CODEWITHSUNDEEP
google-chrome-extensionlocal-storage
Dev.K.
Dev.K.

Reputation: 2488

Chrome Extension sendRequest and Return the response

I'm developng a chrome extension. I have a function which retrieve a JOSN string from Local Storage and return it.

It not working properly, Here is my code.

function getstore()
{
    var all = {};
    chrome.extension.sendRequest({method: "getlist", key: "" }, function(response) {
        all = JSON.parse(response.data);
        console.log(all); //it prints the JSON properly
        return all; //
    });
}

But whenever I'm calling that function like this :

var old_a = getstore();// old_a should hold the JSON returned by getstore()
console.log(old_a);

But here the value of "old_a" is becoming undefined.

Upvotes: 0

Views: 570

Answers (1)

Mario S
Mario S

Reputation: 11945

Actually you are not returning anything from the method getstore().

The sendRequest method has a callback function that it calls when the asynchronous function is finished. The method signature looks like this:

chrome.extension.sendRequest(options, responseCallback)

So the responseCallback is the function you added as the last parameter.

function(response) {
    all = JSON.parse(response.data);
    console.log(all); //it prints the JSON properly

    return all; // No sense in returning from a callback method, it will do nothing and will never be catched anywhere.
}

So what you would want to do is:

function getstore()
{
    chrome.extension.sendRequest({method: "getlist", key: "" }, function(response) {
        var old_a = JSON.parse(response.data);

        // Use the json object here.
        console.log(old_a); 
    });
}

Upvotes: 1

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