CODEWITHSUNDEEP
jquery
Praful Bagai
Praful Bagai

Reputation: 17382

How to calculate the total weeks in a year in jQuery?

I want to print the week,year in HTML, ie 43,2013. Also when I press prev button it should print 42,2013 and on pressing next I should get 44,2013.

I'm able to do it for month,year ie October,2013 and getting next presvious months but unable to do it for week.

Here is my code for month. Kindly help me in writing the code for week.

function monthNav(nav) {

  if(nav == 'prev') {

    var newMonth = cur_dat.getMonth() - 1;
    var newYear = cur_dat.getFullYear();
    if(newMonth < 0) {
      newMonth = 11;
      newYear -= 1;
    }

    cur_dat.setMonth(newMonth);
    cur_dat.setFullYear(newYear);
    curMonthYear = month[newMonth] + ", " + newYear;
    $("#mNav").html(curMonthYear);


  } else {

    var newMonth = cur_dat.getMonth() + 1;
    var newYear = cur_dat.getFullYear();
    if(newMonth > 11) {
      newMonth = 0;
      newYear += 1;
    }

    if(newYear == curYear && newMonth > curMonth) {
      return false;
    }
    cur_dat.setMonth(newMonth);
    cur_dat.setFullYear(newYear);
    curMonthYear = month[newMonth] + ", " + newYear;
    document.getElementById('periodVal').value=curMonthYear;
    $("#mNav").html(curMonthYear);

  }

}

Upvotes: 0

Views: 1084

Answers (3)

Drew
Drew

Reputation: 1

I am able to get the desired results using the following. The key thing is to do the addition of the days and the division as two sep functions - otherwise I was getting crazy results.

    var weeksCount = function (year, month_number) {
        var firstOfMonth = new Date(year, month_number, 1);
        var day = firstOfMonth.getDay();
        var lastOfMonth = new Date(year, month_number + 1, 0);
        var lastDate = lastOfMonth.getDate();
        var result = day + lastDate;
        result = Math.ceil(result / 7);
        return result;
    };

Upvotes: 0

smulholland2
smulholland2

Reputation: 1163

rubyist's function worked fine for getting the date, just changed Math.ceil to Math.floor and it works fine. I took the liberty of cleaning your original code a little.

function weekNav(nav) {

//just create a +1 or -1 valued variable here so you dont
//have to write the same code over agian.
  if (nav == 'prev') {
    var state = -1;
  } else {
    var state = 1;
  }

  var d = new Date();
  var newWeek = cur_dat.getWeek(d) + state;
  var newYear = cur_dat.getFullYear() + state;

  if (newWeek < 0) {
    newWeek = 52;
    newYear -= 1;
  } else if (newWeek > 52) {
    newWeek = 0;
    newYear += 1;
  }
  //display to HTML like monthNav()
}
/* Editted this function to adjust for last few days of the year */
function getWeeks(d) {
  var first = new Date(d.getFullYear(),0,1);
  var dayms = 1000 * 60 * 60 * 24;
  var numday = ((d - first)/dayms);
  var getDay = (numday + first.getDay()+1 )/ 7;
  var weeks = Math.round(getDay);     
  if ((numday+first.getDay()+1/7) > 365) {
    weeks++;
  }
  return weeks;
}

Upvotes: 0

LHH
LHH

Reputation: 3323

Try this - 

function getWeeks(d) {
 var first = new Date(d.getFullYear(),0,1); //start of the year
 var dayms = 1000 * 60 * 60 * 24;
 var numday = ((d - first)/dayms)
 var weeks = Math.ceil((numday + first.getDay()+1) / 7) ; 
 return weeks
}
alert(getWeeks(new Date("1 Dec 2012"))); //end of the year

and check your code here http://jsbin.com/ugesex/29/edit

Upvotes: 1

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