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Date Validation using JavaScript

Posted by Praveen Kumar on February 23, 2008

There are 6 function

function isInteger(s){  
function stripCharsInBag(s, bag){
function daysInFebruary (year){
function DaysArray(n) {
function isDate(dtStr){
function ValidateForm(){

<html>
<head>
<script language = “Javascript”>
// Declaring valid date character, minimum year and maximum year
var dtCh= “/”;
var minYear=1900;
var maxYear=2100;
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;
}
function stripCharsInBag(s, bag){
 var i;
    var returnString = “”;
    // Search through string’s characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){  
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}
function daysInFebruary (year){
 // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
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 isDate(dtStr){
 var daysInMonth = DaysArray(12)
 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){
  alert(”The date format should be : mm/dd/yyyy”)
  return false
 }
 if (strMonth.length<1 || month<1 || month>12){
  alert(”Please enter a valid month”)
  return false
 }
 if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
  alert(”Please enter a valid day”)
  return false
 }
 if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
  alert(”Please enter a valid 4 digit year between “+minYear+” and “+maxYear)
  return false
 }
 if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
  alert(”Please enter a valid date”)
  return false
 }
return true
}
function ValidateForm(){
 var dt=document.frmSample.txtDate
 if (isDate(dt.value)==false){
  dt.focus()
  return false
 }
    return true
 }
</script>
</head>
<body>
<form name=”frmSample” method=”post” action=”” onSubmit=”return ValidateForm()”>
                <p>Enter a Date <font color=”#CC0000″><b>(mm/dd/yyyy)</b></font>
                  :
                  <input type=”text” name=”txtDate” maxlength=”10″ size=”15″>
                </p>
                <p>
                  <input type=”submit” name=”Submit” value=”Submit”>
                </p>
              </form>
</body>
</html>

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Validation with JavaScript

Posted by Praveen Kumar on February 14, 2008

Given by Sreekanth S Rameshaiah(MAHITI INFOTECH PVT LTD)

function MM_validateForm() { //v4.0
  if (document.getElementById){
    var i,p,q,nm,test,num,min,max,errors=”,args=MM_validateForm.arguments;
    for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=document.getElementById(args[i]);
      if (val) { nm=val.name; if ((val=val.value)!=”") {
        if (test.indexOf (‘isEmail’)!=-1) { p=val.indexOf(‘@’);
          if (p<1 || p==(val.length-1)) errors+=’- ‘+nm+’ must contain an e-mail address.\n’;
        } else if (test!=’R') { num = parseFloat(val);
          if (isNaN(val)) errors+=’- ‘+nm+’ must contain a number.\n’;
          if (test.indexOf(‘inRange’) != -1) { p=test.indexOf(‘:’);
            min=test.substring(8,p); max= test.substring(p+1);
            if (num<min || max<num) errors+=’- ‘+nm+’ must contain a number between ‘+min+’ and ‘+max+’.\n’;
      } } } else if (test.charAt(0) == ‘R’) errors += ‘- ‘+nm+’ is required.\n’; }
    } if (errors) alert(‘The following error(s) occurred:\n’+errors);
    document.MM_returnValue = (errors == ”);
} }

<body>
<form action=”abcd” method=”post”

onsubmit=”MM_validateForm(‘name’,”,’R',’age’,”,’RinRange1:99′,’phone’,”,’NisNum’,'email’,”,’RisEmail’);return

document.MM_returnValue”>
<input name=”name” type=”text” id=”name” />
<input name=”age” type=”text” id=”age” />
 <input name=”sex” type=”radio” value=”male” />
<input name=”phone” type=”text” id=”phone” />
<input name=”email” type=”text” id=”email” />
<input name=”agree” type=”checkbox” id=”email” value=”" />
<input name=”Submit” type=”submit” />
</form>
</body>

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