Chrome extension: How to remember previous previous Tab? -


i made extension remembers previous tab , on button click toggles between current tab , previous tab. want extend remember previous previous tab. allow toggle between 2 tabs once current tab closed. however, struggling code logics. code toggle between current , previous tab:

var previoustab; var currenttab;  // switch tab on button click chrome.browseraction.onclicked.addlistener(function(tab) {     chrome.tabs.update(previoustab, {selected: true}); });  // update variables on tab change chrome.tabs.onselectionchanged.addlistener(function(tab) {     if (previoustab == null) {         previoustab = tab;     }     if (currenttab == null) {         currenttab = tab;     }     else {         previoustab = currenttab;         currenttab = tab;     } });

now code toggle between 2 tabs once current tab closed:

var previoustab; var previousprevioustab; var currenttab;  // switch tab on button click chrome.browseraction.onclicked.addlistener(function(tab) {     chrome.tabs.update(previoustab, {selected: true}); });  // update variables on tab change chrome.tabs.onselectionchanged.addlistener(function(tab) {     if (previoustab == null) {         previoustab = tab;     }     if (currenttab == null) {         currenttab = tab;     }     if (previousprevioustab == null) {         previousprevioustab = tab;     }     else {         previousprevioustab = previoustab;         previoustab = currenttab;         currenttab = tab;     } });  // update variables on tab removal chrome.tabs.onremoved.addlistener(function(tab) {     previoustab = previousprevioustab; });

something logic must wrong. when open 2 new tabs , close recent one, clicking on toggle button raises error tabs.update: no tab id: 698.

here idea: create tabs objects array (you can tabs objects calling chrome.windows.getall(). add property each tab object called "recent_use". set '0' selected tab.

anytime, tab selected, set "recent_use" 0. add '1' other tab's "recent_use". way, on time, nice order of tab focused recently.

then depending on how many keystrokes users hits (you have define own key strokes here), change tab focus tab has "recent_use" equal number of times user has hit keystroke. way, solution more generic previous , previousprevious tab.

(btw, have take care of modifying tabs array anytime new tab created or closed. can adding callbacks events)

in way, implementation of lfu - http://en.wikipedia.org/wiki/least_frequently_used


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