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How to use JavaScript variable in HTML if condition | Example code

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You can use if statement or ternary operator to use JavaScript variable in HTML. Ternary expressions will always return the first value if true, the second value if not.

var B = (A ==="red") ? "hot":"cool";

Great for one-off if/else statements, but if you get into more nested conditions, be sure to use the traditional if/else blocks for readability.

Use JavaScript variable in HTML if the condition

Simple example code.

<!DOCTYPE html>
<html>
<head>
  <script>
    var color = "red";
    var B = (color ==="red") ? "hot":"cool";
    
  </script>
</head>

<body>

  <script>
    document.write(B)
  </script>

</body>
</html>

Output:

How to use JavaScript variable in HTML if condition

Using if condition

Initialize your variables first, then compare using the if statement and assign new values where necessary.

<script>
    var color = "red";
    var b;
    if(color=="red"){
      b="hot";
    }
    else{
      b="cold";
    }
    
</script>

Do comment if you have any doubts or suggestions on this JS variable with the condition code.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

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