Are you after something such as the following? where if no @ symbol is entered an error message will appear.
HTML Code:
<html>
<head>
<title> </title>
<script type="text/javascript">
function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
{alert(alerttxt);return false}
else {return true}
}
}
function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@")
if (apos<1)
{alert(alerttxt);return false}
else {return true}
}
}
function form_validate(thisform)
{
with (thisform)
{
if (validate_email(mail,"You have not entered a valid email address!")==false)
{mail.focus();return false}
}
}
</script>
</head>
<body>
<form action="valid_check.php"
onsubmit="return form_validate(this)"
method="post">
<table>
<tr>
<td>Email address:</td>
<td><input type="text" name="mail"></td>
</tr>
<tr>
<td> </td>
<td><input type="submit" value="Sign Up"></td>
</tr>
</table>
</form>
</form>
</body>
</html>
Or are you saying that if someone enters an @ symbol you want an error message to appear?
HTML Code:
<html>
<head>
<title> </title>
<script type="text/javascript">
function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
{alert(alerttxt);return false}
else {return true}
}
}
function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@")
if (apos>1)
{alert(alerttxt);return false}
else {return true}
}
}
function form_validate(thisform)
{
with (thisform)
{
if (validate_email(mail,"You have not entered a valid email address!")==false)
{mail.focus();return false}
}
}
</script>
</head>
<body>
<form action="valid_check.php"
onsubmit="return form_validate(this)"
method="post">
<table>
<tr>
<td>Email address:</td>
<td><input type="text" name="mail"></td>
</tr>
<tr>
<td> </td>
<td><input type="submit" value="Sign Up"></td>
</tr>
</table>
</form>
</form>
</body>
</html>