How to use the return value of function in its own callback function?

Question

I have this code:

$('#from_country').change(function () {
    var selected_from = $(this).find('option:selected');
    var country = roaming_prices_from(selected_from.val(), function () {
        console.log(country);
    });

How can I use the return value of roaming_prices_from inside of its own callback function?

Passing the value as argument to the callback is the responsibility of roaming_prices_from. You must change this function, or don't use the function as callback (i.e. callback(roaming_prices_from(selected_from.val()));) — Denys Séguret
– Denys Séguret, Commented Feb 28, 2017 at 12:05
Why can't you just pass the country to callback method when invoking it from roaming_prices_from method? — Satpal
– Satpal, Commented Feb 28, 2017 at 12:05
like such: var country = roaming_prices_from(selected_from.val(), function (country) { console.log(country); }); ? This dosnt seem to work, but if this is correct. Then I might have a fault somewhere else. — mrfr
– mrfr, Commented Feb 28, 2017 at 12:06

hassan · Accepted Answer · 2017-02-28 12:07:11Z

2

by passing the returning value of your function as a callback parameters ,

$('#from_country').change(function () {
    var selected_from = $(this).find('option:selected');
    var country = roaming_prices_from(selected_from.val(), function (xCountry) {
        console.log(xCountry);
    });
});

but to do this you have to pass a value inside your roaming_prices_from function

we will assume that the function roaming_prices_from will be as following :-

function roaming_prices_from(value, callback) {
    .....
    callback(returnedValue);
    .....
    return returnedValue;
}

answered Feb 28, 2017 at 12:07

hassan

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Comments

Tom Teman · Accepted Answer · 2017-02-28 12:08:32Z

0

You need to assume that roaming_prices_from will resolve with the country value, i.e that function will have Promise.resolve(country), which then means your callback (that prints out country) will receive country as a paramter

answered Feb 28, 2017 at 12:08

Tom Teman

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