Codeigniter - sending json to script file

I query the db i my model like so

function graphRate($userid, $courseid){
    $query = $this->db->get('tblGraph');
        return $query->result();
}

My controller gets data back from my model and I json encode it like so

if($query = $this->rate_model->graphRate($userid, $courseid)){
    $data['graph_json'] = json_encode($query);      
}
$this->load->view('graph', $data);

And thats returns me a json object like so

[
 {"id":"1","title":"myTitle","score":"16","date":"2013-08-02"},
 {"id":"2","title":"myTitle2","score":"17","date":"2013-09-02"},
 {"id":"3","title":"myTitle3","score":"18","date":"2013-10-02"}
]

In my view graph I'm loading an js file

<script type="text/javascript" src="script.js"></script>

Now I want to use $data that is being sent from my controller to my view, to my external script.js to use as labels and data to feed my chart. But How do I get that Json data to my external script.js so I can use it?

1 more thing about the json data, isn't it possible to get the output of the json data as

{
 "obj1":{"id":"1","title":"myTitle","score":"16","date":"2013-08-02"},
 "obj2":{"id":"2","title":"myTitle2","score":"17","date":"2013-09-02"},
 "obj3":{"id":"3","title":"myTitle3","score":"18","date":"2013-10-02"}
}

The problem isn't a Codeigniter problem, it's a javascript scope/file inclusion/where-do-i-get-my-data-from problem.

I run into this all the time and have used these solutions:

1. naming my php files with .php extensions and loading them as if they're views.
2. Just putting the script that needs data from a view IN the view file where it's used
3. Using an ajax request in my included js file to hit a controller and get json data.

I use #2 most frequently (for things like datatables where I WANT the js code right there next to the table it's referencing.

I use #1 occasionally, but try NOT to do that because it means some .js files are in my webroot/js dir and some are in teh application/views directory, making it confusing for me or anyone else who wants to support this project.

#3 is sometimes necessary...but I like to avoid that approach to minimize the number of requests being made and to try to eliminate totally superfluous requests (which that is).