code-boxx/0-JS-GST-VAT.MD

## 0-JS-GST-VAT.MD

      
    Raw
  

              0-JS-GST-VAT.MD
            
          
    JAVASCRIPT CALCULATE GST VAT

https://code-boxx.com/calculate-gst-vat-javascript/
LICENSE

Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

  
## tax-calc.css
* {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
table {
  border-collapse: collapse;
  margin-bottom: 10px;
}
table td {
  padding: 10px;
  border: 1px solid #ddd;
}
table input {
  width: 100%;
  padding: 5px;
}

## tax-calc.html
<!DOCTYPE html>
<html>
  <head>
    <title>Simple Tax Calculator</title>
    <meta charset="utf-8"?
    <link rel="stylesheet" href="tax-calc.css">
    <script src="tax-calc.js"></script>
  </head>
  <body>
    <form onsubmit="return tcalc();">
      <table>
        <!-- (A) ITEM PRICE -->
        <tr>
          <td>Price</td>
          <td>
            <input type="number" min="0" max="9999" step="0.01"
                   id="taxprice" required value="12.34">
          </td>
        </tr>

        <!-- (B) TAX PERCENTAGE -->
        <tr>
          <td>Tax Percentage</td>
          <td>
            <input type="number" min="1" max="100" step="1"
                   id="taxperc" required value="9">
          </td>
        </tr>

        <!-- (C) TAXABLE AMOUNT -->
        <tr>
          <td>Tax Amount</td>
          <td>
            <input type="text" readonly id="taxamt">
          </td>
        </tr>

        <!-- (D) TOTAL WITH TAX -->
        <tr>
          <td>Total With Tax</td>
          <td>
            <input type="text" readonly id="taxgrand">
          </td>
        </tr>
      </table>

      <!-- (E) GO! -->
      <input type="submit" value="Go!">
    </form>
  </body>
</html>

## tax-calc.js
function tcalc () {
  // (A) ITEM PRICE + TAX PERCENTAGE
  var price = parseFloat(document.getElementById("taxprice").value),
      percent = parseFloat(document.getElementById("taxperc").value);

  // (B) CALCULATE TAX AMOUNT
  var tax = (price / 100) * percent,
      grand = price * ((100 + percent) / 100);

  // (C) ROUND OFF
  // CREDITS - https://www.jacklmoore.com/notes/rounding-in-javascript/
  var roundoff = (amount, places) => {
    let ea = "e" + places,
        eb = "e-" + places;
    return Number(Math.round(amount + ea) + eb);
  };

  // (D) SET CALCULATED VALUES TO HTML FIELDS
  document.getElementById("taxamt").value = roundoff(tax, 2);
  document.getElementById("taxgrand").value = roundoff(grand, 2);
  return false;
}
	* {
	font-family: Arial, Helvetica, sans-serif;
	box-sizing: border-box;
	}
	table {
	border-collapse: collapse;
	margin-bottom: 10px;
	}
	table td {
	padding: 10px;
	border: 1px solid #ddd;
	}
	table input {
	width: 100%;
	padding: 5px;
	}
	<!DOCTYPE html>
	<html>
	<head>
	<title>Simple Tax Calculator</title>
	<meta charset="utf-8"?
	<link rel="stylesheet" href="tax-calc.css">
	<script src="tax-calc.js"></script>
	</head>
	<body>
	<form onsubmit="return tcalc();">
	<table>
	<!-- (A) ITEM PRICE -->
	<tr>
	<td>Price</td>
	<td>
	<input type="number" min="0" max="9999" step="0.01"
	id="taxprice" required value="12.34">
	</td>
	</tr>

	<!-- (B) TAX PERCENTAGE -->
	<tr>
	<td>Tax Percentage</td>
	<td>
	<input type="number" min="1" max="100" step="1"
	id="taxperc" required value="9">
	</td>
	</tr>

	<!-- (C) TAXABLE AMOUNT -->
	<tr>
	<td>Tax Amount</td>
	<td>
	<input type="text" readonly id="taxamt">
	</td>
	</tr>

	<!-- (D) TOTAL WITH TAX -->
	<tr>
	<td>Total With Tax</td>
	<td>
	<input type="text" readonly id="taxgrand">
	</td>
	</tr>
	</table>

	<!-- (E) GO! -->
	<input type="submit" value="Go!">
	</form>
	</body>
	</html>
	function tcalc () {
	// (A) ITEM PRICE + TAX PERCENTAGE
	var price = parseFloat(document.getElementById("taxprice").value),
	percent = parseFloat(document.getElementById("taxperc").value);

	// (B) CALCULATE TAX AMOUNT
	var tax = (price / 100) * percent,
	grand = price * ((100 + percent) / 100);

	// (C) ROUND OFF
	// CREDITS - https://www.jacklmoore.com/notes/rounding-in-javascript/
	var roundoff = (amount, places) => {
	let ea = "e" + places,
	eb = "e-" + places;
	return Number(Math.round(amount + ea) + eb);
	};

	// (D) SET CALCULATED VALUES TO HTML FIELDS
	document.getElementById("taxamt").value = roundoff(tax, 2);
	document.getElementById("taxgrand").value = roundoff(grand, 2);
	return false;
	}