I have a problem, what i cant solve yet. I have a popup page with a menu, and tabs, and there is a settings tab. On settings tab, i save some item to localstorage, one of them is notification_time for a desktop notification.
Note : i have no options page!
My extension has this popup window and a background page, its function is to alert user with a desktop notification. I show notification in every 5,10,30 minutes, 1,2 hours etc. And this time should be chooseable on popup pages's options menu. The problem is, if 5 minutes is saved, and when i update to 10 minutes for example, than background.html is not updating himself! I rewrited code almost 20 times, but couldnt find solution. Heres a code sample,and a printscreen to get clear about my problem.
popup :
$("#save_settings").click(function(){
var bgp = chrome.extension.getBackgroundPage();
localStorage.setItem("notifynumber",$("#notifynumber").val());
if($("#notify").attr('checked')){
localStorage.setItem('chbox','true');
} else {
localStorage.setItem('chbox','false');
}
if($("#notif_time_select :selected").val()!="default"){
bgp.setTime(parseInt($("#notif_time_select :selected").val()));
}
if($("#org_select :selected").val()!="default"){
localStorage.setItem('org',$("#org_select :selected").val().replace(/%20/g," "));
}
});
Note : save_settings is a button, on the tab there is a checkbox (if checked then notifications are allowed, else diabled). There are two html select tags, one for choosing some data (org = organisation), and one, for selecting time. "#notif_time_select"
is the html select tag, where i choose 5,10,30 minutes etc...
So, whenever i click save button, i save checkbox state to localstorage,and i call one function from background page, to save time. : bgp.setTime(parseInt($("#notif_time_select :selected").val()));
background page:
for saving time i use function setTime:
var time = 300000; // default
function setTime(time){
this.time=time;
console.log("time set to: "+this.time);
}
after, i use setInterval to show notification periodically
setInterval(function(){
howmanyOnline("notify",function(data){
if(data>localStorage.getItem("notifynumber")){
if (!window.webkitNotifications) { // check browser support
alert('Sorry , your browser does not support desktop notifications.');
}
notifyUser(data); // create the notification
}
if(localStorage.getItem('tweet')=='true'){
if(data>localStorage.getItem("notifynumber")){
sendTweet(data,localStorage.getItem('org'),localStorage.getItem('ck'),localStorage.getItem('cs'),localStorage.getItem('at'),localStorage.getItem('ats'));
}
}
});
},time);
The code inside setInterval works fine, the only problem is,that
},time);
is not updating well. If i change settings to show notifications in every 10 minutes, it stays on 5 minute. The only way is to restart the whole extension. How could i update setInterval's frequency without restarting the whole extension? Thanks Jim
What if i save notif_time to localStorage too, and in background, i set up a listener, to listen for localStorage changes. Is there a way to listen for a particular localStorage item changes?!
Right now, setInterval
only runs once, when your application loads. If you want intervals to fire at a new time interval, you should use clearInterval
and then make a new call to setInterval
.
// set a new time, wipe out the old interval, and set a new interval
function setTime(t) {
window.time = t;
clearInterval(notifInterval);
notifInterval = setInterval(makeNotification, time);
}
// set first interval
notifInterval = setInterval(makeNotification, time);
function makeNotification() {
// do what you need to make a notification
}
Here, notifInterval
is a reference to the interval, returned by setInterval
, that is used to clear it.
The source code in your question is not completed, but I guess you called setInterval() and then modified window.time in the background page.
Your window.time is not an object but a number value, and setInterval() can't "see" changes of window.time after invocation.
Try this:
function onTimeout() {
// do your notification.
setTimeout(onTimeout, time);
}
setTimeout(onTimeout, time);
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