Local Variable of a Method into an External Function

Question

How can I get the value of the quantity local variable for the valueChanged method of functionName1 into functionName2 and assign it to a local variable within that?

var functionName1 = function() {
    $newCheckoutNumberPicker.WanSpinner({
        maxValue: 99,
        minValue: 0,
        valueChanged: function(ele, val) {
            var quantity = val              
        }
    });    
}

var functionName2 = function() {
    var test1 = "";
    functionName1();
}

Call functionName2() from within the valueChanged function, passing val as a parameter — Rory McCrossan
– Rory McCrossan, Commented Nov 9, 2016 at 14:51
Check javascript closues.. You will get fair Idea of how this works.. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures — Atul Sharma
– Atul Sharma, Commented Nov 9, 2016 at 14:54
@Roger can you confirm you need to know the value at time of valueChanged, or just the value itself, which, assuming you're using wan-spinner, you can get with $newChecjoutNumberPicker.val() (ie is this an XY Problem?) — fdomn-m
– fdomn-m, Commented Nov 9, 2016 at 15:13

Tân · Accepted Answer · 2016-11-09 14:52:01Z

4

You can use callback function:

var functionName1 = function(callback) {
    $newCheckoutNumberPicker.WanSpinner({
        maxValue: 99,
        minValue: 0,
        valueChanged: function(ele, val) {
            callback(val)       
        }
    });    
}

var functionName2 = function() {
    var test1 = "";
    functionName1(function (quantity) {
        // ...
    });
}

answered Nov 9, 2016 at 14:52

Tân

1

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Comments

user2345 · Accepted Answer · 2016-11-09 14:51:24Z

0

valueChanged: function(ele, val) {
    myFunc(val);
 }

And then use the val variable when the value is changer in your fonction.

answered Nov 9, 2016 at 14:51

user2345

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Comments

I wrestled a bear once. · Accepted Answer · 2016-11-09 14:54:08Z

0

Make it ~~global~~ in a higher scope.

$(function(){
    var quantity;

    var functionName1 = function() {
        $newCheckoutNumberPicker.WanSpinner({
            maxValue: 99,
            minValue: 0,
            valueChanged: function(ele, val) {
                quantity = val              
            }
        });
    }

    var functionName2 = function() {
        alert(quantity);
    }
});

edited Nov 9, 2016 at 14:54

answered Nov 9, 2016 at 14:51

I wrestled a bear once.

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10 Comments

Rory McCrossan Over a year ago

Global variables are bad, mmmkay.

Liam Over a year ago

They really are stackoverflow.com/questions/10525582/…

fdomn-m Over a year ago

@Iwrestledabearonce. at least you updated unlike some of the other "answers" :)

ste2425 Over a year ago

If valueChanged is an async method which i assume it is for the need of the callback then this is rather brittle. If you call functionName2 before valueChanged calls-back you will get the wrong value. Which means you need to know when valueChanged has been called, which means you may as well pass a callback in or wrap in a promise.

fdomn-m Over a year ago

"My" example? Not me

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