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How to change style/class of an element using JavaScript ?

How to change font-weight of a text using JavaScript ?

Last Updated : 25 Dec, 2020

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In this article, we will set the font-weight of a text dynamically using JavaScript. Ti change the font weight dynamically, we use HTML DOM Style fontWeight property.

Syntax:

object.style.fontWeight = "value"

Property Values:

normal: The font weight is the default value.
lighter: The font weight is the lighter than normal.
bold: The font weight is bolder than normal.
bolder: The font weight is bolder than bold.
value: It defines from 100 to 900 where 400 is normal value.
initial: It sets to its default font weight.
inherit: It inherits this property from its parent element.

Example:

HTML

   <!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        How to change font-weight of 
        a text using JavaScript? 
    </title> 
</head> 
  
<body style="text-align: center;"> 
  
    <h1 style="color: green"> 
        GeeksforGeeks 
    </h1> 
  
    <h2> 
        How to change font-weight of 
        <br>a text using JavaScript? 
    </h2> 
  
    <p id="sudo">Welcome to GeeksforGeeks</p> 
  
    <br> 
  
    <button type="button" onclick="myGeeks()"> 
        Click to change 
    </button> 
  
    <script> 
        function myGeeks() { 
            document.getElementById("sudo") 
                .style.fontWeight = "bold"; 
        }  
    </script> 
</body> 
  
</html>
 
  

Output:

Before Click the Button:

After Click the Button:

Supported Browsers:

Google Chrome
Internet Explorer
Mozilla Firefox
Opera
Safari

How to change style/class of an element using JavaScript ?

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Article Tags :

JavaScript
Web Technologies
JavaScript-Questions

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