I am working on a taskpane addin and a content addin for Powerpoint. I want to have the possibility to manipulate the content of the content addin through the taskpane addin, e.g. pushing a button in the taskpane addin to change an image or other web content in the content addin on the selected slide.
I can host both addins within the same React project, but I don't have the possibility to communicate between them in powerpoint to my knowledge.
If the two add-ins are both hosted on the exact same domain, you could try using LocalStorage as a go-between. Your task pane stores a signal in a specific key of LocalStorage. Your content add-in must be setup to periodically check that key for changes and then respond accordingly. I haven't tried this, but it might work.
This is a well-known and solved problem - you're looking for communication between windows or tabs.
Check out here: Communication between tabs or windows
In your apps, at the initialization part, you have to register the event listener for storage.
window.addEventListener('storage', () => {
console.log('your local storage has changed');
});
and based on the received event payload, you can manipulate data.
