So here's what I'm trying to do - I have the following code:
<div id="on">
<p>We are: <span class="onair">ON AIR</span></p>
</div>
<div id="off">
<p>We are: <span class="offair">OFF AIR</span></p>
</div>
And what I'd like to do is "show" the "on" div on Tuesday's from 3pm to 4pm (server time), while simultaneously hiding the "off" div - and then switch that around for every other date/time.
?
If you use PHP you can do logic statements on the server-side to render the exact information you need instead of calculating it later on the client side.
(Client side solutions work too if you dont care about where the time is coming from)
(1) You can have the server render javascript for you that you can use in a script
//if you want the server's time you can do this:
<?php $timestamp = time(); ?>
//render variables in javascript instead of html
<?php
echo <<<EOD
<script>
var timestamp = ${timestamp}
//then later in your javascript process the timestamp logic to update the dom
</script>
EOD;
?>
(2) You can also have the server render a className in the body tag based on whether or not a condition is true or false. (This is my preferred method usually)
//onAirClass( min, max, timestamp ) returns className
//this function returns onair or offair class if the timestamp is in range
function onAirClass( timeMin, timeMax, timestamp ){
if( timestamp >= timeMin && timestamp <= timeMax ){
return 'onair';
}
return 'offair'
}
//using onAirClass( min, max, timestamp )
<?php $bodyClass = $bodyClass . ' ' . onAirClass( $timestamp ); ?>
<?php echo "<body class='${bodyClass}'>"; ?>
then in your styles you can have the elements you want to hide or show based on class inheritance from the body tag.
Check out the PHP time function to create new time strings, and do time calculations for your onAirClass() function
How to check the time between a given time range
UPDATED
Corrected PHP syntax errors
#maerics solution is OK, depending on what you want to do, just don't EVER do anything like this:
var timestamp = $('#server-timestamp').text();
Ultimately, there are many ways to do the same thing, but some things are more 'right' than others.
There are reasons to do some calculations on the client side vs the server side, and vice versa. As a newbie developer, just make sure that whatever method you use:
is simple
is efficient (doesnt do anything unnecessary or redundant)
falls in line with best practices
Actually this can be accomplished using just JavaScript without any server-side code, by using your timezone offset.
Here's a function you can use:
var onAir = function (day, start, end, timezone) {
var local, utc, show, days, onAir, startValues, endValues, startTime, endTime, startMinutes, endMinutes, showMinutes;
// by default, we are not on air
onAir = false;
// map day numbers to indexes
days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Firday', 'Saturday'];
// convert start/end times to date objects
startValues = start.split(':');
endValues = end.split(':');
startTime = new Date();
endTime = new Date();
startTime.setHours(startValues[0], startValues[1]);
endTime.setHours(endValues[0], endValues[1]);
// add the hours minutes together to get total minutes
startMinutes = (startTime.getHours() * 60) + startTime.getMinutes();
endMinutes = (endTime.getHours() * 60) + endTime.getMinutes();
// get the current local time
local = new Date();
// get the current time in the show's timezone
utc = local.getTime() + (local.getTimezoneOffset() * 60000);
show = new Date(utc + (3600000*timezone));
// convert the show hours + minutes to just minutes
showMinutes = (show.getHours() * 60) + show.getMinutes();
// test to see if the show is going on right now
if (days[show.getDay()] === day && (showMinutes >= startMinutes && showMinutes <= endMinutes)) {
onAir = true;
}
return onAir;
}
// example: Air time is Tuesday between 1-2pm Central Time (-6)
var texasShowOnAir = onAir('Tuesday', '13:00', '14:00', '-6'));
// now check if we are on air
if (texasShowOnAir) {
// do stuff here...
}
You can now use this function like this:
var check = onAir('DAY', 'STARTTIME', 'ENDTIME', 'YOURTIMEZONE');
This will return a true/false. Be sure and use 24 hour format.
I would even argue that this is better than using your server's timestamp, because often (especially if you have shared hosting), your server can be set in a different timezone than you.
Here's a demo fiddle: http://jsfiddle.net/stevenschobert/mv54B/
Have the server provide a timestamp when it generates the page and have the client also generate a timestamp when it loads the page so that you can calculate the time offset between the two systems.
Then you can call a function on some interval that checks the current server time to see if it is within the 3pm-4pm period and show/hide the target elements as needed.
From the server:
<div id="server-timestamp" style="display:none">2013-02-12T18:01:19Z</div>
On the client:
$(document).on('load', function() {
var serverTime = new Date($('#server-timestamp').text())
, clientTime = new Date()
, offsetMilliseconds = (clientTime - serverTime);
setInterval(function() {
// If server time is 3pm-4pm then hide/show divs...
