simple form validation

chiprivers · August 24, 2007

I not so good at javascript cos I dont use it very often so some help with this one would be much appreciated.

In a form I have two fields, one date and one time. When the form is submitted, I want to check that the date is submitted in the format 'dd/mm/yyyy' and that time is submitted as 'hhmm' (four digit number between 0000 and 2359). If either of these fields does not contain a valid entry then the form should not submit.

xenophobia · August 25, 2007

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language="javascript" type="text/javascript">
function valDate(dateinput)
{
var splitedDate = dateinput.split("/");
if(splitedDate.length != 3)
{
	return false;
}else{
	var the_day = splitedDate[0];
	var the_month = splitedDate[1];
	var the_year = splitedDate[2];

	if(the_day > 31 || the_day < 1)
	{
		return false;
	}else if(the_month > 12 || the_month < 1){
		return false;
	}else if(the_year < 1){
		return false;
	}

	return true;
}
}

function valTime(timeinput)
{
if(timeinput.length != 4)
	return false;

var thehour = timeinput.substring(0,2);
var theminute = timeinput.substring(2,4);

if(thehour > 23 || thehour < 0)
	return false;
if(theminute > 59 || theminute < 0)
	return false;

return true;
}

function validate()
{
var the_date = document.getElementById('txt_date').value;
var the_time = document.getElementById('txt_time').value;
if(valDate(the_date) && valTime(the_time))
{
	alert("Ok!");
}else{
	alert("Wrong date!");
}
}
</script>
</head>

<body>
<input type="text" id="txt_date" size="15" />
<input type="text" id="txt_time" size="15" />

<input type="button" value="Click Me" onClick="validate()" />
</body>
</html>

Copy paste the code above and try out. Hope it works!

Sign In

simple form validation

Recommended Posts

chiprivers

Link to comment

Share on other sites

xenophobia

Link to comment

Share on other sites

Archived

Browse

Activity

Important Information