Question

Doing some work with Omniture analytics and want to be able to set some properties via JSON.

Omniture calls look something like this:

s.linkTrackVars = 'eVar37';
s.eVar37='foo';
s.tl(true, 'o');

I want to write a generic function to take a JSON object and convert it into those variables. AFAIK Omniture doesn’t allow you to simply pass it JSON, so this the only method I can think of.

Here’s the example of the JSON structure I want to use:

var omniture = {

    "evars":
    [
        {
            "key": "37",
            "value": "foo"
        },

        {
            "key": "32",
            "value": "bar"
        }
    ]

}

My function to work with this JSON looks like this:

for (i in omniture.evars) {
    var evar = omniture.evars[i];
    window[s.eVar + evar.key] = evar.value;
}
alert(s.eVar37); // alerts "undefined"

If I do this, it works:

for (i in omniture.evars) {
    var evar = omniture.evars[i];
    window['eVar' + evar.key] = evar.value;
}
alert(eVar37); // alerts "foo"

It seems that I can’t set a variable variable as a property of an object (eg s.eVar37 as opposed to evar37). Can anybody think of a nice way of setting these variables automatically?

thanks,
Matt

Answer 1

Sure you can. Just set it on s directly:

s['eVar' + evar.key] = evar.value;