I have a tab change listener in background script which which will send a message to the content script to preform a set of actions in content script.
My code in background script is
window.chrome.tabs.onActivated.addListener((activeInfo) => {
window.chrome.tabs.sendMessage(activeInfo.tabId, { type: 'getLibraries' }, (data) => {
// do some thing
});
});
content script is
window.chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
switch (message.type) {
case 'getLibraries':
// do something
break;
default:
console.error('Unrecognised message: ', message);
}
});
This is working fine in most cases. When I add the extension to my browser and switch to a previously opened tab, the content script wont be present there as the plugin was not present while loading the tab. At this time the background scrip tries to send message on tab change. Since there is no content script chrome will throw the following error
Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist
I need a tab change detection in background script which will send a message to the content script without causing the above error. Is there any way to detect if the content script has loaded from background script?
