ChromeExtension/background.js at master · pjzzz/ChromeExtension · GitHub

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console.log('Background script running!!');

chrome.browserAction.onClicked.addListener(buttonClicked);
let extensionRun1 = 0;

function changeMode(tab) {
    let swtch = {
        turn: "on"
    };
    if (extensionRun1 % 2 === 1) {
        swtch.turn = "off";
    } else {
        swtch.turn = "on";
    }
    chrome.tabs.sendMessage(tab.id, swtch);
    if(swtch.turn === "on")
    {
        chrome.browserAction.setIcon({ path:'icons/icons8-eye-16.png'});
    }else
    {
        chrome.browserAction.setIcon({path:'icons/16.png'});
    }
    extensionRun1 += 1;
}

function buttonClicked(tab){
    console.log('icon clicked');
    changeMode(tab);
}

chrome.commands.onCommand.addListener(function (command) {
    if (command === 'toggle') {
        console.log(command,' command entered');
        chrome.tabs.query({ active: true, currentWindow: true }, function (tabs) {
            changeMode(tabs[0]);
        });
    }
});