User-defined callback function is being fired multiple times in Javascript/jQuery

Question

There are some similar questions, but they all seem like regarding native jQuery callback functions.

So I have this code which (live) creates a div containting some form elements. Values of these elements should be retrieved inside a callback function when (before) the div is removed.

function popup(callback) {
    // ...
    // before removing the div
    callback.call();

    // remove div
}

Unexpectedly, the callback function is being fired multiple times (increasingly) after the first time popup is executed.

I have simplified the code, and here is the fiddle.

Answer 1

I hope this is what you need.

function popup(callback) {
    $("body").append('<div><span id="test">test</span> <a href="#" id="close">close</a></div>');
    $(document).on("click", "#close", function() {
        callback.call();

        //
        //callback = function() {};
        $(document).off("click", "#close");
        $("div").remove();

    });
};

$(document).on("click", "#open", function() {
    popup(function() {
        alert('$("#test").length = ' + $("#test").length);
    });
});

Basically, you need to remove event handler by invoking off() method.