DOB validation

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November 12th, 2012, 01:32 PM

atta_akbar

Registered User

Join Date: Nov 2012

Posts: 9

Time spent in forums: 2 h 41 m 28 sec
Reputation Power: 0

DOB validation

Hi, I am new member here and this is my first post.
I am having prob.
i want to validate user dob (only year) using java script.
1-else if age is less then 20 message should be "not enough"
2-else message should be "welcome".
But it show "welcome" message if field is empty. please check and help me.any help will be appreciated.

<html>
<head>
<title>
This is dob validation
</title>
<script language="javascript">
function dobvali()
{
var currentdate=new Date();
var yearonly=currentdate.getFullYear();
var usrdob=document.getElementById('dob').value;
var res=yearonly-usrdob;
if(res<20)
{
alert('not enough');
}
else
{
alert('welcome');
}
}
</script>
</head>
<body>
Enter DOB (DD/MM/YYYY):<input type="text" id="dob"/>
<input type="button" value="check" onClick="dobvali();"/>
</body>
</html>

November 12th, 2012, 01:53 PM

web_loone08

Contributing User

Join Date: Aug 2008

Posts: 599

Time spent in forums: 1 Week 1 Day 12 h 40 m
Reputation Power: 69

The code below will do what your asking for, but you should also check / validate the month and day too; to ensure 100% accurate "Client Side" Age Verification. Plus you should also validate the format of your DOB text field.

Code:

<html>
<head>
<title>
This is dob validation
</title>
<script type="text/javascript">
function dobvali()
{
var currentdate = new Date();
var yearonly = currentdate.getFullYear();
var usrdob = parseInt(document.getElementById('dob').value.split("/")[2]);
var res = yearonly - usrdob;
if (usrdob.toString() != "undefined" && usrdob.toString().length == 4) {
if(res<20)
{
alert('not enough');
}
else
{
alert('welcome');
}
}
else if (usrdob.toString() == "NaN") {
alert("Please Enter Numbers Only");
}
else {
alert("Please Enter Your Date of Birth");
}
}
</script>
</head>
<body>
Enter DOB (DD/MM/YYYY):<input type="text" id="dob" maxlength="10"/>
<input type="button" value="check" onClick="dobvali()"/>
</body>
</html>

Last edited by web_loone08 : November 12th, 2012 at 02:14 PM.

November 13th, 2012, 03:07 AM

atta_akbar

Registered User

Join Date: Nov 2012

Posts: 9

Time spent in forums: 2 h 41 m 28 sec
Reputation Power: 0

Ok brother i got it to some extent,please tell me what is the logic of using userdob="undefined" and userdob="NaN".
I mean to say when a text_field is said to be "undefined" and when said to be "NaN".
Also tell me how to find difference between two complete dates
that mean DD/MM/YYYY 00:00:00.

<html>
<head>
<title>
This is dob validation
</title>
<script language="javascript">
function dobvali()
{
var currentdate = new Date();
var yearonly = currentdate.getFullYear();
var usrdob = parseInt(document.getElementById('dob').value.split("/")[2]);
var res = yearonly - usrdob;
if (usrdob.toString() != "undefined" && usrdob.toString().length == 4) //userdob.toString() !='undefined' , please explain this.
{
if(res<20)
{
alert('not enough');
}
else
{
alert('welcome');
}
}
else if (usrdob.toString() == "NaN")//userdob.toString() ='NaN' , please explain this.
{
alert("Please Enter Numbers Only");
}
else {
alert("Please Enter Your Date of Birth");
}
}
</script>
</head>
<body>
Enter DOB (DD/MM/YYYY):<input type="text" id="dob" maxlength="10"/>
<input type="button" value="check" onClick="dobvali()"/>
</body>
</html>

November 13th, 2012, 08:01 PM

web_loone08

Contributing User

Join Date: Aug 2008

Posts: 599

Time spent in forums: 1 Week 1 Day 12 h 40 m
Reputation Power: 69

Quote:

Originally Posted by atta_akbar

When I declared the variable "usrdob"; I parsed it as an interger, so I could do math (as it was originally a string). When I validated the "usrdob" variable; I converted back from an integer to a string. If the "usrdob" variable does not exsist, then the "usrdob" is "undefined" and if the "usrdob" variable is anything other then a integer (like any other character on your keyboard); you get "NaN", because it was originally parsed as an integer.

Quote:

Originally Posted by atta_akbar

Also tell me how to find difference between two complete dates that mean DD/MM/YYYY 00:00:00.

Do it similar to the way I did the year. Split it up into two sections and validate each section; with a specific validation criteria. Just look @ how I did the year; try to do the month and day the same way. I wouldn't worry about the time; that is to specific of a DOB validation

- lol.

November 14th, 2012, 03:30 AM

atta_akbar

Registered User

Join Date: Nov 2012

Posts: 9

Time spent in forums: 2 h 41 m 28 sec
Reputation Power: 0

thank you so much brother for this help , God Bless you. now i have understood.

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