Ver el código de «Calculators.js»

ui = {
    
    initPage: function () {
        console.log("Calculators Script loaded");
        
        //Calculator       
        var newInput = "<input type='number' class='input_amount target' value='1' max='50000' min='' />";
        ($('#input_amount')).html(newInput);
        var amountsArray = [];
        $('.item_number').each(function(index, element){
            amountsArray[index] = parseInt($(element).text);
        })
        $(".input_amount").on('change', function() {
            if(isNaN($(".amount_input") && $(".amount_input").value > 0)){
                var inputValue = $('.amount_input').value;
                $('.item_number').each(function(index, element){
console.log(amountsArray[index] * inputValue);
                    $(element).text(amountsArray[index] * inputValue);
                })
            }else{
                $('.item_number').each(function(index, element){
console.log(amountsArray[index] * inputValue);
                    $(element).text(amountsArray[index]);
                })
            }
        });
        
    },
    
  init: function () {
        ui.initPage();
    }
}

ui.init();