Discuss "date validation" in the JavaScript Programming forum.

todd2006 · #1 July 5th, 2008, 10:05 PM

Hi,

I have a textbox called insexpdate

I want the user to enter valid date format in mm/dd/yyyy format only

I call the function onblur event

Code:

function callinsexpdate()
{
var re = /^\d{1,2}\/\d{1,2}\/\d{4}$/; 
alert(re);
  if((document.frm1.insexpdate.value == "") && (!document.frm1.insexpdate.value.match(re)))
  { 
	  alert("Invalid date format"); 
	
	  return false;
  }



}

but the code is not working

any idea

todd

jmurrayhead · #2 July 6th, 2008, 08:52 AM

Try this function:

Code:

function checkdateformat(userinput){
var dateformat = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{4}$/
return dateformat.test(userinput) //returns true or false depending on userinput
}

The above function returns a boolean (True or False) value depending on if the date entered is in the correct format or not.

lewy · #3 July 6th, 2008, 11:34 AM

@jmh - that will work, but how do you know it's a correct date? It's more complicated than that

I could just type in 2/31/0000 and it will validate

In my opinion, giving users the ability to type in a date is a bad idea as they will make mistakes from time to time.

Rather than doing the validation this way, why don't you use a calendar picker.
There are plenty out there on the net.
Make sure the textbox holding the value is readonly

Then on the serverside, you can validate that it's a correct date (this because you just can't trust users)

Besides, it's a good programming practice to always validate input on the server.

jmurrayhead · #4 July 6th, 2008, 11:39 AM

I completely agree. Just answering the question that was asked. But, to take it one step further, as lewy stated, using a date picker which only allows selection of valid dates would be far better

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Discuss "date validation" in the JavaScript Programming forum.

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