There is an excellent extension called Blipshot which takes page screenshots. I need to invoke the extension with page level javascript, instead of clicking its icon. Is thi
It would only be possible if the extension provides an interface to do it. Extensions run in an isolated environment, so you don't have direct access to any of their functions.
The closest they get is content scripts, which have access to the DOM. Because of that, you can communicate using events, but obviously the extension would need to set up event handlers for them, so it completely depends on the extension.
You cannot invoke any methods of an extension from within a web page. However, it's possible to inject a content script into the web page, and use sendMessage
and onMessage
, or onConnect
and connect
.
To edit an extension: Visit chrome://extensions
page, and enable the Developer mode. Unpack an extension and/or visit the extension's directory. Edit the manifest.json
file, and add the necessary lines (see here).
Add an event event listener at the background page. Add a poller in the content script, eg:
// Content script
var poller = window.setInterval(function() {
if (document.documentElement.getAttribute('extensionCalled')) {
chrome.extension.sendMessage({"anyname": "anything"}, function() {
/*optional callback function.*/alert("Something happened")
});
clearInterval(poller);
}
}, 200);
// Background
chrome.extension.onMessage.addListener(function(request, sender, callback) {
if (request.anyname == "anything") {
function_logic_here();
//Optionally, callback:
callback();
}
});
message
events).