javascript - chrome.storage.local.get and set

I'm trying to use chrome.storage.local in my extension, and it doesn't seem to work. I used localStorage but realized that I can't use it in content scripts over multiple pages.

So, this is what I've come up with:

function save()
{
    var channels = $("#channels").val();

    var keywords = $("#keywords").val();

    chrome.storage.local.set({'channels': channels});
    chrome.storage.local.set({'keywords': keywords});
}

I do believe I'm doing the save() right, but the problem comes up in load():

function load()

{
    var channels = "";
    chrome.storage.local.get('channels', function(result){
        channels = result;
        alert(result);
    });

    var keywords = "";
    chrome.storage.local.get('keywords', function(result){
        keywords = result;

        alert(result);
    });

    $("#channels").val(channels);
    $("#keywords").val(keywords);
}

When the alerts trigger, it prints out [object Object]. Why is that? What am I doing wrong? I looked at the documentation/examples, but I can't seem to pinpoint the problem.

Answer

This code works for me:

function load() {
    var channels = "";
    var keywords = "";
    chrome.storage.local.get('channels', function (result) {
        channels = result.channels;
        alert(result.channels);
        $("#channels").val(channels);
    });

} 

Chrome.storage.local.get() returns an object with items in their key-value mappings, so you have to use the index of the key in your search pattern.

IMP:

Thanks to Rob for identifying: Chrome.storage.local.get() is asynchronous, you should modify your code to ensure they work after callback() is successful.

Let me know if you need more information.