Chrome extension: Send message from background script to *all* tabs

Question

Is there a way to have the background script inform all currently open tabs (i.e. their content scripts) that an event took place.

Something like the following basically

chrome.tabs.sendMessage("*", {foo: "bar"}) 

I suspect I could maintain a list of open tabs on the background script, if that's possible, and use that. But is there a simpler way?

Answer 1

The wildcard is not supported. The only way to reach all tabs is to query all existing tabs, and dispatch the message using chrome.tabs.sendMessage.

chrome.tabs.query({}, function(tabs) {     var message = {foo: bar};     for (var i=0; i<tabs.length; ++i) {         chrome.tabs.sendMessage(tabs[i].id, message);     } }); 

Answer 2

Taken from Rob W's example. This is probably a little better:

chrome.tabs.query({}, (tabs) => tabs.forEach( tab => chrome.tabs.sendMessage(tab.id, message) ) );