javascript - jQuery time display with AJAX requests -


i'm building webpage retrieves data server using ajax. i'm looking display time in div (in hours/minutes/seconds, 10:45:30, leading zeroes). 1 of ajax calls run infrequently; 45 minutes or between each call. call in question gets json string server's current time (via php). i'm able string hours, minutes, , seconds separated or 1 item.

i've seen lot of timer functions use setinterval , js functions current time; these operate client-side/locally. i've seen functions ask server's time every minute (which seems frequent).

what grab server's time ajax call (which can assign variables; part have figured out)., , let timer function use variables call starting point increment seconds, minutes, etc.

here's idea of may like; first, ajax call gets time variables.

function asktime(){         $.ajax({                 url: "servertime.php",                 datatype: "json",                 cache: false,                 success: function(data) {                     timehours = (data.timehours);                     timeminutes = (data.timeminutes);                     timeseconds = (data.timeseconds);                     timerfunction();                  },             });     }

and on success of call, run function display time in div of id, $('#timedisplay).html(timestring) .

so, shortly: how can use jquery display time using infrequent ajax calls server time?

gettime web method set on server side returns json encoded date time (something /date(milliseconds)/).

you might want change part of javascript (the first line in success callback) depending on how you date time web service.

    var clienttimeupdater = null;      function asktime() {         $.ajax({             type: "post",             url: "webform1.aspx/gettime",             contenttype: "application/json; charset=utf-8",             datatype: "json",             success: function (msg) {                 var servernowgettime = msg.d.replace(/\/date\(/, '').replace(/\)\//, '');                 var offset = (new date()).gettime() - servernowgettime;                 clearinterval(clienttimeupdater)                  // client side updater                 clienttimeupdater = setinterval(function () {                     var servernowgettime = new date((new date()) - offset);                     var hh = ('0' + servernowgettime.gethours()).slice(-2);                     var mm = ('0' + servernowgettime.getminutes()).slice(-2);                     var ss = ('0' + servernowgettime.getseconds()).slice(-2);                     $("#mytime").text(hh + ':' + mm + ':' + ss);                 }, 1000);             }         });     }      $(document).ready(function () {         // first call         asktime();         // call every 45 minutes         setinterval(asktime, 2700000);     })

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