I need to update a moment variable like
var moment = calendar.fullCalendar('getDate');
regularly by using setInterval function but that doesn't have any effect and the moment variable is always the same. Is there a method to have the current moment updated each X seconds ?
thanks,
Perhaps I've misunderstood, but it's not really clear why you want to use fullCalendar's getDate function. This will return the date currently selected in fullCalendar. Updating that every few seconds wouldn't be much use - it'll only change whenever the user selects a new date.
If you want to report the actual current time, you can do it easily using momentJS directly, something like this:
var m;
function currentTime() {
m = moment();
console.log(m.toISOString());
}
setInterval(currentTime, 1000);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script>
Related
In my project my scheduling to post in social network sites using cron job,
timestamp value should end with zero instead of 1.
here is the node js code used:
var rule = new cron.RecurrenceRule();
rule.second = 0;
cron.scheduleJob(rule, function(){
var now = new Date();
var date = dateFormat(now, "dd-mm-yyyy, h:MM:ss TT");
console.log(Math.floor(new Date()/ 1000));
retrivepost(Math.floor(new Date()/ 1000).toString());
});
here is the timestamp value output log which i get in terminal
1517894101
1517894161
1517894221
1517894281
1517894341
1517894401
1517894461
1517894521
1517894581
1517894641
1517894701
1517894761
1517894821
1517894881
1517894941
1517895001
1517895061
1517895121
For me your code works just fine and logs timestamps ending with the zero second just like scheduled.
However, I think if your retrievepost() function depends on a timestamp being on the minute exactly you should round your date inside the .scheduleJob function to the nearest minute. A whole second later seems odd to me but imagine that you have some code just above that takes a while to compute. retrievepost() will fail then, even if you get it working right now.
I know javascript is not the best way to go about this. I know that I would have to have the browser up and always running. I would normally do something with Python. This was a specific requests of me and i'm not very proficient with javascript. That being said.
I want the user to be able to set a time using inputs. Once these inputs have been set I want the browser to check for the time specified. Once the time occurs I want it to execute a command.
Her is what I have so far:
<html>
<body>
<p>Enter Time to start dashboard</p>
<p>Hour</p>
<input id="strthour">
<p>Minute</p>
<input id="strtmin">
<button onclick="setTime()">Submit</button>
<script>
var hr = 06; //default time of 6am to run
var mn = 00;
function setTime() {
hr = strthour.value;
mn = strtmin.value;
}
window.setInterval(function(){ // Set interval for checking
alert(hr+mn);
var date = new Date(); // Create a Date object to find out what time it is
if(date.getHours() === hr && date.getMinutes() === mn && date.getSeconds() === 0){ // Check the time
alert("it worked")
}
}, 5000); // Repeat every 60000 milliseconds (1 minute)
</script>
</body>
</html>
I am able to change the global variables, but I am unable to get window.setInterval to recognize the changes. Any advice?
Here is a link to a JSFiddle I made.
There are several issues with your code, which various people have pointed out.
Walker Randolph Smith correctly notes that date.GetHours() and date.getMinutes() will both return numbers, while the values returned from strthour.value and strtmin.value will be strings. When JavaScript compares these two, it will always evaluate to false. To fix this, try running the user input through parseInt, as in hr = parseInt(strthour.value, 10);. The 10 is important because it tells parseInt to create a number of base 10 (you don't need to know what that means, just make sure to include the 10).
Your need for the seconds to match is probably unnecessary, and does not match up with the interval you chose. TheMintyMate made this correction in their code snippet by simply removing the comparison for seconds. If you really need to make sure the seconds match up perfectly, pick an interval of less than 1000 milliseconds, so you know it is going to check at least once every second, guaranteeing that you will run the check on that 0th second of the desired time.
You could run into some trouble with single digit minutes if you try to compare them as strings, rather than converting to numbers as recommended in point 1. The .getMinutes() method will return a single digit 0 for a time like 6:00, while your example is implicitly prompting the user to enter in two digits for that same time. Again, you can avoid this issue entirely by using parseInt as recommended in point #1.
I do have to throw in a plug for using Cron jobs for running tasks on a known schedule like this. I know you said the user requested JS in this case, so they may not apply for this specific situation. Since you didn't mention Cron jobs though, I have to include them here to make sure you and future readers are aware of them, because they are designed for exactly this situation of running a task on an automated schedule.
Good luck!
You are not correctly referring to the inputs, and you also have a syntax error with your alert. Below is my suggested fix (working):
<p>Enter Time to start dashboard</p>
<p>Hour</p>
<input id="strthour">
<p>Minute</p>
<input id="strtmin">
<button onclick="setTime()">Submit</button>
<script>
var hr = 0;
var mn = 0;
function setTime() {
hr = parseInt(document.getElementById("strthour").value);
mn = parseInt(document.getElementById("strtmin").value);
console.log("set time: "+hr+":"+mn);
}
setInterval(function(){
var date = new Date();
if(date.getHours() == hr && date.getMinutes() == mn){ // using == not ===
alert("it worked");
}
}, 10000);
</script>
Note: You should also parseInt() the values to ensure they are valid numbers.
if(date.getHours() === hr && date.getMinutes() === mn && date.getSeconds() === 0){ // Check the time
alert("it worked")
}
This will compare a string to an int and always be false.
either perform parseInt(date.getHours()) or use ==
It's not because setInterval doesn't recognize the change, you actually don't modify the values.
