Validating a date with the onblur event.

[Excko]

Hello. I need to validate a date in a form using the onblur event. The date needs to be in the mm/dd/yy format.

Here is the code wich would call the function.

<input type=&quot;text&quot; name=&quot;txtDate&quot; onblur=&quot;return checkDate(this.form.txtDate.value)&quot;>


I have tried coding my own function to validate the date, but with no luck so far. I was wondering if I could get some help. It would be very appreciated.

Thank you

 

[mwolf00]

Have you tried a keyword search? Looked at the FAQs? This question is asked at least weekly...

I suggest searching on &quot;valid date regexp&quot; or something similar

Programming today is a race between software engineers striving to build better and bigger idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. - Rick Cook (No, I'm not Rick)

 

[Excko]

I've been looking at FAQs and doing searches on the net and tried to adapt different code to mine, but with no luck so far.

 

[mwolf00]

from faq216-567

function isLeap(year){
if(year % 400 == 0){
return true;
} else if((year % 4 == 0) && (year % 100 != 0)){
return true
} else return false;
};

function days_in(month, year){
if(month == 4 || month == 6 || month == 9 || month == 11){
return 30;
} else if(!isLeap(year) && month == 2){
return 28;
} else if(isLeap(year) && month == 2){
return 29;
} else return 31;
};

function checkDate(myItem){
var myArrayDate, myDay, myMonth, myYear, myString, myYearDigit;
myString = myItem.value + &quot;&quot;;
if (myString == &quot;&quot; || myString == &quot;mm/dd/yy&quot{
myItem.value = &quot;mm/dd/yy&quot;;
return true;
}
myArrayDate = myString.split(&quot;/&quot;

myDay = Math.round(parseFloat(myArrayDate[1]));
myMonth = Math.round(parseFloat(myArrayDate[0]));
myYear = Math.round(parseFloat(myArrayDate[2]));
myString = myYear + &quot;&quot;;
myYearDigit = myString.length;

if (isNaN(myDay) || isNaN(myMonth) || isNaN(myYear) || (myYear < 1) || (myDay < 1) || (myMonth < 1) || (myMonth > 12) || (myYearDigit != 2) || (myDay > days_in(myMonth, myYear))){
alert(&quot;Please check your Date format. (mm/dd/yy)&quot;
myItem.value = &quot;mm/dd/yy&quot;;
return true;
} else{
return false;
}
};


Programming today is a race between software engineers striving to build better and bigger idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. - Rick Cook (No, I'm not Rick)

 

[Excko]

Thank you very much. I appreciate it greatly. Everything works fine now

 

[kaht]

I know you've probably already got your answer, but I figure I'd post this as it is what I usually use, and it a fairly short script. This allows the users to type in the date in lots of different formats as well:
Jan 01, 2003
01/01/2003
2003/01/01
etc...
It also checks for valid leap years and all that good stuff.

function checkForDate(strPassed) {
   var newDate = new Date();
   newDate.setTime(Date.parse(strPassed));
   if (isNaN(parseFloat(newDate.getFullYear()))) {
      return (false);
   }
   return (true);
}

I know it's not mm/dd/yy format, but you could always put code inside the function to change it to that. And it wouldn't be much more than 3 or 4 lines of code.



-kaht