Question

我正在尝试开发类似于Google Chrome的约会提醒扩展程序。该扩展包含一个浏览器操作，当单击该操作时，将显示一个HTML页面，用户可在其中输入约会的详细信息。在约会开始时，警报应显示约会的名称。

此扩展程序确实有效，但仅在浏览器操作处于活动状态时才有效。如果关闭浏览器操作，则不会在指定时间弹出警报。我不明白导致这个问题的原因。

的manifest.json

{
    "manifest_version": 2,
    "name": "Appointment",
    "description": "",
    "version": "1.0",
    "background": {
        "scripts": [
            "js/jquery.js",
            "js/Utils.js",
            "js/Controller.js"
        ]
    },
    "permissions": [
        "storage",
        "alarms",
    ],
    "browser_action": {
        "default_icon": "icon-appointment.png",
        "default_popup": "popup.html"
    }
}

Controller.js

function loadAppointments(allAppointmentsLoadedCallback){


    chrome.storage.sync.get("test_appointments",function(items){
        allAppointments = [];
        if("test_appointments" in items){
            sAllAppointments = items["test_appointments"];
            allAppointments = JSON.parse(sAllAppointments);
        }

        allAppointmentsLoadedCallback(allAppointments);
    });
}



function getAppointmentScheduledAt(aUnixTime,appointmentFoundCallback){
    console.log('Finding Appointment for ',new Date(aUnixTime));
    loadAppointments(function(allAppointments){
        for(var i=0;i<allAppointments.length;i++){
            var anAppointment = allAppointments[i];
            var startTime = new Date(anAppointment.startTime).getTime();
            console.log('Start time is ',startTime,' and alarm time is',aUnixTime);
            if(startTime == aUnixTime){
                appointmentFoundCallback(anAppointment);
                return;
            }
        }
        appointmentFoundCallback(null);
    });
}

chrome.alarms.onAlarm.addListener(function(anAlarm){

    getAppointmentScheduledAt(anAlarm.scheduledTime,function(appointment){
        if(appointment){
            console.log('Found one'); 
            alert(appointment.title);
        }else{
            console.log('No appointment found.');
        }
    });
});

Answer 1

我假设你在弹出页面中调用了chrome.alarms.create。这会向弹出窗口的defaultView（window）注册警报。弹出窗口关闭时会被破坏。

您需要将警报注册到背景页面的视图：

chrome.runtime.getBackgroundPage(function(bg) {
  bg.chrome.alarms.create( ... );
});

Chrome扩展程序脚本仅在显示弹出窗口时运行

1 个答案: