Javascript Closure For Jquery Event Handler

I have a list of objects each of which has a .bullet which is a SPAN. I want to bind a click on the span to a handler than performs a certain action on the span using jQuery. I'm

Solution 1:

Try this:

for (var i = 0 ; i< length ; i++) {
    (function(index){
        var dataNode = dataNodeList[index];

        var handler = function() {
            dataNode.bullet.firstChild.nodeValue = "- ";
        };

        $(dataNode.bullet).on("click",handler);
    })(i);
}

The closure defines a new scope. This is necessary because your handler isn't called until after the loop has finished, so i is not part of the scope at the time it is called, or (in some cases) has the last possible value from the loop.