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alert for validation

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megha singhal
alert for validation
1 Answer(s)      5 years and 3 months ago
Posted in : JSP-Servlet

i want to put alert on the text box that enter data should be in DD/MM/YYYY format only through javascript validation.

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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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