}, 1000 /* every second */);
});
Related
I am displaying a calendar server side with php. Now I would like to scroll the months with 2 buttons (<< / >>) without reloading the whole page. There are loads of questions and examples, and I found some very close around forms, however, I have not really understood how to adapt this to a button.
A very simple script to pass the request new data is
<script>
$(document).ready(function(){
$("moveCal").click(function(){
$("#calendar").load("/presentation/cal.php");
});
});
</script>
A previous attempt of the php to request another month looked like this
echo '<span onclick="updateCal(\''.$toMonth->format('mY').'\')">';
echo '<span class="calendar_month_link"> '.$toMonth->format('M').' ></span></span>';
But how do I connect the updateCal() function with $(document).ready(function(){?
And another thing I am a bit confused about: If I am not working with a session id stored in a cookie, the application server still serves only the requesting IP with the requested date, right? Other simultaneous users can select other dates to be shown?
You may want more detail, but here's the gist of it:
A user visits a webpage and the address points to a PHP file- the PHP file runs on the server. It runs once per request, so the output will only be served to the requestor. If the file is static, or if it always produces the same HTML output- it'll be the same for everyone.
In your case, it sounds like you want at least a month variable, maybe a year variable too. When a request comes in with a variable (like $('#calendar').load('/presentation/cal.php?month=10&year=2021')) you can use the variable value to change the output. Since the variable is from the request, the output will be specific to the passed variables- thus every user on the site can send a different request and all see unique output.
In the above example, the month and year are passed via GET (i.e. they're appended to the URL as opposed to being in a form or passed via POST AJAX like $.post('cal.php', {month: 10, year: 2021}, function(responseData) { /*...*/ });).
PHP in turn has the $_GET and $_POST arrays to hold parameters passed via GET and POST methods respectively. So in the PHP file being requested (cal.php) you could use $_GET['month'] and $_GET['year'] to access the requested month and year. You would want to check if they exist in the request, and if not, use a default. If they are in the request, you'll want to verify that they're legitimate values, and if not, resort to the defaults (or deliver the user an error message).
So the pseudo-code might look something like:
cal.php
<?php
$defaultMonth = date("n");
$defaultYear = date("Y");
$month = isset($_GET['month']) ? $_GET['month'] : $defaultMonth;
/* check that $month is 1 - 12 [or whatever format you're expecting] and if not, set it to $defaultMonth instead, same thing for year */
$year = isset($_GET['year']) ? $_GET['year'] : $defaultYear;
/* query your database for events occurring in month $month and year $year */
/* echo out your calendar HTML with the included events from the requested month/year */
?>
index.php:
<div id='calendar'></div>
<script src='/path/to/jquery.js'></script>
<script>
var defaultMonth = <?php echo date("n") ?>;
var defaultYear = <?php echo date("Y") ?>;
var currentMonth = defaultMonth;
var currentYear = defaultYear;
function UpdateCal() {
$('#calendar').load('cal.php?month=' + currentMonth + '&year=' + currentYear);
}
function NextMonth() {
currentMonth += 1;
if(currentMonth == 13) {
currentMonth = 1;
currentYear += 1;
}
UpdateCal();
}
function PrevMonth() {
currentMonth -= 1;
if(currentMonth == 0) {
currentMonth = 12;
currentYear -= 1;
}
UpdateCal();
}
</script>
I would like to print the time in local time in Laravel. If the user create a post it will display the created time on the server. How can I display it in local time ?
In my blade file I used this code to display created time,
{{{ $posts->updated_at }}}
Which displays the time in database, which is a server time. How can I convert it to users local time ?
I found a solution to convert time to local time by using session. The current time zone offset will store on session to calculate users time. Create a jquery post function to post users timezone offset to session. This is my code,
default.blade.php
#if($current_time_zone=Session::get('current_time_zone'))#endif
<input type="hidden" id="hd_current_time_zone" value="{{{$current_time_zone}}}">
// For assigning session value to hidden field.
<script type="text/javascript">
$(document).ready(function(){
if($('#hd_current_time_zone').val() ==""){ // Check for hidden field is empty. if is it empty only execute the post function
var current_date = new Date();
curent_zone = -current_date.getTimezoneOffset() * 60;
var token = "{{csrf_token()}}";
$.ajax({
method: "POST",
url: "{{URL::to('ajax/set_current_time_zone/')}}",
data: { '_token':token, curent_zone: curent_zone }
}).done(function( data ){
});
}
});
routes.php
Route::post('ajax/set_current_time_zone', array('as' => 'ajaxsetcurrenttimezone','uses' => 'HomeController#setCurrentTimeZone'));
HomeController.php
public function setCurrentTimeZone(){ //To set the current timezone offset in session
$input = Input::all();
if(!empty($input)){
$current_time_zone = Input::get('curent_zone');
Session::put('current_time_zone', $current_time_zone);
}
}
Helpers/helper.php
function niceShort($attr) {
if(Session::has('current_time_zone')){
$current_time_zone = Session::get('current_time_zone');
$utc = strtotime($attr)-date('Z'); // Convert the time zone to GMT 0. If the server time is what ever no problem.
