Using Client Context Data in a component

In the reference docs -- it states (see below)

Are you passing a valid session store as an argument to this method?   It looks like there is an issue with locstore. 

Returns a session store of a specified name. See also Accessing a Session Store.

Thanks Scott.

I tried the link you mentioned for accessing a session store. However could not be successful. Let me give some more details :

1. I want to track users' location and based on it render my custom component. The user is an anonymous site visitor.
2. I focused on OOB stores such as profile, surferinfo and geolocation (geolocation was of improtance to me to certain extent) and realized that if these contextstore components are dragged on client context of a page (geometrixx/en.html), the resultant data is stored in browser's "localstorage". Thus for my usecase of geo tracking, I could extract the localstorage object in JSON and parse it further to extract "geolocation" store. These stores (geolocation, surferinfo, profile) are saved against a key "ContextHubPersistence" in browser's localstorage object.

Problem:

1. As my customers might use older browsers as well i.e. IE8/7, AEM's out-of-box "geolocation" store wont work for me as I understand it essentially uses HTML5 geolocation APIs.
2. Thus what I want do is to create a custom store of JSONP type which would use a third party service (such as WIPMANIA or similar 3rd party geo IP) in client context
3. Having said that, I have observed, that although in authoring mode, Client Context interface populates and shows the correct value in Client Context pop up (once I edit Client Context and drag / drop the customstore in it for the geometrixx/en.html), I dont see this custom store shown in either "Cookie, Localstorage, Session Storage or even geometrixx/en,html's HTTP header

I have tried the link you mentioned to access session store data in my custom AEM component's JSP. I have also tried following code (by going through CQ Widget API doc):

var store = CQ_Analytics.StoreRegistry.getStore("locstore");

    if (!store) {
            store=CQ_Analytics.JSONPStore.registerNewInstance("locstore", "http://api.wipmania.com/jsonp?callback=${callback}", {});
    }

console.log("Property - " + store.getProperty("latitude"));

I dont get any print of the property as if there is nothing exist. I also put checks on store.isInitiated() and if not then call store.init() but it always go into the if block for store.isInitialized() because of store creation check mentioned above (if(!store....)

If you can let me know what I am missing. It would be of great help.

Also, is there way I could let client context data written in HTTP header then I can use server side code to read it (instead of JS libs).

Thanks again.

Anand