[Coding] update time from every 1 second to scheduled time

kent79

updateLunarCal: function() {
		var url1 =  ..... ;
		var self = this;
		var nextLoad = this.config.updateInterval;
		
		fetch(url1)
			.then((resp) => resp.json())
			.then(function(data) {
				
				self.lunar = data.LunarDate ;				
				self.updateDom();
			})		

			.catch(function(error) {
				// If there is any error you will catch them here
			});		
			
		setTimeout(function() {
			self.updateLunarCal();
		}, 1000);

	},

I would like to change as above code of update time from every 1 second to scheduled time. For example: Everyday on 0:00. Please teach me. Thank you

sdetweil

@kent79 sadly there is no magic here… just grunt work…

you have to calculate the ms til 0:0:0

you can use the moment library (yes I know other folks its not the new library)

// Your moment
var now = moment();   // now

// Your moment at midnight
var Midnight = now.clone().startOf('day');  // 00:00:00 today earlier

// Difference in milliseconds
var milliseconds_passed_already = now.diff(Midnight, 'milliseconds'); // since 00:00:00
then subtract  
var milliseconds_til_midnight_tonight = (24*60*60*1000)-milliseconds_passed_already

kent79

@sdetweil

May be I explain it clearly.

I am developing a lunar calender module. As my above coding, it will connect to json server to get the lunar information ervery 1 second.

I would like to change it to connect server once on Everyday 00:00.

Since I am a beginner of coding, I don’t know how to do edit it. Please teach me. Thanks

kent79

updateLunarCal: function() {

		var url1 = "https://abc ....";
		var self = this;	
		
		fetch(url1)
			.then((resp) => resp.json())
			.then(function(data) {
				// Here you get the data to modify as you please
				self.lunar = data.LunarDate;							
				self.updateDom();
			})

			.catch(function(error) {
				// If there is any error you will catch them here
			});		
			
		setTimeout(function() {

			if (moment().hours() === 0 && moment().minutes() === 0 && moment().second() === 0) {

				self.updateLunarCal();

			}

			else{
				
			}
		}, 100);

I have revised as above code. Is it achieve my goal?

sdetweil

@kent79 well, it will work, BUT you make a check every 100 ms… so LOTS of wasted work… let the system work for you

fetchIt: function(self){
		var url1 = "https://abc ....";		
		
		fetch(url1)
			.then((resp) => resp.json())
			.then(function(data) {
				// Here you get the data to modify as you please
				self.lunar = data.LunarDate;							
				self.updateDom();
			})

			.catch(function(error) {
				// If there is any error you will catch them here
			});	
},

updateLunarCal: function() {

		let MS_in_day = 24*60*60*1000;
		let now = moment();
		let MS_til_midnight = MS_in_day - (now.diff(now.clone().startOf('day'), 'milliseconds')

			
		// start a one time timer to end of day
		setTimeout((selft) =>{
			
			//in one time timer(at  00:00:00), start interval for next start of day
			setInterval((selfi)=>{
				// fetch data, once per day at 00:00:00
				self.fetchIt(selfi) // use 'this' pointer passed to the interval routine
			},MS_in_day,
			  selft)  // pass 'this' pointer passed to us

			// fetch on the 1st start of day, one time
			self.fecthIt(selft)

		}, MS_til_midnight,
		   this );  // pass 'this' to the timer routine

		// fetch data now, 1st time
		this.fetchIt(this);
}

kent79

@sdetweil

	 updateLunarCal: function() {

		let MS_in_day = 24*60*60*1000;
		let now = moment();
		let MS_til_midnight = MS_in_day - (now.diff(now.clone().startOf('day'), 'milliseconds'));
			
		// start a one time timer to end of day
		setTimeout((selft) =>{
			
			//in one time timer(at  00:00:00), start interval for next start of day
			setInterval((selfi)=>{
				// fetch data, once per day at 00:00:00
				selfi.fetchIt(selfi) // use 'this' pointer passed to the interval routine
			},MS_in_day,
			  selft)  // pass 'this' pointer passed to us

			// fetch on the 1st start of day, one time
			selft.fecthIt(selft)

		}, MS_til_midnight,
		   this );  // pass 'this' to the timer routine

		// fetch data now, 1st time
		this.fetchIt(this);
	},

Thank you so much for your reply. I got error while running above function. There may be some syntax error. But I can’t fix it. Please help me again. Thanks

kent79

@sdetweil

It seems OK now. I will test it on tonight and will share it to all later. Thank you so much.

sdetweil

@kent79 error, yeh, sorry, forgot to change the self?.fetchIt() to use the right self pointer… fixed now

kent79

@sdetweil said in [Coding] update time from every 1 second to scheduled time:

@kent79 error, yeh, sorry, forgot to change the self?.fetchIt() to use the right self pointer… fixed now

Would you like to tell me which line need to update since I don’t know how to do? I have tested the above code, no syntax error, but no working while on 00:00. Thanks

sdetweil

@kent79 I updated my prior post