Get variables into outside the function

Question

I have one function, I am required to print the lastlockerbalance outside the function.

var getlockerbalance = function() {
    $http.get("php/selectLOCKERBALANCE.php").success(function(lockerbalance) {
        $scope.lockerbalance1 = lockerbalance;
        var lastlockerbalance = $scope.lockerbalance1[0].LOCKERBALANCE;
        console.log(lastlockerbalance);
    });
};
console.log(lastlockerbalance);

Showing error message as "lastlockerbalance is undefined".

Duncan · Accepted Answer · 2017-02-06 12:38:29Z

2

You can't. The .success() callback won't even have been called by the time your second console.log() function is called, in fact the request $http.get() call won't even send the request until after the getlockerbalance() function returns.

What you need to do is move the code that uses the value inside the callback.

answered Feb 6, 2017 at 12:38

Duncan

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1 Comment

GuyT Over a year ago

I do agree with you, but (window).lastlockerbalance will be set (not at the time the OP is printing it). Of course, it should be moved inside a callback.

oshell · Accepted Answer · 2017-02-06 14:53:13Z

0

You could either return a promise and use then() or pass a callback to the function.

Promise

function getlockerbalance() {
     return $http.get("php/selectLOCKERBALANCE.php").success(function(lockerbalance) {
        $scope.lockerbalance1 = lockerbalance;
        var lastlockerbalance = $scope.lockerbalance1[0].LOCKERBALANCE;
        return lastlockerbalance;
    });
};

getlockerbalance().then(function(result){
    console.log(result);
});

Callback

var getlockerbalance = function(callback) {
    $http.get("php/selectLOCKERBALANCE.php").success(function(lockerbalance) {
        $scope.lockerbalance1 = lockerbalance;
        var lastlockerbalance = $scope.lockerbalance1[0].LOCKERBALANCE;
        callback(lastlockerbalance);
    });
};

function printBalance(balance) {
    console.log(balance);
}

getlockerbalance(printBalance);

edited Feb 6, 2017 at 14:53

answered Feb 6, 2017 at 13:29

oshell

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2 Comments

Duncan Over a year ago

Your promise example needs to assign to lastlockerbalance in the outer scope: lastlockerbalance = getlockerbalance() though it might be better to give it a different name to distinguish the promise from the value.

oshell Over a year ago

yeah, I refactored. but he should get the idea.

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