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How to get the entire HTML document as a string in JavaScript ?

  • Last Updated : 13 Apr, 2021

Given an HTML document, the task is to get the entire document as a string using JavaScript. Here few methods are discussed: 
 

  • getElementsByTagName() Method 
    This method returns a set of all elements in the document with the defined tag name, as a NodeList object. 
    This object represents a collection of nodes, Which are accessed by index numbers. The index starts at 0. 
    Syntax: 
     
document.getElementsByTagName(tagname)
  • Parameters: 
    • tagname: This parameter is required. It specifies the tagname of the elements to get. 
       
  • HTML DOM innerHTML Property 
    This property set/return the HTML content (inner HTML) of an element. 
    Syntax: 
    • Return the innerHTML property: 
       
HTMLElementObject.innerHTML
  • Set the innerHTML property: 
     
HTMLElementObject.innerHTML = text
  • text: It specifies the HTML content of an element. 
     

Example 1: This example gets the whole document as string using document.documentElement.innerHTML
 

html




<!DOCTYPE html> 
<html>
 
<head>
    <title>
        JavaScript | Get the entire document HTML as a string.
    </title>
</head>
 
<body style="text-align:center;" id="body">
    <h1 style="color:green;"
            GeeksforGeeks 
        </h1>
    <p id="GFG_UP" style="font-size: 15px; font-weight: bold;">
    </p>
 
    <button onclick="GFG_Fun(); ">
        click here
    </button>
    <script>
        var up = document.getElementById('GFG_UP');
        up.innerHTML = 'Click on the button to convert whole document to string';
 
        function GFG_Fun() {
            var string = document.documentElement.innerHTML;
            alert(string);
        }
    </script>
</body>
 
</html>

Output: 
 

  • Before clicking the button: 
     

  • After clicking the button: 
     



Example 2: This example gets the whole document by first selecting the elements with tagname ‘HTML’ and selecting the first element by indexing using document.getElementsByTagName(‘html’)[0].innerHTML.
 

html




<!DOCTYPE html> 
<html>
 
<head>
    <title>
        JavaScript | Get the entire document HTML as a string.
    </title>
</head>
 
<body style="text-align:center;" id="body">
    <h1 style="color:green;"
            GeeksforGeeks 
        </h1>
    <p id="GFG_UP" style="font-size: 15px; font-weight: bold;">
    </p>
 
    <button onclick="GFG_Fun(); ">
        click here
    </button>
    <script>
        var up = document.getElementById('GFG_UP');
        up.innerHTML = 'Click on the button to convert whole document to string';
 
        function GFG_Fun() {
            var string = document.getElementsByTagName('html')[0].innerHTML;
            alert(string);
        }
    </script>
</body>
 
</html>

Output: 
 

  • Before clicking the button: 
     

  • After clicking the button: 
     

 

Supported Browsers:

  • Google Chrome
  • Mozilla Firefox
  • Internet Explorer
  • Safari
  • Opera

 

Attention reader! Don’t stop learning now. Get hold of all the important Comcompetitivepetitve Programming concepts with the Web Design for Beginners | HTML  course.




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