How to replace the entire HTML node using JavaScript ? - GeeksforGeeks

23 Jan, 2020
Given an HTML document and the job is to replace the entire HTML element by a new one with the help of JavaScript. A few approaches are discussed here.
Approach 1:
Take the new document as a form of string(eg.. Str = ‘< html > < /html > ‘).
Use .replace() method on HTML element and replace it with the new HTML Document(eg.. $(‘html’).html(Str)).
Example 1: This example implements the above approach.
<!DOCTYPE HTML><html>  <head>    <title>        Replace the entire HTML node using JavaScript.    </title>    <script src= "https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">    </script>    <style>        #div {            background: green;            height: 100px;            width: 200px;            margin: 0 auto;            color: white;        }    </style></head>  <body style="text-align:center;">    <h1 style="color:green;">              GeeksForGeeks          </h1>    <p id="GFG_UP">    </p>    <button onclick="GFG_Fun();">        click here    </button>    <p id="GFG_DOWN" style="color: green;">    </p>    <script>        var up = document.getElementById('GFG_UP');        var down = document.getElementById('GFG_DOWN');        up.innerHTML =  "Click on the button to replace the entire HTML element.";          function GFG_Fun() {            var Str = '<!DOCTYPE HTML><html><head><title>Check if an element is a'+' div in JavaScript.</title></head><body style = "text-align:center;">'+'<h2 style = "color:green;">GeeksForGeeks</h2><p>This is replaced element.'+                '</p></body>  </html>';            $('html').html(Str);        }    </script></body>  </html>
Output:
Before clicking on the button:
After clicking on the button:
Approach 2:
Take the new document as a form of string(eg.. Str = ”).
Use .open() method on document and this method takes 2 parameters(first is “text/html” and second is “replace”). If we don’t use ‘Replace’ then method will call adds page history. So we would have to click back two times to go to the previous page. So, replace is necessary argument to pass.
To this new document use .write() method and pass the new document.
Use .close() method on document for it to work.
Example 2: This example implements the above approach.
<!DOCTYPE HTML><html>  <head>    <title>       Replace the entire HTML node using JavaScript.    </title>    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">    </script>    <style>        #div {            background: green;            height: 100px;            width: 200px;            margin: 0 auto;            color: white;        }    </style></head>  <body style="text-align:center;">    <h1 style="color:green;">              GeeksForGeeks          </h1>    <p id="GFG_UP">    </p>    <button onclick="GFG_Fun();">        click here    </button>    <p id="GFG_DOWN" style="color: green;">    </p>    <script>        var up = document.getElementById('GFG_UP');        var down = document.getElementById('GFG_DOWN');        up.innerHTML = "Click on the button to replace the entire HTML element.";          function GFG_Fun() {            var Str =                 '<!DOCTYPE HTML><html><head><title>Check if an element is a div'+                ' in JavaScript.</title></head><body style = "text-align:center;">'+                '<h2 style = "color:green;">GeeksForGeeks</h2><p>'+                'This is replaced element.</p></body>  </html>';            var newHTML = document.open("text/html", "replace");            newHTML.write(Str);            newHTML.close();        }    </script></body>  </html>
Output:
Before clicking on the button:
After clicking on the button:
JavaScript-Misc
JavaScript
Web Technologies
Web technologies Questions
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
Remove elements from a JavaScript Array
Convert a string to an integer in JavaScript
Difference between var, let and const keywords in JavaScript
Differences between Functional Components and Class Components in React
How to append HTML code to a div using JavaScript ?
Remove elements from a JavaScript Array
Installation of Node.js on Linux
Convert a string to an integer in JavaScript
How to fetch data from an API in ReactJS ?
How to insert spaces/tabs in text using HTML/CSS?