Javascript date validation on onkeyUp using the leap year functionality
I have this piece of code where i am trying to validate the jquery based Date of Birth Validation.
is there any JS function which also checks the full date if it falls in a leap year or not, i am trying this but it does seems to be working
date i tested is: 02/29/1920 - it is giving false (edited)
testing it like this:
problem i can't use any extra library like moment.js
the error is it is always giving me false when i try to validate with a full date
i am not sure at this point, if the error is happening on leap year or onchange issue
is there any JS function which also checks the full date if it falls in a leap year or not, i am trying this but it does seems to be working
function isValidDate(s) {
var bits = s.split('/');
var d = new Date(bits[2] + '/' + bits[1] + '/' + bits[0]);
return !!(d && (d.getMonth() + 1) == bits[1] && d.getDate() == Number(bits[0]));
}
date i tested is: 02/29/1920 - it is giving false (edited)
testing it like this:
function init_inputOnKeyUp(){
$('select[name="day"],select[name="year"]').off('change');
$('select[name="month"],select[name="day"],select[name="year"]').on('change', function(e) {
if (type == 'select') {
var newdate = $('select[name="month"]').val() + '/' + $('select[name="day"]').val() + '/' + $('select[name="year"]').val();
var results = isValidDate(newdate.toString());
console.log(results);
console.log(newdate.toString());
}
});
}
problem i can't use any extra library like moment.js
the error is it is always giving me false when i try to validate with a full date
i am not sure at this point, if the error is happening on leap year or onchange issue
This will give you whether the year is leap year or not
function leapYear(year)
{
return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}
Hi Gurpreet,
Here is an article checks whether a given year is a leap year in the Gregorian calendar with detailed explanation :
https://www.w3resource.com/javascript-exercises/javascript-basic-exercise-6.php
But the main problem in your code is in the undefined variable type, instead you could use the is() function to check the current element node name like :
Working Sample
Using the leap year function, the validation will return true just when the year is a leap, something like :
https://jsfiddle.net/z_acharki/s05kj6zw/
Here is an article checks whether a given year is a leap year in the Gregorian calendar with detailed explanation :
https://www.w3resource.com/javascript-exercises/javascript-basic-exercise-6.php
But the main problem in your code is in the undefined variable type, instead you could use the is() function to check the current element node name like :
if ($(this).is('select')) {
Working Sample
Using the leap year function, the validation will return true just when the year is a leap, something like :
https://jsfiddle.net/z_acharki/s05kj6zw/
CEO
CERTIFIED EXPERT
this function should return me true if good, it is returning "undefined"
function isValidDate(sDate) {
var dateformat = /^(0?[1-9]|[12][0-9]|3[01])[\/\-](0?[1-9]|1[012])[\/\-]\d{4}$/;
if (sDate.match(dateformat)) {
var seperator1 = sDate.split('/');
var seperator2 = sDate.split('-');
if (seperator1.length > 1) {
var splitdate = sDate.split('/');
} else if (seperator2.length > 1) {
var splitdate = sDate.split('-');
}
var dd = parseInt(splitdate[0]);
var mm = parseInt(splitdate[1]);
var yy = parseInt(splitdate[2]);
var ListofDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
if (mm == 1 || mm > 2) {
if (dd > ListofDays[mm - 1]) {
return false;
}
}
if (mm == 2) {
var lyear = false;
if ((!(yy % 4) && yy % 100) || !(yy % 400)) {
lyear = true;
}
if ((lyear == false) && (dd >= 29)) {
return false;
}
if ((lyear == true) && (dd > 29)) {
return false;
}
}
} else {
return false;
}
}
CERTIFIED EXPERT
and your function still returns false if i choose a seperate date from a select like 02/16/1960
I have adjusted your code a little bit, but the main issue was that you're not returning true in the valid date case so I have added `return true;` to your code.
https://jsfiddle.net/z_acharki/smoxpwg9/
https://jsfiddle.net/z_acharki/smoxpwg9/
I think your main problem comes from here :
You're setting the value of the month in dd and the value of day in mm should be :
According to the order you sets here :
var dd = parseInt(splitdate[0]);
var mm = parseInt(splitdate[1]);
var yy = parseInt(splitdate[2]);
You're setting the value of the month in dd and the value of day in mm should be :
var mm = parseInt(splitdate[0]);
var dd = parseInt(splitdate[1]);
var yy = parseInt(splitdate[2]);
According to the order you sets here :
var newdate = $('select[name="month"]').val() + '/' + $('select[name="day"]').val() + '/' + $('select[name="year"]').val();
CERTIFIED EXPERT
that might be the problem, i am not sure completely sure, but this is not validating properly, please make it work, if the change is required, please do
Thanks
Thanks