It is most common task which is
performed by using javaScript. We have likely come across forms on the web that
have shown us a prompt when we haven’t entered a value into a field that
requires one or when we have entered wrong kind of value, this is because the
form has been validated i.e., a script has checked to see whether the text we
have entered or choices we have made match. Some rules that the programmer has
written into the page.
Example:
<html>
<head>
<title>Form
validation</title>
<script
type=”text/javascript”>
Function validation()
{
var a= document.form.name.value;
var a= document.form.name.value;
Var
b = document.form.name_1.value;
If(a==””&& b==””)
{
alert(“ Enter your Name and password ”);
alert(“ Enter your Name and password ”);
}
Else if(b==””)
{
alert(“Enter your password”);
alert(“Enter your password”);
}
Else if(a==””)
{
alert(“Enter your Name);
alert(“Enter your Name);
}
Else
{
alert(“Form is filled successfully”);
alert(“Form is filled successfully”);
}
}
</script>
</head>
<body>
<form
name=”form” method=”post” onsubmit=”validation()”>
Name:<input
type=”text” name=”name”>
Password:<input
type=”password” name=”name_1”>
<input
type=”submit” value=”submit”>
</form>
</body>
</html>
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