date validation

[pradeepjain]

<script language = "Javascript">
/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// 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>
 

this is the javascript i am using ..it works properly but if there is a apace at beginning or at last of date it gives "Please enter a valid 4 digit year" which is correct but my client wants the space to be ignored and no msg to be dispalyed ..how to do it..

Thanks,
Pradeep

[Delerna]

use the ltrim function (Use google for specifics)
Change

function ValidateForm(){
 
//this
var dt=document.frmSample.txtDate
 
 
 
if (isDate(dt.value)==false){
dt.focus()
return false
}
return true
}

to something like

var dt=ltrim(document.frmSample.txtDate);
 

.....

[pradeepjain]

use the ltrim function (Use google for specifics)
Change
function ValidateForm(){

//this
var dt=document.frm Sample.txtDate



if (isDate(dt.valu e)==false){
dt.focus()
return false
}
return true
}






to something like
var dt=ltrim(docume nt.frmSample.tx tDate);


.....

if i use it it escapes the space but the javascript doesnot work only..how to correct it;

[Delerna]

sorry what i gave you is not java syntax, it is vb/sql syntax

try dt.value.replac e(" ","")

this replaces all the spaces with an empty string

[pradeepjain]

sorry what i gave you is not java syntax, it is vb/sql syntax

try dt.value.replac e(" ","")

this replaces all the spaces with an empty string

function ValidateForm(){
var dt=document.frmSample.txtDate
if (isDate( dt.value.replace(" ","") )==false){
dt.focus()
return false
}
return true
}

hey look i have put ur code in the function near the isDate calling function but not working.....any other idea....

Thanks,
Pradeep

[pradeepjain]

function ValidateForm(){
var dt=document.frmSample.txtDate
if (isDate( dt.value.replace(" ","") )==false){
dt.focus()
return false
}
return true
}

hey look i have put ur code in the function near the isDate calling function but not working.....any other idea....

Thanks,
Pradeep

Really srry its working but only for a single space not for multiple spaces ..how to do tht..

[Delerna]

did you notice that there are no closing semicolons in your isDate function?
is the code making it into the isDate function and then failing or is it failing at the isDate function call?

[gits]

hi ...

you could use the following function:

function trim_value(val) {
    var re = /\s/g;
 
    return val.replace(re, '');
}
 

then in your validate-function call:

var dt = trim_value(document.frmSample.txtDate);

kind regards

[pradeepjain]

hii Thanks for every ones help..
i finally used this

function trim_value(val) {
var re = /\s/g;
return val.replace(re, '');
}

function validatestring( ){
var dt=document.veh icleform.Date
if (isDate(trim_va lue(dt.value))= =false){
dt.focus()
return false
}
return true
}


and it is working fine..Thanks Delerna and gits


Thanks,
pradeep