JavaScript. Return variable with asynchronism

Question

JavaScript. Return variable with asynchronism

Navigation

#1 by (1 votes)
#2 by (-1 votes)

0

I'm creating a Chrome extension.

I have the following function that I want to return True or False depending on the message answered. OK true, otherwise false. The function that must return true / false is sendMsgToBackgroundChangeStatus ()

function sendMsgToBackgroundChangeStatus(){
chrome.runtime.sendMessage({'since':'popup', 'activo': !activo}, function(response){
        //alert("Popup: " + response.status);
        //console.log("Popup: " + response.status);
        return response.status;
    }
);
}
if (SendMsgToBackgroundChangeStatus()){
   //block code
} else {
   //block code
}

There are several problems. The first problem is the execution of the code asynchronously. The second I do not know how I can get the result of a function inside another function.

The idea is that according to the answer from endMsgToBackgroundChangeStatus () (True or False) the conditional block code is executed (if (SendMsgToBackgroundChangeStatus ()))

Any ideas?

Thanks in advance.

Greetings.

javascript jquery asincronismo chrome

asked by Enrique 26.02.2018 в 00:55

source

2 answers

Warning: mysqli_connect (): Inquiry about setting up a custom Menu in Wordpress

score 1 · Answer 1

Your problem is resolved with the use of promises.

function sendMsgToBackgroundChangeStatus() {
        return new Promise((resolve, reject) => {
            chrome.runtime.sendMessage({ 'since': 'popup', 'activo': !activo }, function (response) {
                response.status === 'VALID' ? resolve() : reject();
            });
        });
    }

    SendMsgToBackgroundChangeStatus()
        .then(() => console.log('ok'))
        .catch(() => console.log('fail'));

score -1 · Answer 2

-1

You can check this league:

link

Or you can also use libraries like Async or FutureJS to avoid callbacks hell.

And if you like, check this:

link

answered by 27.02.2018 в 00:54