If you open the javascript console on jsfiddle page you'll see "Uncaught ReferenceError: setTime is not defined".
It will work if you define you setTime like this:
window.setTime = function() {
hr = strthour.value;
mn = strtmin.value;
}
This is because JSFiddle doesn't run your code directly, but wraps into
<script type='text/javascript'>//<![CDATA[
window.onload=function(){
... // you code here }
}//]]>
Here is a modified JSFiddle which just "it worked" for me.
Update - some notes, as mentioned in other answers:
The use of '===' is also an issue, hr/mn are strings, so you need '==' or convert hr/mn to integers
Expression like strthour.value in setTime works in JSFiddle. I am not really sure why, but it works. In the "real world" it should be something like document.getElementById("strthour").value
Update 2 - why does strthour.value work (vs document.getElementById("strthour").value)?
This was actually a surprise for me, but it looks like all major browsers put all elements with id into window object. More than that, it is actually a part of the HTML standard (although it is not recommended to use this feature):
6.2.4 Named access on the Window object
window[name]
Returns the indicated element or collection of elements.
As a general rule, relying on this will lead to brittle code. Which IDs end up mapping to this API can vary over time, as new features are added to the Web platform, for example. Instead of this, use document.getElementById() or document.querySelector().
References:
HTML 5.1 - 6.2.4 Named access on the Window object
Do DOM tree elements with ids become global variables?
Why don't we just use element IDs as identifiers in JavaScript?
I think you should use ">=" operator, because you don't know if it's gonna be EXACTLY that time.
Is there a way to store the current timestamp in a Javascript variable? The reason is I want to compare Javascript's current time value with a Django time variable, and whenever the time matches, it will send a popup notification.
I guess reloading the page maybe every 3 seconds or so would work, but that seems extremely inefficient.
I'm not sure exactly what you're trying to do here. It's not likely the times will ever match exactly unless you check every millisecond, but you can always check when the time is greater than the django variable, or within a certain range. This will check the time every three seconds.
var django = // Create a javascript date object from django timestamp here
var interval = setInterval(function(){checkTime()}, 3000);
function checkTime() {
var d = new Date();
if (d >= django) {
//Do something here
clearInterval(interval);
}
}
I'm trying to get the time lapse between 2 diferent hours....
function time()
{
var startime=(document.getElementById("horaentrada").value);
var endtime=(document.getElementById("horasaida").value);
document.getElementById("total_horas").value = (endtime-startime);
}
the idea is to fill a html input "total_horas" with the result. The function is triggered by an onchange event. The entry format is "HH:mm:ss", by instance 9:35:22.
I've tried a lot of things, but, no one works I get NaN.
Try this:
function time()
{
var startime=(document.getElementById("horaentrada").value);
var endtime=(document.getElementById("horasaida").value);
document.getElementById("total_horas").value= (parseFloat(endtime,10)-parseFloat(startime, 10));
}
Also, make sure to run the function after the dom is loaded.
Fiddle: http://jsfiddle.net/LnLdB/2/ . Just be gentle with the stuff you input in the boxes.
EDIT: Here is an updated fiddle, using moment.js. It subtracts hours in the format "HH:mm:ss": http://jsfiddle.net/LnLdB/13/
I have a couple questions about javascript:
Does javascript have the capability to identify a filename with a timestamp as a name?
Similar to the Perl code below utilizing the POSIX module?
my $filepath = sprintf("/path/to/file%s.JSON",strftime("%y%m%d",localtime));
this is just an example. I would like to find file in format yy/mm/dd/hh/min
For example say I want to find a file with the name 12_11_03_15:15.json how can I do this with javascript.
Say I create a function that I want to trigger every 15 minutes to read the file how is this possible with javascript? I looked at setInterval() but that won't work because it is dependent on when the browser is launched. Is it possible to schedule a function to execute every hh:00, hh:15, hh:30, hh:45?
Thank you very much in advance.
You can use the Date class to get information about the current time.
To schedule a function to run at a certain time, setInterval() is indeed the best choice. It seems like what you're really looking for is a way to find out when to start the first interval such that it will fall on a quarter-hour. For that, you should again use Date to get the current time and subtract it from the next quarter-hour; you can use the resulting value with setTimeout to time the start of the first interval.
Here's an example: http://jsfiddle.net/GSF6C/3/
var nextQuarterHour = new Date();
nextQuarterHour.setMilliseconds(0);
nextQuarterHour.setSeconds(0);
do {
nextQuarterHour.setMinutes(nextQuarterHour.getMinutes() + 1);
} while (nextQuarterHour.getMinutes() % 15)
var millisecondsToNextQuarterHour = nextQuarterHour.getTime() - Date.now();
document.write(millisecondsToNextQuarterHour);
setTimeout(function () {
alert("Ding!");
setInterval(function () { alert("Dong!"); }, 15 * 60 * 1000);
}, millisecondsToNextQuarterHour);