HTML content modification using Javascript

JavaScript is the dynamic, lightweight and most commonly computer programming language used to create a web pages. It interact with client side and make dynamic pages.

JavaScript Can Change Content of HTML page: The getElementById() method is used to get the id of element and change the HTML content.

Example:

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<!DOCTYPE html>
<html>
  
<head>
    <title>
        Change HTML Content using Javascript
    </title>
</head>
  
<body>
    <h1>
        GeeksforGeeks
    </h1>
      
    <h2>
        Change HTML Content using Javascript
    </h2>
      
    <p id="GFG">
        GeeksforGeeks: A computer science portal
    </p>
      
    <button type="button" onclick=
        'document.getElementById("GFG").innerHTML 
                ="Welcome to GeeksforGeeks"'>
        Click Here!
    </button>
</body>
  
</html>

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Output:


    

  • Before Clicking the button:
    

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  • After Clicking the button:
    

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JavaScript Can Change Styles of HTML page: JavaScript can be used to change the CSS property of HTML page.




Example:











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<!DOCTYPE html> 


<html> 


  


<head> 


    <title> 


        Change HTML Content using Javascript 


    </title> 


</head> 


  


<body> 


    <h1> 


        GeeksforGeeks 


    </h1> 


      


    <h2> 


        Change HTML Content using Javascript 


    </h2> 


      


    <p id="GFG"> 


        GeeksforGeeks: A computer science portal 


    </p> 


      


    <button type="button" onclick= 


        "document.getElementById('GFG').style.fontSize= 


                '25px'"> 


        Click Here! 


    </button> 


</body> 


  


</html> 



















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Output:


    

  • Before Clicking the button:
    

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  • After Clicking the button:
    

    • 



JavaScript Can Hide or Show HTML Elements: JavaScript can be used to change the display property to hide or show element content.


Example:











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                                    link

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                                    code
                                




















<!DOCTYPE html> 


<html> 


  


<head> 


    <title> 


        Change HTML Content using Javascript 


    </title> 


</head> 


  


<body> 


    <h1> 


        GeeksforGeeks 


    </h1> 


      


    <h2> 


        Change HTML Content using Javascript 


    </h2> 


      


    <p id="GFG"> 


        GeeksforGeeks: A computer science portal 


    </p> 


      


    <button type="button" onclick= 


        "document.getElementById('GFG').style.display= 


                'none'"> 


        Click Here! 


    </button> 


</body> 


  


</html> 



















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  • Output before clicking:
    

    • 

  • Output after clicking:
    

    • 



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