Wednesday, December 27, 2006

Date Validation and Triming the spaces in Javascript

.NET Classes used :

Summary


This function uses to trim the whitespaces in the word.


/* Function to remove the leading & trailing spaces */
function Trim(strInput)
{
strInput = LTrim(strInput);
strInput = RTrim(strInput);
return strInput;
}

/* Function to remove the leading spaces */
function LTrim(strInput)
{
var intCntr;
for (intCntr=0; intCntr < strInput.length; intCntr++)
{
if (strInput.charAt(intCntr) != " ")
break;
}
return strInput.substr(intCntr, strInput.length);
}

/* Function to remove the trailing spaces */
function RTrim(strInput)
{
var intCntr;
for (intCntr=strInput.length-1; intCntr > -1; intCntr--)
{
if (strInput.charAt(intCntr) != " ")
break;
}
return strInput.substr(0, intCntr + 1);
}



Output : var strName = Trim("Senthil ");

To validate the date use this function





/* Function for validating the date
Declaring valid date character, minimum year and maximum year
*/
var dtCh= "/";
var dtCh1= "-";
var minYear=2000;
var maxYear=2050;
function isDate(dtStr)
{
var daysInMonth = DaysArray(12)
dtCh= "/";
dtCh1= "-";
if (dtStr.indexOf(dtCh)==-1)
{
if (dtStr.indexOf(dtCh1) == -1)
{
return false;
}
else
{
dtCh=dtCh1;
}
}
else
{
dtCh=dtCh;
}

var pos1=dtStr.indexOf(dtCh)
var pos2=dtStr.indexOf(dtCh,pos1+1)
var strMonth=dtStr.substring(0,pos1)
var strDay=dtStr.substring(pos1+1,pos2)
var strYear=dtStr.substring(pos2+1)
strYr=strYear
if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)

for (var i = 1; i <= 3; i++)
{
if (strYr.charAt(0)=="0" && strYr.length>1)
{
strYr=strYr.substring(1)
}
}
month=parseInt(strMonth)
day=parseInt(strDay)
year=parseInt(strYr)
if (pos1==-1 || pos2==-1)
{
return false
}
if (strMonth.length<1 || month<1 || month>12)
{
return false
}
if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month])
{
return false
}
if (strYear.length != 4 || year==0 || yearmaxYear)
{
return false
}
if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false)
{
return false
}
return true
}

/* Function to return the number of days in a month */
function DaysArray(n)
{
for (var i = 1; i <= n; i++)
{
this[i] = 31
if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
if (i==2) {this[i] = 29}
}
return this
}



/* Function to whether input parameter is a number or not */
function isInteger(s){
var i;
for (i = 0; i < s.length; i++){
/* Check that current character is number */
var c = s.charAt(i);
if (((c < "0") || (c > "9"))) return false;
}
/* All characters are numbers */
return true;
}



/* Search through string's characters one by one.
If character is not in bag, append to returnString
*/
function stripCharsInBag(s, bag)
{
var i;
var returnString = "";
for (i = 0; i < s.length; i++){
var c = s.charAt(i);
if (bag.indexOf(c) == -1) returnString += c;
}
return returnString;
}

/* February has 29 days in any year evenly divisible by four,
EXCEPT for centurial years which are not also divisible by 400.
*/
function daysInFebruary (year)
{
return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}




Output : alert(isDate(document.getElementById("tBDate").value));