Apply an IF condition to every element in an HTML table with JavaScript?

For this, you can use document.querySelectorAll.forEach().

Example

Following is the code −

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Document</title>
</head>
<link rel="stylesheet"
href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<body>
   <table>
      <tr>
         <td class="demo"> Java </td>
      </tr>
      <tr>
         <td class="demo"> MySQL </td>
      </tr>
      <tr>
      </tr>
   </table>
</body>
<script>
   document.querySelectorAll(".demo").forEach(function (obj) {
      if (obj.innerText.trim() === "MySQL") {
         obj.innerText = "Javascript";
      }
      if (obj.innerText.trim() === "MongoDB") {
         obj.innerText = "Python";
      }
   });
</script>
</html>

To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor.

Output

This will produce the following output −

Apply an IF condition to every element in an HTML table with JavaScript?