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I want to trigger a javascript function when the time reaches, say, 3:00 PM.
The time will be assigned dynamically. So is there any javascript function to achieve that??
790
The setTimeout method allows us to run a function once after the interval of the time. Here we have defined a function to log something in the browser console after 2 seconds. const timerId = setTimeout(() => { console. log('Will be called after 2 seconds'); }, 2000);
The setInterval() function is commonly used to set a delay for functions that are executed again and again, such as animations. You can cancel the interval using clearInterval() . If you wish to have your function called once after the specified delay, use setTimeout() .
You just need to calculate the difference between the current time and the target time and use setTimeout() with that value.
For example, depending on how your target browsers parse dates, you could do the following:
function alert3pm() {
alert("It's 3PM!");
}
var timeAt3pm = new Date("1/31/2011 03:00:00 PM").getTime()
, timeNow = new Date().getTime()
, offsetMillis = timeAt3pm - timeNow;
setTimeout(alert3pm, offsetMillis);
Or rather, instead of parsing a date (since that's really inconsistent between browsers) you could do something like this:
function getTimeAtHour(hour) {
var t = new Date();
t.setHours(hour);
t.setMinutes(0);
t.setSeconds(0);
t.setMilliseconds(0);
return t;
}
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