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venkatesan

text field validation
1 Answer(s) 3 years and 11 months ago
Posted in : Java Beginners

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June 27, 2009 at 12:18 PM

Hi Friend,

Try the following code:

<%@page language="java"%>
<html>
<script language="javascript">
function isDecimal(str){
if(isNaN(str) || str.indexOf(".")<0){
alert("Invalid");
}else{
str=parseFloat(str);
alert ("Entered number is decimal")
}
}
function validate(){
var dec=document.form.num.value;
if (dec == ""){
alert("Please enter.");
form.num.focus();
return false;
}
if (isDecimal(dec)==false){
num="";
form.num.focus();
return false;
}
return true;
}

</script>
<form name="form" method="post" onsubmit="return validate();" >
Enter Decimal Number:<input type="text" name="num">
<input type="submit" value="Check" >
</form>
</html>

Hope that it will be helpful for you.

Thanks

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