CODEWITHSUNDEEP
javascriptjson
user3191903
user3191903

Reputation: 245

Dynamic Value in Javascript Object?

I have a object like as follows

var obj={
   userName:sessionStorage["userName"]
}

1st time if I try to access obj.userName i am getting undefined, because there is no value in it.

Now if I am getting undefined even after setting the value for it

sessionStorage["userName"]="name";
obj.userName;  //undefined

How to solve this ?

Upvotes: 1

Views: 161

Answers (2)

Amit Joki
Amit Joki

Reputation: 59232

You should do this:

sessionStorage["userName"]="name";
obj.userName = sessionStorage["userName"];
obj.userName;//name

Just changing the value of sessionStorage doesn't reflect the change to the object itself.

In order to change the object, you need to actually change the object.

Upvotes: 0

thefourtheye
thefourtheye

Reputation: 239473

userName takes the value of sessionStorage["userName"] at the time of its creation. Later changes to sessionStorage["userName"] will not be reflected in userName.

If you want to get sessionStorage["userName"] whenever you get value from userName, then you need to define a getter, like this

Object.defineProperties(obj, {
    userName: {
        get: function() {
            return sessionStorage["userName"];
        }
    }
});

Upvotes: 4

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