Switch up the CSS variable within an embedded iframe

I'm in a predicament with a specific issue. I am currently utilizing Angular to incorporate an Iframe. Let's imagine the angular app as A and the Iframe as B. B is being loaded within A. Within B, I have utilized CSS variables to define colors. In A, there is a color picker available. My goal is to apply the selected color from A's color picker onto the body of B. How can I go about changing the body color of B located inside an Iframe? To provide some context, think of WordPress's customize page. I aim to achieve something similar.

javascriptcssangularsass

Answer №1

Since you have not provided any code, I am responding with a solution using pure HTML and JavaScript.

Here is the content for frame B:

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <style type="text/css">
        :root{
                --the-color:red;
        }
    </style>
</head>
<body>
<div style="color:var(--the-color)">
        BBBB
</div>
</body>
</html>

Your JavaScript in frame A (parent):

    document.getElementById('fr1').contentWindow
   .document.documentElement.style.setProperty('--the-color','blue')

This will update the color from red to blue.

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