Check existing event

Since jQuery 1.8, detecting existing event has been updated as below.

var events = $._data($("#button1").get(0), "events");
console.log((events) ? events.click[0] : null);
if (!events) {
    $("#button1").bind("click", function(e) {
        e.preventDefault();
        alert("clicked!");
    });
}

ref. http://blog.jquery.com/2011/11/08/building-a-slimmer-jquery/

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