CODEWITHSUNDEEP
javascriptfunctionvariablesscope
asteri
asteri

Reputation: 11572

Why can't I reference a variable within a custom object?

I'm just picking up Javascript, and I don't understand this problem.

I have created a custom object called DeleteReasonCodes with an instance variable called delReasonCodes, declared as an array. However, the inner methods can't seem to see this instance variable. Every time I try to run it, I get a delReasonCodes is not defined error.

Perhaps I'm just not understanding the Javascript scoping rules?

var DeleteReasonCodes = {

    delReasonCodes: [],

    get: function ()
    {
        return delReasonCodes;
    },

    add: function (code, desc)
    {
        delReasonCodes.push(new DeleteReasonCode(code, desc));
    }
};

Upvotes: 1

Views: 100

Answers (3)

user1171884
user1171884

Reputation:

If you do this

delReasonCodes: [],

get: function() {
    return this.delReasonCodes;
},

Upvotes: 0

Matt
Matt

Reputation: 41832

You're treating a JavaScript object as you would a class in another language. Local-scope in JavaScript only resides inside functions, not objects. In your case, you need to access the data with a fully-qualified name:

DeleteReasonCodes.delReasonCodes.push();

Upvotes: 1

Bergi
Bergi

Reputation: 664579

No, javascript scoping belongs to functions (and nothing else).

The only variable you have created is DeleteReasonCodes, and you have assigned it an object with 3 properties. You can access them via a property accessor operator if you have a reference to the object. In your case, you could use this.delReasonCode or DeleteReasonCodes.delReasonCode - see this answer for the difference.

Upvotes: 2

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