Chrome浏览器在窗口聚焦时读取

Question

I am still fairly new at programing. I have played around with JavaScript before, but it is still tricky for me.

I got this great idea for an extension for Google Chrome- in the future it would be nice to port it into other browsers. For now I think Google Chrome would be the easiest way to develop for.

I investigated a little and finished the kitties tutorial on the extensions site .

From there it makes sense- easy for the most part, but my idea sounds impossible to me. Simply, the extension would automatically reload the browser when window is selected or focused on the screen. Saves time by not pressing Ctrl + R (PC), or Cmd + R (Mac), or reload button every time the developer checks an update on code.

I was reading through the API documentation and found the method chrome.browserAction.onClick , is there like chrome.browserAction.focused ? Is this idea even feasible?

I also have to take in consideration that Chrome is visited by multiple OS. I wonder if Mac OS, Linux, and Windows version need different JavaScript instruction to pull this off? This simple idea is overwhelming...

Thanks for input in advance :)

Answer 1

Sounds like you'll want to use chrome.windows.onFocusChanged :

Fired when the currently focused window changes. Will be chrome.windows.WINDOW_ID_NONE if all chrome windows have lost focus. Note: On some Linux window managers, WINDOW_ID_NONE will always be sent immediately preceding a switch from one chrome window to another.

Here's an example of how to reload a newly-focused window's active tab:

chrome.windows.onFocusChanged.addListener(function(windowId) {
    if (windowId != chrome.windows.WINDOW_ID_NONE) {
        chrome.tabs.query({ active:true, windowId:windowId }, function(tabs) {
            if (tabs.length == 1) {
                var tab = tabs[0];
                chrome.tabs.reload(tab.id);
            }
        });
    }
});

You'll also need to declare the tabs permission in your manifest.