alert for validation
i want to put alert on the text box that enter data should be in DD/MM/YYYY format only through javascript validation.
View Answers
May 7, 2012 at 12:40 PM
<html>
<script type='text/javascript'>
var dminyear = 1900;
var dmaxyear = 2200;
var sep= "/"
function checkNumber(str1){
var x;
for (x = 0; x < str1.length; x++){
var cr = str1.charAt(x);
if (((cr < "0") || (cr > "9")))
return false;
}
return true;
}
function getcharacters(s, sep){
var x;
var Stringreturn = "";
for (x = 0; x < s.length; x++){
var cr = s.charAt(x);
if (sep.indexOf(cr) == -1)
Stringreturn += cr;
}
return Stringreturn;
}
function checkFebruary(cyear)
{
return (((cyear % 4 == 0) && ( (!(cyear % 100 == 0)) || (cyear % 400 == 0))) ? 29 : 28 );
}
function finaldays(nr) {
for (var x = 1; x <= nr; x++) {
this[x] = 31
if (x==4 || x==6 || x==9 || x==11)
{
this[x] = 30}
if (x==2)
{
this[x] = 29}
}
return this
}
function dateValid(strdate)
{
var monthdays = finaldays(12)
var cpos1=strdate.indexOf(sep)
var cpos2=strdate.indexOf(sep,cpos1+1)
var daystr=strdate.substring(0,cpos1)
var monthstr=strdate.substring(cpos1+1,cpos2)
var yearstr=strdate.substring(cpos2+1)
strYr=yearstr
if (strdate.charAt(0)=="0" && strdate.length>1) strdatestrdate=strdate.substring(1)
if (monthstr.charAt(0)=="0" && monthstr.length>1) monthstrmonthstr=monthstr.substring(1)
for (var i = 1; i <= 3; i++) {
if (strYr.charAt(0)=="0" && strYr.length>1) strYrstrYr=strYr.substring(1)
}
pmonth=parseInt(monthstr)
pday=parseInt(daystr)
pyear=parseInt(strYr)
if (cpos1==-1 || cpos2==-1){
alert("The date format must be : dd/mm/yyyy")
return false
}
if (monthstr.length<1 || pmonth<1 || pmonth>12){
alert("Enter a valid month")
return false
}
if (daystr.length<1 || pday<1 || pday>31 || (pmonth==2 && pday>checkFebruary(pyear)) || pday > monthdays[pmonth]){
alert("Enter a valid day")
return false
}
if (yearstr.length != 4 || pyear==0 || pyear<dminyear || pyear>dmaxyear){
alert("Enter a valid 4 digit year between "+dminyear+" and "+dmaxyear)
return false
}
if (strdate.indexOf(sep,cpos2+1)!=-1 || checkNumber(getcharacters(strdate, sep))==false){
alert("Enter a valid date")
return false
}
return true
}
function validate(inputtxt)
{
var crdt=inputtxt.value
if (dateValid(crdt)==false)
{
document.form1.text1.focus()
return false;
}
return true;
}
</script>
<body onload='document.form1.text1.focus()'>
<form name="form1" action="#">
Enter a valid date [dd/mm/yyyy format] : <input type='text' name='text1'/>
<input type="submit" name="submit" value="Submit" onclick="validate(document.form1.text1)"/>
</form>
</body>
</html>
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