$("#calculate").click(function(){ var items = $('#items').val().split(", "); var computation = 0; var coefficient = 0; if(items && items.length > 0){ var smallest = parseFloat(items[0]); var largest = parseFloat(items[0]); for(var i = 0; i < items.length; i++) { if(parseFloat(items[i]) > largest){ largest = parseFloat(items[i]); } if(parseFloat(items[i]) < smallest){ smallest = parseFloat(items[i]); } } computation = largest - smallest; coefficient = (computation * 1.0) / (largest + smallest); } $('#result').html('Range = ' + computation + '
Coefficient of Range = ' + coefficient.toFixed(4)); }); $("input").change(function(){ var isInvalid = $('#itemDiv').hasClass('is-invalid'); if(isInvalid){ $("#add").prop("disabled", true); }else{ $("#add").removeAttr('disabled'); } }); $("#add").click(function(){ var items = $('#items'); var item = $('#item').val(); var list = items.val(); if(item && item.length > 0){ if(list && list.length > 0){ list += ', ' + item; }else{ list = item; } $('#itemList').append("" + item + ""); } items.val(list); });

Enter Item and Press Add Button.

Number required!
Items