Total a list of dom elements and put the output in a destination

Totalizer.js

function Totalizer() {
    this.output = null
    this.elements = []
    this.total = 0

}
Totalizer.prototype.setOutput = function (output) {
    this.output = $(output);
    this.updateOutput()
}
Totalizer.prototype.updateOutput = function(){
    total = 0
    for (var i = 0; i < this.elements.length; i++) {
        var ele = this.elements[i]
        try {
            var num = parseFloat(ele.val())
            if (isNaN(num)) {
                num = 0
            }
            total += num
        } catch (error) {
            console.error(error);
        }
    }
    this.output.val((Math.round(total * 100) / 100).toFixed(2));
    this.output.change()
}
Totalizer.prototype.change = function (event) {
    this.updateOutput()
    event.target.value = parseFloat(event.target.value).toFixed(2);
};

Totalizer.prototype.attach = function (lst_elements) {
    for (var i = 0; i < lst_elements.length; i++) {
        var ele = $(lst_elements[i]);
        ele.change(this.change.bind(this))
        this.elements.push(ele)
    }
    this.updateOutput()
}