[Solved] Change all prices (numbers) with 20% on webpage [closed]

by


Does the following help:

var currentMode = 1;
var discount = 0.20;
var reverseDiscount = 1/(1-discount);

function togglePrices() {
  var prices = document.getElementsByClassName("price");
  for (var i = 0; i < prices.length; i++) {
    var individualPrice = prices[i].innerHTML.substring(1);
    
    if(currentMode == 1) {
      individualPrice = parseFloat(individualPrice) * (1-discount);
    } else {
      individualPrice = parseFloat(individualPrice) * reverseDiscount;
    }

    prices[i].innerHTML = "$" + individualPrice;
  }
  currentMode = (++currentMode) % 2;
}
<!DOCTYPE html>
<html>
<head>
</head>
<body>
  <table border="1">
    <tr>
      <td>1</td>
      <td>Item 1</td>
      <td><span class="price" >$40</span></td>
    </tr>
    <tr>
      <td>2</td>
      <td>Item 2</td>
      <td><span class="price" >$20</span></td>
    </tr>
    <tr>
      <td>3</td>
      <td>Item 3</td>
      <td><span class="price" >$50</span></td>
    </tr>
  </table>
</body>


<button type="button" onclick="togglePrices()">Toggle Discounts</button>
</body>
</html>

2

solved Change all prices (numbers) with 20% on webpage [closed]