Question

I am trying to send Mouse Event to my Offscreen Tab and I received following error:

Error during experimental.offscreenTabs.sendMouseEvent:
 Invalid or unexpected MouseEvent object

My Code:

chrome.experimental.offscreenTabs.sendMouseEvent(tab.id, {
    "type": "click",
    "altKey": false,
    "ctrlKey": false,
    "shiftKey": false
}, {
    "x": 10,
    "y": 10
}, function () {
    console.log("Mouse Event Sent");
});

Any Suggestions?

Answer 1

You need to add a button key as well if you use a mouse event.

{
    "type": "click",
    "button": 1,      // 0 = left, 1 = middle, 2 = right
    "altKey": false,
    "ctrlKey": false,
    "shiftKey": false
}

Since the API is experimental, and the documentation is not quite complete, I looked in the source code:

• chromium/src/chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_api.cc (implementation of the offscreenTabs API)
• chromium/src/third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h (for definitions of the “button” constants).

PS. I managed to get a Developer tools instance when I used button: 2. Quite useful for debugging interaction with an offscreen tab!