Gilks commented on issue #32357:
URL: https://github.com/apache/superset/issues/32357#issuecomment-2891785491
Sure. Just reiterating that this is a hack and @rusackas is correct that
injecting into an iframe is not a good idea. Put this in your
`superset_config.py`.
```
def inject_css_handler(app: Flask):
@app.after_request
def after_request(response):
if '/embedded/' in request.path and response.content_type and
response.content_type.startswith(
'text/html'):
css_handler = """
<script>
(function() {
let messagePort = null;
function handleMessage(event) {
console.log('CSS: Message received:', event.origin);
if (event.data && event.data.type ===
'__embedded_comms__') {
if (event.data.handshake === 'port transfer') {
console.log('CSS: Handshake received,
setting up port');
messagePort = event.ports[0];
messagePort.onmessage = handlePortMessage;
}
} else if (event.data &&
event.data.switchboardAction === 'emit') {
console.log('CSS: Switchboard action received');
if (event.data.method === 'customCss' &&
event.data.args && event.data.args.css) {
console.log('CSS: Applying styles:',
event.data.args.css);
const styleElement =
document.createElement('style');
styleElement.textContent =
event.data.args.css;
document.head.appendChild(styleElement);
console.log('CSS: Styles applied');
}
}
}
function handlePortMessage(event) {
console.log('CSS: Port message:',
JSON.stringify(event.data));
}
window.addEventListener('message', handleMessage, false);
console.log('CSS: Handler initialized');
})();
</script>
"""
response.direct_passthrough = False
content = response.get_data(as_text=True)
if '</body>' in content:
content = content.replace('</body>', f'{css_handler}</body>')
response.set_data(content)
return response
FLASK_APP_MUTATOR = inject_css_handler
```
As outlined above your client would simply do this:
```
const embeddedFrame = document.querySelector('iframe');
embeddedFrame.contentWindow.postMessage({
switchboardAction: 'emit',
method: 'customCss',
args: {
css: '.dashboard { background: blue !important; }'
}
}, '*');
```
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