Overwritten “this” variable problem or how to call a member function?

Question

I have this class where I am using a combination of jQuery and Prototype:

var MyClass = Class.create({
    initElements: function(sumEl) {
       this.sumEl          


        

Answer 1

You need to use closures.

 initElements: function(sumEl) {
        this.sumEl = sumEl;
        var ref = this;
        sumEl.keyup( function(){ref.updateSumHandler();});
 },