$attr = $utc+$current_time_zone; // Convert the time to local time
$attr = date("Y-m-d H:i:s", $attr);
}
return attr;
}
index.blade.php
{{ niceShort($posts->updated_at) }}
Now we can print the time in clients time zone. The time zone setting code run only when the session empty.
You can do this by using javascript. Use following libraries:
moment.min.js (http://momentjs.com/downloads/moment.js)
moment-timezone-with-data.js ()
jstz.min.js (https://bitbucket.org/pellepim/jstimezonedetect)
Here is the code :
var update_at = '<?php echo $posts->updated_at;?>'; //set js variable for updated_at
var serverTimezone = 'YOUR SERVER TIME ZONE'; //set js variable for server timezone
var momentJsTimeObj = moment.tz(update_at, serverTimezone); //create moment js time object for server time
var localTimeZone = jstz.determine(); //this will fetch user's timezone
var localTime = momentJsTimeObj.clone().tz(localTimeZone.name()).format(); //convert server time to local time of user
Now you can display local time through js
Try this method, I think this is what you want:
$localTime = $object->created_at->timezone($this->auth->user()->timezone);
Here, $this->auth->user()->timezone will return current user's timezone, and timezone() will convert created_at to to user's local time.
If you want to get all visitors timezone (not just logged in users), you can you package for Laravel similar to laravel-geoip. It will generate $visitor['timezone'] for you which you can use like this:
$localTime = $object->created_at->timezone($visitor['timezone']);
Best option is to do this with Javascript, get client's timezone and then convert server time to cleint's accordingly.
Please refer https://stackoverflow.com/a/1837243/4007628
Try this:
$dt = new DateTime($posts->updated_at);
$tz = new DateTimeZone('Asia/Kolkata'); // or whatever zone you're after
$dt->setTimezone($tz);
echo $dt->format('Y-m-d H:i:s');
Go to app.php page in Config folder and change this
'timezone' => 'UTC',
to
'timezone' => 'addYourTimeZoneHere',
reference
https://laravel.com/docs/5.5/configuration
find your timezone
http://php.net/manual/en/timezones.php
Server time should stick with UTC timezone
In front end, you can use moment.js to render the correct local timezone. I tested this in moment version 2.22.2.
Simply add Z to the datetime value and moment will render the date to user's local time zone
moment(dateTimeValue + ' Z');
Comment the timezone settings in app.php page
//'timezone' => 'UTC',
I use wordpress and I have static number for a field which is taken from sql query.
<p class="counter-number">843</p>
I would like to increase that number everyday. For example when the page is loaded default number is 843 next day it should show 844 the day after it should show 845.
How can I do this? I prefer PHP but if it is possible also can use jquery.
<?php
$now = time();
$your_date = strtotime("2010-01-01"); //Starting date
$datediff = floor(($now - $your_date)/(60*60*24));
?>
<p class="counter-number"><?=$datediff?></p>
Code taken from Finding the number of days between two dates
This way it will always show the difference from the starting date to now, in days.
jQuery Answer
You will have to setup the starting date for it to increase daily. The idea is to get the date difference and add it to that counter.
HTML
<p class="counter-number">843</p>
jQuery
jQuery(function() {
// Get Starting Number
var starting_number = parseInt(jQuery('.counter-number').text());
// Create Day difference (because it increases by 1 each day)
var preset_start_date = new Date("21/03/2015");
var current_date = new Date();
var timeDiff = Math.abs(current_date.getTime() - preset_start_date.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
var final_counter = starting_number + diffDays;
jQuery('.counter-number').text(final_counter);
});
I haven't tested it. But this is an idea to get that done.
For your case here are two ways achieve the goal.
use php
//client site php_cnt.html
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>visit_cnt</title>
</head>
<script type="text/javascript"src="http://localhost/php_cnt.php">
</script>
</html>
//server site php_cnt.php
<?php
//Here is the some logic to process the visit count
$visit_cnt = 11; // assume read it from mysql
echo "document.write($visit_cnt);";
?>
use javascript/jquery
//client site php_cnt.html
$(function() {
$.get('http://localhost/php_cnt.php',{r:Math.random()},function(cnt) {
$('. counter-number').html(cnt);
});
});
//the server site code
<?php
//Here is the some logic to process the visit count
$visit_cnt = 11; // assume read it from mysql
echo visit_cnt;
?>
Hope this can help you !
I want to use flipclock for the reverse counter. The timer should start from hh:mm:ss (eg, 19:40:46) to 00:00:00.
