how to access javascript object from a function?

Question

Let's say I have:

var test = {};
test.Data1 = {
    ...JSON objects here...
}; 
test.Data2 = {
    ...JSON objects here...
};
and so on...

I usually access these json objects followed by a set of calls by:

this.scope.testData = test['Data1'];

However, may data for test is getting larger so i just wanted to pass whatever data i want to a function and do the processing like:

this.scope.setupData = function(data)
{
    var fData = test[data]; // is this line correct? 
    ...
    ...
    return fData;

};

but it's not working. I'm getting :Cannot set property "fData" of undefined to "[object Object]" ... I'm new to javaScript, any help would be appreciated.

That's the exact wording of the error? Sure seems like you're leaving out a bunch of important information. — user2437417
– user2437417, Commented Jul 1, 2013 at 4:41
Looks like you're trying to use data as a property name... but data is an Object. — user2437417
– user2437417, Commented Jul 1, 2013 at 4:44

Ast Derek · Accepted Answer · 2013-07-01 04:45:53Z

1

The problem is the scope inside this.scope.setupData. To access the variables relate to this.scope you need to use this again:

/**
 * At current scope, "this" refers to some object
 * Let's say the object is named "parent"
 *
 * "this" contains a property: "scope"
 */
this.scope.setupData = function(data)
{
    /**
     * At current scope, "this" refers to "parent.scope"
     *
     * "this" contains "setupData" and "testData"
     */
    var fData = this.testData[data]; // is this line correct? 
    ...
    ...
    return fData;
};

answered Jul 1, 2013 at 4:45

Ast Derek

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