validation

validation

View Answers

May 13, 2009 at 11:29 AM

Hi Friend,

We are providing you a javascript that will validate your required fields:

validation1.js
---------------

function isAlpha(argvalue) {
argvalue = argvalue.toString();
var validChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

for (var n = 0; n < argvalue.length; n++) {
if (validChars.indexOf(argvalue.substring(n, n+1)) == -1)
return false;
}
return true;
}
function isNumber(str){
if(/^-?\d+(\.\d+)?$/.test(form.marks.value)){
return true;
}
return false;
}
function isYear(str){
if(/^-?\d+(\.\d+)?$/.test(form.year.value)){
return true;
}
return false;
}
function validate(){
var fname=document.form.firstName.value;
var lname=document.form.lastName.value;
var mar=document.form.marks.value;
var y=document.form.year.value;
if (fname == ""){
alert("Please Enter First Name.");
form.firstName.focus();
return (false);
}
if(isAlpha(fname)==false){
alert("Please enter only characters.")
return false;
}
if (lname == ""){
alert("Please Enter Last Name.");
form.lastName.focus();
return (false);
}
if(isAlpha(lname)==false){
alert("Please enter only characters.")
return false;
}
if (mar == ""){
alert("Please enter only numbers.");
form.marks.focus();
return false;
}
if (isNumber(mar)==false){
form.marks.focus();
alert("Please Enter only numbers");
return false;
}
if (y == ""){
alert("Please enter the year.");
form.year.focus();
return false;
}
if ((isYear(y)==false)||(y<1990)||(y>2010)){
form.year.focus();
alert("Please enter valid Year");
return false;
}
alert("Welcome");
return true;

}
And here is your html file:
newForm.html
------------
<html>
<head>
<script src="validation1.js" type="text/javascript"></script>
</head>
<body>
<form name="form" method="post" onsubmit="return validate();">
<table>
<tr><td>Enter First Name:</td><td><input type="text" id="firstName"></td></tr>
<tr><td>Enter Last Name:</td><td><input type="text" id="lastName"></td></tr>
<tr><td>Enter Marks:</td><td><input type="text" name="marks"></td></tr>
<tr><td>Enter Year of Passing</td><td><input type="text" name="year"></td></tr>
<tr><td><input type="submit" value="valid"></td></tr>
</table>
</form>
</body>
</html>
Thanks

May 13, 2009 at 5:28 PM

Hi Friend,

Add one more thing to your javascript file i.e,

if ((mar<0)||(mar>100)){
alert("Invalid marks.");
form.marks.focus();
return false;
}

This will restrict the user to enter the marks between 1 and 100.

Thanks









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