Below is the code
var clock;
$(document).ready(function() {
// Grab the current date
var currentDate = new Date();
// Set some date in the future. In this case, it's always Jan 1
var futureDate = new Date(currentDate.getFullYear() + 1, 0, 1);
// Calculate the difference in seconds between the future and current date
var diff = futureDate.getTime() / 1000 - currentDate.getTime() / 1000;
// Instantiate a coutdown FlipClock
clock = $('.dw_clock').FlipClock(diff, {
clockFace: 'DailyCounter',
countdown: true,
showSeconds: true
});
});
I don't want the date. Also, the time values should get fetched from MySQL and are different for different users when they log in. From PHP-MySQL, I have:
function timeToPlay(&$smarty){
$sqlStr = "select timediff('24:00:00', time(taken_on)) as timeRemaining,
hour(timediff('24:00:00', time(taken_on))) as hour,
minute(timediff('24:00:00', time(taken_on))) as minute,
second(timediff('24:00:00', time(taken_on))) as second
FROM profile_sicc_exer_score where user_id=".$_SESSION['user_id']."
order by id desc limit 1";
$sqlQuery = mysql_query($sqlStr) or die(mysql_error()."<hr>".$sqlStr);
if ( mysql_num_rows($sqlQuery) ) {
$timeToPlayNext = mysql_fetch_assoc($sqlQuery);
$smarty->assign("timeRemaining",$timeToPlayNext['timeRemaining']);
$smarty->assign("hour",$timeToPlayNext['hour']);
$smarty->assign("minute",$timeToPlayNext['minute']);
$smarty->assign("second",$timeToPlayNext['second']);
}
}
From the above code, I get the values of (example)
$timeRemaining = 19:40:46
$hour = 19
$minute = 40
$second = 46
How do I use the values in the above Flipclock code which is javascript/jquery...
For flipClock, you have to change the clockFace to "HourlyCounter", so it doesn't show the date.
After that, having the php variables, you can "echo" them into the javascript code, for example, at the end of the webpage, you can put:
<script>
clock.setTime(<?php echo $hour*3600+$minute*60+$second; ?>);
</script>
You can always put it in an "onload" function or something like that, but it should work fine with that.
You didn't left any details about the actual html page where the counter is showing, so I can't help you further this.
Good luck!
I have a quiz page with some questions (multiple choice, true-false). In the results after the submit of page i want to show something like this:
Started on Tuesday, 1 January 2013, 04:09 AM
Completed on Tuesday, 1 January 2013, 04:10 AM
Time taken 47 secs
Grade 7 out of a maximum of 10 (65%)
i dont know how to count start time and end time to show the above results and how to count the time from when user's load a page until they submit the form.
i'm new and i need your advise. i dont have problem if the problem solved with php or javascript or jquery
You can do something like this and the start and end timestamps will be submitted along with the form. You could then do the calculations with PHP.
var form = document.getElementById("form");
window.onload = function() {
var start = document.createElement("input");
start.type = "hidden";
start.name = "start";
start.value = +new Date()/1000; //unix timestamp
form.appendChild(start);
};
form.onsubmit = function() {
var stop = document.createElement("input");
stop.type = "hidden";
stop.name = "stop";
stop.value = +new Date()/1000;
form.appendChild(stop);
};
Ok here is my solution:
1- user starts the quiz and you put the time in $_SESSION var
$_SESSION['quiztime']=date("Y-m-d H:i:s");
2-User finishes the test and you check the time passed (this example is in minutes you don't have to divide it by 60 if you need seconds)
$to_time = strtotime(date("Y-m-d H:i:s"));
$from_time = strtotime($_SESSION['quiztime']);
echo round(abs($to_time - $from_time) / 60,2). " minutes";
I'd put the time started in a cookie or session, and then once they complete it, just subtract that time from the current time -- That's the time taken!
It may look like this:
Quiz page:
session_start();
$_SESSION['startTime'] = time();
// This is where the quiz would be displayed
Quiz results page:
session_start();
$totalTime = time() - $_SESSION['startTime'];
echo $totalTime;
My "bullet-proofer" solution would be to store the start time on the server, (in the session) associated with a unique id generated per-form and kept in an hidden field.
This way you prevent the user from tampering with it (he might change the unique id, but in that case the form would be invalid) and you don't depend on the client having javascript enabled.
<?php
$form_uuid = uniqid();
$_SESSION['quiz_start_time'][$form_uuid] = time();
Then, in your form, put something like this:
<input type="hidden" name="form_id" value="<?php print $form_uuid; ?>">
And in the form submit handler:
<?php
$form_uuid = $_POST['form_id'];
if (!isset($_SESSION['quiz_start_time'][$form_uuid])) {
// The user is trying to do something nasty (or the session just expired)
// Return something like a 400 error
}
else {
$start_time = $_SESSION['quiz_start_time'][$form_uuid];
// Do other form processing here..
}