我创建了 google chrome 的计时器和警报扩展。如果用户设置的时间(提醒时间)等于当前时间，则会发出警报。这可以正常工作，但前提是扩展程序打开。我想在扩展程序未打开时发出警报。
这是一个开放的扩展。仅当扩展打开时才触发警报。
这是我的 jquery 代码，它检查时间并根据条件触发警报。
window.setInterval(function(){
// Get/Display CurrentTime
$(document).ready(function(){
// Check If Time set
$("#RemindTime").text(localStorage.getItem("newtime"));
var RemindTime = localStorage.getItem("newtime");
RemindTime = RemindTime+":00";
var today = new Date();
var cHour = (today.getHours()<10?'0':'') + today.getHours();
var cMin = (today.getMinutes()<10?'0':'') + today.getMinutes();
var cSec = (today.getSeconds()<10?'0':'') + today.getSeconds();
var currentTime = cHour+ ":" + cMin + ":" +cSec;
$("#CurrentTime").text(currentTime);
// Tell If Time Passed Or Not
if(RemindTime == currentTime)
{
// Alert if set time is equal to current time
alert("Your reminder is in progress");
$("#status").text("Your reminder is in progress");
}
if(localStorage.getItem("newtime") < currentTime)
{
$("#status").text("Your reminder is over");
}
if(localStorage.getItem("newtime") > currentTime)
{
// Calculate Difference to be pass
var start = currentTime;
var end = localStorage.getItem("newtime");
s = start.split(':');
e = end.split(':');
min = e[1]-s[1];
hour_carry = 0;
if(min < 0){
min += 60;
hour_carry += 1;
}
hour = e[0]-s[0]-hour_carry;
diff = hour + ":" + min;
$("#status").text("Your reminder will execute after "+hour+" Hour and "+min+" Min.");
}
// Set New Reminder time for new reminder
$("#submit").click(function(){
if($("#newtime").val())
{
var newtime = $("#newtime").val();
localStorage.setItem("newtime", newtime+":00");
}
else
{
var newtime = currentTime;
localStorage.setItem("newtime", newtime);
}
$("#RemindTime").text(newtime);
});
});
}, 100);
HTML
<body>
<div class="container">
Current Time : <span id="CurrentTime"></span>
</div>
<div class="container">
Remind Time : <span id="RemindTime"></span>
</div>
<br><hr>
<div class="container">
<span id="status"></span>
</div>
<br><hr>
<div class="container">
Change Time : <input type="time" name="newtime" id = "newtime" />
<br>
<input type = "button" id="submit" value="Set Time"/>
</div>
</body>
manifest.json
{
"manifest_version": 2,
"name": "Remind Me :) ",
"description": "This extension shows a Simple Time Counter for slected time",
"version": "1.0",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"background": {
"scripts": ["popup.html"],
"persistent": false
},
"permissions": [
"activeTab",
"https://ajax.googleapis.com/"
]
}
最佳答案
使用 Event page (您已经有一个，但请参阅下面的第一点)和 alarms API :
为了清晰起见，我建议使用单独的背景页面文件
manifest.json
"background": { "scripts": ["eventPage.js"], "persistent": false }, "permissions": [ "alarms" ],popup.js 向事件页面发送消息:
// in 60 minutes chrome.runtime.sendMessage({name: "alarm 1", time: {delayInMinutes: 60}}); // in 1 minute chrome.runtime.sendMessage({name: "alarm 2", time: {when: Date.now() + 1 * 60e3}});eventPage.js:
chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse) { if (msg.time) { chrome.alarms.create(msg.name, msg.time); } }); chrome.alarms.onAlarm.addListener(function(alarm) { alert(alarm.name + " fired, wake up!"); });使用 notifications API 代替
alert()可能会更好
检查the samples您还可以在其中了解如何组织后台(事件)页面与扩展程序的其他部分之间的通信。
注意:发布 Chrome 扩展程序后，即使您设置较小的值(例如 5 秒(5000 毫秒))，实际间隔也会四舍五入为 1 分钟。
来源:https://developer.chrome.com/docs/extensions/reference/alarms/#method-create
In order to reduce the load on the user's machine, Chrome limits alarms to at most once every 1 minute but may delay them an arbitrary amount more. That is, setting
delayInMinutesorperiodInMinutesto less than 1 will not be honored and will cause a warning.whencan be set to less than 1 minute after"now"without warning but won't actually cause the alarm to fire for at least 1 minute.To help you debug your app or extension, when you've loaded it unpacked, there's no limit to how often the alarm can fire.
关于javascript - 谷歌浏览器扩展程序: Alert when Modal/popup closed，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31715840/