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[inverse-tax] / tax_ui.js
1 "use strict";
2
3 function load_tax_table(table_id, deductible_id = null) {
4 const deductible = deductible_id == null ? 0.0 : parseFloat(document.getElementById(deductible_id).value);
5 return apply_deductible(parse_tax_table(document.getElementById(table_id).value), deductible);
6 }
7
8 function format_number(n) {
9 return n.toLocaleString('en', {useGrouping:true, style: 'currency', currency: 'USD'});
10 }
11
12 function calculate() {
13 const table1 = load_tax_table('tax_table_1', 'deductible_1');
14 const table2 = load_tax_table('tax_table_2', 'deductible_2');
15 const after_tax = parseFloat(document.getElementById('after_tax').value);
16
17 const before_tax = invert(merge_tax_tables(table1, table2))(after_tax);
18
19 const tax1 = tax(table1, before_tax);
20 const tax2 = tax(table2, before_tax);
21
22 document.getElementById('before_tax').textContent = format_number(before_tax);
23 document.getElementById('tax_1').textContent = format_number(tax1);
24 document.getElementById('tax_2').textContent = format_number(tax2);
25 document.getElementById('after_tax_verification').textContent = format_number(before_tax - (tax1 + tax2));
26 }