Wednesday, December 6, 2023

Html - Render Html Dynamically into Frame without Hosting and Communicate from Parent

 In case we want to render Html dynamically into website as frame without hosting the Html into another website, we can use of this code Blob with createObjectURL to render dynamically,


Create Parent Website as below:

<html>

<head>

<script>

// This function will update the iframe src with the HTML code from the textarea

function renderHTML() {

   // Get the textarea element by its id

  var textarea = document.getElementById("html-code");

  // Get the iframe element by its id

  var iframe = document.getElementById("html-frame");

  // Create a blob object from the textarea value

  var blob = new Blob([textarea.value], {type: "text/html"});

  // Create a URL object from the blob object

  var url = URL.createObjectURL(blob);

  // Set the iframe src to the URL object

  iframe.src = url;

}

 

function postIframe(){

 var iframe = document.getElementById("html-frame");

 iframe.contentWindow.postMessage("Hi, Message From Parent Website", '*');

}

  </script>

</head>

<body>

  <h1>HTML Editor</h1>

  <p>Enter some HTML code in the textarea below and click the button to render it in the iframe.</p>

<textarea id="html-code" rows="10" cols="50">

        <h2>Hello World</h2>

        <p>This is a simple HTML document.</p>

</textarea>


<br>

<button onclick="renderHTML()">Render HTML</button>

<br>

<iframe id="html-frame" width="500" height="300"></iframe>

<br />

<button onclick="postIframe()">Post Iframe</button>

</body>

</html>


In case we want to communicate with iFrame, we can use of postMessage, for that we can add the following code into Html of iFrame

iFrame Html Content as below:


<!DOCTYPE html>

<html>

<head>

  <title>Page Title</title>

</head>

<body>

  <h1>This is a Heading</h1>

  <p>This is a paragraph.</p>

  <script type="text/javaScript">

     function addListener() {

       window.addEventListener('message', event => {

        // IMPORTANT: check the origin of the data!

        //if (event.origin === 'https://your-parent-site-url') {

        // The data was sent from your site.

        // Data sent with postMessage is stored in event.data:

        alert(event.data);

        //} else {

        // The data was NOT sent from your site!

        // Be careful! Do not use it. This else branch is

        // here just for clarity, you usually shouldn't need it.

        return;

        //}

      });

     }

    addListener();

   </script>

<div> Footer Content</div>

</body>

</html>

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