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Asked: 2026-05-27T22:49:11+00:00

I am trying to extend some existing functionality so it has a callback function

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I am trying to extend some existing functionality so it has a callback function that passes the original object as a parameter, or at least any public variables that is stored in a smaller object, how can I achieve this?

This is a simplified version of the file I am working with, a class would be contained in a variable

<html>
<head>
</head>
<script>

var foo = new Foo ({
    arg1:1,
    onComplete: function(){
        alert("complete " + total);
    }
});

</script>
<body>
</body>
</html>

The function / class looks similar to this

function Foo(options) {
    // private
    var number1_ = options.arg1;
    var number2_ = 10;
    var total_ = number1_ + number2_;

    // public
    this.total = total_;

    (function Foo() {
        if (options) {
            if (options.onComplete && typeof (options.onComplete) === "function") {

                // how do I pass Foo or an object of selected variables here?
                options.onComplete();
            }
        }
    })();
}

Thanks

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1 Answer

  1. Editorial Team

    Check this out 🙂

    function Foo(options) {
    // private
    var number1_ = options.arg1,
        number2_ = 10,
        total_ = number1_ + number2_;
    // public
    this.total = total_;

    (function Magazine( that ) {

        (options.onComplete || function(){}).call( that );

    })(this);
}

var foo = new Foo({
    arg1: 1,
    onComplete: function() {

        alert("complete " + this.total);
    }
});

    Live demo:
    http://jsfiddle.net/P3bzM/

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