CODEWITHSUNDEEP
google-chromegoogle-chrome-extension
chrom3r
chrom3r

Reputation: 31

Chrome extension: how do I change my icon on tab focus?

I want to be able to change the icon of my extension according to what site I am currently browsing. How can I listen for changes in tab focus?

Upvotes: 3

Views: 5491

Answers (2)

rgbflawed
rgbflawed

Reputation: 2157

I think I've figured this one out. You need two listeners. One to sense when the tab has been changed, one to sense when it's been updated. And then they both can trigger the same function too run. Here's what would be in the background file...

function changeIcon() {
    //query the information on the active tab
    chrome.tabs.query({active: true}, function(tab){
        //pull the url from that information
        var url=tab[0].url;
        //do whatever you need to do with the URL
        //alert(url);
        //change the icon
        chrome.browserAction.setIcon({path: 'pathToIcon'});
    });
}

//listen for new tab to be activated
chrome.tabs.onActivated.addListener(function(activeInfo) {
    changeIcon();
});

//listen for current tab to be changed
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
    changeIcon();
});

Upvotes: 4

Wladimir Palant
Wladimir Palant

Reputation: 57681

Simply register for tab update notifications in your background page:

chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab)
{
    if (changeInfo.status == "loading")
    {
        var url = tab.url;
        var iconPath = ???
        chrome.pageAction.setIcon({tabId: tabId, path: iconPath});
    }
});

This handler will be called whenever a tab changes location. You don't need to care which tab is currently selected because you will have defined a different icon for each tab. Still, if you want to do it - http://code.google.com/chrome/extensions/tabs.html#event-onSelectionChanged is the way to go.

Upvotes: 0

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