how to make Javascript setTimeout returns value in a function

Question

I have a function that calls some service and returns the response. If the response is FALSE, it waits 1 second to ask the service again (which then probably returns TRUE).<

Answer 1

You should use a callback function when you expect a result from the service.

Like this :

function checkService(callback) {

    //this may return TRUE or FALSE
    var RET = someServiceResponse();

    // here waits 1 second, then ask the service again
    if( RET == true ) {
        callback(RET);
    } else {

        setTimeout(
                function() {
                    //it must return the second response of the service
                    RET = someServiceResponse();
                    callback(RET);
                },
                1000
        );

        // I want the checkService() return the response after de timeout
        return RET;
    }
}

So when you want to call the service, you just need to do :

checkService(function(status){
    alert(status);

    // Here some code after the webservice response
});