property that contains the city id.

edited Jun 7, 2012 at 12:28

answered Jun 7, 2012 at 12:18

MaxArt

22.8k10 gold badges85 silver badges82 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Chango Over a year ago

i + 1 should be data.d[i].CityId

MaxArt Over a year ago

@Chango Maybe, but we need confirmation from kirlisakal

efirat Over a year ago

hey thank you much... I have solved the problem as I get the fieldnames by variant, cuz id's type is not allways numeric.

jbabey · Accepted Answer · 2012-06-07 12:48:04Z

1

if i understood your question, you are trying to convert some ajax return that looks like this:

data.d = [
    {
        cityId: someNumber1,
        cityName: someName1
    },
    {
        cityId: someNumber2,
        cityName: someName2
    }
];

into an object that looks like this:

cities = {
    someNumber1: someName1,
    someNumber2: someName2
};

a snippet like this would do the trick:

var cities = {};
for (var i = 0; i < data.d.length; i++) {
    cities[data.d[i].cityId] = data.d[i].cityName;
}

answered Jun 7, 2012 at 12:48

jbabey

46.7k12 gold badges73 silver badges94 bronze badges

Collectives™ on Stack Overflow

Convert Object Array to an Object

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related